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( Reaffirmed 2004 ) IS : 9431- 1979 Indian Standard SPECIFICATION FOR INDOOR POST INSULATORS OF ORGANIC MATERIAL FOR SYSTEMS WITH NOMINAL VOLTAGES GREATER THAN 1000 V UP TO AND INCLUDING 300 kV Electrical Insulators and Accessories Sectional Committee, Representing Ministry of Energy ETDC 3 Chairman SRHI L. C. JAIN Mf3nb#rs SRRI V. R. ANANTHAIIU(AYANAN Bengal Potteries Ltd, Calcutta SHRI CHANDER PARKASH ( Alternate ) All India Pottery Manufacturers’ Association, SHRI B. C. BANERJEE Calcut
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  Reaffirmed 2004  IS : 9431- 1979 Indian Standard SPECIFICATION FORINDOOR POST INSULATORS OFORGANIC MATERIAL FOR SYSTEMS WITHNOMINAL VOLTAGES GREATER THAN 1000 VUP TO AND INCLUDING 300 kV Electrical Insulators and Accessories Sectional Committee, ETDC 3 ChairmanSRHI L. C. JAIN Mf3nb#rs Representing Ministry of Energy SRRI V. R. ANANTHAIIU(AYANAN Bengal Potteries Ltd, Calcutta SHRI CHANDER PARKASH ( Alternate ) SHRI B. C. BANERJEEAll India Pottery Manufacturers’ Association,Calcutta SHRI B. C. DAW ( Alternate ) SHRI D. S. CHABHALDirectorate General of Technical Development,SHRI R. T. CRARINew DelhiTaa Corporation. Madras SHRI A. GURUPATHAD~ Alternate ) - - SHRI K. S. CHELLAPPANTamil Nadu Electricity Board, MadrasSHRI N. R. SANKARAN Alternate ) SHRI A. K. CHOPRAPunjab State Electricity Board, PatialaSHRI NIRVAIR SINGE ( Alternate ) SHRI A. N. DEBDamodar Valley Corporation, Calcutta SHRI A. C. Bosh ( Alternate ) DIRECTOR OF RESEARCH ( T & D ) Maharashtra State Electricity Board, BombayDIRECTOR (TRACTION ANDResearch, Designs and Standards Organization,INSTALLATION )Ministry of Railways, LucknowJOINT DIRECTOR STANDARDS ( Tl ) (Alternate ) DIRF;~;~ ~R~ANSMSSSIONCentral Electricity Authority, New DelhiDIRECTOR( SUBSTATION ) ( Alternate ) GENERAL MANAGER ( T )Directrorate General of Posts & Telegraphs,JabalpurDIRECTOR OF TELEGRAPHS ( L ) ( Alternate I )DIVISIONAL ENQINEER TELEORAPHS ( C )( Alternate II )( Continued on page 2 ) Q Copyright 1980INDIAN STANDARDS INSTfTUTIONThis publication is protected under the Indian CopVright Act ( XIV of 1957 ) andreproduction in whole or in part by any means except with written permission of thepublisher shall be deemed to be an infringement of copyright under the said Act.  IS : 9431 - 1979 ( Continued from page 1 ) MembsrsRepresenting SARI B. N. GaosnBharat Heavy Electricals Ltd, BhopalSri&r H. M. S. LINGAIAHKarnataka Electricity Board, BangaloreSHRI G. S. MAHAQAONKARMysore Porcelains Ltd, Bangalore SHRI S. K. MUKHERJEENational Test House, CalcuttaSIXRI U. S VERMA ( Alternutc ) DR G. M. PHADKEIndi~om~ctrical Manufacturers’ Association,SEXI C. R. VA~RIER ( Ahrnate ) SHRI P. S. RAMANNGEF Ltd, Bangalore SHRI E. P. WILFRED ( Alternatc ) SHRI M. SANEARALLNOAMDirec$or$;el~eneral of Supplies & Disposals,DEPUTY DIRECTOR OR ~NSPECTIO~~r~~~rnatC ) SHRI P. K. SAXENAElectrification Corporation Limited,New DelhiSERI G. L. DUA (Alternate)SERI N. S. SEETHURAMONW. S. Insulators of India Ltd, MadrasSHRI V. S~INIVASAN ( Alternate ) DB U. S. SINQHHigh Tension Insulator Factory, RanchiSHRI A. D. DUA ( Alternate ) SERI SURENDRA SINUHU. P. Government Pottery Development Centre,KhurjaSERI T. B. L. SRIVA~TAVA ( AItcrnatc ) SEERIL. VENKATESUBBUSeshasavee Industries Ltd, Vadalur, South ArcotDistrictSERI R. V. ACHUTHAN ( Altcrnate) SHRI S. P. SAOHDEV,Director General, IS1 ( Ex-@icio Member) Director ( Elec tech ) Secretary SHRI R.S. SARMA Assistant Director ( Elec tech ), ISI Panel for Dimensions of Bushings, ETDC 3/P3Convcnrr SHRI V. SRINIVASANW. S. Insulators of India Ltd, Madras Members SHRI K. N. JAYARAMMysore Porcelains Ltd, Bangalore SHRI S. V. MANERIKABCrompton Greaves Ltd, Bombay SERI M. L. MITTALBharat Heavy Electricah Ltd, Bhopal SHRI S. P. SINGE ( Alternate) SHRI R. G. PRADHANANIBharat Bijlee Ltd, Bombay SERI P. RAMACEANDRANTran;:&t;e; &zGElectricals Kerala Ltd, Angamally * ’ HRI KURIAKOSE ANTONY ( Alternate ) SHRI P. S. RAMANDR U. S. SINGE NGEF Ltd., BangaloreHigh Tension Insulator Factory, RanchiSRRI A. D. DUA ( Ahrnate )  IS : 9431.1979 Indian Standard SPECIFICATION FORINDOOR POST INSULATORS OFORGANIC MATERIAL FOR SYSTEMS WITHNOMINAL VOLTAGES GREATER THAN 1000 VUP TO AND INCLUDING 300 kV 0. FOREWORD 0.1 This Indian Standard was adopted by the Indian StandardsInstitution on 16 November 1979, after the draft finalized by theElectrical Insulators and Accessories Sectional Committee had beenapproved by the Electrotechnical Division Council.0.2 This standard has been prepared with a view to achieve thefollowing objects:a) to define the terms used,b) to define the electrical and mechanical characteristics of postinsulators of organic material and to prescribe the conditionsunder which the specified values shall be verified,c) to define methods of tests, andd) to prescribe acceptance criteria. NOTE 2 This standard does not give numerical values for insulator charac-teristics, neither does it deal with the choice of post insulators for specificoperating conditions.IS : 2544-1973* and IS : 5350 (Part I )-1970t specifynumerical values for electrical and mechanical characteristics and give thedimensions necessary for interchangeability of post insulators 0.3 The present standard applies to post insulators of cast epoxy resin forwhich a long experience is available.Provisionally, it may also be usedas a guide for the minimum test requirements on post insulators of otherorganic materials. When enough experience is gained in those otherorganic materials, it will be possible, if necessary, to modify the presentstandard.*Specification for porcelain post insulators for systems with nominal voltages greaterthan 1 000 volts (Jirst revision ).+Dimensions of indoor and outdoor porcelain post insulators and post insulatorunits for system with nominal voltages greater than 1000 V: Part I Indoor postinsulators. 3
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