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BSI BS 764:1990

Specification for automatic change-over contactors for emergency lighting systems
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BSI BS 764:1990

Specification for automatic change-over contactors for emergency lighting systems

PUBLISH DATE 1990
PAGES 12
BSI BS 764:1990

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.
SDO BSI: British Standards Institution
Document Number 764
Publication Date May 31, 1990
Language en - English
Page Count 12
Revision Level
Supercedes
Committee PEL/121/1
Publish Date Document Id Type View
May 31, 1990 BS 764:1990 Revision
June 12, 1974 BS 764:1954 Revision
Dec. 13, 1937 BS 764:1937 Revision