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 p
SANS 61241-4:2001 history
2001SANS 61241-4:2001 Electrical apparatus for use in the presence of combustible dust Part 4: Type of protection "pD"