An Arc-Fault Circuit Interrupter (AFCI) breaker trips when its advanced internal microprocessor detects unintended electrical arcing, which produces erratic high-frequency electrical waveforms characteristic of sparking wires. Common triggers include damaged power cords with frayed insulation, loose terminal screw connections behind wall outlets, nails or screws piercing romex cables inside drywall, faulty appliance switches creating internal sparks, or loose wire nuts inside junction boxes. Additionally, older appliances with brush-type motors like vacuum cleaners or hair dryers can sometimes generate harmless operational micro-arcs that trick sensitive AFCI sensors. You can troubleshoot nuisance tripping safely by unplugging appliances. You can verify that your corrective action is successful when replacing frayed cords or securing loose connections stops the unwanted tripping and keeps the AFCI breaker stable.
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