> 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.

Regards,
Bob

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