This regulation repealed as on 08.06.2023-- Central Electricity Authority (Measures relating to Safety & Electric Supply) Regulations, 2010

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Jrs I w ~-l l f,,,,, ,! ~ t ~ Ii i ~ . l j ; ' I i ~ i; i; ~i · j 11'i if ii, !1fr 1~' i i~ ~-l o r- ii i ~ ~ I i I 1 ~ . 1 ~ -~ i '!& i .J i i w~ 'i fi 1! ~! i &! r~ wi~& I?! ~I Ii I J i$ E li E ~i g ~J slf ~f 70 TI-IE GAZETTE OF INDIA : EXTRAORDINARY [PART I!i-SEC. 4] ~ ",:g; "ITT1T I ~it~ ",:g; ~ ~ m,'r; lR- ~w; _ll- (<s!) ~~1'<1$"'5 316@T ~-~· ~ ~I .~~~<16~<'11'J,'ltt!lT'TT I ~~~~I wt '!ITT; I ~ fcpm ~ I . . ~~~~~cfRlt.~ I - ammrx '1cf5<fi % I 'l'lfTf I ~ I 4½~ Tl 71 Tiffi GAZETTE OF INDIA : EXTRAORDINARY [PART lll-SEC. 4) ~ ~~trn ~ dil>.fl~ill'11 cfi ~ 4 ~ 5~ 4~ Qlcffiili'l dc/J.fl~ill'11 cfi ~ 2½~ 2½ ~ 2½~ 2½ wan; 2½ wan; 2½~ 2½~ 2½~ (•r) ~~~ e.~11 · 16~ 8~ 16~ '!~iq-,'1 ~ III (11) ~x~4e~11 (en) (<ll) ~x~4e~11 80 TIIE GAZETTE OF rNDIA : EXTRAORDINARY [PART III~SEC. 4] ~- IV 1½~ ~I . r ~-v ~-VI 2½~ II 82 1HE GAZETTE OF INDIA : EXTRAORDINARY [PART III-SEC. 4] 11P1 D I "'1'fRT~ II III Rl,al'u I • . (viii) ~ ~aml ~I t:<1,;-W"1'1 ~ ~I ~/di'i('l'i-sfi I (i) ~ 'ml> [ '11'1 m-= 4 l ~I XXI ~. i3'oq <114'11'1, ~ I (xiii) ~ <lit ~ <lT"1"'1T I I II III 145½ "ER; 11T'T· III 'fW!R[~, (i) fcIB!~~ (iii) 'lTT'IB # '3<"11<';"1 ~ 88 DIE GAZETTE OF INDL.\. : EXTRAORDINARY [PART III-SEC. 4] ' C 3747 Gl/10-12 ~~ <ll~'l!'<l'H I ~110 "ER 92 1HE GAZETTE OF INDIA : EXTRAORDINARY [PART Ill-'----Soc. 4] (i) fuattc5 ~I ~I ~ i;iJeq,ti1 I I . ffil!RI ~: 3 (i) fcwf~~ (iii) 'lfl'IB'l~~ ~ ~ ~ 00 ~ I V Tffi (i) (iii) ll,'Rf$.R 94 THE GAZETTE OFINDIA: EXTRAORDINARY if>F4ifil~ fuzjo : (~3!R) I [P';"r III-----SEC. 4] Fci~t:1<11,i I · lfGl3tl<I< I ~~I "ll<il'R I WiRl"~---aNmil;m I ~ "ilT<IW ~-~-~ I 96 TIIE GAZETTE OF INDIA : EXTRAORDINARY ~llm'c~~AA'<fi""WPR I (ix) ~~~~~ I ~~<lit~~-' ,' ;;:, . [PART ill-SEC. 4] W1<1>.~I (i) ~-~$1, 1 ~ ~ I 140 1ft =4½~ I ~' ~ THE GAZETTE OF INDIA : EXTRAORDINARY VII ~ ,r,iq;r ~ , I . (1) ~~ I· VIII (iii) ~ tic 3tR ~ I [PART JI_l-SEc .. 4] X ~ll"'3"'lcfil~ I . l,IR\fa,41 I 175 ci-e i) mix~~ (iii) ti'l~~ · (iv) ~ ~ ~ +IT'R~~ I ~~-~I 61 tR um, =2~ iw-r VII I w m ~ ~, ~I >fl1f'1cf~ I ~cRfci\il, I . >1RIRh<11 I =2½~ . i) ~~~ 104 THE GAZETTE OF fNDIA : EXTRAORDINARY [PART Ill-SEC. 4] 1llll- VIII I. IL III. IV. V. VI. ~qlf ~· "' ~ I 1!i r--.... r-- ['11'1 Ill-= 4]. II. (iii.) c;J'<i'1~1c'< (iii.) c;J'<-1>-i~lc'< 106 rnE GAZETTE OF INDIA : EXTRAORDiNARY [PART III--SEc. 4] VIII. qcfi!!qc,..\. =~= "'~= 2 XL XII. XIII. XIV. xv. -=-<:•=••.;o-~- oJlqNcficil I ( i. ) ~ fcrcRur ffil ii' I !08 TIIE GAZETTE OF INI)IA : EXTRAORDINARY [PART lll-SEC. 4] XIV. xv. XVI. XVII. XVIII. XIX. xx. (i.) ~ tj•.\lfolf~ . I. II. III. IV. v. ~lq~4q,dl I (iii.) ~~~je:ifi'14j VIII. 00 ~ : (i.) ~~ ~•-s™'' -- -•--•r ~ -- - JIO TIIE GAZETTE OF INDIA : EXTRAORDINARY (iii.) ~~ :tftd61'1 ~ (vii.) (jcfGlt;ie ~~ c,,1;re'!;a "it,f-mft" lj'ffi'lliil I J aftx ~i!lllliiil ~ - 140 'ER." 11l1l- XII V. ,jj/qNcf,cil I (i.) xW!Rf~ (iii.) ~10'f;JJR"~(crfc~~~ '{1,!l)GM I Ill [PART III-SEC. 4) t I m:- 'ff. I. II. III. IV. V. VI. VII. VIII. IX. X. XI. XII. XIII. XIV. xv. XVI. I 1lfll- XIII -6!j9<ll111 ~q,f~.~ ~. '11.\he:~'11 3747 Gl/10-15 =(2½~) ll3 TIIE GAZETTE OF INDIA : EXTRAORDINARY 11'Pl· XIV a!:!Sl4) •! I III. IV. v. VI. VJ[. VIII. IX. x. XI. XII. XII[. XIV. xv. XVI. ~,ii~,@•1<$~ i3 I. II. III. IV. v. VJ. VII, VIII. IX. x. XI. XII. XIII. XIV. xv. XVI. XVII. XVIII. XIX. xx. m W<'f-74<R =(2½~) iwr- XVI I: II. III. IV. '1~'11e<, 4w cliitlcffi <ll!.IT ~ s ~-68tf-e: 1lPT- XVII I. lva~-1 ~I ll8 TIIB GAZETTE OF INDIA : EXTRAORDINARY . [PART Ill-SEC. 4] (i.) ~~~. (i.) ~3ITttMal!IT~ (iii.) q\dlj'!'ct'l ~ (vii.) 'l<l'G!ft\d ~~ (iii.) !li0r..l•i ~ ~ s g/\:i~•I ffil Tfl ~~I 120 THE GAZETI'E OF· INDIA : EXTRAORDINARY . [PART 111-SEC. 4] 1l11T- XVIII I ~ I , (vii.) ~ f.lmur'l (i.) ~qf<'if- (iii.) ~ wll,$<1i (iv.)~ ~I ¥1-74 "ER = (2½ 3747 Gl/10-16 122 TIIE GAZEITfrOF INDJA : EXTRAORDINARY [PART IIF---SEC. 4] 'l{lll- XIX I ~I 2 3 ~•'3J!M,H lO ~-t'."1011'~ (iii.) ~itl4ill1'< m-;t (iii.) c;Jti4lcx (iii.) ~iti4kx 124 THE _GAZETTE OF INDIA : EXTRAORDINARY [PART III--SEC. 4) Oii.) <;_it14k'I .VIII. 'lcfyJ'lc'I : {,,4~-&I <Te-=(2 [ '11'1 m~~ 4 J 1flll- XXI I 1'fG I I i. II . III. IV. v. VI. ~~"q;f~ I ~&if.1'31~ 126 THE GAZETTE OFJNJ;)IA.: EXTRAORDINARY (viii.) Jfcl;rrd1!1T~~ (xiL) ~ [PART III-SEC. 4] atj.!1<1) 111 ~Wfl ~- XXII I "ff. I. I 2 (i.) ex~ll!'i (iii.) 11qf.PT)PJJ@t (iv.) "!fflife. ~ (vii.)~ 9011~<11 cpf™ IV. V. VI. VII. VIII. IX. x. XI. XII. ~ 42 '1ft 1flll· XXIII I~ I , IL (i.) ~. [ '11'1 IIl-""16 4]. W<'f80<R (i) tlc'TT ~ ~ (iii) ~~ 3747 Gl/10-17 W<'f 48 <R I (i) ~~~ (iii) ~ "If ~ ti·~ (viii) ~ffi1l1111 ~ I ~1%<Jc0 ifim IX X XI XII (iii) (iv) (i) (ii) (iii) (iv) r c11,;RR•1 ~ XIII XIV xv XVI ~ cnm- #br (iv) ~ ~~$@ [PART lll-'--SEC. 4) XVII 3!ffi.T- 3 XVIII ~:- 3 XIX ~- 10 xx XXI XXII XXIII XXIV XXV XXVI XXVII XXVIII XXIX XXX. XXXI XXXII Tc1190 cR 1lT'T' XXVI I ~ ~- I I "flT'!R[~ 6 (iii) "'31!-<R '<f<I"'[ II '34%'< III IV C V VI VII VIII (iii) ;511i;t1'16te, (vi) ~~ '51 q <.>1'1 cli'l (iii) ~~ [PART Ill-SEC. 4] ~a,ur i . '- ql; ~ (i.) f.r-;fi ~ <11!1! ~ XI (xiv.) '"'3IT ~ 'lWT- XXVII it~ ................................................. ; ............................ . ~- 3lQ; ~~3il<~ .B== +(5) 'l,<"'l i <1>'1 ~ ajq, + 100 [PART III-SEC. 4] 3lQ; 51%'ff cfilf (3) ~ ~: ....................... "ff (~) .......•...... : ......• I 3747 Gl/10-18 ~. ······················•··········· ~ ·························· ....... m· (•·1lt) ;f,.~ ··········································································"·'· . ;~ ............. •.••••n.••• .... ••••••••••·••••••••u .. ••••••• .. • .. • .. •• .. ••• .. •"••••••••"•••• -.~ ' '"t!\l' t ~t am; 140 THE GAZETIE OF}~IDIA , ~ORDINARY ~ ~ -~" ,.a;;q . [.-'ART ffi--SEC. 4] 1!PT· I ~~N'T I I t I - i I I~ I 2 I (i.). ffiqq,· ~ ·~ am fll~4cil~. ~. ~. ~ ~ ~ ~ ~ ~f/lWr ~ I ~I 'fm?I I ~ il<f'! ~ I '}llfqG!T ~ I Fcl~<i1<1•1. & ~ ~. ·.~ ~ I 1TT'@T ~ I (xii.) ~-,:r. '1t. it. (~ ~· "'<filRlJT W'ITRI) I ¥PIT I · 144 THE GAZETTE OF INDIA : EXTRAORDINARY (q,) ~~ ~~.j (Tf)~~~ [PART lll-SEC. 4] tlii<-1 cfi i <it "I "ct\~ I 3747 Gl/10-,.." (viii.) ~ ~ - ~/WmWf (xi.)~~ - ·~ ~ i(2)·.~ ---(L~·~• ~1&;14e1~, .... [PART III-SEC. 4] V. >WR: 12 .(~am) ffiti;-, ~-~ 207 We cc7~ 148 THE G.AZETTE OF INDIA : EXTRAORDINARY 'c/5l<l . [PART IJ[:-SEC, 4] (c/5) i,q-~ ~· 'lfT'T· III ~<Ffl~i4-i1 ~ ~ Qidolibll I 'ffi'lRI~: II (i).'3'1:1-'iR (~) '3'1:1-~ 33 ~ "ff 765 ~ ('ti) ~~ ------------- --~-c.:c - ---~~ V ~~: VI ~: VIII (1) W&lT (iii.) ~ >ITTol.!T '1" ~ t qi[ ~ <l<R IX ~*~ . 152 THE .GAZETTE OF INDIA : EX1RAORDINARY [PART lll-SEC. 4] (iii) 1'fRa if fcrqc! ~ V we <>11~fe•1- ~"11~'1 ~ ~-~ ;;sq<4>, 3747 Gl/10-20 <f;m!R~ i;c1'1T~ [PART Ill-SEC. 4] XII (xiii) ~ 1-il•lc;i8'l 31T4"1;1~: XIII ~ ~ ~: 9 ~j41<'1'l (v.)~~ 156 THE GAZETTE OF ffil!JIA : EXTRAORDINARY [PART III-SEC. 4] ~- V I~\~- I ~ I ~~3~ II III (iii) 'lffi<! ~ ~ ~ "\311-"CfR'1UT am ~ ~ : 9 (t1) am• ~ at)' fq,fcR-1 ' I ffl~ VI VII (x.) 'firlf 11$ ~ VIII ant.tt.~ (en)~~ (ll)~~ ('ti) ~ ~ (u) "'1'1<1'~ W'll'~ (viii) tif4c:1<"1<1>/~/qR~hEF1, ~/~ [PART ill-SEC, 4] (v.)~~ W<'i" 120 <R 160 THE GAZETIE ·oF INDIA : EXTRAORDINARY [PART 111-SEC. 4] - - I ·3 (ire) II (v) (vi) (vii) (viii) {ix) (x) (xi) (xii) (xiii) V = •~i:a,:.. Tl'~ t t III IV V VI (xiv) me~~ ~.~elm·~ ~ ~ e1m R<1>1~11 ~ ~ ,aq,i)<@/~ '3c!R~ 3747 Gl/10-21 162 11iE GAZETTE OF INDIA : EXTRAORDINARY [PART Ill-Soc.~) VII ~~ct;~ 12 IX X ~ 108tit {a) . fcl,m~ I R;r;r~ -Ne~ .-$it .~ [PART III-SEC. 4] ·.:mffi. I 2. ~ ~ Wlm ~ ~: ( i) ·<l'rc;c .................................... . (iii) l;(o'tfio~o'tfio .................... . 4. ~ ~ "ffi'ft cp[ "IT"[ ............ ': ............................................................ .. (q;) (iii) '<'f'T ~ ro ···········: ........................... . (ii) ....................................... . (i) ......................................................... : .... . (ii) ............................................................. . t, ~ if dT ~ t I 3TWT~1lmi I ii;~ 11mi? . ildTq I . 'ITT/~ mi-mt . ~ 'tio· - ----- 168 TIIB GAZETTE OF INDIA: EXTRAORDINARY [P AIIT III-,--SEC. 4] ~ .to ................................. f.'t&rur~ ~, ...................................... . (i). ~ .................... (ii) $;IT ~ ~ ························· (iii) -q".~.~.~ •................. (ii) ................................................................................................................... . (i) (ii) ••••••••••••••••••••••••••u••••••••••·•••••n••••••••·••••••••••••·•••••••••••••••••••••••••••••••••••••••••••••••••••• •••••••••••••••••••••••u••••••••••·••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• (l') . ••••••••••••••••••••••••••••n••••••H••••••••••••••»•••••••••••••••••••••••~••••••••••••••••••••••·•••·••••••••••••••••••••·• ~~.t,t ' .. FcltPll'l i I i}.- W61 -j ~ f~mr-rm i ? · 16 1fm i ? -mt ~~~t? ~~i? ''" 22 \1;<i~ "'ltl ' ·•=------ l -···- ---.. . 3747 Gi/10-22 37 <ITT~ i ·l71 NI~ ~I "'IT'l .........................•... ~'-" "flO .................... - 172 [PART Ill-SEC. 4] • ~ • I, <l. ~- • • 12 . ~~t~? fll;m "GIT "({!T i at). ~ '(fGi'f<:'( ~ ~ ~m~t'? "({!T i at). ~ '(fGl'f<:'( ~ ~ ~ "GIT ~ t'? * ~ ~ ~ 'i<'<liq,"I at). ~ ~ 1:iITq I ['11'1 IIJ-~ 4] Fcl"'4'1- ctm<ll lf<IT i I ii ~ 1l'll i? 174 1HE GAZETTE OF INDIA : EXTRAORDINARY . [PART Ill-SEC. 4J i ' ~. 1'i ~t? ~«!llf> . ' 28 ! ~ i$-~ (~ m .~ 1'i ~ ~ .~ ~ lTm i? i? ~ 37 fiel4k'<q;f ~ i 25 ~1{14R I J ~m~t? · • [PART lll-SEC. 4] t? '1'<1AJF<ha ~ I . i? ~ cfif'l;ll f<R.tll~'<i ~ ,;,rr ~ i I ~ if ill ·. 3747 Gl/10-23 ~-V ~c-1c11q-; (vii.) ~.3!R.1TT'I tc;~ •, - - ( 11) ~ <!Re: 3. ~ ~1cn, 5. ~ >M1<:'fl . ~ c'!<>11Fc\,• 1 ~m gxslt:IN/<ft~ '$ fui:; 13. ~ 6 Glif 3T<'1Pl ~ <5clt . ~-~ ~-am ~ ('ff.) sf>.~. ~"fie ~w.~. THE.GAZETTE OF INDIA : ~TRAORDINARY [PART III-SEC. 4] 2. ~-~31~, 'l11 3TT'! 3. ~~~' 'l11 3TT'! q~~ 3TT'! • 3.~tfNf~ mf'ffil 2.~ 3Wf • (-.!t)- 3W! (iii)~~~ cficlt (iii)~~~ cficlt 182 TIIB GAZETTE OF INDIA : EXTRAORDINARY [PART III-SEC. 4] <I>.~. 11G ., ~ I ~I ~I ,·~- VI '{\!l!'i; Wf<I' : • • - a 31'1~- VUI 1 100 cficfi 1.17 4.55 2 200 cficfi 1.80 5.65 3 300 cficfi 2.45 6.75 5 500 cficfi - 3.65 9.00 6 600 cficfi 3.98 10.1 7 800 cficfi 5.3 11.2 184 THE GAZETIE OF INDIA : EXTRAORDINARY [PART IIl'---SF.C. 4] f.r~wr11mm I (3) ~ ('lill) VCL • , Deflection ~ ¾14~'<1 ~ (Minimum Clearance Line) 3747 Gi/10-24 l&s 186 . · THE GAZETTE OJ;' INDIA : EXTRAORDINARY [PART III-SEC. 4] ~- XI mar~~ (1) ~ ~ ~ (tl:~. m ~-~-) I••·•"'""·"· l """""' ~ . - WPR ¢\q~fa ~ ~ ~- XiU (-«) cgtii "IN -..ti ~- XIII '3'1lm· (<1>) ~ («) ~l .............. :er;~~~~ ·~ cill \iIT'CT ~a,;, ~I il _____ ------------~~-- New Delhi, the 20th September, 2010 the Electricity A-ct, 2003 (36 of 2003); the Central Electricity Authority hereby makes the following regulations· for Measures relating to Safety and Electric Supply, namely: 0 Chapter I 1. Short title and Commencement.- (1) These regulations may be called the . Central Electricity Authority (Measures relating to Safety and Electric Supply) Regulations, 2010. (2) They shall come into force on the date of their final publication in the Official Gazette. . 2. Definitions.- (I) In these regulations, unless the context otherwise requires, {a) "Act" means the Electricity Act,2003; ' (b) "accessible" means within physical reach without the use of any appliance or special effort; ( c) "ampere" mean_s a unit of electric current and is a constant current which, flowing in two parallel straight conductors of infinite length of negligible cross section and placed at a distance of one meter apart in a vacuum will produce a force of 2x10·7 Newton per meter length between the conductors; _ (d) "apparatus "means electrical apparatus and includes all machines, fittings, accessories and appliances in which conductors are used; ( e) "bare" means not covered with insulating materials; (f) · "cable" means a .length of insulated single conductor(solid or stranded) or of two or more such conductors each provided with its own insulation, which are laid up together. Such insulated conductor or conductors may or may not be provided with an overall mechanical protective covering; (g) . "circuit" means an arrangement of conductor or conductors for the purpose of conveying electricity and f<;mning a system or a branch of a system; (h) "circuit breaker" means a device, capable of making and breaking the circuit under all conditions, and unless ot];,erwise specified, so de~igned as to break the current automatically under abnormal conditions; · (i) "concentric cable" means a composite cable comprising an inner conductor which is insulated and one .or more outer conductors which are insulated from one another and are disposed over the insulation of, and more or less around, the inner conductor; (j) .. conductor" means any wire, cable, bar, tube, rail or plate used for conducting electricity and so arraµged as to be electrically connected to a system;. (k) "conduit" means rigid or flexible metallic tubing or mechanically strong and fire resisting non-metallic tubing into which a cable or cables may be drawn for the purpose of affording it or them mechanical protection; · (I) "connected load" means · the sum of the ratings of the electricity consuming apparatus connected to a consumer's installation; · (m) "covered, with insulating material" means adequately covered with · insulating material of such quality and thickness as to prevent danger; . · (n) "cut out" means any appliance for automatically interrupting the transmission of electricity through the conductor when the current rises above a pre-determined amount, and shall also include fusible cut-out; { o) "danger" means danger to health or danger to life or any part of body . from shock, burn or other injury to persons, or property, or from fire or explosion, attendant upon the generation, · transmission, transformation, conversion, distribution or use of electricity; (p) "dead" means at or about earth potential and disconnected from any live system. It is used only with reference to current carrying parts when these parts are not live. (q) "designated person" mear1s a person designated under regulation 3; (r) "earthed" or "connected with earth" nieans connected with the general mass of earth in such manner as to ensure at all times an immediate discharge of electricity without danger; {s) "earthing system" means an electrical system in which all the conductors and appliances are earthed; (t) "enclosed sub-station" means any .premises or· enclosure or part thereof, being large enough to admit the entrance of a person after the apparatus therein is in position, containing apparatus for transforming or converting electricity to or from a voltage at or exceeding 650 V (other than transforming orconverting solely for the operation of switch gear or instruments) with or without any other apparatus for switching, controlling or otherwise regulating the electricity, and includes the apparatus therein; (u) "enclosed switch-station" means any premises or enclosure or part thereof, being large enough to admit the entrance of a person after the apparatus therein is in position, containing appan.itus · for switching, controlling or otherwise regulating electricity at or exc~eding 650 V but not for transforming or converting electricity( other than for transforming or converting solely for the operation.of switchgear or instruments)and includes the apparatus therein, {v) "flameproof enclosure" means an enclosure for electrical machinery or ·apparatus that will withstand, when the covers, or other access doors are properly secured, an internal explosion of the inflammable · gas or vapour which_ may enter or originate inside the enclosure, without suffering damage and without communicating the . infternal flammation { or explosion) to the external inflammable gas or vapour in which it is designed to be used, through any joints or other structural openings in the enclosure; · (w) "flexible cable" means a cable consisting of one or more cores each formed of a group of wires, the diameter and the physical properties of the wires and . ins~lating material being such as to afford fl'exibility. · [ '11'1 III-~ 4] (x} "guarded" means covered,. shielded, fenced or otherwise protected by means of suitable casings, barrier, rails or metal screens to remove the possibility of dangerous contact or approach by persons or objects to a point of danger; (y) "hand-held portable apparatus" means an apparatus which is so designed as to be capable of being held in the hands and moved while connected to a supply of electricity; above 100000 Volts used for transmission of power. (za) "inspector of mines" means an Inspector appointed under the Mines Act, 1952 (35 of 1952); (zb) "installation" means any composite electrical unit used for tlie purpose of generating, transforming, transmitting, converting, distributing or utilizing electricity; (zc) "intrinsically safe" as applied to apparatus or associated 'circuits shall denote that a::y sparking that ma)' occur in normal working is incapable of causing explosion of inflammable gas or vapour; (zd) "increased safety type 'e' " means a method of protection by which additional" measures are ·applied so as to give increased security against the possibility of excessive temperatures and of occurrence of arcs and sparks in apparatus which does not produce arcs or sparks in normal service; (ze) "lightning arrestor'' means a device which has the property of diverting to earth any electrical surge of excessively high amplitude applied to its terminals and is capable of interrupting flow current if present and restoring itself thereafter to its original operating conditions; (zi) "linked switch" means a switch with all the poles mechanically linked so as to operate simultaneous;;;; (zh) "metallic covering" means mechanically strong metal covering surrounding one or more conductors; (zi) "meter" means a device suitable for measuring, indicating and recordjng consl.lJ-nption of electricity or any other quantity related with electrical system and shall· include, wherever applicable, other equipment such as Current Transfonner (CT), Vo_ltage Transformer (VT) or Capacitor Voltage Transformer (CVT) with necessary wiring md accessories; (zj) "mine" ha, the same meaning as defined in the Mines Act, 1952 (35 of (zk) "neutral conductor" means that conductm of a multi-wire system, the voltage of which is normally intermediate betwee,, the voltages of the other conductors of the system and shall also include return wire of the single phase system; (zl) "occupier" means the owner or. person in occupation of the premises where electricity is used or proposed to be used; (zm) "ohm" means a unit of electrical resistance and is the electrical resistance between two points of a conductor when a constant potential difference of one volt, applied to these points produces a current of one ampere in the coriductor, provided no electromotive force is generated in the conductor; (zn) "open spa,king" means sparking which owing to the lack ,of adequate provisions for preventing the ignition of inflammable gas external to the apparatus would ignite such inflammable gas; 192 TIIE GAZETTE OF INDIA: EXTR<\ORDINARY [PART III,---SEC. 4] (zo) "overhead line" means any electric supply line which is placed above ground and in the open air but excluding live rails of a traction system; (zp) "owner" means the company or body corporate or association or body of individuals, whether incorporated or not or artificial juridical person which owns or operates or maintains Electric Plants and Lines; (zq) "owner", "agent" and "manager'' of a mine have the same meanings as are assigned to them in the Mines Act,1952(35 of 1952); (zr) "poles" means the phase terminals of a Switch. (zs) "portable apparatus" meaI)S an apparatus which is so designed as to be capable of being moved while in operation; (zt) "portable hand lamp" means a portable light-fitting provided with suitable handle, guard and flexible cord connected to a plug; (zu) "Schedule" means a schedule to these regulations. (zw) "section" mearts a Section of the Act; (zv) "span" means the horizontal distance between two adjacent supporting points of an overhead conductor; {zw). "street box" means a totally enclosed structure, either above or below ground containing apparatus for transforming, switching, controlling or (zx) "supplier" means any generating company -or licensee from whose system electricity flows into the system ofanother generating company or licensee or consumer; (zy) "switch" means a manually operated device for opening and closing or for changing the connection of a circuit; (zz) "switchboard" means an assembly including the switchgear for the control of electrical cjrcuits, electric connections and the supporting frame; (zza) "switchgear'' shall denote_ switches, circuit breakers, cut-outs and other apparatus used for the operation, regulation and control of circuits; (zzb) "system" means an electrical system in which all the conductors and apparatus are electrically connected to a common source of electric supply; (zzc) "transportable apparatus" means apparatus which is operated in a fixed position but which is so designed as to be capable of being moved readily from one place to another; (zzd) "volt" means a unit of potential difference of electro,motive force and is the difference of electric potential which exists between two points of a conductor carrying a constant current of one ampere, when the power · dissipated between these points is one watt; . (zze) ''voltage" means the difference of electric potential measured iti Volts between any two .conductors or between any part of either conductor ,and the earth as measured by a voltmeter meeting Indian Standards; (zzt) "watt'' is a unit of active power and 0MW" means megawatt and,is equal to 106 watts. · (2) Words and expressions used and not defined in these regulations but defined in the Act shall have the meanings respectively assigned to them in the Act. [111'1 m~~ 4J Chapter II 3. Designating person(s) to operate and carry out the work on electrical lines and•. apparatus.- (1) A supplier or a· consumer, or the owner, agent or manager of a mine, or the agent of any company operating in an oil-field or the owner of a drilled well in an oil field or a contractor who has entered into a contract with a Sllpplier or a consumer to carry out duties incidental to the generation, transformation, transmission, conversion, distribution or use of electricity shall designate persons for the purpose to operate and carry out the work on electrical lines and apparatus. (2) The supplier or consumer, or the owner, agent or manager of a mine, or the agent of any company operating in an oil-field or the owner of a drilled well in an­ oil field or a contractor referred to on sub-regulation (1) shall maintain a'register wherein the names of the designated persons and the purpose for which they are engaged, shall be entered · (3) No person shall be designated undersubsregulation (1) unless,- (i) he possesses a certificate of competency or electrical work permit, issued by the Appropriate Government. (ii) his name is entered in the register referred to in sub-relgulation (2). 