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About This Item


Full Description


This is the first edition of CAN/CSA-C22.2 No. 60079-18, Explosive atmospheres - Part 18: Equipment protection by encapsulation "m", which is an adoption, with Canadian deviations, of the identically titled IEC (International Electrotechnical Commission) Standard 60079-18 (third edition, 2009-05). It replaces the previous edition published in 1995 as CAN/CSA-E79-18, Electrical apparatus for explosive gas atmospheres - Part 18: Encapsulation "m" (adopted CEI/IEC 79-18:1992). It is one in a series of Standards issued by CSA under Part II of the Canadian Electrical Code.

It should be noted that the third edition of IEC 60079-18 supersedes and replaces both IEC 60079-18:2004, Electrical apparatus for explosive gas atmospheres - Part 18: Construction, test and marking of type of protection encapsulation "m" electrical apparatus, and IEC 61241-18:2004, Electrical apparatus for use in the presence of combustible dust - Part 18: Protection by encapsulation "mD".


This part of IEC 60079 gives the specific requirements for the construction, testing and marking of electrical equipment, parts of electrical equipment and Ex components with the type of protection encapsulation "m" intended for use in explosive gas atmospheres or explosive dust atmospheres.

This part applies only for encapsulated electrical equipment, encapsulated parts of electrical equipment and encapsulated Ex components (hereinafter always referred to as "m" equipment) where the rated voltage does not exceed 11 kV.

The application of electrical equipment in atmospheres, which may contain explosive gas as well as combustible dust simultaneously may require additional protective measures.

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 take account of any risk due to an emission of flammable or toxic gas from the dust.

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.

Document History

  1. CAN/CSA C22.2 No. 60079-18:16 (R2021)

    Explosive atmospheres - Part 18: Equipment protection by encapsulation "m" (Adopted IEC 60079-18:2014, with Canadian deviations)

    • Most Recent
  2. CAN/CSA C22.2 NO. 60079-18:12


    Explosive atmospheres - Part 18: Equipment protection by encapsulation "m" (Adopted IEC 60079-18:2009, third edition, 2009-05, with Canadian deviations)

    • Historical Version