Preface This is the harmonized ANCE, CSA Group, and UL standard for medium-voltage ac contactors, controllers, and control centres. It is the third edition of NMX-J-564/106-ANCE, the third edition of CSA C22.2 No. 253:20, and the seventh edition of UL 347. This edition of NMX-J-564/106-ANCE supersedes the previous edition published on January 2016. This edition of CSA C22.2 No. 253 supersedes the previous edition published on January 2016. This edition of UL 347 supersedes the previous edition published on January 29, 2016. This harmonized standard has been jointly revised on September 30, 2022. For this purpose, CSA Group and UL are issuing revision pages dated September 30, 2022, and ANCE is issuing a new edition dated September 30, 2022. This harmonized Standard was prepared by the Association of Standardization and Certification, CSA Group and Underwriters Laboratories Inc. The efforts and support of the medium-voltage control manufacturing industry and the CANENA Technical Harmonization Subcommittee THSC TC17 WG1 – Medium Voltage Controllers, which includes representatives of UL, CSA Group, ANCE, and North American medium voltage control manufacturers, 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 GTD – Generación, Transmisión y Distribución from the Comité de Normalización de la Asociación de Normalización y Certificación, A.C., CONANCE, with the collaboration of the medium-voltage controller manufacturers and users. This Standard was reviewed by the CSA Integrated Committee on Industrial Control, 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 is applicable to ac contactors applied at voltages in the range of 1 501V to 15kV, and metal-enclosed contactor-based controllers, control centers, and other control assemblies and associated equipment applied at voltages in the range of 751V to 15kV, designed for operation at frequencies of 50 or 60 Hz on three-phase systems. These requirements apply to equipment intended for use in ordinary (nonhazardous) locations and installed in accordance with the applicable local installation codes and standards (see Annex A, Item 1). These requirements, as modified by the applicable national standards for fire pump controllers, also apply to fire pump controllers (see Annex A, Item 2). 1.1.2 This standard also includes requirements for controllers intended for service entrance applications. (See Annex A, Item 3 and Clause 5.204.) 1.1.3 This standard also includes requirements for equipment incorporating solid state switching elements intended for starting, stopping, regulating, controlling, or protecting heating and other resistive loads, having ac voltage ratings in the range of 1501V to 15kV. 1.1.4 This standard also includes requirements for reduced-voltage solid-state controllers. 1.1.5 This standard does not apply to: a) equipment for use in classified (hazardous) locations as defined in the applicable installation codes or standards; b) components contained in contactors and contactor-based controllers for which individual component standards exist; c) auxiliary low voltage control assemblies (see Annex A, Item 4); d) equipment consisting solely of electronic or solid-state devices, circuits, or systems; e) electronic variable speed motor controllers (power conversion equipment); and f) controllers using only solid-state devices in the main circuit.