Scope and object 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. In this standard the term switchboard is intended to refer to a dead-front switchboard. 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. 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.
891-2019由UL - UL 发布于 2019-07-19,并于 2019-07-25 实施。
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