Historical
IEC 61241-4 Ed. 1.0 b:2001
Electrical apparatus for use in the presence of combustible dust - Part 4: Type of protection "pD"
Gives requirements on the design, construction, testing and marking of electrical apparatus for use in combustible dust atmospheres in which a protective gas (air or inert gas), maintained at a pressure above that of the external atmosphere, is used to prevent the entry of dust which might otherwise lead to the formation of a combustible mixture within enclosures which do not contain a source of combustible dust.
CONTENT PROVIDER
International Electrotechnical Commission [iec]
International Electrotechnical Commission [iec]