Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

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“Invent a New India Using Knowledge”

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“Step Out From the Old to the New”

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“The Right to Information, The Right to Live”

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“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 10118-1 (1982): Code of Practice for Selection,Installation and Maintenance of Switchgear and Controlgear, Part I: General [ETD 20: Electrical Installation]

IS : 10118 ( Part I ) - 1982

Indian Standard

CODE OF PRACTICE FOR SELECTION, INSTALLATION AND MAINTENANCE OF

SWITCHGEAR AND CONTROLGEAR

PART I GENERAL

( Second Repririt JULY I990 )

UDC 621.316.3/.7.004:006.76

@ Copyright 1982

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI llRlU2

Cr 3 December 1982

CODE OF PRACTICE FOR SELECTION,

IS : 10118 ( Part I ) = 1382

Indiun St;nn~drtrd

INSTALLATION AND MAINTENANCE OF

SWITCHGEA R AND CONTROLGEAR

PART I GENERAL

Clodc of Practice for Power Installation arld Maintcnamx Section& Commiltee, ETDC 20

Chairman

SHRI K. K. BOSE

Members

Re~resefrlif~g

Calcutta Electric Supply Corpor.tlion Ltd, C:alcutta

SHRI A. t%ATTERJlX ( Allarnafa to Shri K. K. Bose )

SHRI B. C. ALVA Snar T. N. R. RAO ( Al&mule )

Karnataka Elcctiicit,; Board, Bangalorc

SIUU M. J. ANANDAMURTHY Chief Electrical IttsLiector to the t;o\crummt ot ‘I’amil Nadu, Madras

ELFGTRICAL INSPECTOR ( TECHNI~AI. ) ~0 TWE GOVERNWWT OF T-1. NADU ( Al&mats )

SHRI P. D. BAOME SHRI R. C. BAJPAL ( Alfemale )

Ta~a”Cansulting Engineers, Bomba!

SHRI V. S. BEIATIA Siemens India Ltd, Bombay SHRI K. K. PANT ( Al&rnnte )

SHRI K. V. CHAUBAI. The Federation of Electricity Undertakings of India. Bombay

SHRI K. S. Josm ( Al&mate ) CHIEF ELE(;TRICAL ENGINEER Railway Board, Ministry of Railways

DEP~Y D~ECTOR STANDARDS ( ELEC ) - IV, RDSO ( dllernnle )

CHIEF ENGINEER ( ELEC )-I Central Public Works Dcpartmcnt, New 1 )dhi %,RVEYOR OF WORKS ( Erxc )-I ( Al&mate )

YRRI B. L. DESHPANDE Rlcctrical Engineer to G_~vr:rnrur~~~t of M;th.rrashtr.r, Bombay

Surr DY.VP.NDBR Narrr Larsen & Toubro Ltcl, Butnb~y SHRI T. P. R. SARMA ( Alternate )

SHRI K. V. DHARMADIIIICARI Jyoti Ltd. Vadodara Srrnr D. J. HASTAK Maharashtra State Electricity boards, Bombay

p?J Cnpyright 1982

BUREAU OF INDIAN STANDARDS

This publication is protected under the ( d n ian Copight Act ( XIV of 1957 ) and

reproduction in whole or in part by any means except wit11 writtcu permiaiou of the

publisher shaU be deemed to be an infringement of copyright under the said Act.

.

IS : 10118 ( Part I ) - 1982

SHW S. K. ~JCRANI;.W ( Alternutc 1 SHII I. c. SAWPR Delhi Electric Supply Undertaking, New Delhi -_ .

