New one on me...for the electricians
SIL and her husband bought a new to them fiver this year. Last night when they got to the unit, sitting on a seasonal site,the water in the tank was already hot. The power switch for the tank was in t...
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Wild guess, but I would check to see if the polarity at the 30 amp receptacle is reversed, simply because I don't like coincidences. Reversed polarity would cause power to be distributed to the heater even with the switch in the off position. There would still need to be some weird short or shunt to a ground or the neutral, but I guess it could be possible. One incident I would say failed switch. Two means I check the switches but also start thinking about other, weirder possibilities. A reversed polarity situation is somewhat common and easily corrected. To check, the hot side should be the left hand slot when looking at the receptacle. Use a multimeter/voltmeter to check the voltage between that slot and the U shaped ground. It should read about 120 volts. Then test the right slot to the U shaped ground, it should have no voltage. If they are reversed, the park wiring needs to be reversed. If both tests read 120 volts, there are bigger problems. That would be a good 2nd stop in your investigation.