4. Inspection of designated officers and other safety measures.- ( 1) The register maintained under sub-regulation (2) of regulation 3 shall be produced before the · Electrical Inspector when required by him. (2) If on inspection, the Electrical Inspector finds that the designated person does not fulfill the required qualification, he shall recommend the removal of the name of such persons from the register .. S. Electrical Safety Officer.- (1) All suppliers of electricity including generating companies, transmission companies and .distribution companies shall designate an Electrical Safety Officer for ensuring observance of safety measures specified under these regulations in their organisation for construction, operation and maintenance of power· stations, sub-stations, transmission and distn'bution lines. (2) The. Electrical Safety Officer shall be an Electrical Engineering degree holder with at least ten years c,f experience in operation and. maivtenance of electricity plarits or ari Electrical Engineering Diploma holder with at least fifteen yeara of experience'i,_n operation and maintenance of electric plant. · (3) The Ele~trical Safety Officer designated un.der sub-regulatio·n· (I), shall ensure periodic inspection of such installations, get them tested and keep a record thereof and such records shall be made available to the Electrical Inspector if and when required. (4) For every factory registered under Factory Act, 1948, where mere than 250 kW of electrical load is connected, the management of the factory shall designate a person having qualification specified in sub-regulation (2), for ensuring the 3747 Gl/10-25 observance of the safety provisions laid under 'the Act and the regulations made thereunder, who shall periodically inspect such installation, get them tested and keep a record thereof and such records shall' be made available to the E,lectrical Inspector if and when·required. · · · 6. Safety measures for operation and, maintenance of electric plants.• (I) Engineers and stipervisors appointed to operate or' undertake· maintenance of any part or whole of a thermal power generating station and a hydro power plant together with the associated sub-statiO!) shall hold diploma in Engineering from a recognized instirute, or a degree in Engineering from a university. (2) The Technicians to assisi engineers or supervisors sha11 possess a certificate in appropriate trade, preferably with a two years course from a Industrial Training Institute recognized by the Central Government or the State Government. (3)' Engineers, . superviSllrs and Teclu;licians engaged for operation and maintenance of electric plants should have successfully undergone the type of training as specified in Schedule-I. Provided that the existing employees shall have to undergo the training mentioned in sub-regulation,(3) within. three years from the date of coming into force of these _regulations. · (4) The owner of every thermal power generating station aod hydro power plant· tQgether with their aSS-Ociated sub-station shall arrange for training of personnel engaged in the operation and maintenance of his generating station. along with associated s.ub-statioo in his own institute or any other institute recognized by the Central Government or the State Government. · P.rovided that· separate training shall. be given to the persons engaged in operation and maintenance of themial power stations and hydrq power stations 7. Safety measures for operation 11nd maintenance of transmission, distribution systems.- (J) Engineers or supen<isors engagec\_jn operation and 'maintenance 9f transmission and distribution systems shali bold diploma in electrical, mechanicaL electronics and instrumentation Engineering from a recognized institute or university. (2) 11te Technicians to assist engineers or supervisors shall possess a certificate in• appropriate trade, preferably with a two year~ course· from a Industrial Training Institute recognized by the Central Government' or State Government. (3) . Engineers, supervisors and Technic,ians engaged for operation and maintenance of transmission and distribution systems electric plants. should have suc~ssfully' µndergone the type of training as specified in Scbedule-ll. . . Provided that the existing employees shall have to undergo the training mentioned in sub-regulation (3) within three years· from the date of coming into force ·of these regulations. (4) Owner of every transmission or distribution system shall arrange for training of their personnel engaged in the operation and maintenance of transmission and distribution system in his own institute or any other institute recognized by the Central Government or State Government. 8. Keeping of records and inspection thereof.- (!) The generating company or licensee shall maintain records of the maps, plans· and sections relating to supply or transmission of electricity a.'ld submit the same to the Electrical Inspector for inspection as and when required by him. (2) The Electrical Inspector shall supply a copy of the report of inspection referred to in sub-regulation (I), to the generating company or licensee, as the case m.ay be. 9. Deposit of maps. - When : . iumse has been granted, two sets of maps showing, as regards such Jicerisee, the particulars specified in application for licemse .shall be signed and elated to correspond with the date of notification of the grant of the license by an officer designated by the Appropriate Commission in this behalf, one set of such maps shall be retained by the said officer and the other one shall be furnished to the licensee. 10, Deposit of printed copies.- (I) Every person who is granted a license, shall, within thirty days of the grant thereof, have copies of the license and maps, showing the area of supply as specified in the ·license to Exhibit I same for public inspection at all reasonable times at his head office, his local offices, if any, and at the office of every local authority. within the area of supply. (2) Every such licensee shall, within the aforesaid period of thirty days, supply free of charge one copy of the license along with the relevant maps to every local authority within the area of supply and shall also make necessary arrangement for the sale of printed copies of the license and maps to all persons applying for t]le same, at a price to be notified by the Appropriate Government from time to time. 11. Plan for area of supply to be made and kept open for inspection.- (I) The licensee shall, after commencing to supply electricity, forthwith cause a plan, to be made in electronic form, of the· area of supply, and shall cause to be marked thereon the alignment and irt the case of underground works, the approximate depth below the surface of all the existing electric supply lines, street distributing boxes and other works, and shall once in every year cause that plan to be. duly · corrected so as to show the electric supply·lines, street distributing boxes amd other works for the time being in position and shall also, if so required by an Electrical Inspector, cause to be made sections showing .the approximate level of all his existing underground works other than service lines. (2) Every plan· shall . be _clrawn to such horizontal· and vertical scale as the Appropriate Commission may t.~quire. Provided that no scale shall be required unless maps of the locality on that scale are for the time being available to the public. · (3) Every plan and-section so made or corrected, or a copy thereof, marked with the date when it was made or corrected; shall be kept by the licensee at his principal office or place of business within the area of supply, and shall at. all reasonable times be open to the inspection of ail applicants, and copies thereof shall be supplied. Provided that ex1stmg ahd old plans and sections and underground distribution network shall be converted to electronic form within three years from the·date of commencement of these regulations. (4) Global Positioning System (GPS) rnapping\;r mapping through any other · latest technology, of existing and old plans and sections shall be comple\ed within five years from the date of commencement of these .regulations and new plans and sections shall be compatible to the Global Positioning System mapping or mapping through any other latest technology. (5) The licensee shall, if required by an Electrical Inspector, and, where the licensee is not a local authority, by the focal authority, if any, concerned, supply free of charge to such Electrical Inspector or local authority a duplicate copy of every such plan or section or a part of the same du1y conected. (6) The copies of plans and sections under this regulation shall be supplied by the licensee to every applicant on the payment of such · fee as the Appropriate Commission may, by regulation, specify. Chapterm Generalsafety requirements , 12. General safety requirements . pertaining to construction, installation, protection, operation and maintenance of electric supply · lines . and apparatus.- ( 1) All electric supply lines and apparatus shall be of sufficient rating_ __ for power, insulation and estimated fault current and of sufficient mechanical strength, for the duty cycle which they may be required to perform under the environmental conditions . of installation, and shall be constructed, insta:lli,d, protected, worked and maintained in such a manner as to ensure safety of human beings, animals and property. (2) Save as otherwise provided in these regulations, the relevant code of practice of the Bureau of Indian Standards or National· Electrical Code, if any, may be followed to carry out the purposes of this regulation and in the event of any inconsistency, the provisions of these regulaions shall prevail. · (3 ) The material and apparatus used shall conform to the relevant specifications of the Bµreau of Indian Standards or International Ele!ctro-Technical Commission where such specifications have already been laid down. (4) All electrical equipment shall be installed above the Mean Sea Level (MSL}as declared by local Municiple Authorities and where such equipment is to be installed in the basement, consumer shall ensure that the design of the basement [ "11'1 III-~ 4] should be such that there is n9 seapage or leakage or logging of water in the basement. 13,, Service Hnes and apparatus on consumer's premises.- (1) The supplier shall ensure that all electric supply lines, wires, fittings and apparatus belonging to him or under his control, Which are on a consumer's premises, are in a safe-condition and in all respects fit for supplying electricjty and the supplier shall take precautions to avoid danger arising on such premises from such supply' lines, wires, fittings and apparatus. (2-) Service lines placed by the supplier on the premises of a consumer which are underground or which are accessible shall be so insulated and protected by the supplier as to be secured under all ordinary con di !ions against electrical, mechanical, chemical or other injury to the insulation. (3) The consumer shall, as far as circumstances permit, take precautions for the safe custody of the equipment on his premises belonging to the supplier. (4) The consumer shall also ensure that the installation under his control is maintained in a safe condition .. 14, Switchgear on consumer's premises.- (I) The supplier shall provide a suitable switchgear in each conductor of every service line other than an earthed or earthed \ neutral conductor or the earthed external conductor of a concentric cable within a consumer's premises, in an accessible position and such switchgear shall be contained within an adequately enclosed fireproof receptacle: Provided that where more than one consumer is supplied through a common service line, each such consumer shall be provided with an independent · switchgear at the point of rigid junction to the common service. (2) Every electric supply line other than the earthed or earthed neutral conductor of any system or the earthed external conductor of a concentric cable shall be protected by a suitable switchgear by its owner. 15. Identification of earthed and earthed neutral conductors and position. of. switches and switchgear therein.- ·· Where the conductors include an earthed· .conductor of a two-wire system or an earthed neutral conductor of a multi-wire sys_tem or · a conductor which is to be connected thereto, the following conditions shall be complied with:- · · (t) an indication of a permanent nature shall be provided by the owner of the earthed or earthed neutral conductor, or the conductor which is to be connected thereto, to enable such conductor to be distinguished from any live conductor and such indication shall be provided- (a) where the earthed or earthed neutral conductor is the property of the supplier, at or near the point of commencement of supply; . (b) where a conductor forming part of a consumer's system is to be connected to the supplier's earthed or earthed neutral conductor, at the point where such conneetion is to be made; ·( c) in all other cases, at a point corresponding to the point of commencement of supply or at such other points as may be approved by an Electrical Inspector. (ii) no cut-out, link or switch othe_r than a linked-switch arranged to operate simultaneously on the earthed or earthed neutral · conductor and live conductors shall be inserted or remain inserted in any earthed or earthed neutral conductor of a two wire-system or in any earthed or earthed neutral conductor of a multi-wire system or in any conductor connected thereto. Provided that the above requirement shall not apply in case of­ ( a) a link for testing purposes, or (b) a switch for use in controlling a generator or transformer. 16. Earthed terminal on consumer's premises.- (1) The supplier shall provide and maintain on the consumer's premises for the consumer's use, a suitable earthed terminal in an accessible position at or near the point of commencement of supply. Provided that in the case of installation of voltage exceeding 250 V the consumer shall, in addition to the aforementioned earthing arrangement, provide· his own earthing system with an independent electrode. Provided further that the supplier may not provide any earthed terminal in ihe case of installations already connected to his system on or before the date to be specified by the State Government in this behalf if he is satisfied that the consumer's earthing arrangement is efficient. (2} Toe consumer shall take all reasonable precauti_ons to prevent mechanical damage to the earthed terminal and its lead belonging to the supplier. (3) The supplier may_ recover from the consumer the cost of installation on the -basis of schedule of charges published by him in advance and where such schedule of charges is not published, the procedure laid down, in regulation 63 shall apply. Ex.pl;ation.- For the purposes of sub-regulation (1 ), the ~xpression "point of comm ncement of supply of electricity" shall mean the point at the incoming termi 1 of the switchgear installed by the consumer. 17. Accessibility of bare conductors.~Where bare conductors are used in a building, the owner of such conductors shall,-. (a) ensure that they are inaccessible; (b) provide in readily accessible position switches for rendering them dead whenever necessary; and ( c) take such other safety measures as are specified in the relevant Indian Standards. 18. Danger Notices.- The owner of every installation of voltage exceeding 250 V shall affix permanently in a conspicious position a danger notice in Hindi or English and the local language of the District, with a sign of skull and bones of a design as per IS -2551 on- (a) every motor, generator, transformer and other electrical plant and equipment together with apparatus used for controlling or regulating the same; (b) all supports of overhead lines of voltage exceeding 650 V which can be easily climbed upon without the aid ofladder or special appliances; (c) luminous tube sign requiring supply, X-ray and similar high frequency installations of voltage exceeding 650 V but not exceeding 33 kV: Provided that • where it is not possible to affix such notices on any generator, motor, transformer or other apparatus, they shall be affixed as near as possible thereto, or the word 'danger' and the voltage of the apparatus concerned shall be permanently painted on it: Provided forther that where the generator, motor, transformer or other apparatus is within an -~nclosure one notice affixed to the said enclosure shali be sufficient for !he purposee of this regulation. Explanation- For the purpose of clause (b) rails, tubular poles, wooden supports, reinforced cement concrete poles without steps, · I-sections and channels, shall be deemed as supports which cannot be easily climb~d upon 19. Handling of electric supply -lines and apparatus.- (I) Before any conductor or apparatus is handled, adequate precautions shall be taken, by earthing or other suitable means, t() discharge electrically si.;ch conductor or apparatus, and any adjacent conductor or apparatus if there is dai:ger therefrom, and to prevent any conductor or apparatus from being accidentai!y or inadvertently electrically charged when persons are working thereon. (2) Every person who is working on an eiectric suppiy line or apparatus or both shall be provided with tools and devi~es such as gloves, rubber shoes·, safety belts, ladders, earthing devices, helmets, line testers, hand lines and the like. for protecting him from mechanical and electrical injury and such tools and devices shall always be maintained in sound and efficient working condition. (3) No persen shall work on any live electric supply line or apparatus and no ·person shall assist such person on such work, unless he is designated in that · behalf, and takes the safety precautions given in Schedule-III. -- --- _-,77----= - ---- -o,,c_ (4) Every telecommunication line on supports carrying a line of voltage exceeding 650 V but not exceeding 33 kV shall, for the purpose of working thereon, be deemed to be a line of voltage exceeding 650 V. (5) AH non~current carrying metal parts of switchgear and control panels shall be properly earthed and insulating floors or mat conforming to IS-I 5652: 2006, of appropriate voltage level shall be provided in front of the panels for the safety of operating personnel. (6) All panels shall be painted with the description of its identification at front and at the rear. 20. Supply to vehicles aud cranes.- Every person owning· a vehicle, travelling crane, or the like to which electricity is supplied from an external source shall ensure that it is efficiently controlled by a suitable switch enabling all voltage to be cut off in one operation and, where such vehicle, travelling crane or the like runs on metal rails, the owner shall ensure that the rails are electrically continuous and earthed. 21. Cables for portable or transportable apparatus.- (!) Flexible cables shall not be used for portable or transportable motors, generators, transformers, rectifiers, electric drills, electric sprayers, welding sets or any other portable or transportable apparatus- unless they are heavily insulated and adequately protected from mechanical injury. (2) Where the protection is by means of metallic covering, the covering shall be in · metallic connection with the frame of any such apparatus and earthed. (3) The cables shall be three core type and four core type for portable and transportable apparatus working on single phase and three phase· supply respectively and the wire meant to be used for ground connection shall be, easily identifiable. 22. Cables- protected by bituminous materials.- (1) Where the supplier or the owner has brought into use an electric supply line, other than a~ overhead liue, which is not completely enclosed in a continuous metallic covering connected with earth and is insulated or protected in· situ by composition or material of a· bituminous character,- · (i) any pipe, conduit, or the like into which such electric supply line may have been drawn or placed shal), unless other. arrangements are approved by the Electrical Inspector in any particular case, be effectively sealed at its_ point of entry into any .sireet box so as to prevent any flow of gas to or· ,from the street box, and; (ii) such electric supply line shall be periodically inspected and tested where accessible, and the result of each.such inspection artd test shall be . duly recorded.by the supplier or the owner. {2) The supplier or the owner after the coming into force of these regulations, shall not bring into use any further .electric supply line as aforesaid which is insulated or protected in situ by any composition or material known to be liable to produce noxious or explosive gases on excessive heating. 23. Street boxes.- (1) Street boxes shall not contain gas pipes, and-precautions shall be taken to prevent, as far as reasonably possible, ·any influx of water or gas. (2) Where electric supply lines forming part of different systems pass through the same street box, they shall be readily distinguishable from one another and all electric supply lines of voltage exceeding 650 V at or in street boxes shall be adequately supported and protected so as to prevent risk of damage to or danger from adjacent electric supply lines. · · {3) All street boxes shall be regularly, inspected for the purpose .of detecting the presence of gas and. if arty influx or accumulation is discovered, the owner shall give immediate notice to any authority or company who have gas mains in the neighbourhood of the street box and in. cases where a street box is large enough to admit the entrance of a person after the electric supply lines or apparatus therein have been placed in positio_n, ample provision shall be madec (i) to ensure that any gas which may by accident have obtained access to the box shall escape before a person is allowed to enter; and (ii) for the prevention of danger from sparking. (4) The owners of all street boxes or pillars containing circuits or apparatus shall ensure that their covers and doors are kept closed and. locked and are so provided that they can be opened only by means of a key or a special appliance. 24. Distinction of different circuits.- The owner of every generating SF;tion, sub­ station, junction-box or pilladn which there are any circuits or apparatus, whether intended for operation at different voltages or at the same voltage, shall ensure by means of indication of a permanent nature that the respective circuits are readily distinguishable from one another. 25. Distinction of the Installations having more than one feed.- The owner of every installation including sub-station, double pole structure, four pole structure or any other structure having more than one feed, shall ensure by means of indication of.a . permanent nature, that the• installation is readily distinguishable from .