NEMA 280 Application Guide for Ground Fault Circuit Interrupters
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NEMA 280 Document Information:
Title
Application Guide for Ground Fault Circuit Interrupters
National Electrical Manufacturers Association
Publication Date:
Jan 1, 1990
Scope:
This application guide covers ground fault circuit intermpiem (GFCI's) which are intended to provide electrical shock hazard protection from line-to-ground fault currents on grounded circuits of 120, 120D0, 240 volt single phase, 208Y/120 volt, and 240 volt three-phase; two, three, and four-wire supplies.
GFCi's are designated as Class A or Class B in accordance with UL Standard 943 (January 1985), Ground Fault Circuit Intempters.* Unless otherwise indicated, this application guide applies to class A GFCI'S.
Covered in this guide are characteristics of the various types of GFCI's, construction details, markhg data, installation guidelines, field testhg recommendations, and field troubleshooting information.
*Copies are available from Underwriters Laboratories Inc., 333 Pfingsten Road, Northbrodt, IL 60062
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