IS 732 (1989): Code of Practice for ... - Public.Resource.Org

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2 > 0 B Bhart hari N ti atakam Knowledge is such a treasure which cannot be stolen Invent a New India Using Knowledge IS 732 (1989): Code of Practice for Electrical WiringInstallations [ETD 20: Electrical Installation]IS : 732 -1989 ( Reafffinned ) Indian Standard CODEOFPRACTTCEFOR ELECTRICALWIRINGINSTALLATIONS ( Third Revision ) Second Reprint FEBRUARY 1999 UDC : 0 Copyright 1989 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 Price Rs November 1989 Indian Standard ISt732-1989 CODE OF Practice FOR ELECTRICAL WIRING INSTALLATIONS ( Third Revision ) Electrical Installations Sectional Committee, ETDC 20 Chuifmun SHBI M. L. DONQ~E M-3 Satyam, 88 Sion Circle, Bombay 400 022 Members Re#resenti& SHRI P.

3 ANANTHARAMAN Engineet-in-Chief s Branch, Defence ), New Delhi Army Headquarters ( Ministry of SH~I S. K. SHANQARI ( Altrrncte ) SHRI P. D. BA~ADE Tata Consulting Engineers, Bombay SHRI R. K. KAUL ( Allemote) SHRI V. S. BHATIA Siemens India Ltd, Bombay SXRI M. M. SHETHNA ( Alternatr ) SHRI K. V. CHAUBAL Federation of Electricity Undertaking of India, Bombay SH~I KS. JOSHI ( Altesnute ) SHRI R. R. CHOUDHURI Larsen & Toubro ( Construction Group ), Madraa SERI N. BALA~UBRAMANIAN ( Alternate ) CHIEF ELEOTRICAL ENOINEER Railway Board ( Ministry of Railways ), New Delhi DEPUTY DIRECTOR S~ANDA~DB ( ELEO )-DI, RDSO ( At6ernate ) CHIEF ELECTRICAL INSPECTOR TO GOVEBNYIENT Chief Electrical Inspector to Government of Tamil Nadu, Madras OF TAMIL NADU ELEGT~ICAL INSPECTOR ( TEOE~IOAL ) TO GOVERNMENT OF TAMIL NADU ( Alternate ) CHIEF ENGINEER ( ELEC I-1 Central Public Works Department, New Delhi SUPEBINTEN~ENT SURVEYOFC ox WOBEB ( ELEC )-I ( Alfcrnate ) SHRI DEVENDER NATH SHBI T.)

4 P. R. SARYA ( Alternate ) SHRI K. W. DEAR~Y~ADHIKARI DR V. N. MALLER ( Alternate ) SERI G. L. DUA SHBI S. K. SETHI ( Alternate ) SHRI R. C. KHANNA SHBI P. S. SAWHNEY (Altcmatr ) MEMBER ( HYDRO-ELECTRIC ) DIRECTOR ( HED )-I ( Alternate) En S. PANEERSELVAM SERI V. JANARDHANAN ( Alternate ) SHRI K. P. R. PILLAI SHRI C. R. R. MENON ( Altcrnute ) SHRI V. RADHA KRISHNAN SHRI H. S. RAO PROF G. RAVEENDRAN NAIB SHRI S. R. SARDA SHRI R. SATHIYABAL SHRI K. K. MONDAL ( Altcrnatr ) SERI H. K. SITARAM SHRI S. K. PALIT ( Alternate ) SHRI P. SRINIVASA POTI SHRI JOSEPH PHILOYENY ( Alternate ) SHRI D. S. TAWARE SHRI S. J. HARIDAS ( Alfernate ) SHRJ G. N. THADANI SH~I S. K. GHOST ( Alfernuts ) SHRI G. S. THAKUB Larsen & Toubro Ltd, Bombay Jyoti Ltd, Vadodara Rural Electrification Corporation Ltd, New Delhi Delhi Electric Supply Undertaking, New Delhi Central Electricity Authority, New Delhi Tamil Nadu Electricity Board, Madras Fact Engineering and Design Organiiation, Udyogamandal Bharat Heavy Electricals Ltd, Hyderabad Crompton Greaves Ltd, Bombay Chief Electrical Inspector to the Government of Kerala, Trivandrum Maharashtra State Electricity Board, Bombay Tariff Advisory Committee ( General Insurance ), Bombay Calcutta Electric Supply Corporation Ltd, Calcutta Karnataka Electricity Board, Bangalore Electrical Engineer to Government of Maharashtra, Bombay Engineers India Ltd.

5 New Delhi Chief Electrical Inspector, Government of Madhya Pradesh, Bhopal ( Cot&& on pug8 2 ) Q Copyright 1989 BUREAU OF INDIAN STANDARDS This publication is protected under the Indian Copyright Act ( XIV of 1957 ) and production in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act. I ?Sr7SZ-MM9 . ( Continusd from puge 1 ) Chairman SEW V. T. WARAN~ SHRI R. P. PATEL ( Alternuts ) SBRI S. P. SACEDIPV, Director (Elec tech ) Bombay Electric Supply and Trausport Undertaking, Bombay Director General, BIS ( Ex-O&O Member ) s&r4ta?y SERI K. GAH~~SH Deputy Director ( Elec tech ), BIS Panel for Electrical Wiring Installations, ETDC 20 : P30 Convcnrr , SHRI R.

