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IEEE 303

2004 Edition, June 24, 2004

Complete Document

Recommended Practice for Auxiliary Devices for Rotating Electrical Machines in Class I, Division 2 and Zone 2 Locations

Includes all amendments and changes through Reaffirmation Notice , December 7, 2011

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Description / Abstract:

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 NFPA 70-2005, National Electrical Code® (NEC®),1,2 CSA C22.1-02,3 or Zone 2 areas classified under the practice of IEC 60079- 10-20024 and CENELEC EN 60079-10-1996.5 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 locations using NFPA 70-2005, National Electrical Code, CSA C22.1-02, or Zone 2 locations using IEC 60079-14-2002 and CENELEC EN 60079-14-1997. 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.

1NFPA publications are available from Publications Sales, National Fire Protection Association, 1 Batterymarch Park, P.O. Box 9101, Quincy, MA 02269-9101, USA (http://www.nfpa.org/).

2National Electric Code and NEC are both registered trademarks of the National Fire Protection Association, Inc.

3CSA publications are available from the Canadian Standards Association, 5060 Spectrum Way, Mississauga, Ontario L4W 5N6, Canada (http://www.csa.ca/standards/).

4IEC publications are available from the IEC Central Office, 3, rue de Varembé, P.O. Box 131, Switzerland (http://www.iec.ch/).

5CENELEC publications are available from the Cenelec CS Info & Publications Department, Rue de Stassartstraat 35, 1050 Brussels (http://www.cenelec.org/).