Discussion Starter · #1 ·
I am wanting to hook up a 15hp, 230V, 3 ph, 3-wire plus ground compressor to an existing subpanel that is fed from a main panel with a 100A, 3 pole breaker plus ground. In the subpanel, two feed wires go to the main lugs, one wire labeled white goes to one ground bar and the ground wire to the other bar. There is an existing 2 pole 70A breaker in the subpanel. Can I hook up red and black from compressor to 2 pole breaker with white to same ground bar as feeder and ground to other bar? Is this configuration a delta system? Is it more advantageous or necessary to convert the subpanel to three main lugs and add a 3 pole breaker?