On a recent new service inspection, I ran into a number of conditions I was unclear about. I would appreciate some opinions (with code references) about the following:
1. On 100 and 200 amp services, are 2 ground rods required if a copper water main is unavailable?
2. On a 400 amp 3 phase CT service, can the neutral be bonded to the ground in the CT can or should it be bonded only at the main disconnect? Could it be bonded at the Ct can and not bonded in the disconnect.
3. Can couplings be used as short nipples with chase nipples on each end?
4. Do all nipples larger than 1 1/2" require a ground bushing or only if you use KOs?
5. If ground bushings are required, are meyer's hubs OK without ground bushings?
6. Is it OK to have 6 - 3/0 cu conductors with 2 - 3/0 neutrals in a 3" GRC service mast for a 400 amp panel with 75ยบ rated panel?
