Detached building neutral bonding

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MLM1

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When conducting a real estate inspection today I noticed the home?s distribution panel (which is a actually a branch panel as the 200amp main is at the detached garage) where the ground and neutrals were correctly separated, but the neutrals had a ground conductor to the h20 pipe?well, so do the equipment grounds?doesn?t that effectively bond the two at a remote location? Is that compliant?
 
The water pipe should be bonded to the equipment grounding conductor but not to the neutral (grounded conductor). The way you describe it, there is a parallel path present.
 
Are there three conductors or four in the feeder to the dwelling? Is there a grounding conductor installed to the dwelling or it it neutral grounded as permitted in 250.32? Are there any other metallic paths, grounded in both locations between the two structures?
 
Four wire, plastic conduit. The h20 pipe runs to the garage where grounding rod and h20 pipe are used.
 
Then the grounds and neutrals will be separated in the panel in the house. The waterline would be bonded to the equipment grounding conductors in the house panel. There should be NO connection form the waterline to the neutral conductors. You are correct, there is now a parallel path for neutral currents.
 
haskindm said:
Then the grounds and neutrals will be separated in the panel in the house. The waterline would be bonded to the equipment grounding conductors in the house panel. There should be NO connection form the waterline to the neutral conductors. You are correct, there is now a parallel path for neutral currents.
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I second that emotion.
 
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