CSA C22.2 NO. 244:19 (R2024)

Preface This is the harmonized ANCE, CSA Group, and ULSE standard for Switchboards . It is the Fourth edition of NMX-J-118/2-ANCE, the Second edition of CSA-C22.2 No. 244, and the Twelfth edition of UL 891. This edition of NMX-J-118/2-ANCE supersedes the previous edition published on October 31, 2012. This edition of CSA-C22.2 No. 244 supersedes the previous edition published on July 26, 2005. This edition of UL 891 supersedes the previous edition published on July 26, 2005. This harmonized standard has been jointly revised on March 21, 2025. For this purpose, CSA Group and ULSE are issuing revision pages dated March 21, 2025, and ANCE is issuing a new edition dated March 21, 2025. This harmonized standard was prepared by the Association of Standardization and Certification, (ANCE), CSA Group and ULSE. The efforts and support of the Technical Harmonization Subcommittee, 17D –Panelboard and Switchboard on the Harmonization of Electrotechnical Standards of the Nations of the Americas (CANENA), are gratefully acknowledged. This standard is considered suitable for use for conformity assessment within the stated scope of the standard. The present Mexican standard was developed by the CT CDI Control y Distribucion Industrial from the Comite de Normalizacion de la Asociacion de Normalizacion y Certificacion, A.C., CONANCE, with the collaboration of the switchboard manufacturers and users. This standard was reviewed by CSA C232(ICSP) – Integrated Committee on Switchgear Products, under the jurisdiction of the CSA Technical Committee on Industrial Products and the CSA Strategic Steering Committee on requirements for Electrical Safety, and has been formally approved by the CSA Technical Committee. This standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. Scope 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.