6 K. SEEGAL Mmbm SERI P. S. PANDYA ( Alkmat# to Shri R. K. Sehgal ) Crtxas EN~INBEB ( ELECT )-I SUPERINTENDINQ SWVEYOR OP WORKS ( ELECT )-I ( Alftraetr ) SHRI G. KRISHNASWA~~Y Bombay Suburban Electric Supply Co Ltd, Bombay Central Public Works Department, New Delhi Srta~ A. G. LAK~H*IKABAYANAN ( Alfnnats ) Best and Crompton Engineering Ltd, Madras &tar D. N. PUBAI~DAI~E SHRI SHIRISH S. JEAV~I ( A&act8 ) Electrical Contractor s Association of Maharashtra, Bombay SHRI K. P. R. PILLAI SHBI A. 0. 00-n ( Atrrmotr ) Fact Engineering and Design Organization, Udyogamandal P~olr G. RAVE~DRAN NAIIC Chief Electrical Inspector to the Government of Kerala, Trivaudrum SHEX R. SATHIYABAL Tariff Advisory Committee, Bombay SHBI K. K. MONDAL ( Affemat6 ) SHRI M. K. THADANI Engineer-in-Chief s Branch, Army Headquarters, New Delhi SHRI R.

7 K. Snar ( Al@rnefr ) SEBI G. N. THADANI Engineers India Limited, New Delhi SHBI S. K. GHOSB ( dlwmzf~ ) 2 IS t 132 - 1989 CONTENTS 0. FOREWORD 1. SCOPE Page .. 5 .. 6 2. SECTION 1 TERMINOLOGY TERMINOLOQY .. 6 SECTION 2 ASSESSMENT OF GENERAL CHARACTERISTICS OF INSTALLATIONS 3. ASSESSMENT OF CHARACTERISTICS - GENERAL 4. EXTERNAL INFLUENCES SECTION 3 PROTECTION .. 12 .. 13 FOR SAFETY 5. REQUIREMENTS FOR PROTECTION FOR SAFETY ,.. 19 SECTION 4 DESIGN OF INSTALLATION, SELECTION AND ERECTION OF equipment 6. 7. 8. 9. 10. 11. FUNDAMENTAL REQUIREMENTS .. COMMON RULES .. CABLES, CONDUCTORS AND WIRING MATERIALS .. SWITCHGEAR * .. EARTHING ARRANQEMEMT AND PROTECTIVE CONDUCTORS .. supplies FOR SAFETY SERVICES .. 39 41 43 49 51 51 SECTION 5 INSPECTION AND TESTING 12.

8 13. INITIAL INSPECTION AND TESTING .. ALTERATIONS TO INSTALLATIONS .. 52 54 54 60 APPENDIX A APPENDIX B APPENDIX C APPENDIX D APPENDIX E TYPES OF WIRING SYSTEMS AND THEIR SELECTION .. METHODS OF INTERNAL WIRINQ GUIDELINES FOR SPECIFIC equipment , FITTIN@ AND ACCESSORIES .. SPECIFIC GUIDANCE OF SELECTION OF equipment WITH REGARD TO EXTERNAL INFLUENCES .. CHECK LIST 0~ INITIAL INSPECTION .. 68 70 74 As in the Original Standard, this Page is Intentionally Left Blank IS : 732 - 1989 Indian Standard CODE OF Practice FOR ELECTRICAL WIRING INSTALLATIONS ( Third Revision ) 0. FOREWORD This Indian Standard was adopted by the Bureau of Indian Standards on 25 January 1989, after the draft finalized by the Low Voltage Switchgear and Controlgear Sectional Committee had been approved by the Electrotechnical Divi- sion Council.

9 The Indian Electricity Rules, together with the supplementary regulations of the state electri- city departments and electricity undertakings, govern the electrical installation work in build- ings in this country. Regulations for the electrical equipment in buildings as recommended by the Institution of Electrical Engineers, UK, have also often been followed in this work. Expanding use of electricity and increase in the number of elec- trical installations in buildings, necessitated the preparation of a code of Practice to guide and govern installation of electrical wiring in build- ings, with particular reference to safety and good engineering Practice . This code was, therefore, first published in 1958 with the above objective. Since the first version of this code covered electrical installations only in buildings which could be considered as non-industrial locations, where the system voltage generally did not exceed 650 volts, the need for having a similar code for industrial locations was also felt and many addi- tional requirements had to be looked after.

10 There- fore, in addition to the revision of this code, a separate code on the latter subject was published as IS : 2274-1963 . Experience in implementation of these stan- dards had proved that most of the industrial installations required references to guidelines for system of voltages not exceeding 650 V in their design. Moreover, considerations such as layout of electrical installations, measurement, etc, for which separate Indian Standard specifications exist, require comprehensive reading, and it has been felt that a single Indian Standard to provide for all aspects of wiring would serve as a com- prehensive reference guide on the subject. In the second version of IS : 732 brought out in 1982 in 3 parts, this fact has been taken into *Code of Practice for electrical wiring installations ( system voltage exceeding 650 volts ).