IEC_60079-20.1996.pdf

|PUBLISHED DOCUMENTPD IEC60079-20:2000IEC60079-20:1996ICS 29.260.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWElectrical apparatus forexplosive gasatmospheres Part 20:Data for flammable gases andvapours,relating to the use of electricalapparatusThis Published Document,havingbeen prepared under thedirection of the ElectrotechnicalSector Committee,was publishedunder the authority of theStandards Committee and comesinto effect on 15 April 2000 BSI 04-2000ISBN 0 580 34240 9PD IEC 60079-20:2000Amendments issued since publicationAmd.No.DateCommentsNational forewordThis Published Document reproduces verbatim IEC 60079-20:1996.The UK participation in its preparation was entrusted to Technical CommitteeGEL/31,Electrical apparatus for use in explosive atmospheres,which has theresponsibility to:aid enquirers to understand the text;present to the responsible international/European committee any enquirieson the interpretation,or proposals for change,and keep the UK interestsinformed;monitor related international and European developments and promulgatethem in the UK.A list of organizations represented on this committee can be obtained on request toits secretary.From 1 January 1997,all IEC publications have the number 60000 added to the oldnumber.For instance,IEC 27-1 has been renumbered as IEC 60027-1.For a periodof time during the change over from one numbering system to the other,publications may contain identifiers from both systems.Cross-referencesThe British Standards which implement international or European publicationsreferred to in this document may be found in the BSI Standards Catalogue under thesection entitled International Standards Correspondence Index,or by using theFind facility of the BSI Standards Electronic Catalogue.A British Standard does not purport to include all the necessary provisions of acontract.Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunityfrom legal obligations.Summary of pagesThis document comprises a front cover,an inside front cover,the IEC title page,pages 2 to 37 and a back cover.The BSI copyright notice displayed in this document indicates when the documentwas last issued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