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Old 10-19-2019, 06:11 PM   #1 (permalink)
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Home wiring / transfer switch panel issue

OK so I'm a total fawking idiot when it come to home wiring, for some reason my mind just can't grasp it.

Anyway, the PO installed a 30 amp transfer switch panel for a genset. I've got a 10K generator to power the switch using a L14 plug. When I power up the genset, flip the transfer switches all is good EXCEPT I'm getting voltage in circuits not even wired into the transfer switch panel WTF.

Example - The electric water heater isn't even part of the transfer switch panel, but with my 200 main shut off, and all transfer switches flipped to "GEN", I get 80 volts at my hot water heater. How is this even possible. The only way to eliminate it is by turning off my main breakers.

Any ideas?
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Old 10-19-2019, 06:38 PM   #2 (permalink)
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Do you have a picture of the setup? You are getting 80 volts to what? Phase to phase or phase to ground?
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Old 10-19-2019, 06:48 PM   #3 (permalink)
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Touch your tongue to it and see if it's got any oopf behind it.

Either your transfer switch is somehow not fully disconnecting from the main feed or you're just seeing bleed over voltage that doesn't have much current behind it.
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Old 10-19-2019, 06:51 PM   #4 (permalink)
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Most transfer switches don't switch the neutral, so you're probably reading the potential voltage of an unbalanced load across the neutral.
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Old 10-19-2019, 07:04 PM   #5 (permalink)
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Quote:
Originally Posted by #1SomeGuy View Post
Most transfer switches don't switch the neutral, so you're probably reading the potential voltage of an unbalanced load across the neutral.
Most water heaters don't have a neutral...

I agree though that there's probably no amps behind those volts. Easy way to tell is to intentionally short the 80 volts to ground. If there's no spark then it's just induced voltage.
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Old 10-19-2019, 07:33 PM   #6 (permalink)
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Most water heaters don't have a neutral...

I agree though that there's probably no amps behind those volts. Easy way to tell is to intentionally short the 80 volts to ground. If there's no spark then it's just induced voltage.

Well...depends if it's electric or not. Most gas fired ones run on 120v.
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Old 10-19-2019, 08:02 PM   #7 (permalink)
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Water heater is electric.

I have no idea what the hell is wrong with it, everything on the main is getting "some" power, but only the transfer switch circuits have full juice ie 120V or 240V.

The non transfer switch circuits read much lower volts, but have enough behind it to make whatever is on the circuit do some funky shit, like flicker lights.

This house is jacked. 1976 with like 3 remodels on it - wires going everywhere.

Time to call a pro.
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Old 10-19-2019, 08:06 PM   #8 (permalink)
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