480
I work with a lot of 480 and 4160 volts. First thing first. If you don't know electrical call an electrition. You can take that from our graveyard ass. chief Stubby.
I have two houses. My second one is an old one from the early 1900's. Pre electricity. When they installed it they ran it along the floorboards. Too much bare wire. I had to redo the whole place. You can always ground to a cold water pipe. This BS about if the pipe corrodes somewhere underground or electrifies the pipe is the old wives tale. As long as that pipe hits ground it does not matter. This ground is a pathway in the circuit. Ground is not the hot wire.
All of this doesn't really matter though. If rewire is done, it must be up to current building codes. These codes will tell you what you can and can't do. Like when I had to rewire my house I had to have receptacles every six feet. Follow the code and you will have a safe wire system and it's legal. No fines.
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