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AFCI (Arc Fault Circuit Interrupters)

An AFCI is a circuit breaker designed to prevent fires by detecting an unintended electrical arc and disconnecting the power before the arc starts a fire. An AFCI must distinguish between a harmless arc that occurs incidental to normal operation of switches, plugs and brushed motors and an undesirable arc that can occur, for example, in a lamp cord that has a broken conductor in the cord.

Arc faults in a home are one of the leading causes for electrical wiring fires.

The Canadian Electrical Code (CSA Standard C22.1), the national codes require AFCIs in all circuits that feed outlets in bedrooms of dwelling units. This requirement is typically accomplished by using a kind of circuit-breaker in the breaker panel that provides combined arc-fault and overcurrent protection.