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. 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 full balanced power to your entire home.
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