Experiencing a sudden power outage restricted to only one side of your house or half of your electrical service panel typically indicates a dropped leg of incoming utility power, a tripped double-pole breaker, or a major branch circuit fault. When one of the two incoming 120-volt hot service lines from the utility transformer fails due to a damaged drop cable or blown fuse at the pole, half of your home's circuits lose voltage entirely, causing half the lights and outlets to die while the other half works. Alternatively, a tripped multi-pole breaker can isolate half a panel. You can troubleshoot partial outages safely by checking your service panel layout and observing neighboring homes. You can verify that your corrective action is successful when resetting a tripped main breaker or having your electric utility company repair a damaged service drop restores balanced power to your entire home.
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