8UKI P. s. SAl\‘IINCY ( Ah?tU/fe ) v_

51lKl s \RPrlL Sl?inll Chief Electrical Inspector to the Govcrmuent ol l’lmjab, Chandigarh

S,\I:Il\,r I). s. [!1’1’.\1. ( .I//r,mt/,~ ) SIlkI \‘. S.VI,,,.\N,\.I’II.\N T;unil Nadu Elcci1-icity Boartl, Madras

Sll~<l s. Kl<ISllN.\l<.\~ ( .UkJIllllt! )

SlIkl 12. S‘WYAU.\I. ‘I’at,ill’ Advisory Committee, Gnlcral Insurance .\ssociation of India, Bombay

SIlKI K.. K. A3ml)nl. ( .I//f,r/olc ) Sintl P. K. S.ZXENA Rural Elcctrilication Corporation Ltd, New Drlhi

SIIRI S. 1.. Du.z ( ;Ilkvt/o/c ) I )I< ‘1’. c:. S1r,r34w Chief Electrical Inspector to the Goverumcnt ol

I&ala, Trivandrum SIIHI K. S. S~~IIK.~HMANIYAM Bharnt Heavy Electric& Ltd. Sccunderabacl

SARI G. P. PAHWA ( Altertdr )

SIIRI G. N. THADANI Ellgineers India Ltd, New Delhi SHRI S. G. GOKHALE ( .4/tPWll/E )

SHRl S. VAIUYANATHAN K;rr:ll;~ State Electricity Boards, Trivandrum SHRI l<. VARADARA~AN ( .I//e~tm/c )

SHRI S. P. S.WHDFY. Director Gcncral. IS1 ( Ex-I$% A~cnrbcr ) Dircx~lor ( Elcc tech )

SHRI K. GANERH

Assistant Dircclor ( Eler trrh )? ISI

SHRI 0. I’. .\NANo DClhi SHRI JAGMOHAN ( dlfarnntc )

.

IS : 10118 ( Part I ) - 1982

Indian Standard

CODE OF PRACTICE FOR SELECTION, INSTALLATION AND MAINTENANCE OF

SWITCHGEAR AND CONTROLGEAR

PART I GENERAL

0. FOREWORD

0.1 This Indian Standard ( Part I ) was adopted by the Indian Standards Institution on 26 February 1982, after the draft finalised by the Code of Practice for Power Installation and Maintenance Sectional Committee had been approved by the Electrotechnical Division Council.

0.2 The object of this series of standards is to provide guidelines for the selection, installation and maintenance of switchgear and controlgear and itssociated equipment.

0.3 It has been generally felt that the requirements of switchgcar of different voltage ratings can be conveniently covered in a single standard. Keeping this in view, the Indian Standard IS : 3072-1975” was brought out to cover equipments for indoor and outdoor use. Equipments so covered included circuit-breakers, isolators and other switches operating on ac or dc. Separate Indian Standards had been formulated as follows, for detailed Codes of Practices for fuses, ac induction motor starters, high voltage ac circuit-breakers and other switches :

IS : 3106-1966 Code of practice for selection, installation and mainten- ance of fuses ( voltage not exceeding 650 volts ),

IS : 3914-1967 Code of practice for selection of ac inductor motor starters (‘voltage not exceeding 1 000 volts ),

IS : 5124-1969 Code of practice for installation and maintenance of ac induction motor starters ( voltage not exceeding 1 000 V ),

IS : 5987-1970 Code of practice fnr selection rif switches ( voltage not exceeding 1 000 V ), and

IS : 7987-1976 Guide for selection of high voltage ac circuit-breakers,

*Code of practice for installation and maintenance of switchgear (/irrt r&ion ).

3

.

IS : 10118 ( Part I ) - 1982

0.4 This Indian Standard is being brought out wit11 a virw to presenting in a cogent fashion, the Codes of Practice for variotls ~ypcs of switchgeal and contiolgear used in electric power system, filling up the gaps bctwcen these specifications, utilisin, (7 tile latcsl in concepts inlrcdllccd in tllc prodlicl spcrifications.

0.5 This standard prcscnts the sul)jc:ct prodtlct-wise, brin@ng OII~ therclcvanl ~c,od practices rccomn~cntlt:c1 li)r LT and HT ;rppllc;ttiorls scpal,ately. ‘rllis standarc is 1Gyg I~i~c~uglit 0111 in fo11r parts, nan~el!~:

Parr I General, Part II Select ion, Part III Installation, nlld Part IV Mai~ltcnance.

