Building Steel

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GFH

Member
I have a 600amp servie on a steel frame building. My grounding electrode conductor is run from the service to the building steel. 200' from this point we bonded the metal water pipe to the building steel. All condutors are sized per 250.66. The inspector is requiring a grounding electrode conductor be installed the entire 200' to the waterpipe. The building is bolted together with no expansion joints.

The inspector is stating that there is no way to know for sure that the building steel has an effective ground path. My stand is that the bonding jumper to the water pipe assures and creates an effective ground path per 250.52(A)(2) even if it is 200' away.

I have read extensive threads on this subject but would like to know in everybodys opinion who is correct?

This isn't the first time this has come up.
 

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
The code is very clear about this.

250.52 Grounding Electrodes.
(A) Electrodes Permitted for Grounding.
(1) Metal Underground Water Pipe.

(2) Metal Frame of the Building or Structure. The metal
frame of the building or structure, where any of the following
methods are used to make an earth connection:
(1) 3.0 m (10 ft) or more of a single structural metal member
in direct contact with the earth or encased in concrete
that is in direct contact with the earth
(2) The structural metal frame is bonded to one or more of
the grounding electrodes as defined in 250.52(A)(1),

(A)(3), or (A)(4)
 

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
I agree with you. The installation as described is compliant. Since when is the steel frame of a building comprised of isolated pieces of steel?
 
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