> > ie: your "A" is not only 'better', it is also 'right'.
>
> Not to argue code, but how is it better?  In the main box ground and
neutral are connected so I don't see how having the ground wire in parallel
is any better, especially since there is an earth ground at both locations.
The code also says that if there is an existing three-wire going to the main
box, it can be used as long as the ground wire is insulated, but this can't
be done when running new wiring.

-- Remember the purpose of N vs. G.

The first provides a return path for the current you use, the latter is for
protective purposes only. Under non-fault conditions there will be no
current in any G wiring, so by definition no 'ground loop' issues.

N can float a few volts above G under heavy load, but short of a fault
shouldn't be any higher than that.

Bob Ammerman
RAm Systems

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