Explosive Atmospheres - Part 31: Equipment Dust Ignition Protection by Enclosure "t"
UL 60079-31
1 Scope

1DV.1 Modification of Clause 1, first and second paragraphs to replace with the following:
1DV.1.1 This part of IEC 60079 standard 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 and Ex Components.This standard supplements and modifies the general requirements of UL IEC 60079-0. Where a requirement of this standard conflicts with a requirement of UL IEC 60079-0, the requirement of this standard takes 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 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 standard does not take account of any risk due to an emission of flammable or toxic gas from the dust.

Consideration of additional protective measures is required where the application of electrical equipment is in atmospheres, which can contain combustible dust as well as explosive gas, whether simultaneously or separately.

Where the electrical equipment has to meet other environmental conditions, for example, protection against ingress of water and resistance to corrosion, additional measures can be necessary. The measures used should not adversely affect the integrity of the enclosure.

1DV.2 Addition of 1DV.2.1
1DV.2.1 Where references are made to other IEC 60079 standards, the referenced requirements found in these standards apply as modified by any applicable U.S. National Differences.