UL 891


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.


  • Edition Number: 11
  • Edition Date: 07/26/2005
  • Price Code: C
  • Type: ulcsance
  • ANSI Approved: 10/31/2012
  • DOD Approved: