Bonding Neutral & Ground

[quantum]

We have a 3-wire single phase 240/120V service coming down the pole to an enclosed breaker mounted on the pole. From there, we are required to run 4 conductors from a conduit underground to a building disconnect. The building disconnect is mounted on the exterior of the building and feeds an interior panel.

Here is the problem, an inspector has asked us to bond the ground and the neutral both at service pole breaker and at the building disconnect. This looks like parallel neutrals and a code violation to me. Thoughts?

 

[jumper]

You are correct and inspector is not. Neutral and ground bond only at pole.

You will need a GES at the pole disconnect and the building disconnect.

 

[don_resqcapt19]

It is not permitted by the code to bond a second time. You have it correct with the bonding at the first disconnect and 4 wires to the building. The building will require a grounding electrode system, but the GEC is only connected to the EGC at the building. It is not connected to the grounded conductor.

 

[quantum]

Thanks gentlemen! No further responses required.

 

[quantum]

It is not permitted by the code to bond a second time. You have it correct with the bonding at the first disconnect and 4 wires to the building. The building will require a grounding electrode system, but the GEC is only connected to the EGC at the building. It is not connected to the grounded conductor.

I have another question, couldn't we have just ran 3 conductors (H/H/N) from the service disconnect to the building disconnect and bonded them only at that point?

 

[don_resqcapt19]

I have another question, couldn't we have just ran 3 conductors (H/H/N) from the service disconnect to the building disconnect and bonded them only at that point?

Only if you are on the 2002 or earlier code. Under those older codes you could run 3 wires and bond at both locations.