When an electrical outlet suddenly stops working without warning, the abrupt power loss is typically caused by a tripped safety device or a broken connection. The most frequent causes include a tripped Ground Fault Circuit Interrupter (GFCI) safety outlet located nearby, a tripped circuit breaker at the main electrical panel due to an appliance overload, or a wire working loose from a terminal screw under vibration. You can troubleshoot sudden power failures safely using a non-contact voltage tester. You can verify that your corrective action is successful when resetting the upstream GFCI button, flipping the tripped circuit breaker back on, or securing loose terminal wires restores full electrical voltage to the receptacle.
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