Bonding of Steel building with Multiple Services

Merry Christmas

LeeCT1

Member
I am involved in a large steel building utilizing (3) 3000A Owner owned 13.800 to 480V transformer services. I had a question in reference to the G&B of the services. In article 250.58, and I have looked at what Mike has said in his books and also in his video of the 2017 code, that we need to use a common grounding electrode, yet also using a common ground could put neutral voltage on the steel building. So there are a few questions. First is which is correct? 2nd, if I run to the water pipe with one service, can I use building steel as a conductor to the other two services? There would be a bonding jumper at the building expansion joint. And all other grounding was pretty clear cut. I have tried to research this but do need some input. Thank you all for your time.
 

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
Iirc, you can use bldg steel as a bonding conductor but not as a gec.

I am not sure you actually have three services. You may have three sets of service conductors.
 
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