||07-15-2012 01:00 PM
2 subpanel questions
1. if i install a subpanel that is fed off of the existing main panel, and i connect the ground of the subpanel to the ground bus on the main panel, does the subpanel still need to be grounded, i.e. connected to a grounding rod outside? i think the answer to this is yes because that is how i was told it needed to be done for my detached shed and i did it like that and everything works fine. however, the one difference here is that both the main and the subpanel are in the same physical building whereas the shed is detached and i was wondering if the grounding requirements may be less strict because of that. if i have to connect it to a new grounding rod, the subpanel option is out the door cause it would be very difficult to set one (very limited patches of dirt between the house and the street).
2. is it possible to put a meter on a subpanel? e.g. if i have tenants living in one of the apartments and they have their own panel with such a meter mounted before the wire goes in, can it be used to gauge their usage vs. the total monthly bill? obviously, the best solution would be to get separate meters but that is hellishly expensive in my area and i cannot afford it right now.