BS 4794-2.20 82nd Edition, March 31, 1982
Control Switches (Switching Devices, Including Contactor Relays, for Control and Auxiliary Circuits for Voltages up to and Including 1000 V a.c. and 1200 V d.c. Part 2: Special Requirements for Specific Types of Control Switches Section 2.20: Position Switches with Positive Opening Operation
Includes all amendments and changes through Reaffirmation Notice , 1990
Additional Comments: W/D S/S BY EN 60947-5-1
Published By:British Standards Institution (BSI)
Additional specific requirements for position switches with positive opening operation, used in the safeguarding of machinery.