· othtr 26. Accidental charging.- (I) The owners of •all circuits and apparatus shall so. arrange them that there shall be no danger of any part thereof becoming accidentally charged to any voltage beyond the limits of voltage for which they aie intended. (2) Where alternating current and direct current circuits.are installed on the same box or support, they shall be so arranged and protected that they shall not come into contact with each other when live. · 27. Provisions applicable to protective equipment.- (1) Fire buckets filled with clean dry sand am! ready for immediate use for extinguishing fires, in addition to fire extinguishers suitable for. dealing with fires, shall be conspicuously marked 3747 Gl/10-"--26 and kept in all generating stations, enclosed sub-stations and switching-stations in convenient location. (2} .1be fire extinguishers shall be te~d for satisfactory operation ,as per relevant , •; , .,.· Jndian Standard at least once a year an4 ,record of su<:h iests shal\pe, maintained . ... ,(3) First-aid ~~s or cupboards co~'spicuously tll/U"ked,and eqµipped with such ' : contents.as the-State. Government may specify, shaHbe provideq and maintained . in every generating station, enclosed sub-station, enclosed switching 'station and in vehicles used for Inaintenance ·of lines so as to ):/e rea4ily, ac,ce~ible during all _< working hours and a!]. such boxes and cupboar.ds 1,~ii]l, eJlcept,ip tlie case of · .. , .. unattende.d sub-stations and switching stations, be ,k\lpt ii;t charge of. responsible persons who are trained in first-aid treatment and one of such pei:sons shall be available during working hours. ' . . .. (4} two or rne>re gas n,iasks shall be proviqaj 'c~n§;ic~ou;ly and instilled and maintained at accessible places in every generating station with capacity of 5 MW and above and enclosed sub-station 'Yitll,.t;i;a11~f<:>rrna,tion capacity of 5 .. MV Aand above for use in the event of fire or.smoke:· . . . Provided that where more than one ge~~;kt~K'Nith\apacity ~f5 MW and above is installed in a power station, each.generator shall he pm,;ded with at least two separate gas masks in an accessible and con,spicuous, pia,:p: Provided further that adequate number of gas· masks ,,,, ,; , tc provided by the owner at every generating station and enlose\l sub-stapon with ~apacity less than. 5 MW and 5 MV A respectively. · 28. Display of instructions for resuscitation of persons suffering from electric shock.- (!)··Instructions, in English or Hindi and the local language of the District ·. and where Hindi is the local language, in English and Hindi for the resuscitation of persons suffering from electric shock, shall be affixed, by the owner in a · conspicuous place in every ·generating station,· enclosed .sub-station, enclosed switching station, mines and in every factory as d~finedinclause,(m) of section 2 . of the Factory.Act,1948 (63 of 1948) in which electricity is used and in such other premises where electricity is used as the. Electrical Inspector may, by notice in writing served on the owner, direct. (2) The • owner of every generating station, .. en~lo,sed, s:ub-station, en.,Josed switching<station and every factory or other premi_ses to which these regulations /•apply, shall ensure that all designated persons ernj>lilyed by him are acquainted with and are competent to apply the instructions referred to in sub,regulation (I). (3) In every manned generating station; sub-station: or-switching station of voltage exceeding .650 V, an artificial respirator shall be ,provided and kept in good working condition. · · 29. Precautions to· be adopted by consumers, owners, occupiers, · electrical contractors, electrical workmen and suppll-irs.- · (l} No electrical installation work, including additions, alterations, repaus and adjustments to existing installations, except such replacement of lamps; fans; fuses, switches, domestic appliances of voltage not exceeding 250V and fittings as in no· way alters its capacity or character, shall be carried out upon the premises of or on behalf of any consumer, supplier, owner or occupier for the purpose of supply to such consumer, supplier, owner or occupier except by an electrical contractor licensed in this behalf by the State Government and under the direct supervision of a person holding a certificate of competency and by a person holding a permit issued or recognised by the State Government. · Provided that in the case of works executed for o~ on behalf of the Central . Governmept and•. in the ·.· case of installations in. milies, oil fields and railways, the Central.Government and in other cases the State Government, may, by notification in the Official Gazette,· exempt on such conditions as it may impose, any such work described, therein eith~r generally or in the case of any specified class of consumers, suppliers, owners· or occupiers. · (2) No electrical installation work which has been carried out in contravention of sub"regulation (I) shall either be energised or connected to .the works of any supplier . 30. Periodical inspection alld 'testing of Installations.- (1) Where an installation is · already connected to the supply system of the supplier or trader, every such installation shall be periodica1iy' inspected and tested at intervals not exceeding five years either by the Electrical Inspector or by the supplier as may be directed by the State Government in this behalf or in t.'ie case of installations belonging to, or under the control of the Central Government, and in the case of installation in· mines, oilfields and railways, by the Central Government. ,~· · ·(2) The periodical inspection and testing·ofinstallations of voltage abo~ 650 V belonging to the supplier, shall also be carried out at intervals not exdi4;Uig five years by the Electrical Inspector; · :;;;;,,, (3) Where the supplier is directed by the Central or the State Government, as the . case tnay be, to inspect and test the installation, he shall report on the condition of the installation to the consumer concerned in the Forms I, II and III as specified in Schedule-IV and shall submit a copy of such report to the Electrical Inspector; ( 4) The Electrical Inspector may, on receipt of such report, accept the report submitted by the supplier or record variations as the circumstances of each case may require and may recommend that the defects maybe ractified as per report; . (5) In the event of the failure of the owner of any installation to rectify the defects in his instal!Btion pointed ont by .the Electrical Inspector in his report and within the time indicated therein, suchinstallationshall be liable to be disconnected under the directions of the Electrical Inspector· after serving the owner of such installation with a notice for not less than forty eight .hours. Provided that the installation shall not be disconnected in case an appeal is ·. made under sub-rule (i) of rule (8) of "Qualifications, Powers and Functions of Chief Electrical Inspector and Electrical Inspectors issued by Central Government vide GSR 481 (E) .dated 17.08.2006 and the appellate authority has stayed the .orders of disconnection. 204 THE GAZETTE OF INDIA : EXTRAORDJNA]{y [PART III-SEC. 4] 31. Testing of consumer's installation.- (1) Upon receipt of lln application for a new or ·. additional supply of electricity and before connecting the supply or installation Jiimsel(or accept the tesqesµlts. submittetlixJl!i: 99,µsun;ier when the (2) The supplier shall maintain a record of test results obtained at each supply point to a consumer, in a Schedule-V. (3) · Ifas a result of sucli inspection and test, the supplier is satisfied that the installation is likely to be dangerous, he shall serve. on the app1icant a notice in writing requiring him to make such modific11ti91!5, as,are,necessary to render the installation· .safe.· and may refuse to connect or.reconnect the supply until the . reqµired modifications have been completed: : , . . i .. 32. InstaUatiop ~nd testblg of generating ,µ~;,:, (;11p~tjty l\bo:.,e which generating units will be required to be inspected by the Electrical Inspector before commissioning shall be as per the notification to be issued by the Appropriate Government, under clause (x) sub-section (~}.of sectjon 17~ and sub-section (1 ).of section 162 of the Act. ' · · · Chapter IV General conditions relating to supply and use nfelectricity 33. Precautions against leakage before connection.- O) The supplier shall not connect with his works .the installation or apparatus on, the ·premises of any . 11pp)icant for supply unless he is reasonably satisfied that,the c.onnectionwill not at the . time .of making the connection cause.· a Jeakage. , . fr-Om that . installation or apparatus of a magnitude detrimental to safety, which shall be checked by . , ... measuring the installation resistance as under,• · (i) all equipments sha11 have the insulation resistance (IR) va1ue as stipulated in the relevantlndian Standards; · · · · · · · · ' · (ii) on application of 500 V DC between each live conductor and earth for a period of one minute the insulation resistance of installation and equipment of voltage not exceeding 650 V shall be .atle!lstl MEGAQIIM or as specified in the r:elevant Indian Standard; · · · · · · ' · · ,,. · · '(iii) on applica.tioii of 2.5 kV· DC betweJn e,achJive' coiid;ctor and earth for a period of one minute, the insulatiqficrem~tan~e, o{inst;illation and equipment 'of v'i:!ltagc:i exceeding 650 V but not'ixce~h.)g ~f.ky:shaU bi: at least 5 MEGA OHM or as specified in the relevant Indian Sl/indard. · (2) If the supplier declines to make a connection unddr the provisions of sub­ regulation (1) he shall convey to the appjic~nt,the ,r~asons .in. \l(riting for so declining. · · , · · 34. Leakage on consumer's premises.- (1) If the Electrical Inspector or the supplier has reasons to believe that there is leakage in the system of a consumer which is likely to affect injuriously the use of electricity by the supplier or by other persons, or which is likely to cause danger, he may give the consumer notice fu writing that . he desires tq inspect !1,nd test tile consumer's installation. · ' ' _- a • '_' ., • ' • ·,·, • • (2) If on such ~i>ti~e being, given the CO'llSU!llei'does rit>t give ali reasonable facilities for i~tion and testing of his installation, or · When an insulation resistance. of the e9nsum~r•s installation is so low as to. prevent safe use . of electricity, the supplieqnay, apd if directed so to do by the Blectrical Inspector . shall discontinue. ili.e supply 'ofe\ectticity to the. installatioI1 but only after giving to the consumer forty eight 'hours hofice in writing of disconnectioh of supply and shall not recommence the suppiy uniil he or the Electric~! Inspector is satisfied . that the cause of tile leakage Ila~ been j-ertioved. ·.· · · · 3S, Supply and use of electricity.- : (1) The el~ctricity shall n;;t" be supplied, transformed, converted, inverted or-used or continued to be supplied, transformed, converted, inverted or used unless the conditions contained in sub-regulations (2) to (8) are complied with. :, · · (2) The following controls ofrequi~ite capacity to carry and break the current shall · be placed as near as po~s\l?le:111'erJhe poillt of commencement of supply so as to be readily acc.f!ssible ap,d. CQP@li,9fbeingJ1asily operated \o completely isolate the supply to the installation,, §U<;h. !)qUipment being in addition to any equipment installed for controlling-1pdivjdual, circuits or apparatus, nam,e)y:a, . (i) a linked switch with ,fuse or a circuit breaker by consumers of voltage which does.not exceed 650 V; . .(ii) a linked switch'with·fuse or a circuit breaker by a consumer of voltage exceeding 650V but not exceeding 33 kV. having aggregate installed trartsformer · or apparatus capacity up to 1 000 KV A to be supplied at voltage upto 11 kV and2500 KVA at higher voltages (above 11 kV and notexceeding __ 33JcV); · (iii)_ a circuit b,t\:~i'~yc9nsu111~rs atygltage exceeding 650 V but not exceeding 33 ,kV having an aggreg'iite · installed transformer and apparatus capacity a;t,ove,·1000, K,VA .and. supplied ;it voltage upto 11 kV and above 250Q,K'{A !1,Llrighqr:v9J~ges (above it kV and not Pr<>vip~d pi;it '\yhert~ th,e pointpf commencement -of supJ:'lY and the consumer apparatus are nciar each other; one linked switch with fuse or circuit · .breaker near the point of commenCeD3entof ~upply shall be considerecl sufficient. (3) In case of every transfonner the following shall be provided; namely:- (i) on primary side for transfonners a linked swi.tch with fuse or. circuit breaker of adequate capacity: • · . . . ·. Providep that the iinked switch 0~ the prilllao/ sid~ of the . transformer may be of sue~ capacity as to carry the' full load current and to bre~'enly the inai'letising current of the transformer: Proviiei further that for~ll.transfoimers: (a) having a capacity of 5000KVA and above installed before the year 2008; and (b) having a capacity 1000 KV A arid above installed in or after the year 2000, a circuit breaker shall be 'provided: · · · Provided also that thll linked switch on the primary side of the transformer shalf'not required for the unit auxiliary transfonner and generator transformer; (ii) in respect of all transfonners installed in or after the year 2000, on the secondary side of all transformers a circ11it breaker of adequate rating shall . be installed: · Provided that for suppliers' transformers of capacity below 1000 KVA, a Jinked switck with fuse or circuit breaker of adequate rating shall be installed on secondary side. (4)Except in the case of composite control gear designed aSa unit each distinct ci,:cuit is to be protected against excess energy by means of suitable cut-out or a circuit breaker of adequate breaking capacity suitably• located and so constructed as to prevent danger from overheating, arcing or scattering of hot metal when it comes into operation and to permit for ready renewal of the fusible metal. of the (5) The supply of electricity to each motor or a group of motors or other apparatus meant for operating one particular machine shall be controlled by a suitable linked switch or a circuit breaker or an emergency tripping device with. manual reset of requisite capacity placed in such a position as. to be. adjacent to ,the motor or a groJIP of motors or other apparatus readily accessible to and easily operated by the pef!!on inc4arge and so connected in the circuitthat j,y its .means all supply of electricity can be cut off from the motor or group .of motors or apparatus from any regulating switch,· resistance of other device associated· therewith. ( 6} All insulating materials shall be cho.sen with special regard to the circumstances .of their pronosed use and their mechanical strength shall be sufficient for t4eir purpose and so far as is practicable of such a character or so protected as to maintain adequately their insulating property under all working conditions in respect of temperature and moisture; and • (7) Adequate precautions shall be taken to en§ure that no;live·parts are s.o exposed as to cause danger. (8) Every consumer shall use all reasonable means to ensvre .. that i.vhere electricity is supplied by a supplier no pers<;m. other than the. suppliei:. shall, interfere with service lines and. apparatus placi-1 by the .supplieron the. premises of the consumer. 36,,Provlsions for supply.and ~sec~f~iectricity in multi-storeyed building more ,,than 15 metres in heigbt~·(J).Jhe connected load !lfld voltage of suJ>ply above ,which inspection is .io,be;carrieq,oq1,by an Electrical 'Inspector for. a multi­ storeyed bulding of more ·than fifteen meters .height shall be notified by the Appropriate Government. (2) Before making'.,a~/~ppJication for commenqement .of supply or recommencement of supply i!JtwaI) installatioi), has been disconnected for a period · •• of six months or more, the; o:.vrieror ocupier of a multi:storeyedbuilding shall give . not less than thirty days notj(\e in writing to the Electrical Inspector specify therein • · the particulars of insta1lation)1nd the supply of electricity shall not be commenced or recommenced withifl•,thi~.;period, v,'ithout the approval in writing of the Electrical Inspector. · · (3) The supplier or owner of the installation shaU provide 'at the point of commencement of supply, a. suitable isolating device with cut0out or breaker to operate on all phases, ~xcept neutral in the 3,phase, 4-wire circuit and fixed in a conspicuous position at riot more than L 70 metres above the grofill.d so as to · completely isolate the supply to the buHding in case of emergency. ( 4) The owner or occupier 1>fatnulti,st9reyed building shall ensure that electrical installations and works inside the building are carried out and maintained in such a. manner as to prevent danger due. to shock. and fire hazards, and the installation is ' ' carried out in accordanqe 'witlltpe relevant codes ()f practice . . (5) No other service pipe~ 'and' cablessh~ll 'be Ween along the ducts provided fof · laying power cables and all· ducts ·provided for power cables and other services shall be provided with fire barrier at each floor crossing. following conditions ,sh;ill. be c<>mplfod with whete electriliity of vqltage above ' (i) all conductors.other than those of ov~rhead lines, sl)all be b<>mpletely ' enclosed in mechanically strong metal casing ormetallic covering \Vhich is .. electrically and mechanically continuous and. adequately protected against mechanical damage unless the said conductors are accessible only to an designated person or are installed and protected so as to prevent danger: · --- .. - -•-. - =--"--- . __ - ____ .-c __ '_c--:-.-·---· '2f17 ,THE GAZETTE OF INDIA : EXTRAORDINARY (PART III-SEc. 4) Provided that nonsmetallic conduits confonning to the relevant Indian Standard Specifications may be used for ins)allations of ,voltage not exceeding 650V:. (ii) all metal works, enclosing, su~rting· or associa~d with the installation, · other than that designed to serve as a conductCJr shallbe connected with an earthing system as per standards . laid down in the Indian Standards in this , regard and the provisions ofregulation 41. (iii) Every switchboard shall comply with the following,- .·· . (a) a clear space of not less than one metre inwidth.shall be provided : in front of the switchboard; (b) if there are any attachments or bare connections at the back of the switchboard, the space, ifany;•J:>ehind the switchboard shall be either less than twenty centimetres or • more than sevety five centimetres in width, measured from the farthest protruding part of any attachment or conductor; (c) if the space behind the switchboard exceeds sevety five centimetres in width, there shall be a passage way from either end of the switchboai:d, clear to a height of 1.8 metres. (iv) In case of installations provided in. premises where inflammable materials including· gases and chemicals are produ:ced, handled or stored, the electrical installations, equipment and apparatus shall coinply with the requirements of flame proof, dust tight, totally enclosed or any <>ther suitable type of electrical fittings depending upon the hazardous zones as per the relevant Indian Standard Specifications . . . (v) Where an application has been made to a supplier for supply of electricity to any installation, lie shall not commence the supply or where the supply has · been · discontinued for a period of six months and above, recommence the supply unless the consumer has complied with, in all respects the conditions of supply set out in these regulati<>ns. · (vi) Where a supplier proposes to supply or use electricity at or to recommence supply of voltage exceeding 250 V but not exceeding 650 V · after it has been discontinued for a period of six months, he · shall, before connecting or reconnecting the supply, give notice in writing 6f such intention to the E\ecm,cal Inspector. (vii)If at any time after conne,;,ting the supply,· the supplier is satisfied that any provision of these regulations are not being observed he shall give notice of ihe same in writing to the .consumer and the Electrical' Inspector, specifying how the provisions have not been observed and to rectify such defects in a reasonable time and if the consumer fails to rectify such detects pointed out, he may discontinue the supply after giving the consumer a reasonable opportunity F of being heard and recording reasons in writing and the, supply shall be discontinued only on written orders of an officer duly notified qy. the supplier in this behalf and shall be restored with all possible speed aft,er such defects are rectified by the consumer to the satisfaction of the supplier. 38. Appeal to Electrical Inspector in regard to defects.- (1) lf any applicant for a supply or a consumer is dissatisfied with the action of the supplier in declining to commence, to continue or to recommence ·the supply of electricity to his. premises on .the grounds that the installation is. defective or is likely to be dangerous, he may appeal to the Electricitl Inspector to test the installation and the supplier shall not, if the Electrical Inspector intimates that the installation· is free froin the defect or danger complained of, refuse supply tll the consumer on the grounds aforesaid, and shall, within twenty four hours after the receipt of such intimation from the Electrical Inspector, co=.ence, continue or recommence the supply of electricity. (2) Any test for which application has been made under sub regulation (1 ), shall be carried out within seven days after the receipt of such application.· 39. Precautions against failure of supply and notice of failures.- (1) The layout of tile electric supply lines of the supplier for .the supply of electricity throughout' his area of supply shall under normal working conditions be sectionalised and so arranged, and provided with .switchgear or circuit-breakers, so located, as to · restrict within reasonable Hmits the extent of the portion of the system affected by any failure of supply. · (2) The supplier shall take all reasonable precautions to avoid any accidental interruptions of supply, and also to avoid danger tci the public or to any-~.mployee or designated person when engaged on any operation during and in connection with the installation, extension, replacement, repair and maintenance of any works. (3) The supplier shall send to the Electrical Inspector a notice of failure of supply of such kind as the Electrical Inspector may from time to time require to be notifed to him, and such notice shall be sent by the earliest mode. of communication after the failure occurs or afterthe failure becomes known to the supplier and shall be in the Form given in Schedule-VI. (4) For the purpose of testing or for any other purpose connected with the efficient working of the supplier's installations, the supply of electricity may be . discontinued by the supplier for such period as may be necessary, subject to not less than twenty four hours notice being given by the supplier to all consumers likely to be affected by such di&eontinuance: / Provided that nosuch notioe shall be given in cases of emergency. 