A system and method for conditioning an alternating current (“AC”) power transmission for supply to a load circuit. In one aspect, the invention is a system comprising: a power conditioning circuit comprising a voltage surge protector for eliminating voltage spikes in the AC power transmission, an inrush current suppressor for limiting the current of the AC power transmission, a filter for reducing electromagnetic interference and radio frequency interference of the AC power transmission, and a voltage sensing circuit for monitoring a voltage level of the AC power transmission; means for electrically coupling the power conditioning circuit to a source of AC power; outlet means for electrically coupling the power conditioning circuit to a load circuit; wherein the voltage sensing circuit monitors the AC power transmission in a rectified un-smoothed state after the AC power transmission has passed through the filter; and wherein upon the voltage sensing circuit detecting that the voltage level of the AC power transmission exceeds a predetermined upper limit, the AC power transmission is prohibited from reaching the outlet means.