UL 857

UL Standard for Safety Busways

active, Most Current
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Organization: UL
Publication Date: 25 March 2009
Status: active
Page Count: 115
scope:

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).

Document History

UL 857
March 25, 2009
UL Standard for Safety Busways
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...
March 25, 2009
UL Standard for Safety Busways
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...
March 25, 2009
UL Standard for Safety Busways
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...
January 15, 2001
UL Standard for Safety Busways
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...
857
January 15, 2001
UL Standard for Safety Busways
A description is not available for this item.
857
October 28, 1994
UL Standard for Safety Busways and Associated Fittings
A description is not available for this item.
857
October 28, 1994
UL Standard for Safety Busways and Associated Fittings
A description is not available for this item.
857
October 28, 1994
UL Standard for Safety Busways and Associated Fittings
A description is not available for this item.
857
October 28, 1994
UL Standard for Safety Busways and Associated Fittings
A description is not available for this item.

References

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