UL Standard for Safety Electrical Apparatus for Explosive Gas Atmospheres – Part 18: Construction, Test and Marking of Type of Protection Encapsulation "m" Electrical Apparatus
|Publication Date:||15 August 2005|
This standard gives the specific requirements for the construction, testing and marking of electrical apparatus, parts of electrical apparatus and Ex components with the type of protection encapsulation "m".
This standard only applies for encapsulated electrical apparatus, encapsulated parts of electrical apparatus and encapsulated Ex components (hereinafter always referred to as "m" apparatus) where the rated voltage does not exceed 10 kV with a relative tolerance of +10 %.
This standard supplements the general requirements in UL 60079-0.
The U.S. version of IEC 60079-18 does not include requirements for Group I electrical apparatus.
Where references are made to other IEC standards, the referenced requirements found in these standards shall apply as modified by any applicable U.S. National Differences.