# 120v versus 240v for a saw

• posted on November 3, 2003, 8:39 pm
I know this has been covered ad nauseum, but this is a bit different.
I was about to install a 240v-20a line for a new saw and DC, when I found the breaker I needed (a 20-20 quad; they have 20-30s everywhere) wasn't available locally.
I thought about it and wonder if a 20a multiwire circuit wouldn't work just as well, and maybe be more versatile. The saw I am looking at is 15a (120v) and the DC is 12a, so with both going there wouldn't be any more voltage drop than with a 240v circuit. (Presumably the advantage of 240v circuit is the reduced voltage drop.)
Am I overlooking something?
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• posted on November 4, 2003, 12:27 am

just
(120v)
is
I'm not sure you made your question clear. You want to do what?
--
Jim in NC

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• posted on November 4, 2003, 1:10 am
On Mon, 03 Nov 2003 20:39:41 GMT, "Wade Lippman"

You may need to so go to an electrical shop to the breaker you need. There is less current needed with 240v (P = I * E * power factor) and the motors will operate more effeciently with smoother start/stops.
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• posted on November 4, 2003, 4:15 am
Define a "quad" breaker.
Erik

just
(120v)
is
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• posted on November 4, 2003, 2:22 pm
Erik Ahrens wrote:

Four half space breakers that fit in two spaces, which gives you two 240 V circuits. The inner and outer pair are linked together.

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• posted on November 4, 2003, 3:17 pm

The only way I have seen this done was with the old style SqD QO double breakers (2 big handles) and handle ties. Wouldn't it be easier (cheaper) to double up a couple of 120v circuits and free up 2 slots?
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• posted on November 4, 2003, 4:21 pm

V
to
Unfortunately, everything else is already doubled up. Siemens has a full line of this kind of stuff, but the one I need is not available locally.
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• posted on November 4, 2003, 4:37 pm

"Not available locally" is a bit unlikely, unless you live someplace that's *really* rural. :-) My guess is you haven't looked in the right places yet. Three things to try:
1. Ace Hardware often has a much wider selection than Lowe's, Home Depot, etc. when it comes to "specialty" breakers such as this. TruValu Hardware is worth a try, too.
2. If you're in, or anywhere near, a city of decent size, there should be an electrical supply house somewhere not too far away. Maybe even a Grainger store. If they don't have it, they should be able to get it.
3. If all else fails, try online sources such as Dale Electric (www.dale-electric.com). I've bought from these guys several times, good prices, prompt shipping, never any problems.
-- Doug Miller (alphageek at milmac dot com)
How come we choose from just two people to run for president and 50 for Miss America?
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• posted on November 4, 2003, 4:42 pm

You are probably overdue for an upgrade. A sub panel is one option.
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• posted on November 4, 2003, 11:20 pm