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 - Pop's Tractor of Gold - by Gary Teate. My father was a simple man but could repair just about anythin mechanical that was ever made. From the time I was a young boy growing up in Jacksonville, Florida, I would spend a considerable amount of time helping my father repair or rebuild equipment and engines, etc. on our 2 1/2 acre "spread". Pop always dreamed of having more acreage out in the country where he could retire and tinker as much as he wanted and often reminisced about his boyhood days on his grandfathers farm in Montecello,
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