Specifies the performance of switches for industrial use. Applies to up to 1000 bar for non-flammable, non-corrosive, non-toxic fluids and atmospheres. Does not apply to pressure difference switches, pressure indicating devices or switches with non-electrical outputs.Cross References:BS 21BS 2011:Part 2.1BS 2011:Part 2.1ABS 2011:Part 2.1BBS 2011:Part 2.1FcBS 2779BS 4568:Part 2BS 4683BS 4794:Part 1BS 4941:Part 1BS 5420BS 5424:Part 1BS 5501