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Another possibility is that your neutral wiring is in poor repair. When that happens, each side of the 240 is allowed to float with respect to ground, one side can be 150, and the other 90, dependent upon load. This often happens when the outer sheath of older service entrance cable deteriorates, exposing the neutral conductors to air and moisture, and if aluminum, they will fail in short order.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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