This part of IEC 60079 is applicable to electrical equipment protected by enclosure and
surface temperature limitation for use in explosive dust atmospheres. It specifies
requirements for design, construction and testing of electrical equipment.
This standard supplements and modifies the general requirements of IEC 60079-0. Where a
requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of
this standard shall take precedence.
This standard does not apply to dusts of explosives, which do not require atmospheric oxygen
for combustion, or to pyrophoric substances.
This standard does not apply to electrical equipment intended for use in underground parts of
mines as well as those parts of surface installations of such mines endangered by firedamp
and/or combustible dust.
This standard does not take account of any risk due to an emission of flammable or toxic gas
from the dust.
NOTE 1 The application of electrical equipment in atmospheres, which may contain combustible dust as well as
explosive gas, whether simultaneously or separately, may require additional protective measures.
NOTE 2 Where the equipment has to meet other environmental conditions, for example, protection against
ingress of water and resistance to corrosion, additional methods of protection may be necessary. The method used
should not adversely affect the integrity of the enclosure.
IEC 60079-31:2008 history
2023IEC 60079-31:2022/COR1:2023 Corrigendum 1 - Explosive atmospheres - Part 31: Equipment dust ignition protection by enclosure "t"
1970IEC 60079-31:2013/ISH1:2022 Interpretation Sheet 1 - Explosive atmospheres - Part 31: Equipment dust ignition protection by enclosure "t"
0000 IEC 60079-31:2022 RLV
2013IEC 60079-31:2013 Explosive atmospheres - Part 31: Equipment dust ignition protection by enclosure "t"
1970IEC 60079-31:2008/COR1:2009 Corrigendum 1 - Explosive atmospheres - Part 31: Equipment dust ignition protection by enclosure "t"
2008IEC 60079-31:2008 Explosive atmospheres - Part 31: Equipment dust ignition protection by enclosure "t"