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Arc Fault Circuit Interrupter (AFCI) is a type of duplex receptacle or circuit breaker that breaks the circuit when it detects a dangerous electrical arc in order to prevent electrical fires. An AFCI distinguishes between a harmless arc that occurs incidental to normal operation of switches, plugs, and an undesirable arc that can occur. For instance, a luminaire has a broken wire.

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AFCI breakers have been required for circuits feeding electrical outlets in bedrooms of homes by the electrical codes of Canada in recent years. Arc faults in a home are one of the leading causes for electrical wiring fires. Each year in the United States, over 5,000 fires are attributed to home electrical wiring. These fires result in dozens of deaths and over a hundred injuries each year.