Generator with 400amp automatic transfer

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warriorelectrician

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Anacortes Washington
I have a job a customer wants me to do and I pretty sure that is more involved than he thinks. My issue is I have a 400amp CT can outside mounted on a pole not attatched to the building this 400amp service is feeding 3-200amp panels two in the house one to a well house. If I run the feeder wires from the CT can to a 400 amp breaker inside of the automatic transfer switch and I run all the feeders feeding each panel through this transfer switch as well this is now considered the main service equipment (Right?). If this is the case now I have to run ground wires feeding each panel because those are now considered sub-panels. This is what I have done for all of my other installs. This one is a real problem because the pump house is about 500' away and each panel in the house is about 200' away. The only way to add a ground wire would be to pull them out and pull them back in with a ground. Am I right with this or is there another way? Help
 
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warriorelectrician said:
The only way to add a ground wire would be to pull them out and pull them back in with a ground. Am I right with this or is there another way?
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Quick questions:

1) Is the underground water piping between buildings metal or plastic?

2) Is there any other electrical or low-voltage wiring between buildings?
 
warriorelectrician said:
help me please
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I am. Read NEC 250.32(B)(2).

Okay, I'll post it here:

Grounded Conductor. Where (1) an equipment grounding conductor is not run with the supply to the building or structure, (2) there are no continuous metallic paths bonded to the grounding system in both buildings or structures involved, and (3) ground-fault protection of equipment has not been installed on the common ac service, the grounded circuit conductor run with the supply to the building or structure shall be connected to the building or structure disconnecting means and to the grounding electrode(s) and shall be used for grounding or bonding of equipment, structures, or frames required to be grounded or bonded. The size of the grounded conductor shall not be smaller than the larger of

(1) That required by 220.22
(2) That required by 250.122

Now, I'm not sure that this overrides the fact that it will be after the 400a main disconnect. Perhaps someone else will chime in.
 
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Ok I talked to the inspector and here is what he wants me to do. He said he will granfather in the existing wires feeding each panel, but he wants disconnects on the load side of the transfer switch. Basicily I need three 200amp disconnects. I think it would be easier to pull in ground wires.
 
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