(01-04-2017, 09:56 PM)JarvisD Wrote: RE: electrical hookups. I am likely looking at 120 volt saws. I will be running a 220 circuit for a newly acquired dust collector. I'm assuming that I can't run both the saw and the dust collector off of the same 220 circuit...although if that isn't correct, let me know. Don't have room in the breaker box for running two 220 lines...at least not without getting creative.
If you can run a 20A or 30A 240V circuit to your shop for your new DC, you can run a 30A or 50A 120/240V circuit instead, put an inexpensive main lugs panel in your shop, and be able to run circuits of any ampacity to anywhere in your shop. Or just drop a couple right next to the panel with conduit if you don't know what you want to do yet.
You need a 3-wire with ground cable instead of 2-wire w/ ground, as you need to carry the neutral to the new panel also. But other than that, it's no more work, and takes no more room in your main panel (double-pole breaker). You don't need a main breaker in the subpanel, but you certainly
can have one if you like, and it can be used as a shut-off for shop receptacles and machines. 100A or 125A is the most common for such panels, but the feeder will be protected at whatever the breaker's ampacity is in the main panel, so a big main breaker is perfectly legal (it's just a shut-off at that point).
I wouldn't make a major TS decision with the built-in restriction of 120V only operation unless you really have to stick to the lower voltage. Though contractor and hybrid saws can be perfectly satisfactory, and can run strong if the wire run is 12 gauge copper or better, and is relatively short.
I used this one in my shop, mainly because the other panels in the house are QO, and I wanted to maintain interchangeability of breakers. But larger ones with more spaces are just as cheap. I didn't want a larger one, and this one can have up to 16 circuits (2-pole loads count as two circuits in this case) with duplex and half-height breakers.
http://www.homedepot.com/p/Square-D-QO-1.../100136882
Front left to right: 15A lights, 20A DC, 2 x 20A general purpose receptacle circuits, 20A 240V large tool circuit (with 5 receptacles), 50A 120/240V welder (in garage).
Just sayin'.