I recently picked up a 10 hp motor to make an RPC. It runs smoothly on 1 ph if I spin it up, and works on a 40A 240V breaker. I plan to buy a control panel for it so it will start and run reasonably well balanced. The question is- What sized breaker for light use? My mill and surface grinder are only 1 hp. I do have a 3 hp 3ph motor I might put in a belt sander. Will these run (one at a time) on the 40A breaker? I know the 10 hp RPC is overkill for my application, but I would like to get a bigger lathe someday.