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  • BSI
    BS 764:1990 Specification for automatic change-over contactors for emergency lighting systems
    Edition: 1990
    $281.30
    / user per year

Description of BS 764:1990 1990

This British Standard 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, to provide a means of 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.

This standard does not apply to three-phase a.c. automatic change-over contactors.

NOTE 1 Appendix B lists information to be supplied to the manufacturer with the enquiry and/or order.

NOTE 2 The titles of the publications referred to in this standard are listed on the inside back cover.



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.

Standard NumberBS 764:1990
TitleSpecification for automatic change-over contactors for emergency lighting systems
StatusConfirmed
Publication Date1990-05-31
ReplacesBS 764:1954
DescriptorsEmergency lighting, Breaking capacity, Direct current, Performance, Making capacity, Switchgear, Marking, Electrical testing, Force, Instructions for use, Temperature-rise limit, Relays, Temperature measurement, Switches, Lighting systems, Low-voltage equipment, Type testing, High-voltage tests, Electric contacts, Rated current, Contactors, Single-phase current
ICS29.120.40 Switches
CommitteePEL/121/1
ISBN0 580 17995 8
PublisherBSI
Pages14

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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