||08-18-2011 07:14 PM
Grounding sub-panel at pool house
My read of the NEC is that sub-panels should never have the neutral and ground bonded together. I also understand that separate structures require their own grounding rod. So, here's my issue:
We have a pool-house roughly 100' from the main house. I have already run 1.5" grey PVC electrical conduit in a 125' trench containing four 6 gauge conductors with the intent of setting up a sub-panel. I believe based on the wire gauge and temperature ratings, I can use a 60 or 65A 2P breaker for this run to a main-lug sub-panel with separate grounding and neutral terminal strips. The issue I don't understand is do I really need to use a grounding rod at the pool house? If so, do I connect it into the grounding bar of the sub-panel? Do I still need to bring ground in from the main panel's grounding bar, or do I not need to use the 6 ga ground wire I have in the conduit? My sense is that even with a separate ground rod at the pool house, it would be best to connect the two grounding rods together with that 6 ga wire. I really don't understand the purpose of having a separate grounding rod at the pool house.
Thanks for any and all info.