sub-panel, main panel grounding
Concerning installing a sub-panel, I just need one thing clarified...I realize and understand the neutral must be isolated from the ground in the sub-panel, and I have done that.
However, in the main panel the neutral and gnd. are on the same buss bar.
So my question is, should I attach the ground from the sub-panel to the neutral/gnd buss bar in the main panel, or attach it to the main's case?