Losing one leg of incoming 240-volt electrical service—which results in a partial power outage where half of your home's 120-volt circuits and appliances stop working—is a serious electrical issue that requires professional intervention. If the problem originates from a blown utility transformer fuse or a snapped overhead service drop cable coming from the power pole, you must contact your local electric utility company immediately to dispatch a line crew for emergency repairs. If the issue stems from a loose main breaker lug inside your service panel, a licensed electrician must service it. You can troubleshoot utility issues safely by checking if neighbors share the outage. You can verify that your corrective action is successful when utility crews repair the outdoor drop line or an electrician secures panel lugs, restoring full two-leg 240-volt power.
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