UL 891
Switchboards

DETAILS
Edition Number:11SCC Approved:--
Edition Date:2005-07-26DOD Approved: --
Price Code:CANSI Approved: 2012-10-31
Type:ulcsance

  • SCOPE

    1.1 Scope and object

    1.1.1 This Standard applies to switchboards nominally rated at 600 V or less and intended for use in accordance with the Canadian Electrical Code, Part 1 (CE Code, Part 1), 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 rms symmetrical short-circuit currents of not more than 200 000 A.

  • TABLE OF CONTENTS
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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
        • 3 Definitions
        • 4 Units of measurement
        • 5 Electrical characteristics of assemblies
          • 5.1 General
          • 5.2 Rated voltages
          • 5.3 Continuous current rating
          • 5.4 Short-circuit current rating
          • 5.5 Rated peak withstand current (I) (of a circuit of an assembly)
          • 5.6 Rated conditional short-circuit current (I) (of a circuit of an assembly)
          • 5.7 Rated fused short-circuit current (I) (of a circuit of an assembly)
          • 5.8 Rated diversity factor
          • 5.9 Rated frequency
        • 6 Information to be given regarding the assembly
          • 6.1 Nameplates
          • 6.2 Markings
          • 6.3 Instructions for installation, operation and maintenance
        • 7 Service conditions
          • 7.1 Normal service conditions
          • 7.2 Special service conditions
          • 7.3 Conditions during transport, storage, and erection
        • 8 Design and construction
          • 8.1 Mechanical design
          • 8.2 Enclosure and degree of protection
          • 8.3 Temperature rise
          • 8.4 Protection against electric shock
          • 8.5 Short-circuit protection and short-circuit withstand strength
          • 8.6 Switching devices and components installed in assemblies
          • 8.7 Internal separation of assemblies by barriers or partitions
          • 8.8 Electrical connections inside an assembly: bars and insulated conductors
          • 8.9 Requirements for electronic equipment supply circuits
          • 8.10 Electromagnetic compatibility
        • 9 Test specifications
          • 9.1 Classification of tests
          • 9.2 Type tests
          • 9.3 Routine tests
        • 10 Tables
        • 11 Figures
    • Annex A – Standards for Components
    • Annex B – Standards Referenced in the Trinational Switchboard Standard
    • Annex C – Markings Required to be Translated and Suggested French Translations
    • Annex D – Example of Series Short-Circuit Current Rating Marking
    • Annex E – Example of Terminal Torque Marking(Informative)
    • Annex F – Short-Circuit Test at Reduced Voltage(normative)
    • Annex G – Maximum 100 000 Ampere Short-Circuit Current Rating Without Short-Circuit Test(normative)
    • Supplement A – Use of Components Not UL Listed or Recognized