Service grounding

[nickelec]

I have a situation where a service for a property comes in to shed type structure, the office and actual place where the business is being done is a separate structure from said shed

The water main for the building comes in to the office not the shed

My question is if we run a feeder from the service , bond the neutral at the service like we should and install an isolated neutral at the office structure with it's on GES do we just drive two grounds rod at the service and be done

My thoughts are that the metallic water system needs to also be bonded to the GES and the separate structure.

I could not find anything in the code book about this besides the fact that all electrodes need to be bonded

Thoughts?



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[LarryFine]

Neutral bonded at service, isolated at main building, electrodes at both.

Electrodes bonded to neutral and EGC at service, EGC at main structure.

The feeder's EGC will also inter-connect the two structures' electrodes.

 

[zbang]

Seems to me that you do two rods at the service/shed and that's the service GES. The water pipe isn't relevant because it's not at that structure.

When you get to the next structure, you use whatever grounding electrodes you have and bond them to the feeder's EGC- whether it's a CEE, a water pipe, or rods.