UL 857-2025【PDF原文+中文翻译版】 UL母线槽安全标准 UL Standard for Safety Busways

UL 857-2025【PDF原文+中文翻译版】

UL Standard for Safety Busways

 UL母线槽安全标准

standard by Underwriters Laboratories, 09/10/2025.

LANGUAGES: English+Chinese【英文原文+中文翻译】

Historical Editions: UL 857 (2009), UL 857 (2009), UL 857 (2009), UL 857 (2009), UL 857 (2001)

Description

This Standard applies to service-entrance, feeder, and branch-circuit busways and associated fittings rated at 1000 V or less, 6000 A or less, and intended for use in accordance with the Canadian Electrical Code, Part I (CE Code, Part I), NFPA 70®, National Electrical Code® (NEC®), and the Mexican Standard for Electrical Installations (Utility), NOM-001-SEDE. 

These requirements do not apply to metal enclosed bus intended for connecting switchgear assemblies for use in prefabricated electric distribution systems.

NFPA 70®, National Electrical Code®, and NEC® are registered trademarks of the National Fire Protection Association, Quincy, MA.

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.

Requirements stated throughout this Standard for fittings apply to tap boxes, feed boxes, plug-in devices, and similar fittings, but do not apply to busway elbows, tees, and crosses.

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