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  • DS/EN 60079-20-1:2010

DS/EN 60079-20-1:2010 (Valid to: 30-04-2022)

Explosive atmospheres - Part 20-1: Material characteristics for gas and vapour classification - Test methods and data

Valid to: 30-04-2022
Price from:
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Harmonized under:
  • Directive 2014/34/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres (recast) Text with EEA relevance

Harmonized standards:


IEC 60079-20-1:2010 provides guidance on classification of gases and vapours. It describes a test method intended for the measurement of the maximum experimental safe gaps (MESG) for gas- or vapour-air mixtures under normal conditions of temperature and pressure so as to permit the selection of an appropriate group of equipment. The tabulated values of chemical and engineering properties of substances are provided to assist engineers in their selection of equipment to be used in hazardous areas. This first edition of IEC 60079-20-1 cancels and replaces the first edition of IEC 60079-1-1(2002), the second edition of IEC 60079-4 (1975), its amendment 1(1995) and its complement: IEC 60079-4A (1970), the first edition of IEC/TR 60079-12 (1978) and the first edition of IEC 60079-20 (1996). It constitutes a technical revision.

Number of pages: 88

Published: 2010-05-07

Date of approval: 2010-03-22

ICS: 29.260.20 - Electrical apparatus for explosive atmospheres

Item number: M233887

*Expected revoked date: 30-04-2022



  • CLC/TC 31
  • IEC/TC 31

Danish committee