This recommended practice applies to the application and installation procedures of auxiliary devices in or on electric rotating machines that are employed in hazardous locations classified as Class 1, Division 2 or Class I Zone 2 under commonly used worldwide regulations. These regulations are: the National Electrical Code (United States); the Canadian Electrical Code, Part 1 (Canada); and combined practices of the International Electrotechnical Commission (IEC), the European Committee for Electrotechnical Standardization (CENELEC), and Standards Australia / Standards New Zealand (AS/NZS). Included is a list of source documents, definitions and nomenclature. Devices include terminal housings, heaters, surge protection, power factor correction capacitors, shaft grounding, and enclosures. Special marking requirements are also discussed

This recommended practice is limited to auxiliary devices associated with rotating electrical machines operating in Division 2 or Zone 2 areas, classified as Class I under the practice of ANSI/NFPA 70 or Zone 2 areas classified under the practice of IEC/CENELEC EN60079-10:1996.

The following information is intended to bring together a brief description of basic electrical practices in regard to the application and installation of auxiliary devices to rotating electrical machines operating in Division 2 or Zone 2 locations using ANSI/NFPA 70, CEC C22.1-02 (2002), or Zone 2 locations using IEC/CENELEC EN60079-14:1997.