I recently got my new Delta Unisaw (3hp 230 volt) home to the shop only to discover that Delta had a unique plug on the end of the cord. I spoke with Delta and they confirmed that the plug was a NEMA 6-15P and that I needed to go buy a NEMA 6-15R (single receptacle) so I could rewire the outlet for the plug.
I had a certified electrician wire the shop months ago for this service. He installed a 30 amp breaker with the appropriate gauge wire (#8 or #10 I think) and wired a 250 volt, 30 amp receptacle with the twist lock. these are the kind you can buy at Home Depot. Problem is, Delta’s saw isn’t set up for that and I can’t change the cord configuration or bye-bye warranty.
Now I have the NEMA 6-15R in the wall and the saw works, but I’m not sure I re-wired things correctly. Since it’s 220 volt service I have two hots, one neutral and one ground running to the outlet. My original electrician wired the two hots to the 30 amp 250 volt receptacle (noted above) and put the neutral into the ground slot. So I did the same with the new receptacle. However, I’m not 100% sure this is correct b/c now I have a ground line that’s just sitting inside of the box with nothing to do. I don’t have any more places to stick wires…do I tie the neutral wire or the ground wire to the ground screw? Which one sits loose inside of the box?