UL 891

Edition Number:12SCC Approved:--
Edition Date:2019-07-19DOD Approved: --
Price Code:CANSI Approved: 2019-07-19


    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.

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    • Cover
    • Transmittal
    • UL Harmonized Standard Title Page
    • Table of Contents
      • Switchboards
        • 1 General
          • 1.1 Scope and object
        • 2 General
          • 2.1 Undated references
          • 2.2 Multiple countries codes
          • 2.3 Products for Canada
          • 2.4 Components