Preface 

This is the harmonized ANCE, CSA Group, and UL standard for Fuseholders – Part 6: Class H. It is the second edition of NMX-J-009/4248/6-ANCE, the second edition of CSA C22.2 No. 4248-6, and the second edition of UL 4248-6. This edition of NMX-J-009/4248/6-ANCE, CSA-C22.2 No. 4248-6, and UL 4248-6 supersedes the previous edition published on February 28, 2007. This harmonized standard was prepared by the Association of Standardization and Certification (ANCE), CSA Group, and ULSE. The efforts and support of the CANENA Technical Harmonization Subcommittee 32B – Fuseholders are gratefully appreciated. 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 32, Fusibles from the Comite de Normalizacion de la Asociacion de Normalizacion y Certificacion, A.C., CONANCE, with the collaboration of the fuses manufacturers and users. This standard was reviewed by the CSA Subcommittee on Fuses and Fuseholders, 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 This Part is intended to be read together with the Standard for Fuseholders – Part 1: General Requirements, hereafter referred to as Part 1. The titles of the Clauses in this Part correspond to the similarly titled Clauses in Part 1. The requirements of Part 1 apply unless modified by this Part. For the Part 1 requirements, refer to the Standard for Fuseholders – Part 1: General Requirements, NMX-J-009-4248/1-ANCE / CSA C22.2 No. 4248.1 / UL 4248-1. 

1.2 These requirements cover fuseholders intended for use with Class H Fuses as described in NMX-J-009/248/6-2000-ANCE, CSA C22.2 No. 248.6, UL 248-6, Low-Voltage Fuses – Part 6: Class H Non-Renewable; and NMX-J-009/248/7-2000-ANCE, CSA C22.2 No. 248.7, UL 248-7, Low-Voltage Fuses – Part 7: Class H Renewable Fuses. 1.3 Fuseholders also intended for fuses covered by other Parts shall also comply with the applicable fuseholder requirements for that Part.