Nl these parts shall be read in conjunction with each other.

0.6 In the preparation of this standard, considerable assistance has been derived from the information coutainccl in the Indian Standards listed in 0.3. <>n publication of this slatidartl ( Paris I to IV ), the Indiatl Stand- ards in 0.3 would stand withdrawn.

0.7 During the drafting of the various parts of this standard, 111~ expert Panel, responsible for the same, had kept in view the fact that this standard could at best give guidance on the bulk of the equipment used in the country and should be understood in the manner; that aspects relating to selection, installation,or maintenance of EHV equipment as well as those intended for very special application would have to bo supplemented with additional data, not attempted by the present series.

0.8 For the purposes of’ready reference, a list of product specifications covering switchgear and controlgear equipment are given in Appendix A. The Codes of practice, read together with the relevant Indian Standard specification on the equipment would provide the necessary guidelines.

0.9 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test, shall be rounded off in accordance with IS:2-1960*. The number of significant places retained in the rounded off vnluc should be theaame as that of the specified value in this standart].

1. SCOPE

1.1 This standard ( Part I ) covers the general aspects pertaining to the selection, installation and maintenance of’ all types of switchgrar and controlgear for indoor and outdoor USC.

*Rules for rounding off numerical values ( r&cd ).

4

IS : 10118 ( Part I ) - 1982

1.1 For the purposes of this standard spc:ci;Jl ~ypt~ oI‘ ecluipmm!~ >I:VII ;IS those: intended for 115~ in hnx;u&~s ;ttlllc)spherc*s UC c:xcludc:d. P-I,\ iFion\ fix the same are provided in separate Indian ~ta~~dmc~s.

1.3 Specific provisions r&&rig (0 the Jx.;lctices Li)r indicidual equipments, and equipments for individual applicatio~ls in J’CSpCC’t ol‘ sclectioJl and installation and mnintcnancc li)rJn the scope of sul~scq~~cnt parts ol’ this standard.

2. TERMINOLOGY

2.1 FOJ’ the purpox of this stmdarcl, the dcfinilions given in IS: 1885 ( Part XVII )-1979” shall apply.

3. GENERAL PROVISIONS

3.1 Exchange of Information 1

3.1.1 BeCore ordering the plant, inlbl Illatioll :;ltould IN: cxchangcd between the owner, architect, eq.$neer and ecJlLiJ)Incnt manufacturer responsible for its design, procurement, installation, operation and maintcn- ante, so that the plant is procurccl to suit the dotty, location nnd installa(ioJl conditions under which the switchgcar will olxratc. This infbrma~ioll should include any special bui1din.g features, sucll ;I:, access tloo~x, lil‘tirlg. beams, oil pumps, cable trenches, foundali’on details, vcntilatilkg arrangc- ment, weather conditions, etc, which In;ly be desirable ( .,ee also Part II and III of this standard ) as also the incorJ)orarion of‘ any optional lix~urc:s

in the switchgear.

3.1.2 Details of the electric supply available and of any special require- ment regarding the rating of equipment which may. he connected to the: supply should be ascertained from tllc supply aulliorlty.

3.2 Transport Facilities

3.2.1 The engineer slmultl oblaill well in advance all rc:lt:vartt inkrITliltioJ1 about the overall dinxnsions, wr:igllt fix transport, installation, ctc, of the switchgear in question. Special precautions may be essential for lhc protection of insulation during shipment and prior to energizing to prevenl moisture absorption due to rain, snow or condensation. These may include shipment of insulating parts in oil to prevent contamination. Appropriate instructions should be given in this regard. When the circuit-breaker is dismantIed for transport, all parts should be clearly marked, drawings showing assembly of these parts and a packing list should Ix supplied to the user.

*Electrotechnical vocabulary: Part XVII Slvitchgear and controlgear (,l;rst rcuision 1.

