A partial loss of electrical power in a residential home—where some lights and appliances work while others do not—is typically caused by specific electrical faults in the distribution system. Common causes include a tripped single-pole or double-pole circuit breaker, a tripped upstream Ground Fault Circuit Interrupter (GFCI) receptacle, loose terminal connections inside junction boxes, or a dropped leg of incoming power from the utility company where one of the two 120-volt service lines fails. You can troubleshoot partial power outages safely by checking your service panel layout. You can verify that your corrective action is successful when resetting tripped breakers, securing loose junction box wire nuts, or contacting your electric utility provider to repair a damaged service drop line restores full balanced voltage to your entire home distribution system.
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