3747 Gl/10-27 TIIE GAZETTE OF INDIA : EXTRAO~INARY [PART Jll.---.SEC, 4] Safety provisions (or,electrical inst11Hations and appara~s ofyoltage ~ot exceeding 650 volts : 40. Test for resistance of Insulation.- (l) .Where any electxic s11cpplyJine. for use at ,voltages not exceeding 650 V has been disconnectefi from, a system for the purpose .ofaddition, alteration or repair, such electric. supplyJine. shall not be reco11Dected_ to ,.the., system until the supplier orthe owrtet has applied the test prescribed under regulation 33. - (2) 'J:he. provision under sub-regulation ( !)shall not apply to overhead lines except overhead insulated cables, unless the Electrical Inspector otherwise directs in any particular case .. 41. Connection ~ith earth.~ The following conditions shall apply to the connection with earth of systems at voltage normally exceeding 125 V but not exceeding 650 (i) neutral conductor of a 3-phase, 4-wire· system and the middle conductor of a 2-phase, 3-wire system shall be earthed by not less than two separate and distinct connections with a minimum of two different earth electrodes · or such large number as may be necessary to bring the earth resistance to a satisfactory value both at the generating station and at the sub-station. · (ii} the earth electrodes so provided, sh.all be .inter-connected to reduce earth resistance. · (iii} neutral conductor shall also be earthed at one _or more points along -'the'distribution system or service •line-in addition to any connection with earth which may be at the consumer's premises. · (iv) iri the case of a system comprising electric supply lines having concentric cables, the external conductor·of such cables. shall be earthed by two separate and distinct connections with earth; ·- (v) the connection with earth may include a link by means of which the connection may be temporarily interrupted forthe purpose of testing or for - (vi)" in a direct current three wire system, the mid.die conductor shall be earthed at the generating station only,,.at1q\,th.e,current from the middle conguctor to earth shall be continuously recorc\eci by means of a recording amtneter, and if at any time the current exceeds one~thousaudth part of the maximum ~upply _ current, immediate steps-,shit\1 be taken_ to improve the insulation of the ,system, - - · · (vii) where the middle conductor is earthed by·means of a circuit breaker with a resistance connected in parallel, the resistance shall not exceed ten ohms and on the opening of the circuit breaker, immediate steps shall be ' i taken to improve the insulation of the system, and the circuit breaker shall be reclosed as soon as possible. (viii) the resistance shall be used.only as a protection for the ammeter in case of earths on the system and until such earths are removed and immediate steps shall be taken to locate and remove the .earth. · (ix) in·the case of an alternating curtent system, there shall not be inserted in the. connection with earth any impedance, other than that required solely for the operati011;ofswitchgear or instruments, cUt-oU:t or circuit breaker, and the result of any test made·to ascertain whether the current, if any, passing through the connection with earth is normal,· shall be duly recorded by the supplier, · · · · (x) no person shail make connection with earth by the aid of, nor shall he keep it. in contact with, any water mains not belonging to him except with the consent of the ownertheteof and of the Electrical Inspector. (xi), alternating cutrerit sjstems which are connected with earth as aforesaid shall be electrically interconnected: · Provided that eiich. connection with earth is bonded to the metal sheathing and metallic annouring, if any, of the electric supply lines ,concerned. · (xii) the frame of every generator, stationary motor, portable motor, and the metallic piirts, n6t intended as conductors, of all transformers and any other apparatus 11sed: for regulating or controlling electricity, and all electricity consutnirig 'apparatus, of· voltage exceeding 250 V. but not exceeding 650 V shall'~ earthed by'the owner by. two separate and distinct connections with earth. (xiii) neutral point of every generator and transformer shall be earthed by connecting it to the earthing system by not less than two sepeartt and distinct connections. · · (xiv) all metal casing or metallic coverings containing or protecµng \ny electric supply line cir apparatus shall be connected with earth and shall be so joined and conn~$ed acros~ allju~qn)iox:es and other openings as to length: . l'rcivic/.ed that vonditi!)l)S mentioned in this regulation shall not apply, where the supply voltage does not exceed 250 V and the apparatus .. consists of wall tubes or brackets, electroliers, switches, ceiling fans or · other fittings, other than ,portable hand lamps and portable and transportable apparatu.i;, unless PWvi\ied with earth terminal and to class-II apparatus and appliances: · · • . Provided further that where the supp1y voltage is not ~xceeding 25.0 V and. ,where the installations are either new or renovated, all plug sop.kets shall be of the three pin type, and the third pin shall be permanently and efiiciently·earthed. (xv) All eartlring systems shaU, -, . {a) consist of equipotenti~lbonding cimduciors capable of carrying the ·Prospective e_arth fault current. and a group of pipes, rods and plate electrodes for dissipating the current tq the general mass of earth without exceeding the allowable temperature limits ,as per relevant Indian Standards in order to maintain 'all non,current · cmying metal works reasonably ·at earth potential and to avoid dangerous contact potentials being developed on suc)l metal works; (b) limit earth resistance sufficiently low. to permit adequate .fault · _current for the operation of protective devices in time and to' reduce neutral shifting; . . .• i •• . " . . . . (c) be mechani~ally strong, withstand. co~siori and retain electrical . continuity during the life of the installation and all earthing systems . shall be tested to ensure efficient earthing, before the electric supply lines or apparatus are energised. · (xvi) all earthing systems belonging to the supplier shall in addition, be tested for resistance on dry day during the dry season not less than once every two years. · (xvi.i) a record of every earth test made and the result thereof shall be kept by the supplier for a period of not less than two years after the day of testing and shall be available to the Electtical_Inspector when required. Explanation:- The expression •icJass-11 apparatus . and' appliance" shall have the same meaning as is assigned to it in the releyant Indian Standards. 42. F tarth leakage protective device. - The supply of electricity to every electrical ;installation other than voltage not exceeding ;250 V below 5 kW and those installations of voltage not exceeding :250 V which do not attract provisions of section 54 of the Act, shall be controlled by an earth leakage protective device so as to disconnect the supply instantly on the• occurance. of <'lUth fault or leakage of current: · · Provided that such earth leakage protective device shall not be required for overhead supply lines having protective devices. wWch, are effectively bonded to the neutral of supply transfonneni and conforming to regulation 73. - . - . , . . . .' . . ' L ['ll'l 111-= 4] Chapter VI Safety provisions for electrical installations and apparatus of voltage exceeding 650 volts · 43. Approval by Electrical Inspector. - (!) Voltage above· which electrical installations will be required to be inspected by the Electric.al Inspector before commencement of supply or recommencement after shutdown for six months and above shall be .as per the n9tification to be i_ssued by the Appropriate Government, under clause (x) of sub-se.ction _{2) ofsection 176, ,and sub-sect.ion (I) of sec.lion 162 of the Act. (2) Before making an application to the ·Electrical Inspector for permission to c_ommence or recommenc~. supply ,after an installatiqn -ha~ be.en .disconnected for six months and above at voltage exceeding 650 V to any person, the supplier shall ensure that electric supply lines· or apparatus of voltage_ exceeding 650 V belonging to him are placed in position,properlyjoined and duly completed and examined and the supply of electricity shall not be commenced by the supplier for . installa.tions of voltage'. needing inspection under these regulations unless the provisions of regulations 12 to 29, 33 to· 35, 44 to 51 and 55 to 77 have been complied with and the approval in writing of the 'Electrical Inspector has been obtained by him: Provided that the' supplier may energise the aforesaid electric supply Jines or apparatus for the purpose of tests specified in regulation 46. · (3) The owner of any instal_lation of voltage exceeding '650 V shall, before making application to the Electrical Inspector for approval ofhis installation or additions thereto;· test every circuit of voltage exceeding 650 V or additions the.re!o, other than an overhead line, and satisfy himself that they withstand the applicittion of the testing voltage set out in sub-regulation (!) of regulation 46 and shall duly record . the results of such tests and forward them to th.e Electrical Inspector: Provided that anitlectrical lnspector may direct such owner to carry out such tests as he deems neces.sary or accept the ,manufacturer's certified te~.ts in respect of any particular apparatus in place of the tests required by this regulation . (4) The owner of any installation of voltage exceeding 650 V who makes any addition or alteration to his installation shall not'cortnect · to the supply liis 'apparatus or electric supply lines., comprising the said alterations or additions unless and until such alteration or addition has been _approved in writing by the Electrical Inspector, · shall ifo.t authorise the supplier to commence supply cir where the supply has been · discontinued for a period of six mc;,rtths and above, to recomrnence the supply at voltage exceeding 650Y to any consumer unless-. . . - . . . . . . (i) all· conductors 'arid apparatus situated on the premises of the consumer are so placed as to be inacces_sible ex~ept to a designated person 1HE GAZETTE OF INDIA: EXTRAORDn-{ARY [PART III:-,SEC. 4} and all operations in connection with the said conductors and apparatus are carried out l>y a designated person; · (ii) ·· the consiimet has provided ~itd agrees to ll1llintaift a·sepatate building or a locked weather proof and'fire proof enclosure· of agreed design and location, to which the supplier at all times shall have access for the purpose of housing his apparatus and metering equipment, prwheriicthe· provision for,a separate building or enclosure is impractical;,le,•Jll.it,i:1msumer has segregated the aforesaid apparatus of the supplier from any. o~er part of his own apparatus: · · ;r Provided that such segregation shall be by the .provision of fire proof walls, if the Electrical Inspector considers it io be necessary: ' 'Provided further that in the case. of,ari outdoor installation the ·consumer shall suitably segregate thlfafotesilia apparatus,belonging to the ''suj,'plierfromhis own; · · " · (iii) all pole type sub-stations are constructed and maintained in .. accordance with regulation 50. , (2)The owner shall observe the following conditions, where'ele~tricity at voltage exceeding 650 V is supplied, converted, transforme~ or u~e~,- . • s ·.- ·.-.,_., .. c ·.,, (i) . he shall maintain safety clearances for· electtlcafapparatus as per . Bureau.· of Indian Standard specification'. 'so thaf , sufficient space is availa.ble for easy operation and maintenance· without· any, hazard to the operating and maintenance personnel working near' the equipment and for ensuring adequate ventilation; · · · · · (ii) he shall not allow any encroachment below such installation: -- · .... -- Provided that where the Electrical Inspector-comes across any such encroachment, he shall direct the owner to remove such encroachments; (iii) the minimum safety working clearimce§'speeified ii(-Sched11le~v11 · shall be maintained for the bare conductors or live parts of any apparatus in outdoor sub-stations excluding overhead lines'of fo.stallatfons of voltage · exceeding 650V;. . .· · . . >, ... _,. ' ·- (iv) he shall ensure that the windfo.gs of_ motors or other apparatus within , .. reach from any position in which a person may require to be, are suitably · protected so as to prevent danger; ' {v) '_he shall ensure that where ii tramforniefoi'transforniers are used, suitable provisio1' shall be made, either ofcorinectin!fwith earth; a point of · the circuit'at the lower voltage or othetWise?t<fguard• against danger by reason of the said circuit becoming accidentally charged above its normal voltage by leakage from or contact with the circuit atthe higher voltage; • J-: (vi) a sub-station or a switching station with apparatus having more than 2000 litres of oil shall not be located in the basement where p1oper oil draining arrangement cannot be provided; (vii) where a sub-station or a switching station with apparatus having more than 2000 litres of oil is installed, whether indoor or outdoors, he shall take the following measures, namely:- (a) the baffle walls .of four hours- fire rating shall be provided betw1:en the apparatus,-. (i) .where there is .a single phase transformer banks in the switch-yards of generating stations and sub-stations; (ii) on the c011SiuI1er premises; (iii) where adeqllllte clearance between the units is . not (b) ptovision~";kn·oe niade forstiitable oil soakpit and where use of more than 9000 jitres of oil in any one oil tank, receptacle or chambei'\s involved, prcivisiori shall be made for the draining away or removal ol' any oil which may leak or escape from the tank, receptacle or chamber containing the s111I1e, and special precautions shall be taken to prevent the spread of any fire resulting from the ignition of the oil from any cause and adequate provision shall' be made for extinguishing any fire which may occur; ( c) spare oil shall not be stored in the vicinity of any oil filled equipment in any such stib~station or switching station; . ( d) all the transformers and switchgears shall be maintained in accordance with the maintenance schedules prepared in accordance with the relevant codes of practice of Bureau of Indian Standards; (e) dry type of transformers only shall be used for installations inside the residential arid commercial buildings; (viii) without prejudice to theabove•measuresthe shall take adequate fire protection arrangement for quenching the fire in the apparatus; (ix) he shall.ensure thaf the transformers of 10 MVA and above rating or in case of oil filled transformers with oil capacity of more than 2000 liters . are provided with fire fighting system its per IS - 3034: 1993 or with -Nitrogen Injection Fire Protection syst~m; . · (x) where it is necessary to locate the sub-station, or switching station in the basement, he shall take the following measures, namely:- 2is (a) the room shaff necessarily be in the first basement at the periphery of the basement; · (b) the entrances to the room shall be provided with fire resisting doors of 2 hour fire rating and the door shall always be kept closed and a notice of this effect shall be affixed on outer side of the door; ( c) a curl? ( sill) of a suitable height shall be pr,ovided at the entrance in order to prevent the flow of oil from a ruptured transformer into other parts of the basement; (d) direct access to the transformer room shall be provided from outside and the surrounding w11lls shaUJ,e lined with fire bricks; (e) the cables to prynary side and secondary . side shall have sealing at all floors and wall opening of atleast two hours rating; ( f) fire Retardent Low Smoke (FRLS) cable of two hours rating shall be used. · · (xi) he shall ensure that oil filled transformers installed indoors in other than residential or commercial buildings are placed at the ground floor or not below the first basement; (xii) he shall ensure that cable , trenches inside the. sub-stations and switching stations containing cables are filled with sand, pebbles or similar non-inflammable materials or completely covered with non-inflammable slabs; (xiii) he shall ensure that unless the conditions are such that · all ihe conductors and apparatus may be made dead at the same time for the purpose of cleaning or for other work, the said conductors and apparatus shall be so arranged that these may be made dead in sections, and that work on any such section inay be carried on by a designated person without danger; (xiv) only persons designated under sub-regulation (1) of regulation 3, shall carry out the work on live lines and apparatus. (3) All apparatus shall be protected against lightning and apparatus exceeding 220 kV shall also be protected against switching over voltages. · · (4) The equipment used for protection and switching shall be adequately co­ ordinated with the protected apparatus to ensure safe' operation and to maintain the stabilitfof the iriter-cotinected units of the power ~ystem. · · · (5) The minimum clearances specified in Schedule:VIII shall be maintained for bare conductors or live parts of any apparatus _in outdoor sub-stations, excluding overhead lines of High Voltage .Direct Current installations. ~[~.III:;-,~4] 66 kY'md above class of lines. . . . . - . ;_s;._- • ' .. -'.' J ·'. ., • ----•_, ; ' ·,'"·'·'·'. _-.,. '.. • ,.'' -·,·_, ,·' '"' •. (i) isolators and the ·controlling circuit breakers sha!Fbe inter,locked so locked so that no earthing· switch can lie closed unless and until 'the supplies shall be inter-locked to prevent possibility of any :inadvertent. should iie ensured before any person comes in close proximity ofcsuch . __ p~;-,-:. :~,..-::,~~-; "' '., :;· ':/~-,--.,_; .,·-11· __ ;:-;q·_~-;;: switching is adopted, inter-lock shall be provided to ensure that,generator breaker cannot be closed uniess one of the neutrals 'is connectetLto •the earthing .system. . automatically disconnect the supply under abnormal.conditions, namly:- (ii) earth fault or earth leakage protection to disconnect the supply . , aut9l1111tically ;if th1:1 eiirth , fault cµrrent exceeds 1the, ,limit of ,curtent' for , " .. ketsPingthe contactpotentiahwithin the reasonable values;· (iii} gas pressure type and winding and oil temperature.protection to give alami. and ,n:ipping ~hall be provided on all transformers ,.of rating~ 1000 (iv) transformers of capacity 10 MVA aµd :abov.e shall be protected against incipient faults by differentiar protection; 3747 Gl/10-,.28 (v) all generators with-rating of 100 KVA and above shall be protected against earth fault or leakage; · (vi) all generators of rating 1000 KV A and above shall be protected against faults within the generator winding using restricted earth fault . protection or differential protection or by both; (vii) high speed bus bar differential protection along with local breaker back up protection shall be commissioned and shall always be available at all 132 kY and above voltage sub-stations and switching stations and · g~rierating stations connected with the grid: Provided that in respect of existing 132 kV sub-stations and switchin[; stations having more than. one incoming feeders, the high speed bus bar • differential protection along with local breaker back up protection, shall be •' 'commissioned and shall always be available; (viii) every generating station and sub-station connected to the grid at 220 kV and above shall be provided with disturbance recording and event logging facilities and all such equipment shall be provided with time ·synchrortization facility for global common time reference but wherever numerical relays·. wiih provision of recording fault data are installed, disturbance recorder and event logger may not be installed; (ix) distance protection and carrier communication protection shall be · provided for all lines connecting to400/220 kV substation. 46. Testing, Operation and Maintenance.- (1) Before approval is accorded by the Electrical Inspector under regulation 43 the manufacturer's test certificates shall, if required, be produced for all the routine tests as required under the relevant Indian Standards. (2) No new apparatus, cable or supply line of voltage exceeding 650 Volts shall be commissioned unless such apparatus, cable or supply line are subjected to site tests as per relevant code of practice of the Bureau of Indian Standards. (3) No apparatus, cable or supply line of voltage exceeding 650 V which has been , • kept disconnected, for a period of six months or more, from the system for -, alterations or-repair, shall be connected to the system until such apparatus, cable or supply line are subjected to the relevant tests as per code of practice of Bureau of Indian Standards . . (4) Notwithstanding the provisions of this regulation, the Electrical Inspector may require certain tests -to be carried out before or after charging the installations. (5) All apparatus, cables and supply lines shall be maintained in healthy conditions and tests shall be carried out periodically as per the relevant code of practice of the Bureau oflndian Standards. ( 6) Records of all tests, trippings, maintenance works and repairs of all equipments cables and supply lines shall be duly kept in such a way thatthese records can be compared with earlier ones . (7) It shall be the responsibility of the owner of !II\ installations of voltage exceeding 650 V to maintain and operate the installations.in a conc\itionfree from danger and as recommended by the manufacturer or by the relevant codes of practice of the Bureau oflndian Standards. (8) Failures of transformers and reactors of 20 MVA or MVAR and higher capacity shall be reported by the co11sumer and the suppliers of electricity, within forty eight hours of the occurre11ce of the failure, to the Central Electricity Authority and the reasons for failure a11d measures to be taken to avoid recurrence of failure shall be sent to the Central Electricity Authority within one month of the occurrence in the format given in Sc)ledule-IX . 47: Precautions to· be taken agai11st excess leakage in case of metal sheathed electric supply lines.