Re: Single or double pole?
220 absolutely requires a double-pole breaker, because the circuit will have two "hot" lines -- nominally, 120V from line to ground/neutral and 240V from line to line.
If the existing circuit was wired by someone other than a licensed electrician, there's no guarantee that it's wired properly. Don't assume that just because the outlet has "250V" stamped on it that's what's actually running to it; use a voltmeter to be sure.
All "hot" legs of a circuit require proper overcurrent protection.
Last edited by Fencepost; 05-14-2014 at 04:53 PM.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.