Full Description

This is the common ANCE, CSA, and UL standard for Switchboards.It is the Second edition of NMX-J-118/2-ANCE, the First edition of C22.2 No. 244, and the Eleventh edition of UL 891.

1.1 Scope and object

1.1.1This 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.

1.1.2In this standard the term switchboard is intended to refer to a dead-front switchboard.

1.1.3These 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.

1.1.4These requirements cover switchboards for use on circuits having available rms symmetrical short-circuit currents of not more than 200 000 A.