Electrical apparatus for use in the presence of combustible dust - Part 18: Protection by encapsulation "mD"
|Publication Date:||19 November 2004|
|ICS Code (Electrical apparatus for explosive atmospheres):||29.260.20|
This standard is to be read in conjunction with IEC 61241-0, the requirements of which apply to electrical apparatus protected by encapsulation and surface temperature limitation unless specifically excluded. This part of IEC 61241 is applicable to electrical apparatus protected by encapsulation type of protection mD and surface temperature limitation for use in areas where combustible dust may be present in quantities which could lead to a fire or explosion hazard. It specifies requirements for design, construction and testing of electrical apparatus, parts of electrical apparatus and Ex components where the rated voltage does not exceed 10kV. The application of electrical apparatus in atmospheres which may contain explosive gas as well as combustible dust, whether simultaneously or separately, requires 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 is not applicable to electrical apparatus 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. This standard does not include other types of protection and is only applicable to protection by encapsulation.