BS 5501-4 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
Additional Comments: W/D S/S BY BS EN 50017
Published By:British Standards Institution (BSI)
Apparatus of rated voltage 6600 V or less with no moving parts in direct contact with the filling material. Supplements Part 1.