- The following precautions shall be tal\:en in c,a,se of electric supply lines other t)lan overhead )i11es, for use at voltage exceeding 650 V;. namely:- · (i) the conductors of the cable except the cable witb t)l~9119plastic insulation without any metallic screen or ~rtnour shall be enclos~d in metal sheathing which shall be electrically continuous and co11Dected with earth, and the conductivity of the metal sheatbing shall be maintained and reasonable precautions taken where necessary to avoid corrosion of tbe sheathing; · (ii) tbe resistance of the earth co11Dection with metallic sheatb shal\ be kept low enough to permit the controlling circuit breaker or cut-out to· 9p\'lrate in the event of any failnre of insulation between the metallic sheafu' and the conductor. Explanation- For the purpos_e of this regulation;._ -· ', - (ii) in the case of thermoplastic insulated and ~heathed cable_s with metal)ic armour the metallic wire or tape arm9ur, shall be considered as metal sheathing. (b) where an electric- supply line as aforesaid has concentric cables and the external conductor is insulated from an outer metal sheathing and connected with earth, the external conductor may be regarded as the metal sheathing for the purposes of this regulatio11 provided that the foregoing provisions as to conductivity are complied with. Connection with eartl\ for apparatus exceeding 650V.- (I) A.llpon-current carrying metal parts associated with an installation of voltage exceeding 650 V' shall be effectively earthed to a grounding system or mat which shall,- . (i) limit the touch 'a11d step potential to tolerable values; THE GAZETIB' OF'fNDiA:': ·EXTRAORDINARY 'i(ii}';" ' llmiHhe ~lllld"potential rise to tolerable values,so·as .• to prevent danger · ·. , pipe:lines, etc.;. "(iiiY,' maintam,tJieJ resistance· of, the earth;connection,to, such a .value ,as to•. Provide<Lthat the neutral poi~t cil ieiieriifoi-ukYlle borlnected td'the. · " elm.bing· ~ystemthrough ~ impedance to limit the fault current to the earth: .. . ... Pto:yided futthef'.thatHri the-1 case of multi-machine · systems neutral current;circulation:,in,the system; th e• neutral . _· by the ,inserti()!l:ofa ,gi-ounding tran_sformer . and c.lllTent _ liniiting resistance (l) In case of generating; stations,. sub-stations. and industrial installatioiiS of wltage. exceeding 33 kV;. the system neutral earthing and protective frame eartliing may be, if; system. design so wattarits,' fotegriited into comnioif earthing gri4;prQYidl:ld the resistance to earth of combined mat does not .cause the step and · ·, n - ,._, - .- ·, __ ·· __ ._l -·-• .,.. ,,\,>_> ·, · ---~- · ·---- ---- , · ·•- cablei.tlie extemiit'conductor sllairlle connected witli earth. . -· · · · "· ·. · . · ·· voltage exceeding 650 V which has not hitherto been s6 connected with· earth; he · smiR!l,i,re. ~Qt;less · than f~ep «4Ys notice in 'Nii ting together with particulars of , (7) Where the earthing,l¢ad:.~.~,conn,ectio11 are µsc,:d,oµly iI\ connection with earthing guards erected under overhead lines of voitag,e. exceeding • 650 V • where they cross a. telecommunication line or a railway line, and where such lines are equipped:. with earthdeakage, the earth resistance slia11 not excead twenty five . ---=-------·'---- -- - -~--- - - - ----=-------==---c=------------ ---- --- ------·-·-======~~= 'ohms and the projecfaiithotities shall obtain No Objection Certificate (NOC) from ' · Railway Authorities and Power and Telecommunication Cci~ordination'Colfimittee 'l>efoh, ellei:gisa.ticin Of the facilities; ' . . . . . ts>' :E~ery 'eattiiing system befongiitg to either the SUppHeror tli~ consurtier shall . be tested for its resistance to earth on a dry day during dry season' not· less than ,.o,nc~ .a yelll" 1111d records of suchtests: shall be. maintained and produced, if so 49." Geiietal' condltlcjnS. as to transformation' and· control of •electricity,;; ··(J) Where . electricity of voltage ·exceeding' 650 V is ~nsformed,' converted, regulated or otherwise controlled in sub~stations or switching stations includin,g outdoor sub­ . stations' and outdoor switching stations to lie transfornied'of in street boxes ··constructed underground, the'foilowing provisions shall· be'observed, riatriely:- (i) ·sub-stations,and' switching'statforis sha!F'preferably' be 0 erected above ground, but where necessarily co!lstfucted'linaergroui:id due provisions for yentilation and drainage shall be made_ and any space housing switchgear shall riot be used 'for storage df any materials 'especially inflammable and ,' ~Ombtistible materials or iefuse; ' . . . .•.. . .. . . (ii) outdoor sub-stations except pole type stib•sfuticms and outdoor switching stations shall, unless the apparatus is completely enclosed in ~. metal covering .... ' •. i::orinei:ted wlth earth; the said. apparatus' also oeing connected with the system by armoured cables, be efficiently' protected b)' fencing not less than 1.8 metres in height or other means so. as to prevent access to the electric supply Hnes arid apparatus therein by an tindesignated person and the fencing of such . ' area shall be earthed efficiently; . . . . . · ... •. ' ' (iii)underground 'street ooxes, other 'than Sl\b'stations, which contain trarisforrriei:s shall not coittain switchesor·other apparatus, .. and switches, cut' outs or other apparatus required 'for 'coriirollirig of otherplirposes shall be fixed in separate receptacle above ground wherever practicable . . - • '."-c , ' • . ' :,-;•; ;: . •. (2)' Where 'electricity is transformed/ suifa'ble connection' shall be made by connecting with earth a, point of the system at the lower voltage and also to guard a'gainst•diingerby reason Of,the said system tiecortJ.iiigaccidentallychatged above 'its hernial •voltage 'by leakage frotn a contact with' the system at' file 1Hgher voltage. ·•·· -a ;" •. ,. . • .· ', ' . , 50. Pole type sul:1-stations.- Where platform type construction is used fot a pole type sub-station.and.sufficient space, for a person to stand on thepl~tform is provided, a slibsfa'ntiiif!hartd rail'shall be bililt'atiiurid the said pfatform and if the hand rail is of metal, it shalr be connected with faith: Provi_ded that in the case of pole type sub:station on wooden supports and . Wobdefi platform the niefa'lharidirail sha1! no foe coimect~d whh e~rth, . · 5V Conderisers.0 :Stiifa'bl~ 'arrarigementilhall be fuade' for immediate and automatic or manual discharge of every static coridenser'ondisconnectiori of supply. 222 urn GAZETTE OF INDIA : EXTRAORDINARY [PART III-SEC. 4] 52. Supply to luminous tube sign installations of voltage exceeding 650 Volts but not exceeding 33 kV,- (1) Any person who proposes to use or who is using electricity for the purpose of operating a luminous tube sign installation, or who proposes to transform or is transforming electricity to a voltage exceeding 650 V but not exceeding 33 kV for any such purpose shall comply with the following conditions, namely:-. (i) all live parts of the installation, including all apparatus and live · conductors in the secondary circuit, but excluding the tubes except in the neighbourhood of their terminals, shall be inaccessible to undesignated persons and such parts shall be effectively screened; (ii) irrespective of the method of obtaining the voltage of the circuit which feeds the luminous discharge tube sign, no part of any conductor of such circuit shall be in metalli.c connecti<m, except in respect of its connection with earth, with any conductor of the supply system or with the primary winding of the transformer; · (iii) all live parts of an exterior installation shall be so disposed as to protect them against the effects of the weather and such installation shall be so arranged and separated from the surroundings as to limit, as far as possible, the spreading of fire; (iv) the secondary circuit shall be permanently earthed at the transformer an.d the core of every transformer shall be earthed; · (v) where the conductors of the primary circuit are not in metallic connection with tile supply conductors, one phase of such primary circuit shall be permanently earthed at the motor generator or convertor, or at the transformer and an earth leakage circuit breaker of sufficient rating shall be provided on the side of voltage not exceeding 250 V to detect the leakage in such luminous tube sign installations; . (vi) a sub-circuit which forms the primary circuit of a fixed luminous discharge tube sign installation shall be reserved solely for such purpose; (vii) a separate· primary final sub-circuit shall be provided .for each transformer or each group of transformers having an aggregate input not, exceeding 1,000 volt-amperes, of a fixed luminous discharge tube sign installation; · (viii) an interior installation shall be provided with suitable adjacent means for disconnecting all phases of the supply except the "neutral" in a 3-phase, · (ix) for installations on the exterior of a building !!- suitable emergency -fire-proof linked switch to operate on ~l phases except"the neutral in a 3- phase, 4-wire·circuit shall be provided and fixed in a conspicuous position at not more than I; 70 metres above the ground; · =="'"· '-=--=c---====~===========~~~~-~===========~ - -·--- \ I , [ '1'111 Ill-~ 4) (x) a special "caution" notice shall be affixed in a conspicuous place on · the _door of every enclosure of voltage· exceeding 650 V but not exceeding 33 kV to the effect that the supply must be cut off before the enclosure is opened; (xi) where static 9ondensers are used, they shall be installed on the load side of the fuses and the primary side of the transformers where the voltage does not exceed 250 V; · (xii) where• static condensers are used on primary side, provision shall be made for automatic or manual discharging of the condensers when the supply is cut off; · (xiii) before using the static condensers or any interrupting device. on the voltage exceeding 650 V, the executing agencies shall test and ensure that automatic discharging device is functional thereon . (2) The owner or user of any luminous tube sign or sh;nilar installation of voltage exceeding 650 V but not exceeding 33 kV shall not bring the same into use without giving to the Electrical Inspector not less than fourteen days notice in writing of his intention so to do. 53. Supply to electrode boilers of voltage exceeding 650 Volt but not exceeding 33 kV.- (1) Where a system having a point connected with earth is used for supply of electricity to an electrode boiler of voltage exceeding 650 V which is also connected with earth, the owner or user of electrode boiler shall comply with the following conditions, namely:- (i) the metal work of the electrode boiler shall be efficiently connected to the metal sheathing and metallic armouring, if any, of the electric supply line of voltage exceeding 650 V but not exceeding 33 kV whereby electricity is suppied to the electrode boiler; (ii) the ~upply of electricity at voltage exceeding 650 V to the. electrode ·boiler shall be controlled by a suitable circuit-breaker so set as to operate in the event of the phase currents becoming unbalanced to the extent of ten per cent of the rated current consumption of the electrode boiler under normal conditions of operation: Provided that if in any case a higher setting is essential to ensure stability of operation of the electrode boiler, the setting may be increased so as not to exceed fifteen per cent of the rated current consumption of the electrode boiler under normal conditions of operation; (iii) an inverse time element device may be used in conjuction with the aforesaid circuit breaker to prevent the operation thereof unnecessarily on the occurrence of unbalanced phase currents of momentary or short duration; (iv) the supplier ot owner shall serve a )lotice in writing on the telegraph­ authority at least seven days prior to the date on which such supply of electricity is to be afforded specifying the location of every point, including TIIB GAZETIE•OF INDIA: EXTRAORDINARY the earth connection oLthe electrode boiler, , at wllich the system is connected with earth,· not bring the same into use without ,giving the Electrical Inspector ricitless thari fourteen days notice in writing ofhisi;nti:;ntion soto .do. , Supply to X-ray and high frequency installations .. - {I) Ally person, who proposes to use or who is using electricity for the purpose of operating'an X-ray · or simila,r high,frequency i,nstailation, other .than. portab\e units or shock-proof . self ,contained, and stationary, ut1its shin· comply· thi. fol10Wi1lg conditions, · namely:- , (i} mechanical .barriers sha!L be provided to prevet1t too close an approach to any parts. ofthe X-ray apparatus of voltage exfoedirig 650 V but not exceedingJ3 k.V, ex.cept theX~ray tube an.dits leads, llnless such parts of voltage exceeding 650. V but not. exceeding '33' kV l!ave been rendered, shock . proof by , being shi<;lded .· by earthed metal or adequate insulating material;. · · · · · · (ii) where generators operating at 30Q kV'peakN.inore ;rfµsetsuch · generators shall be installed in rooms separate from 'those contairilng' the ·, other equipment and. any>step-up •transforn:ie.r employed .shall be so installed and protected as topreveriLdanger; . ' · · · · · . (iii) a s~itable switch' shall be pr()yided to control ti!~ cir~ul~tipilying a generator, and shall be so ananged.asto be Clperi except while the door of the room housing the generator is locked from the· ciutsid;; · · · · · ·· · · ·. (iv) X-rny tubes used in therapy shall be mount~cl fo. ~11earthed metal .- enclosure;.. . - , " , - . . . ' (v) every X-ray machine shall be provided with a millialll!llelei' or other suitable measuring.instrum~nt, readily visible from the con)l;ol position and ·• connected, if practicable; in the earthed lead, but gµarded 1f cCJnhected in thdead of voltage exceeding 650 V but not exceeding 3\kV: · · · Provided. that earth leakage circuit ~reak.er of..suffici1mt rating shall be provided on the side wherein voltage does not exceed 1so'V to.detect ·•. the leakage in such X-ray installations. to X-ray and high-frequency equipm;,;nt, shiill m"'()TT il)aL~~ch ~quipment is guarded with earthed metal so t!iat no person may come into contact with . _ any live part, · · (2) (i) in the case of ~onshock proof equipment, ovethkad conductors of voltage exceeding 6.50 V but not exceeding 33 kV, unlesssuifalily guarded against personal contact, shall be adequately spaced and high voltage leads on tilting tables a;nd fluroscopes . sl],aH. be adequate1y insulated or so · ~unounded by baniers as to prevent jna(jvertet1t co~}act; · ['11'1IIl~~4] (ii) the circuit of voltage not exceeding 250 V of the step up transformer shall contain a manually · operated control device having overload protection, in addition to the over current device for circuit protection, and these devices shall have no exposed live parts and for diagnostic work there shall be an additional switch in the said circuit, which shall be of one of the following types:- (a) a switch with a spring or other mechanism that will open . automatically except while held close by the operator, or; (b) a time switch which will open automatically after a definite. period of time for which it has been set; (iii) if more than one piece of apparatus be operated from the same source of voltage exceeding 650 V, each shall be provided with a switch of voltage exceeding 650 V to give independent control; · (iv) low frequency current-canyihg parts of a machine of the quenched­ gap or open gap type shall be so insulated or guarded that they cannot be touched during operation but the high frequency circuit-proper which delivers high-frequency current normally for the therapeutic purposes shall be exempt·from such insulation; (v) all X-ray generators having capacitors shall have suitable means for discharging the ca~acitoni manually; (vi) except in the case of self-contained units, all 200 kV peak or higher X-ray generators shall have a sphere gap installed in the system of voltage exceeding 650 V but not exceeding 33 kV adjusted. so that it will break down on over voltage surges. (3) (i) all non-current carrying metal parts of tube stands, fluroscopes and · other apparatus shall be properly earthed and insulating floors, mats or platforms shall be provided for operators in proximity to parts of voltage exceedi11g 650V unless such parts have been rendered shock proof; (ii) where short wave therapy machines are used, the treatment tables and examining chairs shall be wholly non-metallic. (4) The owner of any X-ray installation or similar high frequency apparatus shall not bring the same into use without giving to the Electrical Inspector not less than fourteen days notice in ,vriting of his intention to do so: Provided that the aforesaid notice shall not be necessary in the case of shock-proof portable. X-ray and high-frequency equipment w½tic_!i have been inspected bdore the commencement of their use and periodically thereafter. 3747 Gl/10-29 226 TIIE GAZETTE OF INDIA: EXTRAORDINARY Chapter VII Saf!!ty requirements for overhead lines, underground cables and generating stations [PART III-SEC. 4] 55. Material and strength.- (1) All conductors of overhead lines other than those specified in regulation 68 shall have a breaking strength ofnotless than 35Q kg. (2) Where the voltage_ does not exceed 250 V and the span is of less than fifteen metre~ and is drawn through the owner's or consumer's premises, a conductor having an actual breaking strength of not less than 15.0 kg may be used. 56. Joints.- (I) No conductor of an overhead line shall have more than one joint in a span and joints between conductors of ovemead lines shall be mechanically and electrically secure under the conditions of operation. (2) The ultimate strength and the electrical conductivity of the joint shall be as per relevant Indian Standards. 57, Maximum stresses and factors of safety.- (I) The load and permissible stresses on the structural members, cohductors and ground wire of self supporting steel lattice towers for overhead transmission lines shall be in accordance. with the specifications laid down, from time to time, by the Bureau oflndian Standards. (2) Overhead lines not covered in sub-regulation (I) shall have the following mbimum factors of safety, namely:- (i) for metal supports 1.5 (ii) for mecha11ically processed concrete supports 2.0 (iii) for hand-moulded concrete supports 2.5 (iv) for wood supports 3.0 (3) The minimum factors of safety shall be based on such load as may cause failure of the. support to perform its function, assuming thatthe foundation' and other components of the structure are intact. (4) The load shall be equivalent to the yield point stress or the modulus of rupture, as the case may be, for supports subject to bending and vertical loads and the crippling load for supports used as strut. (5) The strength of the supports of the overhead lines in the direction of the line shall not be less than one-fourth of the strength required in the direction transverse to the line. (6) The minimum factor of safety for stay-wires, guard-wires or bearer-wires shall be 2.5 based on the ultimate tensile strength of the wire. (7) The minimum factor of safety for cnndvctors shall be two, based on their ultimate tensile strength, in addition, the conductor's tension at 32° C, without external load, shall not exceed the following percentages of the ultimate tensile strength of the conductor:- (i) (ii) Initial unloaded tension Final unloaded tension 35 per cent _25 per cent Provided that for the conductors having a cross section of a generally triangular shape, such as conductors composed of 3-wires, the final unloaded tension at 32° C shall not exceed thirty per cent of the ultimate tensile strength of such conductor. (8) For the purpose of calci,lating the factors of safety in sub-regulation (2), the following conditions shall be observed, namely:- (i) the maximum wind pressure shall be as specified in the relevant Indian Standards; (ii) for cylindrical .1, die, the effective area shall be taken as full projected . area exposed to wind pressure; and (iii) the maximum and minimum temperarures shall be such as specified in the relevant Indian Sta.11dards. (9) Notwithstanding anything contained in sub-regulation (2) to (8) in localities where overhead lines are liable to accumulations of ic,e or snow, the load and permissible stresses on the structural members, conductors and ground wire of self supporting steel ·lattice towers _ for overhead transmission lines shall be in accordance with the specifications laid down, from time to time, by the Bureau of Indian Standards or as specified by Appropriate Government, by order in writing. Clearance above ground of the lowest conductor of overhead lines.- (1) No conductor of an overhead line, including service lines, erected across a street shall at any part thereof be at a height of less than- (i) ' for lines of voltage not exceeding 650 Volts - 5.8 metres (ii) for lines of voltage exceeding 650 Volts but not ex~eeding 33 kV· · 6.1 metres (2) NQ conductor of an overhead line, including service lines, erected along any street shall at any part thereof be at a height less than- (i) for lines of voltage not exceeding 650 Volts - 5.5 metres (ii) forlines of voltage exceeding 650 Volts but not exceeding 3 3 kV 5. 8 metres (3) No conductor of an overhead line including service lines, erected elsewhere than along or across any street shall be at a height Jess than - (i) for lines of voltage upto and including 4.6 metres (ii) for lines of voltage upto and including 4.0 metres 11,000 Volts, if insulated (iii) for lines of voltage exceeding 11,000 Volts - but not exceeding 33 ~V 5.2 metres 'J27 .J (4) For lines of voltage exceeding 33 kV the clearance above ground shall not be less than 5.2 metres plus 0.3 metre for every 33,000 Volts or part thereof by which the voltage ofL'l.e line exceeds 33,000 Volts; Provided that the minimum clearance along or across any street shall not be less than 6.1 metres. (5) For High Voltage Direct Current (HVDC) lines, the clearance ab9ve ground shall not be less than:- 200kV 300kV 400kV 500kV 600kV 800kV (6) Ground clearances shall be as specified in schedule-X. 59. Clearance between conductors and trolley :wires.- (1) No conductor of an overhead line crossing a tramway or trolley bus route using trolley wires shall have less than the following clearances above any trolley wire- (i) lines of voltage not exceeding 650 Volts 1.2 metres Provided that where an insulated conductor suspended from a bearer wire crosses over .a trolley wire the minimum clearance for such insulated conductor shall be 0.6 metre. (ii) lines of voltage exceeding 650 Volts LR metres up to and including 11,000 Volts (iii) lines of voltage exceeding 11,000 Volts 2.5 metres ' but not exceeding33,000 Volts (ivJ lines of voltage exceeding 33 kV 3.0 metres (2) In any case of a crossing specified in ~ub-regulation (1), whoever lays his line later in time, shall provide the clearance between his own line and the line wbich will be crossed in accordance with the provisions of the said sub-regulation: Provided that if the later entrant is the owner of the lower line and is not able to provide adequate clearance, he shall bear the cost for modification of the upper line so as to comply with this sub-regulation . . L,_ -- ['11'1-III-~ 4] 60. Clearance from buildings of lines of voltage and service lines not exceeding 650 Volts.