That is only true if all of the other Grounding Electrode Conductors also come together at that grounding buss bar. I know that the code does not specifically say that but most inspectors will reject it as an unlawful splice if it is not in fact a single common grounding point.
-- Tom Horne
Well, that shouldn't be too hard for him to manage, since right now he just has the one (to the water pipe, more than 5' from the entrance) and he's planning to add one more -- easy enough to tie them together at one point.
As I read 205.64(C)(3), yes, you can install a busbar right there. There does not appear to be a requirement to have it in a box; it's grounded, after all, so it hardly matters if someone touches it. To attach it, I believe I'd just use wood screws into a joist -- but you might want to run that past your local inspection authority.
Code says connections may be made "with a listed connector" which I assume would include the terminal screws on a busbar -- but probably not a clamp, unless that clamp is listed for use with that bar.
Either one should be fairly easy for an electrician to install.
The receptacle ground wires may, as far as I know, be attached anywhere on the grounding electrode system. That would include a busbar.
It certainly does no harm, except to your wallet, for him to install a ground busbar in the service panel -- but it does no good either: since Code requires ground and neutral to be bonded together in the service panel, electrically they're all one bar anyway.
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