5

--

JS : 10118 ( Part I ) - 1982

3.3 Drawings, Materials and Appliances

3.3.1 ‘1’1~ Illilllllfi~CllltX1. dlodd provide tlrawin~s and~instructions lor I IN: illslallation and maintcnanco of switchgear well in advance of lhc: time of delivery. It is essentiai that the installation of switchgear as well as its maintenance in service is performed in accordance with the provisions of the rclcvant Indian Standard or the instructions given by the manIl- l;lcturc:r.

3.3.2 All materials, fittings, apparatus, etc, used in the installation shall conform to relevant Indian Standard specifications wherever they exist, and in the case where they do not exist, the items shall be approved by competent authority.

4. SAFETY AND STATUTORY REGULATIONS

4.1 Compliance with Indian Electricity Rules and Other Regu- lations

4.1.1 All clcctrical installations shall comply with the requirements of the Indian Electricity Act and Rules made thereunder and with other regulation. Such as those made under Factory Act, 1948 and Fire Insurance :!ct, that may be applicable. The following rules of Indian Electricity Kules 1956 are particularly applicable:

No. 29, 33, 34, 35, 36, 50, 51, .61, 62, 63, 64, 65, 67, 69 and 114.

4.1.2 If considered necessary the local authorities concerned in the administration of the rules and regulations in the matter of the layout of the installation of the switchgear should be consulted in regard to the rules and regulations that may be applicable.

4.1.3 The electrical installation shall be carried out only by authorized persons competent to undertake such work under the rules and regulations that may be in force in different States.

4.2 Earthing

4.2.1 It is absolutely essential that the entire earthing system should be &signed with regard to the maximum available earth-fault current. This should be particularly checked whenever any plan extensions resulting in higher faGlt levels are made to ensure that the existing connections are suitable for the increased earth-fault current.

4.2.2 For additional details regarding earthing and size of earth bus and conductor, reference shall be made to IS : 3043.1966*.

*Code of practice for earthing.

6

IS ! 10118 ( Part I ) - 1982

4.4 Lightning Protection - Whcrc ronsidcrecl appropriate, the necessary l)t.cc;lIltions shall be taken tc, cn<111’(: ~IKII 1i1c installation oL‘ switchsc-ar ;rntl con~rol,gcar shall bc protcrtctl H~III lightning surges. Ccncral guidclmcs arc available in IS : 2309-1969*.

4.5 Oil Drainage -- For indoor switchgear, an oil soak pit shall be pro- vidcd where a single chamber of indoor switchgcar has an oil capacity of’ tltorc than 2 000 litres. For outdoor switchgear, suitable arrangement for (lrainagc of oil shall be made.

5. CATEGORIZATION OF EQUIPMENT

5.1 It is an accepted practice to broadly classify switchgear and controlgear equipment based on rated voltage. Low voltage switchgear and controlgear arc those intended for rated voltage up to and including 1 OOOV ac 01 1 200 V dc, and high voltage switchgear and controlgcar arc those intended l;)r voltages above 1 000 V ac.

Individual equipment are further classified depending on the method (~1’ operation or on the type of construction. Product classifications arc covered in Part i1 of this standard.

APPENDIX A (Clause 0.8 )

INDIAN STANDARDS ON SW’ITCHGEAR AND CONTROLGEAR

A-l. LOW VOLTAGE SWITCHGEAR AND CONTROLGEAR

IS: 375-1963 Marking and arrangements fi)r switchgcar busbars, main

connections and auxiliary wiring ( revised) 13.56 ( Part I )-1972 Electrical equipment of machine tools: Part I

Electrical equipment of machines for general use ( secmd

revision ) 1885 ( Part XVII )-1969 Electrotechnical vocabulary: Part XVII Switch-

gear and controlgear

*Code of practice for the protection of buildings and allied structures agaimt lightning ( fivst reuiriotl ) .