- (1) An overhead line shall not cross over an existing building as far as possible and no building shall be constructed under an existing overhead line. (2) Where an overhead line of voltage not exceeding 650 V passes above or adjacent to or terminates on any building, the following minimum clearances from any accessible point, on the basis of maximum sag, shall be observed, namely:- (i) for any flat roof, open balcony, varandah roof and lean-to-roof- (a) when the line passes above the building a vertical clearance of 2.5 metres from the highest point, and (b) when the line passes adjacent to the building a horizontal clearance of 1.2 metres from the nearest point, and · (ii) for pitched roof- (a) when the line passes above the .building a vertical clearance of 2.5 metres immediately under the line, and (b) when the line passes adjacent to the building a horizontal clearance of 1.2 metres. (3) Any conductor so situated as to have a clearance less than that specified above shall be adequately insulated and shall be attached at suitable intervals to a bare earthed bearer wire having a breaking strength of not less than 3 50 kg. ( 4) The horizontal clearance shall be measured ·when the line is at a maximum deflection from the vertical due to wind pressure. (5) Vertical and horizontal clearances shall be as specified in schedule-X. Explanation:- For the purpose ofthis regulation, the expression "building" shall be deemed to include any structure, whether permanent or temporary. 61. Clearances from buildings of lines of .voltage exceeding 650 V.- (1) An overhead line shall not cross over an existing building as far as possible and no building shall be constructed under an existing overhead line. (2) Where an ove_rhead line of voltage_ exceeding 650 V passes above or adjacent to any building or part of a building it shall have on the basis of maximum sag a . . . ~ vertical clearance above the highest part of the building immediately under such line; of not less than- (i) for lines of voltages exceeding 650 Volts - 3.7 metres upto·and including 33,000 Volts (ii)for lines of voltages exceeding 33 kV - 3.7 metres plus 0.30 metre for every additional 33,000 Volts or part thereof. 230 . THE GAZETTE OF INDIA: EXTRAORDINARY [PART III-SEC. 4] (3) The horizontal clearance between the nearest conductor and any part of such building shall, on the basis of maximum deflection due to wind pressure, be not less than- (i) (ii) (iii) for lines of voltages exceeding 650 V upto and.including 11,000 Volts for lines of voltages exceeding 11,000 V - and up to and including 33,000 V 1.2 metres 2.0 metres for lines of voltages exceeding 33 kV - 2.0 metres plus 0.3 metre fore every additional 33kV or part thereof. (4) For High Voltage Direct Current (HVDC) systems, vertical clearance and · horizontal clearance, on the basis of maximum deflection due to wind pressure, · from buildings shall be maintained as below: SI.No DC Voltage (kV) Vertical Clearance Horizontal 2. 200kV 5.8 4.1 3. 300kV 7.0 5.3 4. 400kV 7.9 6.2 5 .. 500kV 9.1 7.4 6. 600kV 10.3 8.6 7. 800kV 12.4 10.7 (5) Vertical and horizontal clearances shall be as specified in schedule-X. Explanation:- For the purpose of this regulation the expresssion "building" shall be deemed to include any structure, whether permanent or temporary. 62. Conductors at different voltages on same supports.- Where conductors forming parts of systems at different voltages are erected on the same supports, the owner shall make adequate provision to guard against danger to linemen and others, from the lower voltage system being charged above its normal working voltage, by leakage from or contact with the higher voltage system and the methods of construction and the applicable minimum clearances between the conductors of the two systems shall be as specified in regulation 69 for lines crossing each other. ['ll'T III-- 4] 63. Erection or alteration of buildings, structures, flood banks and elevation of roads.- (l) Ifat any time subsequent to the erection of an overhead line, whether covered with insulating material or not, any person proposes to erect -a new ,building or structure or flood bank or to raise any road level or to carry out any other type -of work whether permanent or temporary -or to make in or upon any building, or structure or flood bank or road, any permanent or temporary addition or alteration, he and the contractor whom he employs to carry out the erection, addition c0r alteration, shall,-give intimation in writing of his intention to do so, to the supplier or owner and to the Electrical Inspector and shall furnish therewith a scale drawing sh~wing the proposed building, structure, flood bank, road or any addition .Or alteration and scaffolding thereof required during the construction, (2) On teceipt of such intimation, the supplier or owner shall examine,- (i) whether the line under reference was laid in acordance 'with the provisions of these regulations and any other Jaw; (ii) whether it is technically fMsible; (iii) whether it meets the requirement of Right of Way (ROW); (iv) whether such person was liable to pay the cost of alteration of the overhead line and if so, send a notice without undue delay, to such person together with an estimate of the cost of the expenditure likely to be incUITed to so alter the overhead line and require him to deposit, within thirty days cf the receipt of the notice, with the supplier or owner, the amount of tlw estimated cost. (3) If such person di,;putes the cost of alteration of the overhead line estimated by the supplier or owner or even the responsibility to pay such cost, the dispute may be referred to the Electrical Inspector whose decision thereof sh!!ll be final, (4) The Electrical Inspector shall estimate the cost of alteration of overhead line on the f9ilowing basis, namely:• (i) the CQSt of material used OH the alteration after crediting the depreciated· cost of the material which shall be available from the existing , line; _, 1 (ii) the wages of Jabour employed in affectin6 the alteration; (iii) supervision charges to the extent of fifteen per cent of the wages mentioned in sub clause (ii); and charges incurred by the supplier or owner in complying with the provisions of section 67 of the Act, in respect "9f such alterations, - (5) Any addition or alteration to the building or structure shall be allowed only after the deposite of such estimated cost to the supplier or owner, (6). No work upon such .building, structure, flood bank, road and addition or alteration thereto shall be commenced or continued until the Electrical Inspector has certified that the provisions of regulation 58, 60 and 61 should not be contravened either during or after the aforesaid construction: Provided. that the Electrical Inspector may, if he is satisfied that the overhead line has been so guarded as to secure the protection of persons or property from injury, certify that the work may be executed prior to the· alteration of the overhead line or in the case of temporary addition ,or alteration, without alteration of the overhead line. (7) The supplier or owner shall, oh receipt of such deposit, alter the overhead line in such a way that it does not contravene the provisions regulation 58, 60 and 61 either during or after such construction within two months from the date of such deposit or within such longer period as the Electrical Inspector may allow. 64. Transporting and storing of material near overhead lines.- (1) No rods, pipes or similar materials shall be taken beiow, or in the vicinity of, any bare overhead cop.ductors or lines if these contravene the provisions of regulations 60 and 61 unless such materials·· are transported under the direct supervision of a person · designateci in this behalf by the owner of such overhead conductors or lines. (2) No rods, pipes or other similar materials shall be brought withln the flash over distance of bare live conductors or lines. · (3) No material or earth work o.rJigricultural produce shall be dumped or stored, no trees grown below or in the· vicinity of, bare overhead conductors, or lines to contravene the provision of regulations 60 and 61. ( 4) No flammable material shall be stored under the electric supply line. (5) No fire shall be allowed above underground cables. (6) Firing of any material below electric lines shall be prohibited. 65. General clearances.- (I) For the purpose of. computing the vertical clearance of an overhead line,. the maximum sag of any conductor shall be calculated on the basis of the maximum sag in still air and the maximum· temperature as specified under regulations· 57 and computing any horizontal clearance of an overhead line the maximum deflection of any conductor shall be calculated on the basis of the wind pressure specified under regulations 57. (2) No blasting for any purpose shall be done within 300 metres from the boundary of a sub-station or .from the electric supply lines of voltage exceeding 650 V or tower structure thereof without the written permission of the owner of such sub-station or electric supply lines or tower structures and in case of mining lease hold area, without the written permission of the tnspector of Mines. (3) No cutting of soil within ten meters _from the tower structure of 132 kV and above voltage lev~shall be permitted without the written permission of the owner of tower structure. ( 4) No person shall construct brick kiln or other polluting units near the installations or transmission lines of 220 kV and above within a distance of 500 metres. -6.6, Routes proximity to aerodromes.- Overhead lines shall not be erected in the vicinity of aerodromes unless the Airport Authorities have approved in vniting the -- route of the proposed lines as-per relevant Indian Standards. · 67. Maximum interval between supports.- All conductors shall be .attached to. supports at intervals not exceeding the safe limits based on the ultimate_ tensile · strength of the conductor and the factor of safety specified under regulations 57. = Provided that in the case of overhead lines carrying conductors of voltage • not exceeding 650 V when erected in, over, along or across any street, the interval _ shall not, without the consent in· writing of the Electrical Inspector, exceed 65 metres. - · --- ---68; Conditions to apply· where te_!ecommunication lines and power lines are_ carried on same supports.- (1) Every overhead telecommunication line erected on supports carrying a power line shall consist of conductors each having a b1caking strength of not less than 270 kg. - - (2) Every telephone used on a telecommunication line e_rected on supports _ carrying a power line shall be suitably guarded against lightning and shall be protected by cut-outs. - - - (3) Where a telecommunication lirie is erected on supports carrying a power line of voltage exceeding 650 V, arrangement shall be made to safeguard ·any person against injury resulting from contact, leakage or induction· between such po;,.,er and telecommunication lines. - 69. Lines crossing or approaching each other and lines crossing- street and ·road.­ Where an overhead line crosses or is in proximity to any telecommunication line.­ the owner of either the overhead lirie or the telecommunication line, whoever_ lays his line later, shall arrange to provide for protective devices or _guarding _ · - arrangement and shall observe the following provisions, ·namely:- 3747 Gl/10-30 (i) when it is intended to erect a telecommunication line or an overhead line which will cross· or be in proximity to an overhead line or a· telecommunication line, as the case may be, the person proposing to erect such line shall give one month's notice ofhis· int<:ntion so to do alorig with · the relevant details of protection and drawings to the owner of the existing iine; '(ii) guarding shall be provided where lines of voltage not exceeding 33 kV cross a road or street; (iii) where an overhead line crosses or is in proximity to another overhead line, guarding arrangements shaH be provided so to guard against the _ possibility of their coming into contact with each other; (iv) where an overhead line crosses another overhead line, clearances shall be as under:- (Minimum clearances in metres between lines crossing each other) No System kV I. - Low and 2.44 3.05 4.58 5.49 7.94 Medium 2. 11-66 ky' 2.44 3.05 4.58 5.49 7.94 3. 110-132kV 3.05 3.05 4.58 5.49 7.94 4. 220kV 4.58 4.58 4.58 5.49 7.94 5. 400kV 5.49 5.49 5.49 5.49 7.94 6: 800kV 7.94 7.94 7.94 7.94 7.94 Provided that no guardings are required when line of voltage _ exceeding 33 kV crosses over another line of250 V and above voltage or a road or a. tram subject to the condition that adequate clearances are provided between the lowest conductor of the line of voltage exceeding 23 kV and the top most conductor of the overhead line crossing underneath the line of voltage exceeding 33 kV and the clearances as stipulated in regulation 58 from the topmost surface of the road maintained; (v) where an overhead .direct current (DC) line crosses another overhead line, clearances shall be as under:- (Minimum clearances in metres between AC and DC lines crossingfach other) I. Low and 3.Q5 4.71 Medium AC 2. I 1-66 kV 3.05 4.71 5.32 6.04 6.79 7.54 AC 3. 110-132 kV 3.05 · 4.71 5.32 6.04 6.79 7.54 AC I i) (vi) a person erecting or proposing to erect a line which may cross or be in proximity with an existing line, shall provide arrange:ments on his own line or require the owner of the other overhead line to provide guarding arrangements as referred to in clause (iii) and (iv); (vii) in all cases referred to in this regulation the expenses of providing the guarding arrangements or protective devices shall b~ borne by the person whose line was last erected; (viii) where two lines cross, the crossing shall be made as nearly .at right angles as the nature of the· case admits and as near the support of the line as practicable, and the support of the lower line shall not be erected .below the upper line; (ix) the guarding arrangements· shall ordinarily be carried .out by the owner of the supports on which it is made and he shall be responsible for its efficient maintenace . 70. Guarding.- ( 1) Where guarding is required under these regulations the following shall be observed , namely: 0 • (i) every guard-wire shall be connected with earth at each point at which its electrical contimiity is broken; (ii) · every guard-wire shall have an actual breaking strength of not less · than 635 kg and if made of iron or steel, shall be galvanised; (iii) every guard-Wire or cross-connected systems of guard-wires shall have sufficient current-carrying capacity to ensure them rendering dead, without risk of fusing of the guard-wirn or wires, till tt,e contact of any live wire has b.een removed. \ I ·.· 236 THE GAZETTE OF INDIA : EXTRAORIDINARY [PART III-SEC. 4] (2) In the case of a line crossing over a trol~ire the guarding shall be .. subjected to the following conditions, namely:-. (i) where there is only one trolley-wire, two guard~ires shall be erected as in DJAGRAM-A; . . (ii) where there are two trolley ~wires and the distance between them does not exceed 40 ems, two guard-wires shall be erected as in . DIAGRAM-B; (iii) where there are two . trolley wires and the distance between them exceeds 40 ems but does not exceed 1.2 metres, three guard-wires shall be erected as in DJAGRAM-C; (iv) where there are two trolley-wires and the distance between them exceeds 1.2 metres, e.ich trolley-wire shall be separately guarded as in DIAGRAM-D; (v) the rise of trolley boom shall be. so limited that when the trolley leaves the trolley-wire, it shall not foul the guard-wires; and (vi) where a telegraph-line is liable to'fall or be blown down upon an arm, stay-wire or·span-wire and so slide-down upon a trolley-wire, guard hooks shall be provided to prevent such sliding. DIAGRAM-A .c:1 r··················~ MIN 60Cms I DIAGRAM-B DIAGRAM-C MIN MIN MIN MIN Cms 40Cms 40 Cms and ilpto I 20cms i 60Is •O 0111 60Is •O OVER 120cms. 71. Service lines from overhead lines.- No service-line of tapping shall be taken off an overhead line except at a point of support: Provided that the number oftappings per conductor shall not be more than four in case of connections at voltage not exceeding 650 V. 72. Earthing.- (I) All m!ltal supports and all reinforced and prestressed cement concrete supports of o~erhead lines and metallic fittings attached thereto, shall be either. permanently and efficiently. earthed by providing a continuous earth wire and securely fastening to each pole and connecting with earth ordinarily at three points in every km. with the spacing between the points being as neatly equidistant as possible or each support and the metallic fitting attached thereto shall be efficiently earthed. (2) Metallic. bearer wire used for supporting •insulated wire of overhead service lines of voltage notexceeding 650 V shall be efficiently earthed or insulated. (3) Each stay-wire shall be similarly earthed unless insulator has been placed· in it at a height not less than 3.0 metres from the grourid. 73. Safety and protective devices.- (I) Every overhead line which is not being suspended from a dead bearer wire, not being covered with insulating material and not being a trolley-wire, · is erected over any part of a street or other public place 238 · THE GAZETTE OF INDIA : EXTRAORDINARY [PART Ill-SEC. 4] or in any factory or mine or on any consumer's premises shall be protected with earth gaurding for rendering the line electrically harmless in case it breaks. (2) An Electrical Inspector ma'y, by notice in writing, require the owner of any such overhead· line, wherever it may be erected, to protect it in the manner specified in sub-regulation(]). (3) The owner of every overhead line of voltage exceeding 650 V shall make adequate arrangements as per relevant Indian Standards to prevent undesignated persons from ascending any of the supports of such overhead lines which can be easily climbed upon without the help of a ladder or special appliances: Explanation.- For the purpose of this relgulation, rails, reinforced cement concrete poles and pre-stressed cement concrete poles without steps, tubular poles, wooden supports without steps, I-sections and channels' shall be deemed as supports which cannot be easily climbed upon. 74. Protection against lightning.- ( 1) The owner of every overhead line, sub-station or generating station which is exposed to lightning shall adopt efficient means for diverting to earth any electrical surges due to lightning y.,hich may result into (2) The earthing lead for any lightning arrestor shall not pass through any iron or steel pipe, but shall be taken as directly as possible from the lightning arrestor ·without touching any metal part to a separate-vertical ground electrode or junction of the earth mat already provided for the sub-station of voltage exceeding 650 V subject to the avoidance of bends wherever practicable. · · 75. Unused overhead lines.- Where an overhead line ceases to be used as an electric supply line: ( i) the owner shall maintain it in a safe mechanical condition m accordance with regulation 57 or remove it (ii) the Electrical Inspector shall, by a notice in writing served on the owner, require him to maintain it in a safe mechanical condition or to remove it within thirty days of the receipt of the notice. 76. Laying of cables.- (I) No underground power cable of voltage exceeding 33 kV shall be. laid without a minimum underground depth of 1.2 meters. (2) No underground telecommunication cable shall be laid without a minimum separation distance of 0.6 meters to the underground power cable of voltage exceeding 33 kV. 77. Protection against electromagnetic interference.- The owner of every overhead power line ofyoltage level 11 kV or higher shall submit proposal for obtaining Power Telecommunication Co-ordination Committee clearance to ensure safety of the personnel and telecom equipment. Chapter VIII Safety requirements for-Electric Traction 78. Application of chapter.- (1) The regulations in this chapter shall apply only where electricity is used for the purposes of traction: )'rovided that nothing in this chapter shall apply to electricity used for the public carriage of passe_ngers, animals or goods on, or for- the lighting or ventilation of the rolling stock of any railway or tramway subject to the provisions of the Railways Act, 1989 (24 of 1989). · · (2) In this chapter the conductor used for transmitting electricity to a vehicle is referred to as the "line" and the other conductor as the "retuf[l". (3) The owner of the line, return, rails or trolley wire, as the case may be, shall be responsible for the observance ofregulations 79 to 92. (4) Before an application is made by the owner of an installation of voltage exceeding 650 V to the Electrical Inspector for permission to commence or recommence supply after such installation has been disconnected for six months and above, the supplier shall ensure that the_electric supply lines or apparatus at voltage exceeding 650 V belonging to him are placed in position, properly connected and duly completed. (5) The supply of electricity shall not be Dommenced by the supplier unless and until the Electrical Inspector is satisfied that the provisions of regulations 44 to 50 and regulation 79 to 92 havl been cotnpli1'd with and the approval in writing of the Electrical Inspector has been obtained by him. 79. Voltage of supply to vehicle.- No person shaBsupply electricity to any troiley wire or other conductor at voltage exceeding 650 V used in direct electrical and mechanical connection with any vehicle, except with the writien approval of the Central Government or the -State Government, as the case may be, and subject to · such conditions as the State Government may think reasonable to impose. 80. Insulation of Jines.- Every line shall be ;'1sulated throughout and a line may consist of either bare conductors supported c,~ structures through insulators or insulated cable. 81. Insulation of returns.- (I) Where any rails on which cars run, or any conductors laid between or within 0.9 metre of such rails, form any part of a return, such part may be un-insulateu and all other returns or parts of a return, shall be insulated, unless they are of such conductivity as to secure the conditions required b)' sub-regulations (2) and (3 ) ofregulation 82. (2) Where any part of a return is un-insulated, it shall be connected with the negative or neutral of the system. 82. Prol!imi~ t-O"-nteta'ltic-pi~s.