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
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?
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.
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?
"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
Do you still have the diagrams on the inside of the panel door? Some panels
do not allow every full breaker space to be used as a twin. Quite often 20
full size spaces will only support 30 breakers, and they tell you which ones
can be twinned. In addition, the older panels had less space for the wire,
so they were marginal at full capacity from a practical, wire management
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