Standard for Switchboards
1.1 Scope and object
1.1.1 This Standard applies to switchboards nominally rated at 1 000 V or less and intended for use in accordance with the Canadian Electrical Code, Part I (CE Code, Part I), the National Electrical Code (NEC), ANSI/NFPA 70, and the Mexican Standard for Electrical Installations (Utility), NOM-001-SEDE.
1.1.2 In this standard the term switchboard is intended to refer to a dead-front switchboard.
1.1.3 These requirements do not cover the following switchboard types: preset and dimmer control (theater), live front, railway control or electrification; or constructions intended only for receiving motor control center units.
1.1.4 These requirements cover switchboards for use on circuits having available short-circuit currents of not more than 200 000 A.
1.1.5 These requirements do not cover switchboards with short-time current ratings.
| UL Standards & Engagement | |
|---|---|
| Product Category | Standards and Technical Documents |
| Product Number | UL 891 |
| Product Name | Standard for Switchboards |
