BS 5501-9 82nd Edition, March 31, 1982
Electrical Apparatus for Potentially Explosive Atmospheres Part 9: Specification for Intrinsically Safe Electrical Systems 'i'
Includes all amendments and changes through Amendment 1, March 1990
Additional Comments: S/S BY BS EN 60079-25
Published By:British Standards Institution (BSI)
Specific requirements for construction and testing of intrinsically safe systems intended for use, as a whole or in part, in potentially explosive atmospheres. Supplements Part 7.