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EXPLOSIVE ATMOSPHERES –

Part 31 : Equipment dust ignition protection by enclosure "t"

1 Scope

This part of IEC 60079 is applicable to equipment protected by enclosure and surface

temperature limitation for use in explosive dust atmospheres. It specifies requirements for

design, construction and testing of Ex Equipment and Ex Components.

This document supplements and modifies the general requirements of IEC 60079-0. Where a

requirement of this document conflicts with a requirement of IEC 60079-0, the requirement of

this document takes precedence.

This document does not apply to dusts of explosives, which do not require atmospheric oxygen

for combustion, or to pyrophoric substances.

This document does not apply to Ex Equipment or Ex Components 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 document does not take account of any hazard due to an emission of flammable or toxic

gas from the dust.

This document does not contain requirements for Ex Equipment used in areas where both

combustible dust and explosive gas atmospheres can occur, whether simultaneously or

separately. Requirements for explosive gas atmospheres can be found in other parts of the

IEC 60079 series. Guidance on Ex Equipment to be used where combustible dust and explosive

gas atmospheres occur simultaneously ("hybrid mixtures") can be found in IEC 60079-1 4.

Where the Ex Equipment has to meet other environmental conditions, for example, protection

against ingress of water and resistance to corrosion, additional measures which do not

adversely affect the integrity of the enclosure can be necessary.