Originally Posted by
Jerry Peck
- From the above question, the "feeders" *REQUIRE* 4 wires: 'hot' 'hot' 'neutral' 'ground', and less and you have a problem. 'Ground' "could be" metal conduit, however, you stated PVC, thus the "ground" must be a separate conductor - i.e., 4 conductors from the service equipment panel to any other panel.
Correct me if I am wrong, but I'm certain that the NEC will allow the other panel (sub, auxilliary, secondary, whatever you want to call it) to be grounded via a grounding rod, UFER ground or water piping if it meets the separation requirements from the main service panel ground.
I realize that there are other issues with this service that are unclear on this post at this time, but the main home should have already had a ground at the time of construction. Unless this is grounded via the water pipes and they are shared between the buildings, it should be grounded, IMO.