CSA C22.2 NO. 5:25

Preface This is the harmonized ANCE, CSA Group, and ULSE standard for Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures. It is the sixth edition of NMX-J-266-ANCE, the fifth edition of CSA C22.2 No. 5, and the fourteenth edition of UL 489. This edition of NMX-J-266-ANCE supersedes the previous edition published on April 22, 2019. This edition of CSA C22.2 No. 5 supersedes the previous edition published October, 2016. This edition of UL 489 supersedes the previous edition published on April 22, 2019. 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, 121A, Molded Case Circuit Breakers 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 Distribución Industrial from the Comite de Normalizacion de la Asociacion de Normalizacion y Certificacion, A.C., CONANCE, with the collaboration of the circuit breaker manufacturers and users. This Standard was reviewed by the CSA Subcommittee on Molded Case Circuit Breakers, Molded Case Switches and Circuit Breaker Enclosures 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 The requirements of this Standard applies to molded-case circuit breakers, circuit breaker and ground-fault circuit-interrupters, fused circuit breakers, high-fault protectors, and high-fault modules. These circuit breakers are specifically intended to provide service entrance, feeder, and branch circuit protection in accordance with the National Installation Codes in Annex B, Ref. No. 1. This Standard also covers instantaneous-trip circuit breakers (circuit interrupters) specifically intended for use as part of a combination motor controller in accordance with the National Installation Codes in Annex B, Ref. No. 1. 1.2 This Standard applies to molded-case switches and fused molded-case switches. 1.3 This Standard applies to devices rated at 1000 volts ac and 1500 volts dc or less and 6000 amperes or less. 1.4 The devices referenced in 1.1 and 1.2 are intended for installation in an overall enclosure or as parts of other devices such as panelboards. The acceptability of the combination will be determined when the complete product is investigated. 1.5 This Standard applies to circuit-breaker enclosures and accessory devices intended for use with the devices described in 1.1 and 1.2. 1.6 This Standard does not apply to low-voltage power circuit breakers covered in Annex B, Ref. No. 3 and Ref. No. 4 or supplementary protectors covered in Annex B, Ref. No. 5. 1.7 This Standard contains supplements covering the requirements for molded-case circuit breakers for: a) Marine Use; b) Naval Use; c) Uninterruptible Power Supply Use; d) Classified Circuit Breakers; e) Software in Programmable Components; f) Additional Tests for Circuit Breakers with Electronic Overcurrent Protection; g) Electromagnetic Compatibility (EMC) – Requirements and Test Methods for Circuit Breakers; and h) Molded-Case Circuit Breakers with Additional Motor Overload Protection.