I was replacing the plug for my washer and dryer. It is a 120V 20Amp plug. I turned off the circuit breaker and while I was unscrewing the outlet from the box, the light over me flickered. The plug was hooked up with the black, white and ground wires. I measured the lines and found the black wire to ground had 21VAC(??). The white to ground had no voltage. I also noticed that the circuit continues via another wire going out of the box.
Here is the layout of the wires.
I will call the wires incoming (the one I believe is going to the circuit breaker) and outgoing.
Incoming White - Plug
Incoming Black - Plug
Incoming Red - Outgoing Black
Outgoing White - Plug (Shared with Incoming White)
Incoming Ground - Outgoing Ground - Plug
When I unscrewed the connection for one of the white wires, I saw a tiny spark and the light went out in my laundry room. I know that light is on another circuit breaker. Well, at least when I turn off that other circuit breaker that light doesn't work.
If I turn off the circuit breaker for the laundry room light, the 21VAC goes away.
Is it possible that the since my washer/dryer isn't using 220, they are using the other 110 line to "help" another circuit?
Any idea on why I would get 21V AC on the line?
Do I need an electrician or should I just hook up the new plug the same way it was hooked up before?
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