7

IS : 10118 ( Part I ) - 1982

0544 ( Part I )-1977 Motor starters for voltages not exceeding 1 000 V: Part I Direct-on-lint ac starters

8544 ( Part II l-1977 Motor starters for voltages not cxcecdine 1 OOOV

8544. ( Part

8514 ( Part

8544 ( Part

Pakt II Star-delta starters -’ III/Set 1 )-1979 Motor starters for voltages not cxcc~ctling I 000 V: Part III Kheostatic rotor starters, Sect ion 1 Gcnc~l requirements III/Set 2 )-1979 Motor starters for voltages not cxcrcrlitlg 1 000 V: ParL III Kheostatic rotor starters, Section 2 hdtlirion;~l requirements for ac rheostatic rotor con~rdlws IV )-I979 Motor starters for voltages not exceeding 1 000 V: Part IV Kcduccd voltage nc starters: Two-step ;u~to-1 r;u1Ji~- mer starters

8508 ( Part

8623 ( Part

I )-1977 Thermostatic bimclnls: l’;rr~ I Gcll(*t’al t.c.cl~til.~ulc:tlt~ and methods of tests

8623 ( Part

8724-1978 8828-1978

I )-1977 Factory-built assemblies 01‘ switchgcsar ;~II(I control- gear for voltages up to and inclutlin~ I 000 V ;I(’ ;UNI I !&NJ V dc: Par1 I General requirements II )-1980 Factnry-built assemblies ol’switcllgcar antI c:onl~~ol- gear for voltages up lo and including I 000 V ac ;IIN.~ 1 200 V dc: Part II Particular rcquirc.rncnts for l~~sl~;u~ rrultkillg systems ( busways ) Dimensions for rewirablc 1Lscs up 10 GXJ V Miniature air-break circuit-breakers for voltages not c~~:rli~lg 1 000 v

9224 ( Par1 I )-I979 Low voltage fuses: Part I General I,cquironcnts 9224 ( Part II )-1979 Low voltage fuses: Part II Supplementary require-

ments for fuses with hi,?11 breaking capacity for industri:l! application

9224 ( Part IV )-1980 Low voltage fuses: Part IV Supplementary rcquiw- ments for fitse-links for t hc protection ofselniconrlllctor tl(avicc:s

A-2. HIGH VOLTAGE SWITCHGEAR AND CONTROLGEAR

375-1963 Marking and arrangements for xwitchgcar bllsbars, nlain connections and auxiliary wiring ( rehed )

1818-1972 Alternating current isolators ( discnnncctors ) and earthin!< switches ( J%SL revision )

1885 ( Part XVII )-1979 Electrotechnical vocalntlary: Part XV11 S\\,itch- gear and controlgear

2032 ( Part VII )-1974 Graphical symbols used in etectrotc~l~u~~lo~~~: Part VII Switchgear and auxiliaries (first revision )

2516 ( Part I/Set 2 )-1980 Circuit breakers: Part I General and (I&- nitions, Section 2 For voltages above 1 000 V ac

2516 ( Part IT’Sec 2 )-1980 Circuit-breakers: Part II Rating, Section 2 I’:c voltages above 1 000 V ac (first r&&/l )

9

IS : 10118 ( Part I ) - 1982

2516 ( Part

2516 ( Part

2516 ( Part

3427- 1 WI)

