Specification for automatic change-over contactors for emergency lighting systems.
STANDARD published on 31.5.1990
Designation standards: BS 764:1990
Publication date standards: 31.5.1990
The number of pages: 14
Approximate weight : 42 g (0.09 lbs)
Country: British technical standard
Category: Technical standards BS
Design and performance requirements for d.c. and single-phase a.c. double-pole change-over contactors for low-voltages up to 250 volts and a range of standard current ratings, which are used to provide the automatic transfer of current supplied to safety lights from the normal source to an alternative source when the normal source fails; reconnection is automatic when the normal supply conditions are restored. Status: Confirmed