77th Edition, December 30, 1977
Electrical Apparatus for Potentially Explosive Atmospheres Part 4: Powder Filling 'q'
Includes all amendments and changes through Amendment 2, March 1990
Superseded By: BS EN 50017
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Description / Abstract:
Apparatus of rated voltage 6600 V or less with no moving parts in direct contact with the filling material. Supplements Part 1.