4710-1968

5561-1970 7567-l 975

8084-1976

904-6-l 978

9135-1979

93fl5 ( Part 9385 ( Part

9385 ( Part

9402- 1980

9920 ( Part

III/Set 2 )-1980 <:ircuit-breakers: Part III Design and con- struction, Section 2 For voltages above 1 000 V ac (first revision) IV/Set 2 )-1980 C:ircuit breakers: Part IV Type tests and routine tests, Section 2 For voltage above 1 000 V ac V/Set 2 )-1980 Circuit-breakers: Part V Information to be given with enquiries, tenders and orders and rules lbr transport, erection and maintenance, Section 2 For voltages above 1 000 V ac ( jrst revision ) Metal-enclosed switchgear and controlgear for voltages above 1 000 V but not exceeding 11 000 volts Switches and switch isolators above 1 000 V but not cxceetling 11 000 v Electric power connectors Automatic reclosing circuit-breakers ( automatic circuit re- closers ) for ac distribution system Interconnecting busbars for ac voltage above 1 kV up to and including 36 kV Specification for ac contactors for voltages above 1 000 V up to and including 11 000 V Guide for the testing of circuit-breakers with respect to out-o(l phase switching I )-1979 High voltage fuses: Part I Current-limiting fuses II )-1980 High voltage fuses: Part II Expulsion and similar fuses III )-1980 High voltage fuses: Part III Application guide for high voltage fuses High voltage fuses for the external protection of shunt power capacitor I )-1981 Alternating current switches for voltages above 1 000 V: Part I General and definitions

10

IS t 10118 ( Part I ) - l!@

Yontinucd from page 2 )

Repwcnting

SHRI c. R. BALWUHRAMANIAN SWRI M. SSSHADRI* ( Alkvnnte )

SHRI DEVENDER NATH SrrRI P. D. JAHACXRDAK SHHI .JAvew AHMED

The English Electric C:ompaq, of India Ltd, hladras

Larsen & Toubro Limited. Bornlx~y hdaharashtra State Electricity Bo;utl. llotnl.~;ly NC;W .I,td, Bnngnlorc

SHRI I. NARAYANA HAO ( A/cntnlc ) ~HRI K. P. SARATHY ( Alfrrna!e )

111: T. C. SIDHAN Chief Elcctriwl Inspector to tlw Oo~ernmct~t of’ Kerala, Trivandrum

PROF. G. RAVINDRAN NAIR ( .4/fenrcrte ) SHRI SYED KHADER MOIIUDDI~ Karnataka Elcctriciiy Board, Ba~~q:~lorr~ SARI R. SUBBA RAO Bharat Heavy Electricals Ltd, SwuntlwLtlutL

SHRI P. s. L)AS ( .‘hrMtC )

SHRI K. C. LAHARI ( .4ltertmte ) SHRI G. N. THADANI Etlginecrs India Ltd, New llelhi

SHRI M. K. DAS ( .4/te,uute ) SIIRI A. S. UDHALIKAR Hindustw Brown Boveri Ltd, Bombay

S~IRI S. R. POTNIS ( .Iltotlatc )

*Shri M. Seshadri, chaired the panrl meetings.

11

.

,J-fi DIAN STANDARDS

ON

CODE OF PRACTICE FOR POWER INSTALLATION AND MAJ.NTENANt

I$: 732-1963 Code ofpractice for electrical wiring installations ( system voltage not exceeding

650 volts ) ( reoiscd ) 900-1965 Code of practice for installation and maintenance of induction motors ( rcuirud)

1866-1978 Code of practice for maintenance and supervision of insulating oil in service ( first rc-uision )

1885 ( Part XXX )-I971 Electrotechnical vocabulary: Part XXX Ovcrhcad transmission and distribution of electrical energy

1885 ( Part XXXVII j-1974 Electrotechnical vocabulary: Part XXXVII Tariffs for

( electricity

1886-1967 Code of practice for installation and maintenance oftransformers (/irst rauision ) 1 2032 ( Part XI )-1970 Graphical symbols used in electrotechnology: Part XT Electrical

2274-1963

2309-1969

2551-1963 3043-1966 3072-1975 3106-1966

3914-1967

4648- 1968 5124-1969

Code of practice for selection of ac induction mbtor starters (voltage not exceeding 1 000 volts ) Guide for electrical layout in residential buildings Code of practice for installation and maintenance of ac induction motor starters ( voltage not exceedings 1 000 volts ) Guide for safely procedures and practices in electrical work - . . ^. . . . .52 16 1969