- (I) Whei't-lMfWn-iniiul'ated return is in proximity to any metallic pipe, structure or substanc_~ not belonging to the owner of the return, the owner of un-insulated return· shall, if so required by the owner of sucH pipe, structure or substance, connect his return therewith at his own exJl!'ll§_e, (2) _Where the return is partly or entirely un-insulated, the owner shall, in the construction and maintenance of his system, adopt ,such means for reducing the . difference produced by the current between the potential of the un-insulated. return at any one point and the potential of the un-insulated return at any other point as to ensure that the difference of potential between the un-insulated return and any metallic pipe, structure or substance in the vicinity shall ndt exceed four volts where the return is relatively positive, or one and one-third volts where the return is relatively negative. (3) The owner of any such pipe, structure- or substance in respect of it require the owner of the un-insulated return at reasonable times and interyals to ascertain by test in his presence or in the presence of his representative, whether the condition specified in sub-regulation (2) is fulfilled, and, if such condition is. found to be fulfilled, all reasonable expenses of, and incidental to, carrying out of the test shaB be borne by the owner of the pipe, structure or substance. (4) The potential ofun-insulated return w1threspect to earth at any point shall not exceed fifty volt under normal conditions. (5) The petroleum sidings installation earth shall be. connected to the uncinsulated return to make· it equi-potential and pipelines in the vicinity of the track should be properly earthed. · 83. Difference of potential on return.- Where the return is partly or entirely un­ insulated, the owner shall keep a continuous record of the difference of potential, during the w()rking of his sy~tem, between every junction of an insulated return with an mi-insulated return and the point on the route most distant from that att ;- . . . . . •- ' - junction, and the difference .. ,oC potential shall not, under normal runnihg conditions; exceed a mean value of seven vo~ts between the highest momentary peak and the average for the ho11r of ma){imum load. - 84. Leakage on conduit system.- Where· both the line and the return are placed within a conduit, the following conditions shall be fulfilled in the construction and maintenance of the system, namely:- ( i) where the rails are used to form any part of the return, they shall be electrically connected at distances not exceeding 30 me~s apart;-wit!l the conduit by means. of copper, strips having a ci:ol!s-sectional area of atleast 0.40 sq. cm. or by other means of equal,conductivity and. where the return· is wholly insulated and contained· within the conduit, the latter shall be connected with darth at the gdner~ting station or ~lib-station through an . instrument suitable for the indication of.any contact.oqiartiaLcontact of either the iine or the return with .the conduit; and · (ii) the leakag~-c~rrent sliaill ,be as~ertained daily, before or after the hours. of running, when· the line is fully charged and if at any time it is founq to. exceed 0,6-;:4Jllp~c,l,per, lqn,;;iif,,1ingle,- tramw.ay.!ltrack-j the . . J ['IT'T III-~ 4] transmission and use of electricity shall be suspended unless the leakage is stopped within twenty four hours. 85. Leakage on system other than conduit system.- Where both the line and the return are not placed within a conduit, the leakage current shall be ascertained daily before or after the hours of running, when the line is fully charged and if at _any time it is found to· exceed 0.3 ampere per km. of single tramway track, the transmission and use of electricity shall be suspended unless the leakage is stopped within twenty four hours. 86. Pas~engers not to have access to electric circuit.- Precautions to-the satisfaction of an Electrical Inspector shall be taken by the owner of every vehicle to prevent,- - (i) the access of passengers to any portion of the electric circuit where there is danger from elec_tric shock; (ii) any metal, hand-rail or other metallic substance liable to be handled by passengers, becoming charged. · 87. Isolation of sections.- Every trolley wire shall be constructed in sections not -exceeding l.6 km. in length, and means shall be provided for isolating each section. - 88. Minimum size and strength of trolley wire.- No trolley-wire shall be of less cross-sectional area than 0.5 sq. cm. of shall have an actual breaking load of less· than 2000 kg. · · 89. Height of trolley wire and length of span.- A trolley wire or a traction feeder on the same supports as a trolley wire shall, at no place be, at a height from the surface of the street of less than 5.2 metres except, where it passes under a bridge or other fixed structure, or through or along a tunnel or mineshaft or the like in which case it shall be suspended to the satisfaction of an Electrical Inspector. 90. Earthing of guard wires.- Every guard wire shall be connected with earth at each point at which its electrical continuity is broken and _shall also be connected with the rails at intervals of not more than five spans . 91. Proximity to magnetic observatories and laboratories.- Traction works shall not be carried out in the vicinity of geomagnetic_ observatories and laboratories without the concurrence of the Central Government or of any officer authorised by it in this behalf. 92. Records.-(]) The ownershall keep the following records, namely : - (i) daily records showing - 3747 Gl/10-31 (a) the maximum working current from the source of supply; (b). the maJ<imum working voltage at the source of supply; · • (c) the·difference of potential, as required under regulation 83; and ( d) the leakage current, if any, as required under regulation 84 and (ii) occasional records showing- (a) every test made under sub-regulation (2) and (3) ofregulation 82 (b) every stoppage of leakage, together with the time occupied; and ( c) particulars of any abnormal occurre11ce affecting the electrical working of the system. (2) The records so kept under sub-regulation (I) shall be open to examination by Electrical Inspector. Chapter IX Safety requirements ·for mines and oil fields 93. Application of chapter.0 The regulation in this chapter shall- apply only where electricity is used.in mines as defined in the Mines Act, 1952 (35 of 1952) 0 andoil fields. 94. P.esponsibility for observance.- (I) It shall be the duty of every person in charge of and responsible to the mine including the owner, agent, manager and Engineer of mine and oil field to comply with and enforce the regulations in this chapter and it shall be the duty of all persoiiS employed to conduct their work in accordance with these regulations. (2) _In every mine. or oil-field while_ ~lectricity _is being us_ed such number of designated supervisors and electnc1~ns shall be on .duty as the owner may decide. · Explanation -For the purposes of this regulation, the word "Engineer" shall (i) in the case of a coal mine, have the same meaning as assigned to it in the Coal Mines Regulations, 1957; (ii) in the case . of a metalliferous mine, have the same meaning as assigned to it in the Metalliferous Mines Regulations,_1961; and (iii) in the case of an oil mine, rnean the 'Installation Manager' under the Oil Mines Regulations, 1984. 95. Notices.- (1) On or before the first day of February in every year, in respect of every mine or oil-field, returns giving the size and type of apparatus, together with such particulars in regard to circumstances of its use which may be required by the Inspector, shall be sent to the inspector of mines by the persons specified in f ['WT 111-"&U& 4] regulation 94 in the form set out in Schedule-XI or Schedule-XII whichever is applicable. (2) The persons specified in regulation 94, shall also give to the inspector of mines not less than seven days notice iti writing of the intention to bring into use · any new installation in a mine or oil-field"'giving details of apparatus installed and its location: · Provided that in case of any additions or alterations to an existing installation of voltage not exceeding 650 V, immediate notice in writing sha)I be sent to the inspector of mines before such add,tions orlalterations are brought into use. Provided further that this regulation shall not apply to telecom1)1unication or· signaling apparatus. 96. Plans.- (I) A correct. plan, on the same scale as the plan kept at the mine in fulfillment of the requirements of the Mines Act, 1952 (35 of 1952), shall be available in the office at the. mine showing the position of all fixed apparatus and conductors therein, other than lights, telecommunication or signaling apparatus, or cables for the same. (2) A sim_ilar plan on the scale not less than 25 cm. to a km. (1 :4000) sha]I be kept by the manager or owner of one or more wells in any oil-field. (3) A similar plan on such scale as the Central Government may direct, showing the position of all electric supply lines, shall be kept in _the office of any licensee or other person transmitting or distributing electricity in a.mine or oil-field. ( 4)- The plans specified under this regulation shall be examined and corrected as often as necessary to keep them up-to-date and the dates of. such examinations shall be entered thereon by the manager or owner of the mine or wells and such plans shall be available to the Inspector, or inspector of mines, at any time. 97. Lighting, overhead lines, communication and fire precautions.- ( 1) In a mine illum_inated by electricity, one or more flame safety lamps, or o\her lights approved by the inspector of miires, shall be maintained in a st.ate of continuous illumination in all places where failure of the electric light at any time shall be prejudicial to safety. (2) Efficient means of comrriunication shall be provided in every mine between the point where the switchgear under sub-regulation (1) regulation 105 is.erected, the shaft bottom and other dist.ribuiing cent.res in the mines. (3) Fire extinguishing appliances of adequate capacity and. of an approved type shall be i11stalled and properly maintained in every place in a mine containing apparatus, other than cables, telecommunication and signaling apparatus. (4) In case of mines, minimum clearance above ground of the lowest conductor of over head lines or over head cables where-dumpers or trackless vehicles are being operated, shall not be less than twelve meters in height from the ground across the road where dumpers or trackless vehicles cross. 98. Isolation and fixing of transformer and switchgear.- ( l') Transformers and switchgear shall be placed in a separate room, compartment or box where · necessary to prevent danger of mechanical damage. (2) Urilessthe apparatus is so constructed,.protected and worked as to obviate the risk_ of fire, no inflammable material shall be used in the. construction-of any room, compartment or box containing apparatus, or in the construction of any of -the . fittings therein and each such room, compartment or box shall be substantially constructed and shall be kept dry and illuminated and efficient ventilation shall be provided for all apparatus installed therein. (3) ·All apparatus that has to be worked or attended to and all handles intended to be operated shall be placed at a spacious working place which is accessible, clear of obstruction and free froin danger, so far as circumstances permit. . 99. Method of earthing.- Where earthing is necessary in a mine it shall be carried out by connection to an earthing system at the surface of the mine and in a manner approved by the inspector of mines. 100.Protective equipment.- (I) In"the interest of safety, appropriate equipment shall be suitably placed in the mines for automatically disconnecting supply to any part of the system, where a fault, including an earth f!)Ult, occurs and fault current shall not be more than 750 milliampere in installations of voltage exceeding 250 V and upto 1100 V for below ground mines and oil fields and 50 ampere in installations of voltage exceeding 1100 V and upto 11 kV in open cast mines and the magnitude of the earth fault current shall be limited to these specified values by employing suitably designed, restricted neutral system of power supply. (2) The operation of the switchgear and the relays shall be recorded daily .at the g¢nerating station, sub-station or switch station•in a register kept for the purpose. (3) The effectiveness of the switchgear and the protective system shall always be kept and maintained in working order, shall be checked once every three months and the result thereof shall be recorded in a separate register kept for the purpose. {OLEarthing metal.- (I) All metallic sheaths, coverings, handles, joint boxes, - •·• '·"s'Witchgear,frames, instrurriei:it covers, switch and fuse covers of boxes, all lamp holders, uriless efficiently protected by an insulated covering made of fire resisting . material, and the frames. arid bedplates of generators, transformers and motors, including portable motors, shall be· earthed .by connection to an earthing ~ystem in the manner specified in regulation 99. (2) Where cables are provided with a metallic covering constructed and installed in accordance with clause (d) of regulation I 06, such metalli.c covering may be used as a means ofcotmection to the earthing system. . (3) All conductors, of an earthing system shall have conductivity, at all parts and all joints, at least equal to fifty per cent of that of the largest conductor used solely to supply the apparatus; a part of which desired to be earthed: [ '1111 111~= 4 l Provided that no conductor of an earthing system shall have a cross­ sectional area. less than 0.15 sq. cm. except in the case.of the earth conductofof a flexible cable used withportable apparatus where the voltage does not exceed 125 Volts, and. the cross-sectional area and c_onductance of the earthcore is not less than that of the largest o~ the live conductors in the cable.· (4) All joints in earth conductors-and all joints ,in the metallic· covering of cables shall be properly soldered or otherwise efficiently made. (5) No switch, fuse or circuit-bre~ker shall be inserted in any earth conductor. (6) This regulation shall not apply, except in the case of portable apparatus, to any system in a mine in which the voltage does not exceeid 30 V. 102. Voltage limits.- Electricity shall not be transmitted into a mine at a voltage exceeding 11000 V<i.lts and shall not be used therein at a voltage exceeding 6600 Volts: Provided thata (i) where hand-held portable apparatus is used, the voltage shall not exceed 125V; (ii) where electric lighting is used,' (a) in underground mines, the lighting system shall have a mid or neutral point connected with· earth and the voltage shall not txceed 125 V between phases; (b) on the surface of a mine or in an,open cast mine, the voltage may be raised to 250 V, if the neutral or the mid point of the system is connected with earth and the voltage between the phases does not exceed 250 V; (iii) where portable hand-lamps are used in underground working of mine, the voltage shall not exceed 30 V; (iv) where any circuit is used for the remote control or electric inter-locking of apparatus, the circuit voltage shall not exceed 30 V: Provided further that in fixed plants, the said voltage may be permitted upto 650 V, if the bolted type plug is used. 103. Transformers.- Where electricity is. transformed, suitable provision shall be made to guard ·against danger by reason of the lower voltage apparatus becoming accidentally charged above its normal voltage by leakage from or contact .with the 104.Switchgear and terminals.- Switchgear and all terminals, cable-ends, cable-joints and connections. to apparatus shall be totally enclo~ed and shall be constructed, installed and maintained as to comply with the following requirements, namely:- (i) all parts shall be of mechanical strength sufficient to resist rough usage; (ii) all conductors and contact areas shall be of adequate current-carrying capacity and all joints in conductors shall be properly soldered or otherwise . efficiently made; . . (iii) the lodgement of any matter likely to diminish the insulation or affect the working of any switchgear shall He prevented; · (iv) all live parts shall be· so protected or enclose.d.as to prevent persons accidentally coming into coniact with them and to prevent danger from arcs, short-circuits, fire, water, gas or oil; (v) where there may_ be risk of igniting gas, coal-dust, oil or other inflammable material, all parts shall be, so protected as to prevent open sparking; and (vi) every switch or circuit-breaker shall be so constructed as to be capable of opening the circuit it controls and dealing with any short-circuit without danger. · 105.Disconnection of supply.- (1) Properly constructed switchgear for disconnecting the supply of electricity to a mine or oil-field shall be provided ata point approved by the inspector of mines. (2) At any time, when any cable or overhead line supplying electricity to the mine from the aforesaid switchgear is live, a person designated to ·operate the said switchgears shall· be available within easy reach thereof: Provided that in the case of gassy coal seam of second degree and third degree gassiness, the main mechanical ventilator operated by electricity shall be interlocked with the switchgear so as to automatically disconnect the power supply in the event of stoppage of main mechanical ventilator. (3) When necessary in the interest of safoty, any apparatus suitably placed, shall be provided for disconnecting the supply from every part of a system. · ( 4) If the inspector of mines in the interest of safety considered· it necessary, he may direct that the apparatus specified in sub-regulation (3} shall be so arranged as • to disconnect automatically, from the supply, any section of the system subjected to a fault. (5) Every motor shall be controlled by switchgear which .shall.be soatranged as to disconnect the supply from the motor and .from all iipparatus connected thereto and such switchgr;ar shall beso placed as to be easily operated by the person designated :to.operate the motor. ( 6) Whenever required by the inspector of mines the motor shall be controlled by a switchgear to disconnect automatically the supply in the event of conditions of over-current, over-voltage and single phasing. (7) Auxiliary fan shall be interlocked with the switchgear controlling power supply to the in-bye face equipment of below ground coal mine for automatic disconnection ·Of power supply in the event of the stoppage of the auxiliary fan. 106.Cables.- All cables, other than flexible cables for portable or transportable apparatus, shall fulfill the following reguirements, namely:- (i) all such cables, other than the outer conducior of a concentric cable, dhall be covered with insulating material and shall be efficiently protected from mechanical damage and supported at sufficiently frequent intervals and in such a manner as to prevent damage to such cables; · (ii) (a) except as provided in clause (iii) no cables. other than concentric cables or single core or two core or multi core cables protected by a metallic . coveting and which contain all the conductors of a circuit shall be used where the voltage exceeds 125 V or when an Inspector considers that there is risk M igniting gas or coal dust or other inflammable material, and so directs; (b) th.e sheath of metal-sheathed cables and the metallic armouring of armoured cables shall be of a thickness not less than that recommended from time to time in -the relevant standard of the Bureau of Indian Standards; (iii) where a voltage exceeding 250 V but not exceeding 650 V direct current system is used, two single core cables may be used for any circuit provided that their metallic wverings are bonded together by earth conductors so placed that the distance berHeen any two consecutive bonds is not greater than thirty metres measured along either cable; (iv) The metallic covering of every cable shall be - {a) electrically and mechanically continuous throughout; (b) earthed, if it is required by sub-regulation (3) of regulation, l O l to be earthed by a c.:mnection· to the earthing system of conductivity specified therein; · (d) of a conductivity at all parts and at all joints at least equal to fifty per cent of the conductivity of the largest conductor enclosed by the said metallic covering; and (e) where there may be risk of igniting gas, coal-dust, or other inflammable · material, so constructed as to prevent, as far as practicable, the occurrence of · open sparking as the result of any fault or leakage from live conductors. (v) cables and conductors where connected to motors, transfonn~rs, switchgear and other apparatus, shall bejnstalled· so·that,-. · · - ',-·s , -,~»,.-,•·""' - . - 248 TIIE GAZETTE OF INDIA : EXTRAORDINARY [PART III-SEC. 4) (a) they are mechanically protected by securely attaching the metallic covering to the apparatus; and· (b) the insulating material at. each cable end is efficiently sealed so as to prevent the diminution of its irisulating properties; (vi) where necessary to prevent abrasion or to secure gas-tightness, properly constructed glands or bushes shall be provided; (vii) unarmored cables or conductors shall be conveyed either in metallic pipes or metal casings or suspended from efficient insulators by means of non­ conducting materials which will not cut the covering and which will prevent contact with any timbering or metal work and if separate insulated conductors are used, they shall be installed at least 3. 7 5 cm, apart and shall not be brought together except at lamps, switches and fittings. 107.Flexible cables.