Arc fault circuit interrupters:  electrical

Arc fault circuit interrupters (AFCIs) involve a technology that detects arcing-faults in electrical circuits that could cause fires. By recognizing characteristics unique to arcing and functioning to de-energize the circuit when an arc-fault is detected, AFCIs further reduce the risk of fire beyond the scope of conventional fuses and circuit breakers.

Effective Jan. 1, 2002, NFPA 70, the National Electrical Code®(NEC), Section 210-12, requires that all branch circuits supplying 125V, single phase, 15- and 20-ampere outlets installed in dwelling unit bedrooms be protected by an arc fault circuit interrupter.

This information is intended to assist authorities having jurisdiction (AHJs) by providing a reference source of UL information on AFCIs.

The following articles written by UL staff provide background information on the development of UL 1699, the Standard for Safety of Arc-Fault Circuit Interrupters, and issues related to AFCIs.

Outside organization -- Articles published by UL staff

• AFCI Indicators
• AFCIs show promise to save lives by preventing electrical fires (On The Mark Vol. 5, No. 3, 1999)
• Arc-Fault Circuit Interrupters (AFCIs) -- type and performance considerations (2001)
• Responses to specific concerns regarding AFCIs (reprint from September/October 2001 IAEI News)
• Arc fault testing and arc fault scenarios (Jan. 28, 2002)