I'm wiring a subpanel in free standing garage.
70A circuit, on 4/3 conductor with a ground.There is something that I don't understand: The main panel has a bus that combinds the neutral and ground. As I read about sub-panel wiring, the neutral and ground should be seperate.
The seperate neutral and ground at the subpanel run to the combind bus at the main panel, so electrically speaking, there is continuity there..
Why wire them seperate at the subpanel?