In the main service panel there are 2 bus bars ( neutral and ground ). I don't have any screw holes left to add an additional branch circuit to a detached subpanel located 60' away from the main. Can I: 1. Add an additional bus bar to the main panel and if so, how do I connect it to the old bus bar(s)? or 2. Replace the entire full bus bar with a new longer one, or 3. Neither of the above 2 can be done at all???? If this is so, what can I do to solve this problem?
In the subpanel, the bus bar that is away from the breaker panel itself that I added to the subpanel box, does that bus bar become the ground bar or the neutral bar? I think it's the ground bar because it IS separate from the rest ( not bonded ). Is this the right thinking on that?