GB 12476.6-2010 Electrical apparatus for use in the presence of combustible dust—Part 6:Protection by encapsulation "mD"

Scope

This part should be used in conjunction with the general requirements of GB 12476, which apply to electrical equipment protected by encapsulation and limited surface temperature, unless otherwise specified.
This part applies to electrical equipment protected by encapsulation type "mD" and limited surface temperature in flammable dust environments. In such environments, the presence of flammable dust in sufficient quantities can lead to fire or explosion hazards. This part specifies the design, structure, and testing requirements for electrical equipment, electrical equipment components, and Ex components with a rated voltage not exceeding 10kV.
Note 1: The actual working voltage may exceed the above-mentioned value by up to 10%.
Note 2: GB 12476.2 "Electrical Equipment for Flammable Dust Environments - Part 2: Selection and Installation" provides guidelines for the selection and installation of electrical equipment. Electrical equipment specified in this part may also comply with other standards, such as the supplementary requirements of GB 3836.1 "Explosive Environments - Part 1: General Requirements for Equipment".
For electrical equipment used in environments where flammable gases and flammable dust may occur simultaneously or separately, additional protective measures are required.
This part does not apply to pyrotechnic dust or self-igniting substances that do not require oxygen in the atmosphere to burn.
This part does not apply to electrical equipment used in underground coal mines and surface coal mine installations where gas and/or flammable coal dust pose hazards.
This part does not consider the hazards caused by flammable or toxic gases emitted from dust.
This part does not include other explosion-proof types, and is only applicable to encapsulation type equipment.

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