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UL 857

13th Edition, August 23, 2016

Complete Document

UL Standard for Safety Busways

Includes all amendments and changes through Revision Page(s) , August 23, 2016


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Active, Most Current

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Additional Comments:
SAME AS CSA C22.2 NO 27
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Product Details:

  • Revision: 13th Edition, August 23, 2016
  • Published Date: August 23, 2016
  • Status: Active, Most Current
  • Document Language: English
  • Published By: UL (UL)
  • Page Count: 115
  • ANSI Approved: Yes
  • DoD Adopted: Yes

Description / Abstract:

Scope and object 

This Standard applies to service-entrance, feeder, and branch-circuit busways and associated fittings rated at 600 V or less, 6 000 A or less, and intended for use in accordance with the Canadian Electrical Code, Part I (CE Code, Part I), the National Electrical Code (NEC), NFPA 70, and the Mexican Standard for Electrical Installations (Utility), NOM-001-SEDE, (see Annex B, Reference Item No. 1). These requirements do not apply to metal enclosed bus intended for connecting switchgear assemblies for use in prefabricated electric distribution systems. 

For the purpose of these requirements, a busway is considered to be a grounded metal enclosure containing factory mounted conductors that are usually copper or aluminum bars, rods, or tubes. 

Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 

Unless otherwise indicated, all voltage and current values mentioned in this Standard are root-mean-square (rms).