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IEEE 303-2023

Current Revision

IEEE Recommended Practice for Auxiliary Devices for Motors in Class I,- Groups A, B, C, and D, Division 2 Locations

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Revision Standard - Active. 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 I, Division 2 and Zone 2 and Class II, Division 2 and Zone 22 under commonly used worldwide regulations. These regulations are: the National Electrical Code® (NEC®); the Canadian Electrical Code (CE Code); and combined practices of the International Electrotechnical Commission (IEC). Included is a list of source documents, definitions and nomenclature. Devices include terminal housings, heaters, surge protection, power factor correction capacitors, shaft bonding (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 Class I, Division 2 or Zone 2 areas or Class II, Division 2 areas or Zone 22 areas under the practice of NFPA 70, National Electrical Code® (NEC®) and CSA C22.1, Canadian Electric Code (CE Code).6 This recommended practice is not an attempt to rewrite or otherwise supersede applicable sections or clauses of these noted documents or any other codes or ordinances. Rather, it is intended to serve as a supplement to existing codes that in this area may not be sufficiently specific to serve as a guide to good engineering practice.
The following information is intended to bring together a brief description of basic electrical practices with regard to the application and installation of auxiliary devices to rotating electrical machines operating in Class I, Division 2 or Zone 2 or Class II, Division 2 or Zone 22 locations using the NEC and the CE Code. It should be understood that this information is only a recommended practice to promote consistent application of such devices and must be used with sound engineering judgment.

SDO IEEE: Institute of Electrical and Electronics Engineers
Document Number 303
Publication Date Feb. 21, 2024
Language en - English
Page Count 26
Revision Level
Supercedes
Committee Petroleum and Chemical Industry
Publish Date Document Id Type View
Feb. 21, 2024 303-2023 Revision
Dec. 17, 2004 303-2004 Revision
Oct. 24, 1991 303-1991 Revision
June 13, 1984 303-1984 Revision
June 30, 1969 303-1969 Revision