- (1) Flexible cables for portable or transportable apparatus shall be two core or multi core, unless required for electric welding, and shall be coverc,:l with insulating material which shall be. efficiently protected from mechanical injury. (2) If flexible metallic covering is used either as the outer conductor of a concentric cable or as a means of protection from mechanical injury, it shall not be used by itself to form an earth conductor for such apparatus, but it may be used for that purpose in conjunction with an earthing core. (3) Every flexible cable intended for use with portable or transportable apparatus shall be connected to· the system and to such apparatus by properly constructed · connectors: Provided that for machines ofvoltage exceeding·650 V but Ijot exceeding 33 kV a bolted type connector shall be used and the trailing cable sh~ll be suitably anchored at the machine end, ·· Provided .further thaLwhere there. are space limitations /} multiple on­ board motors and equipment for transportable or portable machines; direct entry flexible cable with elastomeric sealing rings, compression gland, pa¢king gland or sealing box which does not alter the flame proof property may be p{rmitted and if a cable entry can accept any sealing ring with same outside dian)~t6t but different internal dimension, the ring shall have a minimum uncompressti~csa'xial height of twenty. millimeter for circular cables of diamet~r not . grea.tef . than twenty millimeter and twenty five millimeter fqr circular cables of diamaer greater than twenty millimeter. (4) At every point where flexible cables are joined ·to mainjiables, a circuit breaker shall be provided which is capable of automatically ~\isconnecting the supply from such· flexible cables: ;,.', (5) Every flexible cable attached to a porta.bje or transportab_l;l:achine shall be examined periodically by the person designated to operaterthe machine, and if such cable is used underground, it shall be examined-at- least once in each s.hift by . such person and if such cable is found to be damaged or defective, it shall forthwith be replaced by a cable in good condition. (6) If the voltage of the circuit exceeds 250 V, all flexible cables attached to any transportable apparatus shall be provided with flexible metallic screening or pliable armouring and cables of portable apparatus shall be provided with flexible metallic screening on all the power and pilot cores. Provided that the provision of this regulation shall not apply to flexible cables attached to any transportable or portable apparatus used in open cast mines or below ground mines where reeling and _unreeling of such cables is necessary as per design features of the equipment. (7) All flexible metallic screening or armouring specified in sub-regulation (6) shall fulfill the requirement specified in clause (iv) ofregulation 106 . Provided that in the case of separately screened flexible cables the conductance of each such screen shall not be less than twenty five per cent of that of the power conductor and the combined conductance of all such screens shall in no case be less than that of 0.15 sq. cm. copper conductor. (8) Flexible cable exceeding hundred metres in length shall not be used with any _ portable or transportable apparatus: Provided that such flexible cable when used with coal cutting machines or cutter or loader or armoured face conveyor for long wall operation, or with shuttle cars or load haul dumper or cutter loader or all alike equipment for development and de-pillaring operation shall not exceed two hundred fifty metres.in length: - Provided further that 'the aforesaid cable in casec of an open cast mine when used with electrically operated heavy earth moving machinery shall not exceed _ three hundred metres in length and for bucked wheel excavator at 11 kV shall not exceed one thousand metres in length. (9) Flexible cable, when installed in a mine, shali be efficiently supported and protected from mechanical injury . (l0)Flexible cables shall not be used with apparatus other than portable or transportable apparatus .. (11) Where flexible cables are used they shall be detached or otherwise isolated from the source of supply when not in use, and arrangements shall be made to prevent the energising of such cables by undesignated persons. 108.Portable and transportable machines.- The person_ designated to operate an electrically' driven coal-cutter, or other portable or transportable machine, shall not leave the machine while it is in operation and shall, before leaving the area in which such machine is operating, ensure that the supply is disconnected from the flexible cable which supplies electricity to the machine and when any such machine is in operation, steps shall be taken to ensure that the flexible cable is not dragged along by the machine: 3747 Gl/10-32 Provided that all portable and transportable machines used in underground mines shall operate on remote control from the concerned switchgear with pilot core protection. 109.Sundry precautions.- ( 1) AH apparatus shall be maintained reasonably free from dust, dirt and moisture, and shall be kept clear of obstruction. (2) All apparatus· other than portable and transportable apparatus shall be housed in a room, compartment or box so constructed as to protect the contents from damage occasioned by falling material or passing traffic. (3) faflammable or explosive material shall not be stored in any room, compartment or box containing apparatus, odn the vicinity of any apparatus. (4) In case of a fault in any circuit, the part affected shall be made dead without delay and shall remain so until the fault has been remedied.· (5} While lamps are being changed the supply shall be disconnected. (6) No lampholder shall have metallic. connection with the guard or other metal work of a portable hand lamp. · (7) The following notices in Hindi and local language of the district, so designed arulprotected as to be easily legible at all times, shall be exhibited at the following places, namely:- (i) where electrical apparatus is in use, a notice forbidding undesignated persons to operate or otherwise interfere with such apparatus; (ii) in the interior or at the surface of the mine where a telephone or other means of communication is provided, a notice giving full instructions to person, at the surface of the mine, designated to effect the disconnection of the supply of electricity to the mine. · (8) All apparatus, including portable_ and transportable apparatus, shall be operated only by those persons who are designated for the purpose. (9) · 'Nhere a plug-and-socket-coupling other than of bolted type is used with flexible cables, an electri,al inter-lock or other approved device shall be provided to prevent the opening of the couplfug while the conductors are live. HO.Precautions where gas exists. - (1) In any part of a coal-seam of the first degree gassiness- (i) all cables shall be constructed, installed, protected, operated and maintained in such a manner as to preventrisk of open sparking; (ii) all signaling, telecommunication, remote control and insulation tester circuits shall be so constructed, installed, protected, operated _and maintained aHo be intrinsically safe; r ['IT'T in-~ 4] (iii) all apparatus including portable and transportable apparatus including lighting fittings used at any place which lies in-bye of the last ventilation connection shall be flame-proof: Provided that electrically . operated or battery operated portable or transportable apparatus such as shuttle car, men or material transporting equipment of increased safety type"'e" shall be permitted at any place with suitable monitoring devices for detection of gases, if any; (iv) all electric lamps at any place which lie in-bye of the .last ventilation connection and return airways shall be in flame proof enclosure and at other places these shall be in increased safety enclosure type 'e'. (2) At any place which lies-in any part of a coal-seam of second and third degree gassiness- (i) all signaling, telecommunication, remote control and .insulation tester circuits shall be so constructed, installed, protected, operated and maintained as to be intrinsically safe; · (ii) all cables _shall be constructed, installed, protected, operated aml maintained in such a manner as to prevent risk of open sparking; (iii) all apparatus, including portable and transportable apparatus .used at any place within ninety. metres of any working face or goaf in case of a second degree gassy mine and within two hundred seventy metres of any working face or goaf in case· bf third degree gassy mine or at any place which lies in­ bye of the last ventilation connection or in any return airways shall be flatne• proof; (iv) all electric lamps shall be enclosed in flame-proof enclosures. (3) Ia.any oil mine or oil-field, at any place within the zone-2 hazardous areas- (i) all signaling and telecommunication, remote control and insulation tester circuits shall'be so constructed, installed, operated, protected and maintained as to be intrinsically safe; ( ii) all cables shall be so constructed, installed, operated and maintained as to prevent risk of open sparking; (iii) all apparatus including portable and transportable apparatus shall have the folluwina 'iypes of enclosures conforming to the relevant Indian Standards, namely:-. (a) flame'proof enclosure type 'd' or (b) . pressurized enclosure type 'p' or ( c) sand filled apparatus type 'q' or (d) increased safety enclosure type 'e', 'n' and 'o' (iv) all electric lamps shall be enclosed in increased safety enclosure type 'e'. (4) In any oil mine or oil-field, at any place within the zone-I hazardous areas­ (i) all signaling and telecommunication, remote control and insulation tester circuits shall be so constructed, installed, operated, protected and maintained as to be intrinsically safe; (ii) all cables shall be so constructed, installed, operated and maintained as to prevent risk of open sparking; (iii) all apparatus including portable arid transvortable apparatus shall have the following types of enclosures conforming to the relevant Indian Standards, namely:- (a) flame-proof enclosure type 'd' or (b) pressurized enclosure type 'p' or (iv) all electric lamps shall be enclosed in flame-proof enclosures. (5) In any oil mine at any place within zone-0 hazardous area no electrical equipment shall be used and where it is not practicable, intrinsically safo "pparatus are only to be used with the prior approval of the Inspector. , . (6) In any coal-seam of degree second and degree third gassiness or the hazardous area of oil-mine the supply shall be discontinued; (i) immediately, if open sparking occurs; (ii) during the period required for examination or adjustment of the apparatus, which shall necessitate the exposing of any part liable to upen sparking; (iii) the supply shall not be reconnected until the apparatus has been examined by the electrical supervisor or one of his duly appointed assistants and until the defect,_ if any, has been remedied or the necessary adjustment . . made; and (iv) a flame safety lamp shall be provided and maintained in a state of· continuous illumination near an apparatus, including portable or transportable apparatus, which remains energised and where the appearance of the flame of such safety lamps indicates the presence of inflammable gas,' the supply to all apparatus in the vicinity shall be immediately disconnected and the incident reported forthwith to an official of the mine and such apparatus shall be interlocked with the controlling· switch in such a manner as to disconnect power supply automatically in the event" of percentage of inflammable gas exceeding one and one quarter in that · particular _district: Provided that whe,e apparatus for automatic detection of the percentage of inflammable gas or vapor are employed in addition to the flame safety lamps, such apparatus shall be approved by the inspector of mines and maintained in perfect order. (7) In any part of a coal-seam of any degree of gassiness or in any hazardous area of an oil-mine, if the presence of inflammable gas in the general body of air is found at any time to exceed one and one quarter per cent, the supply of energy shall be immediately disconnected from all cables· and apparatus in the area and the supply shall not be reconnected so long as the percentage of inflammable gas remains in excess of one and one quarter per cent. (8) In an oil mine where concentration of inflammable gas exceeds twenty percent of its lowest explosive· limit, the supply of electricity shall be cut-off immediately from all cables and apparatus lying within thirty metres of the installation and all sources of ignition shall also be removed from the said area and normal work shaH not be resumed unless the area is made gas-free: Provided that such disconnection shall not apply to intrinsically safe environmental monitoring scientific instruments. (9) Any such disconnection or reconnection of the supply shall be noted in the log sheet which shall be maintained in the form set out in Schedule-XIII and shall be reported to the inspector of mines. (lO)The provisions of this regulation shall apply to any metalliferrous mine which may be notified by the inspector of mines if inflammable gas occurs or if the · inspector of mines is of the opinion that inflammaple gas is likely to occµr in such mine. Explcmotion - !;;or the pµrprn;e of this regulation; (1) the expression 'coal-seam of fir:;! degree gassiness', 'coalaseam of second degree gassiness', 'coal-seam of third degree gassiness' and 'flameaproof . apparatus' shall have the meanings respectively assigned to them in the Coal Mines Regulations,1957. (2) The following areas in an oil-mine or oil-field shall be known as hazardous areas, namely:, (i) an area of not less than ninety metres around an oil-well where a blow-out has occurred or is likely to occur, as may be designated by the Engineer-incharge or the seniormost official present at the site; (ii) an area within ninety metres of an oil-well which is being tested by open flow; (jii) an area within fifteen metres of: (a) a producillg well-he~d or any point of open discharge of the crude them from pr other point where ernissiqp p.f hazardous . allt)qsphere is normally likely to arise; or (b) any wildcat 9r e~ploration well-head 1:ieing drilled in an area when: abpormal pressure cpnditions are known tp exist; or s==-=--c-c-.~--- ,._. _________ ---------·--- -~------· - - -- ------------ 254 TIIE GAZETI'E OF INDIA : EXTRAORDINARY [PART Ill-SEC. 4] ( c) any exploration or interspaced well-head being drilled in the area where abnonnal pressure conditions are known to exist; (iv) any area within four and one half meters of: (a) any producing well-head where a closed system of production is employed such as to prevent the emission or accumulation in the area in nonnal circumstances of a hazardous atmosphere; or. (b) expforation or interspaced well-head being drilled in an area where the pressure conditions are rionnal and where the system of drilling employed includes adequate measures for the prevention in nonnal circumstances of emission or acc.umulation within the area of a hazardous atmosphere; or (c) an oil-well whichis being tested other than by open flow. (3) "hazardous atmosphere" means an atmosphere containing any inflammable gases or vapours in a concentration capable of ignition. ( 4) "Zone 0 hazardous area" ~eans "an area in· which hazardous atmosphere is continuously present." ( 5) "Zone I hazardous area" means "an area in which hazardous atmosphere is likely to occur under nonnal operating conditions" .. ( 6) "Zone 2 hazardous area" means "an area in which hazardous atmosphere is . . likely to occur under abnonnal operating conditions". Ill.Shot-firing. - (I) When shot-firing is in progress adequate precautions shall be taken to protect apparatus and conductors, other than thoiie used for shot-firing, from injury. (2) Current from lighting or power circuits shall not be used for firing shots. (3) The provisions of regulation ! 07 shall apply in regard to the covering and protection of shot-firing cables, and adequate precautions shall be taken to prevent such cable touching other cables and apparatus. 112.Signaling. - Where electrical signaling is used,- (i) adequate precautions shall be taken to prevent signal and telephone wires coming into contact with other cables and apparatus; (ii) the voltage used in any one circuit shall not exceed 30 V; (iii) contact-make~s shall be so constructed as to prevent the accidental closing of the circuit; and (iv) bare conductors, where used shall be installed in suitable insulators. 113.Haulage: - Haulage by electric locomotives on the overhead trolley-wire system, at voltage not exceeding 650 V and haulage by storage battery locomotives may be used with the prior consent in writing of the Electrical Inspector, and subject to such conditions as he may impose in the interests of safety. 114:Earthing of neutral points. - Where the voltage of an alternating current system exceeds 30 Volts, the neutral or mid-point shall be earthed by connection to an earthing system in the manner specified in regulation 99. Provided that when the system concerned is required for blasting_ and signaling purposes, the provisions of this regulation shall not apply. Provided further that in case of unearthed neutral system adequate protection shall be provided with the approval of the Inspector 115.Supervision. - ( 1 )(i) One or more electrical supervisors as directed by the Inspector shall be appointed in writing by the owner, agent or manager of a mine or by the agent or the owner, of one or more wells in an oil field to supervise the installation. (ii) The electrical supervisor so appointed shall be the person holding a valid Electrical Supervisor's Certificate of Competency, covering mining installation issued under sub-regulation (1) of regulation 29 . . (iii) One or more electricians as directed by the Inspector'shall be appointed in writing by the owner, agent or manager of a mine or by the agent or the owner, of one or more wells in an oil field for compliance with the duties speci.fied in this regulation. (iv) The Electrician shall be a person holding license under sub-regulation (1) of regulation 29. (v) For small open cast mines and below ground mines receiving supply at voltage not more than 650 V and not having portable or transportable apparatus, electrical supervisor and electrician shall be appointed for more than one mine by the Inspector. · (2) Every person appointed to operate, supervise, examine or adjust any apparatus shall be competent to undertake the work which he is required to carry out as directed by the Engineer. (3) The electrical supervisor shall be responsible for the proper performance of the following duties, by himself or by an electrician appointed under sub­ regulation (I). (i) thorough examination of all apparatus, including the testing of earth conductors and metallic coverings for continuity, as often as may be necessary to prevent danger; (ii) -examination and testing or' all new apparatus, and of all apparatus, re­ erected in lhe mine before it is put into service in a new position. ( 4) In the absence of any electrical supervisor, the owner, agent or manager of the mine and oil field shall appoint in writing a substitute electrical supervisor. (5) (i) The electrical supervisor or the substitute electrical supervisor appointed under sub-regulation ( 4) to replace him shall be personally responsible for the maintenance at the mine or oil-field, of a log-book made up of the daily log sheets prepared in the form setout in Schedule0 XIII. (ii) The results of all tests carried out in accordance with the provisions of sub­ regulation (3) shall be recorded in. the log-sheets prepared in the form set out in Schedule- XIII. . Miscellaneous 116.Deviations.- (1} The Central Government or the State Government, as the case may. be, by order in writing, allow deviations in respect of matters referred in these regulations except regulation 30. (2)The Electrical Inspector or the inspector of mines may, by. order in writing, · allow deviations in respect of matters referred in regulations 12 to 17, 28, 35(2)(3) and (5), 36(3), 37(i) to (iv), 41(xii), 43, 44(2), 46, 52 to 54, 57 to 61, 65, 72, 74, 78 to 91, 102, 107(6), (8) and (10) and 114 Explanation- Every order allowing the deviations by the Electrical Inspector or the Inspector of Mines under sub-regulation (2) shall be placed before the Central or State Government which may disaUow or revise such deviations. AMARJEET SINGH, Secy. · Safety measures for operation and maintenance of electrical plants [See sub-regulation (3) of regulation (6)] Part I (1) Duration and content of training shall be as specified below:- (a) Thermal Power Stations.- (i) The minimum duration of the trammg courses for the operating engineers and supervisors (mechanical, electrical and instrumentation) shall be as specified in Table I for coal based, diesel engine based and gas turbine based thermal power plants. The contents of training courses and on job training, along with respective duration, shall be as specified in Part II, Ill, IV, V, VI, VII, VIII and IX of this Schedule, appropriate to the .specialized course in mechanical or electrical or instrumentation Engineering. Trainees should speµd time on observing different functions of Thermal Power Plant along with its operation. After the lecture course is completed the trainees should be taken on visits to a few modem power stations and factories manufacturing turbines, generators, switch gear, instrumentation and auxiliary equipment. The remaining period will be spent on in-plant training where the candidates will be given an opportunity to operate or maintain the machinery by themselves under close supervision of the regular operating staff as well as the training supervisors. Arrangements shall be made for familiarizing the trainees with the operation of power stations through_simulator facilities. TABLE I Course Duration for Engineers and Supervisors - flie;~al Power Plants No. I. Common Mechanical, Electrical andinstrumentation Course 2. Common On Job and .Simulator Training for Mechanical, Electrical and Instrumentation 3. Specialized Course for Engineers and Supervisors (a) Mechanical (b) Electrical ( c) Instrumentation 4. Specialized On Job Training for (a) Mechanical (b) Electrical (c) Instrumentation 5. Plant visits and evaluation Coal Base_d Plant 5 Weeks 12 Weeks 6 Weeks 4 Weeks 4 Weeks 4 Weeks 4 Weeks 3 Weeks Diesel Engine Based Plant 4 Weeks. 2 Weeks 4 Weeks 2 Weeks Nil Nil Nil 3 Weeks Gas Turbine Based Plant ... 4½ Weeks 8 Weeks 2½ Weeks 4 Weeks 4 Weeks 4 Weeks. 3 Weeks (ii) The· minimum duration of the training courses for the· Technicians (mechanfoai, electrical and instrumentation trades) to assist the operating engineers and supervisors shall be as specified in Table II for coal based, diesel engine based and gas turbine based thermal power plants. The contents of training courses and on job training, along with respective duration, shall be as specified in Part X, XI, XII, XIII, XIV, XV and XVI of this Schedule, appropriate to the specialized trade of mechanical or electrical or instrumentation Engineering. The lectures may be arranged and trainees may spend time on observation in the power stations so that they get familiarized with different sections of the power statioff After _the lecture course is completed the trainees shall be taken on visits to study a few modem power . stations and factories manufacturing turbines, generators, switch gear, instrumentation and auxiliary equipment. The remaining period will be spent on in-plant training under close super,ision. 3747 Gl/10-33 TABLE II Course Duratiou for Technicians- Thermal Power Plants -SI. Training Course Coal Based Diesel Gas Turbine No Plant Engine Based Plant Based Plattt I. Common Mechanical, Electrical · 4 Weeks 5 Weeks 4 Weeks and Instrumentation Course for Technicians. 2. Specialised Course for Technicians . (a) Mechanical 2 ½ Weeks 2 Weeks 2 ½ Weeks (b) Electrical 2 ½ Weeks 2 ½ Weeks 2 ½ Weeks ( c) Instrumentation 2 ½ Weeks .2 ½ Weeks 2 ½ Weeks 3. Specialised On Job Training for i echnicians (a} Mechanical 16 Weeks 8 Weeks ' 16 Weeks (b) Electrical 16 Weeks 8 Weeks 16 Weeks (c) Instrumentation 16 Weeks 8 Weeks 16 Weeks 4. Plant visits and evaluation 2 Weeks 2 Weeks 2 Weeks s. (b} Hydro Electric Power Stations.- (i) !he minimum duration of the training courses for the operating engineers and supervisors(Mechanical, Elechical and Instrumentation) shall be as specified in Table III for hydro electric power stations. The contents of training courses and on job training, along with respective duration, shall be as specified in Part XVII, XVIII, XIX and XX of this Schedule, appropriate to the specialized course in mechanical or electrical