Reply by runswithscissors

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Posted on Need advice on Table Saw

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2767 posts in 2052 days

#1 posted 02-03-2013 05:20 AM

I would like to hear other opinions on the necessity for 3 wires for 220v. I see a lot (and have done so myself) of wiring that uses 10-2 or 12-2 (you don’t need bigger wire for 220v.—in fact, you can get away with smaller wire, though I never use less than 12-2). All you need to do with 12-2 is to tape or paint—or use a black felt marker—the end of the white wire. That’s to show that it is not being used as the neutral. The only reason I know of to use 3 wire cable is when you are going to have both 220v and 110v. on the same circuit, as on a kitchen range. I use 12-2 on all my 220 circuits and they operate just fine. There is, of course, a ground wire as well.

It really surprised me in Australia that all the outlets are 220v, and none have a ground. All simple 2 prong outlets. How do they get away without a ground wire?

Surely some LJ can give a definitive answer as to the 2 vs. 3 wire question?

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