BS 5501-7 77th Edition, December 30, 1977
Electrical Apparatus for Potentially Explosive Atmospheres Part 7: Intrinsic Safety 'i'
Includes all amendments and changes through Amendment 17, March 15, 1994
Additional Comments: W/D S/S BY BS EN 50020
Published By:British Standards Institution (BSI)
Intrinsically safe electrical apparatus in which the electrical circuits themselves are incapable of causing ignition of a surrounding explosive atmosphere. Supplements and modifies Part 1