IS/IEC 60079 : PART 20 : SEC 1 : 2010 : Explosive Atmospheres Part 20 Material Characteristics For Gas and Vapour Classification Section 1 Test Methods and Data

NATIONAL FOREWORD

This Indian Standard (Part 20/Sec 1) which is identical with IEC 60079-20-1 : 2010 ‘Explosive atmospheres — Part 20-1: Material characteristics for gas and vapour classification — Test methods and data’ issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the Electrical Apparatus for Explosive Atmospheres Sectional Committee and approval of the Electrotechnical Division Council.

This standard supersedes the following Indian Standards:

IS 7820 : 2004/IEC 60079-4 : 1975 Electrical apparatus for explosive gas atmospheres — Method of test for ignition temperatures (first revision)

IS 9570 : 1980(Assistance drawn from IEC 60079-12 : 1978) Classification of flammable gases or vapours with air according to their maximum experimental safe gaps and minimum igniting currents

IS 9735 : 2003/IEC 60079-1-1 : 2002 Electrical apparatus for explosive gas atmospheres — Flameproof enclosures “d” Method of test for ascertainment of maximum experimental safe gap (first revision)

IS/IEC 60079 (Part 20) : 1996 Electrical apparatus for explosive gas atmospheres: Part 20 Data for flammable gases and vapours relating to the use of electrical apparatus

The text of IEC Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.