Description

BS 764 – Specification for automatic change-over contactors for emergency lighting systems

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.

Cross References:
BS 2752
BS 2757
BS 5750