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Any technician who travels for a service call and proves 240 volts on one leg. especially momentarily, aaaaannnnddd leaves with a payment without fixing a serious issue like this is very irresponsible. Arcing , which is what is going on here, is the first major cause of fires electrically. I know you don't want to hear from me but there are others who will read this. North America uses single phase power 120/240 volt because our bodies retain enough of an average resistance so that if we come into contact with one side of the hot bar in a panel, we have the ability to reflex and pull away. If you touch both hot bars at the same time , you will not fare so well. I hope that breaker was not on all night.
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