.i578-1970 tiulde tor markmg of msulated conductors 5613 ( Part I/Set I )-I970 Code of practice for design, installation and maintenance 01

overhead nower lines: Part I Lines uuto and including I1 kV, Section 1 Design

installat ions in buildings Code of practice for electrical wiring installations ( system voltage exceeding 650 volts\ Code of plactire for the protection of buildings and allied structures against lighting (,fint r&ion ) Danger notice plates Code of practice for earthing Code of practice for installation and maintenance of switchgear ( jrsl reuitiun ) Code of practice for selection, installation and maintenance of fuses ( voltage not exceeding 650 volts )

5(j13 ( Part I/Set 2 )-i97l Code of practice fo; design, installation atid maintenance bf overhead power lines: Part I Lines up to and including I1 kV, Section 2, Installation and maintenance

2613 ( Part II/Set 1 J-1976 Code of practice for design, installation and maintenance of overhead Dower lines: Part II Lines above 11 kV and up to and including 220 kV, S&tion I Design

5613 ( Paft II/Set 2 J-1976 Code of practice for design, installation and maintenance of overhead power lines: Part II Lines above I1 kV and up to and including 220 kV. Section 2 Installation and maintenance

5728- 1970 Guide for short-circuit calculations 5908-1970 Method of measurement of electrical installation in buildings .5987-1970 Code of practice for selection of switches ( voltage not exceeding 1 UOU V ) 7689-1974 Guide for the control of undesirable static electricity 7733-1975 Code of practice for electrical wiring installation in hospitals 7752 ( Part I j-1975 Guide for improvement of power factor in consumer installation:

Part I Low and medium supply voltages Guide for selection of high voltage circuit-breakers Code of practice for design, installation and maintenance of service lines up to and including 650 V

7987-1976 8061-1976

8437-1977 8884-1978 8923-1978 8969-l 978

951 I-1980

Guide on effects of currents passing through human body Code of practice for the installation of electric bells and call system Warning symbol for dan emus voltages Code of practice for insta lation P and maintenance of impulse and electronic master and slave electric clock systems Earth knobs for neutral conductors.

.

BUREAU OF INDIAN STANDARDS

Headquarters:

Manak Bhavan, 9 Bahadur Shah Zafar Marg, NEW DELHI 110002

Telephones: 331 01 31, 331 13 75 Telegrams: Manakranstha ( Common to all Offiie8)

Regional Offices: Telephone Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg,

NEW DELHI 110002 : l/l 4 C. 1. T. Scheme VII M, V. I. P. Road,

I

331 01 31 331 1375

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Northern : SC0 445-446, Sector 35-C,

1

21843 CHANDIGARH 160036 3 1641

41 24 42 Southern : C. I. T. Campus, MADRAS 600113

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BOMBAY 400093

Branch Offices:

#Pushpak’, Nurmohamed Shaikh Marg, Khanpur,

I

2 63 4% AHMADABAD 380001 2 63 49

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Z33 44: fi

Gangotri Complex, 5th Floor. Bhadbhada Road, T. T. Nagar, I

667 16 BHOPAL 462003

Plot No. 82183. Lewis Road. BHUBANESHWAR 751002 531’5. Ward’ No. 29, R.G. Barua Road, 5th Byelane,

GUWAHATI 781003

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23 1083

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Patliputra Industrial Estate. PATNA 800013 T.C. No. 14/l 421. Universitv P.O.. Palayam

TRIVANDPUM 695035

/nspection Offices ( With Sale Point ):

i 63471 6 98 32

i 3; “et ;: 6 23 05

1s 21 04 16 21 17

2 51 71 Pushpanjali. First Floor, 205-A West High Court Road, Shankar Nagar Square, NAGPUR 440010

Institution of Engineers ( India ) Building, 1332 Shivaji Nagsr, 5 24 35 PUNE 411005

l SeIes Office in Calcutta is at 6 Chowringhrr Approach, P. 0. Princep 27 68 00 Street. Cslcurra 700072

tSslsr Office in Bombay ir et Novelty Chrmbore, Grant Road, 89 66 28 9ombay 400007

iSales Office in Bangalore is at Unity Building. Neraaimharaja Square, 22 36 71 Bangatore 560002

Reprography Unit, BIS, New Delhi, India