This part of IEC 60079 describes a test method intended for the measurement of the maximum experimental safe gaps for gas- or vapour-air mixtures under normal conditions of temperature1 and pressure so as to permit the selection of an appropriate group of flameproof enclosures.The method does not take into account the possible effects of obstacles on the safe gaps2 .1 An exception if made for substances with vapour pressures which are too low to permit mixtures of the required concentrations to be prepared at normal ambient temperatures. For these substances@ a temperature 5 ??above that needed to give the necessary vapour pressure is used. 2 The design of the test apparatus for safe gap determination@ other than that used for selecting the appropriate group of enclosure for a particular gas@ may need to be different to the one described in this standard. For example@ the volume of the enclosure@ flange width@ gas concentrations and the distance between the flanges and any external wall or obstruction may have to be varied. As the design depends on the particular investigation which is to be undertaken@ it is unpracticable to recommend specific design requirements@ but for most applications the general principles and precautions indicated in the clauses of this standard will still apply.
IEC 60079-1:2007/COR1:2008 history
2020IEC 60079-1:2014/ISH1:2020 Interpretation sheet 1 - Explosive atmospheres - Part 1: Equipment protection by flameproof enclosures "d"
2018IEC 60079-1:2014/COR1:2018 Explosive atmospheres - Part 1: Equipment protection by flameproof enclosures "d"; Corrigendum 1
0000 IEC 60079-1:2014 RLV
2008IEC 60079-1:2007/COR1:2008 Explosive atmospheres - Part 1: Equipment protection by flameproof encloures "d"
2007IEC 60079-1:2003/ISH1:2007 Interpretation sheet 1 - Electrical apparatus for explosive gas atmospheres - Part 1: Flameproof enclosures "d"
2007IEC 60079-1:2007 Explosive atmospheres - Part 1: Equipment protection by flameproof encloures "d"
2003IEC 60079-1:2003 Electrical apparatus for explosive gas atmospheres - Part 1: Flameproof enclosures "d"
1970IEC 60079-1:2001/COR1:2001 Corrigendum 1 - Electrical apparatus for explosive gas atmospheres - Part 1: Flameproof enclosures "d"
2001IEC 60079-1:2001 "Electrical Apparatus for Explosive Gas Atmospheres - Part 1: Flameproof Enclosures ""D"" (Edition 4.0)"
1970IEC 60079-1:1990/AMD2:1998 Amendment 2 - Electrical apparatus for explosive gas atmospheres - Part 1: Construction and verification test of flameproof enclosures of electrical apparatus
1998IEC 60079-1:1998 Electrical apparatus for explosive gas atmospheres - Part 1: Construction and verification test of flameproof enclosures of electrical apparatus
1970IEC 60079-1:1990/AMD1:1993 Amendment 1 - Electrical apparatus for explosive gas atmospheres - Part 1: Construction and verification test of flameproof enclosures of electrical apparatus
1990IEC 60079-1:1990 Electrical apparatus for explosive gas atmospheres; part 1: construction and verification test of flameproof enclosures of electrical apparatus
1982IEC 60079-1:1982 Electrical Apparatus for Explosive Gas Atmospheres Part 1: Construction and Verification Test of Flameproof Enclosures of Electrical Apparatus (Edition 2.0)
1970IEC 60079-1:1971/AMD1:1979 Amendment 1 - Electrical apparatus for explosive gas atmospheres - Part 1: Construction and test of flameproof enclosures of electrical apparatus
1971IEC 60079-1:1971 Materiel electrique pour atmospheres explosives Premiere partie: Construction@ Verification et essals des enveloppes antideflagrantes de materiel electrique (Edition 2.0)