IS 732 (1989): Code of Practice for Electrical Wiring ...

1 Disclosure to Promote the Right To InformationWhereas 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.

2 ! $ ' + - Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge 0 1 ' 5 Jawaharlal Nehru Step Out From the Old to the New 1 + , 1 + Mazdoor Kisan Shakti Sangathan The Right to Information, The Right to Live ! > 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.

3 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. ANANTHARAMAN Engineet-in-Chief s Branch, Defence ), New Delhi Army Headquarters ( Ministry of SH~I S. K. SHANQARI ( Altrrncte ) SHRI P.

4 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.)

5 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.

6 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 )

7 , Bombay Calcutta Electric Supply Corporation Ltd, Calcutta Karnataka electricity board , Bangalore Electrical Engineer to Government of Maharashtra, Bombay Engineers India Ltd. 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.

8 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. 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.

9 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.

10 K. MONDAL ( Affemat6 ) SHRI M. K. THADANI Engineer-in-Chief s Branch, Army Headquarters, New Delhi SHRI R. 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.