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BS 764

90th Edition, May 31, 1990

Complete Document

Specification for Automatic Change-Over Contactors for Emergency Lighting Systems

Includes all amendments and changes through Reaffirmation Notice , December 1, 2012

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Product Details:

  • Revision: 90th Edition, May 31, 1990
  • Published Date: December 1, 2012
  • Status: Active, Most Current
  • Document Language: English
  • Published By: British Standards Institution (BSI)
  • Page Count: 14
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

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.