Arc-fault circuit interrupter: Difference between revisions

Revision as of 23:26, 30 August 2021

Revision as of 01:05, 6 October 2021

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==Operating principle==

The [[electronics]] inside an AFCI breaker detect electrical current alternatingarcing at characteristic frequencies, usually around 100 kHz, known to be associated with wire arcing, which are sustained for more than a few milliseconds. A ''combination AFCI breaker'' provides protection against parallel arcing (line to neutral), series arcing (a loose, broken, or otherwise high resistance segment in a single line), ground arcing (from line or neutral to ground), overload protection and short circuit protection. The AFCI will open the circuit if dangerous continuous arcing is detected.

When installed as the first outlet on a branch circuit, AFCI receptacles provide series arc protection for the entire branch circuit. They also provide parallel arc protection for the branch circuit starting at the AFCI receptacle. Unlike AFCI breakers, AFCI receptacles may be used on any wiring system regardless of the panel.