If you know that unit is 120, the test would load one leg. if it is wired for partial 220, it would not work. The neutral failure is not tested when a 220 volt draw is applied, as the phase relationship is between hots, not the neutral. Load only one 120volt circuit/phase. It could take 1500 watts on 2 circuits on the same branch to get it into failure mode. Not easy to detect, and sometimes self healing for light loads or loads that are not turned on for a long time (hours). The danger is real to much of the equipment in your place. it will get 220 on one leg eventually and near nothing on the other. It can be at the wetherhead, the incoming neutral bond to the panel, at the pole connections at the wires, or the meter internal neutral connects, or the transformer. Best of luck finding it it will not go away. Jim
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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