I'm running 12/2 for a 220v circuit that feeds a couple pieces of woodworking machinery. I was going to use 12/2, but it occurs to me that perhaps the white conductor can't be connected to the other hot leg.
Is it neccessary to use 12/3 for this wiring? And if so, what do you do with the white conductor? Just leave it capped in all the boxes? There's nothing to connect it to at the boxes where the machinery is wired.