BS 1259 58th Edition, February 24, 1958
Intrinsically Safe Electrical Apparatus and Circuits - For Use in Explosive Atmospheres
Includes all amendments and changes through Amendment 4, March 1981
Additional Comments: W/D S/S BY BS EN 50020
Published By:British Standards Institution (BSI)
Defines 'intrinsically safe'. Dangerous industrial gases and vapours, for which certificates of intrinsic safety may be obtained, are listed and classified. Principles of and tests for intrinsic safety appended. (See also BS 5501-7, identical to EN 50020, referred to in EEC Directives, and BS 5501-9, identical to EN 50039).