BS 764 is a British Standard which specifies d.c. and single-phase a.c. automatic double-pole change-over contactors for low voltages up to 250 V employed in conjunction with storage batteries or other alternative source of supply.
BS 764 specifies means for automatically changing the current supplied to safety lights from the normal source to the alternative source when the normal source fails, and of reconnecting the safety lights to the normal source when this source is restored.
BS 764 on contactors for emergency lighting systems is helpful for:
Having access to reliable guidelines is essential to prepare and use quality contactors for emergency lighting systems. BS 764 provides manufacturers with the characteristics, requirements for design, construction and marking along with test requirements and methods for measurement of temperature, which allows them to effectively manufacture and test contactors for emergency lighting systems.
BS 764 provides users with efficient, reliable and standardized contactors for emergency lighting systems.