Please help refresh my memory on a grounding issue.

I have a fused disconnect (600 amp)on a pole 200 feet away from a metal building.

Interior panel (400 amp) will be removed and (3) 200 amp panels installed. Planning to lug from inside a gutter at the building, 2/0 THHN conductors to each panel. There is no grounding conductor in the PVC conduit running back to the disconnect with the feeder.

Therefore, I would like to ask the proper way to ground each of these 200 amp panels heated from a common gutter with no ground back to the disconnect. The previous 400 amp panel was grounded at the building with a grounding electrode but now the 400 amp is not there and there are (3) 200 amp panels. The 600 amp disconnect is also grounded at the pole via a ground rod too.

Can I install a grounding electrode for each 200 amp panel without a concern of circulating currents? Would this be considered double bonding or even triple bonding? Sure would appreciate some feedback.

Thanks.


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