Why is it important to understand devices that prevent electrical arcing and electrical ground faults?

by Nils Deacon, Manager, Inspections and Rating Services

Electrical arcing is one of the most common causes of electrical fires in residential and commercial buildings every year. NFPA’s National Electric Code (NEC) – NFPA 70, provides specific guidance to help prevent these fires.

“Electrical arcing (arc fault) is an unintended electrical discharge through air between conductors or across a gap in a conductor caused by insulation failure, loose connections, or damaged wiring. The resulting high temperatures can ignite nearby combustible materials and cause fires.” Electrical Safety Foundation International (ESFI)

A primary mitigation measure is use of Arc Fault Circuit Interrupters (AFCIs). These devices were introduced over 26 years ago and are required by NFPA for all current electrical installations especially in areas where people congregate, such as living rooms, bedrooms, and kitchens. AFCIs can be thought of as protecting property from electrical fires.

Ground Fault Circuit Interrupters (GFCIs) detect electrical current leakage to a ground, including people and appliances. They monitor the balance of electrical flow between hot and neutral wires and will shut down the power to a receptacle and other receptacles downstream (or following) the one with an issue from a liquid intrusion. They reduce the hazard of electric shock to people. The GFCI receptacle will usually have a recognizable reset button that turns power back on when the hazard has cleared.

Verification that these safety devices are present and properly installed should be noted in an underwriting inspection.

DISCLAIMER: This information reflects the interpretation of MSO, Inc. with regard to NFPA Standards and Codes and other code sources. It does not represent these codes’ official position on the items discussed.

GFCI near a sink.