Preface 

This is the harmonized ANCE, CSA Group, and UL standard for Electric Motors and Generators for Use in Hazardous (Classified) Locations. It is the second edition of NMX-J-652-ANCE, the fourth edition of CSA C22.2 No. 145, and the sixth edition of UL 674. This edition of CSA C22.2 No. 145 supersedes the previous editions published in 1972, 1986 and 2011. This edition of UL 674 supersedes the previous edition published in 2011. This harmonized standard was prepared by the Association of Standardization and Certification (ANCE), the Canadian Standards Association (CSA), and Underwriters Laboratories Inc. (UL). The efforts and support of the CANENA Technical Harmonization Committee are gratefully acknowledged. This standard is considered suitable for use for conformity assessment within the stated scope of the standard. This standard was reviewed by the CSA Integrated Committee on Hazardous Location 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. 

Scope 

1.1 This standard applies to electric motors and generators or submersible and nonsubmersible sewage pumps and systems suitable for use in Class I, Division 1, Groups B, C and D, and Class II, Division 1, Groups E, F and G, hazardous (classified) locations as defined by CSA C22.1 Canadian Electrical Code, Part I (CE Code), the National Electrical Code, ANSI/NFPA 70 (NEC), and NOM-001-SEDE. Note: In the US, the application "hazardous locations" is referred to as "hazardous (classified) locations". 

1.2 This standard covers the same type of electrical equipment indicated in 1.1 for installation and use in Class I, Zone 1, Groups IIA and IIB, IIB+H2, and Zone 20 and 21 hazardous locations. 

1.3 This standard also covers other rotating machinery such as, but not limited to, electric brakes, tachometers, encoders, and slip rings. 

1.4 This standard does not address types of protection other than explosion-proof or dust-ignition-proof. 

1.5 For Canada Only – This standard does not include Canadian energy efficiency or product performance requirements. For such requirements, see Annex A, item 19. It is possible that item 19 is referenced in whole or in part in federal, provincial, territorial, or local laws or regulations relating to energy efficiency or product performance. The appropriate governmental authorities should be consulted to confirm whether item 19 has been referenced in laws or regulations. Note: This standard also does not include U.S. energy efficiency requirements for electric motors used in hazardous (classified) locations.