UL 60079-26:2017-07 Explosive Atmospheres一Part 26: Equipment with Equipment Protection Level (EPL) Ga.
1 DV DR Modification of Clause 1 to replace with the following:
This part of IEC 60079 standard specifies alternative requirements for construction, test and marking for electrical equipment that provides Equipment Protection Level (EPL) Ga when single standardised Types of Protection (e.g. Ex “Ia” , Ex “ma”, Ex “da”) cannot be applied. This standard also applies to equipment mounted across a boundary where different Equipment Protection Levels may be required.
EXAMPLE: Equipment installed in the wall of a storage vessel containing Zone 0 (requiring EPL Ga) inside an area defined as Zone 1 (requiring EPL Gb).
This electrical equipment-within-the operationaFparameters specified by-the manufacturer ensures a -very–high tevel–oL Protection that -includes rare malfunctions related -to- the olu.1.,.D :t: ,Jf
NOTE A malfunction
may result from a
failure of the component parts of the electrical
equipment or from
anticipated externally
applied Influences.
independent malfunctions which
may occur
more frequently and
which, separately, would not create an Ignition
hazard but which, in combination,
could create a potential Ignition
hazard, are regarded as occurring together to form a rare malfunction.
This standard supplements and modifies the general requirements of IEC 60079-0 jJj
60079-0. Where a requirement of this standard conflicts with a requirement of lEG 60079-0
UL 60079-0. the requirement of this standard takes precedence.
Where references are made to IEC 60079 standards. the referenced requirements found in these standards shall apply as modified by any applicable U.S. National Differences.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
2DV DR Modification of Clause 2 references to replace with the following:
ANSI/IEC 60529. Degrees of protection provided by enclosure (IP Code)
IEC—6007-9-01 Explosive atmospheres — Part 0: Equipment — General requirements
IEC 60079-1, Explosive atmospheres — Part 1: Equipment protection by flameproof enclosures
lEG 60079-11, Explosive atmospheres — Part 11: Equipment protection by intrinsic safety “1”
IEC 60695-11-10, Fire hazard testing — Part 11-10: Test flames — 50 W horizontal and vertical flame test methods.UL 60079-26 pdf download.