Common GEC copper bus bar 250.30A(6)a

[CustomElectricLLC]

I commonly find warehouse spaces with switchgear in an electrical room have a copper bus bar with the GEC, bldg steel, and other bonding wires landed on that bus bar (outside the service enclosure on the wall). Im installing a 2500A service in a similar warehouse setup and wanted to do a common grounding electrode as well. I have rebar which serves as the main bldg GEC, building steel bond, gas bond, water bond, riser sprinkler bond, and xfmr GEC in same room per articles I mentioned does anyone see any potential issues of such an installation granted that the GEC taps are connected to the bus bar with listed methods for grounding and bonding? Another article that I believe supports this installation is 250.64 F. Thank you

 

[infinity]

That's how we do it all of the time in large buildings. Typically the bus bar goes near the service and the GEC's run out to the various locations from there.

 

[tom baker]

The nec allows a grounding bus bar, its the cleanest install, and easy to do over having 3 or 4 gecs going into panel. And it gives you the intersystem bond that is required.
I used 1 hole crimp on lugs with 1/4" ss hardware to attach to grounding bus bar. Later i can post a picture.

 

[infinity]

1

 

[CustomElectricLLC]

The nec allows a grounding bus bar, its the cleanest install, and easy to do over having 3 or 4 gecs going into panel. And it gives you the intersystem bond that is required.
I used 1 hole crimp on lugs with 1/4" ss hardware to attach to grounding bus bar. Later i can post a picture.

I think that as long as crimp on lugs are used then the installation will comply with code. Besides you can’t use a mechanical lugs on a gec, as it has to be irreversible per code. At least that’s what I’ve read. I guess my question is, if your gec from your main electrode (Rods, plate, rebar, etc) lands onto that ground bus bar the the wire that goes from the bus bar to the service is what? A bonding jumper? A splice or continuation of the GEC?


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[CustomElectricLLC]

Here's our setup from my current project.

Are you guys bonding one side of that metallic raceway? And are you guys using crimp on lugs that then bolt to the bus?


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[infinity]

Are you guys bonding one side of that metallic raceway? And are you guys using crimp on lugs that then bolt to the bus?

Yes if you look closely at the photo you can see a grounding hub on the end of the raceway to the left. We use hubs on both end of the metallic raceway. Also the crimp on lugs that are being used are visible on the ground bus.

 

[david]

I think that as long as crimp on lugs are used then the installation will comply with code. Besides you can’t use a mechanical lugs on a gec, as it has to be irreversible per code. At least that’s what I’ve read. I guess my question is, if your gec from your main electrode (Rods, plate, rebar, etc) lands onto that ground bus bar the the wire that goes from the bus bar to the service is what? A bonding jumper? A splice or continuation of the GEC?


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Where did you read the lug is required to be irreversible ?

 

[roger]

Where did you read the lug is required to be irreversible ?

I second that question.

Roger

 

[tom baker]

Yes if you look closely at the photo you can see a grounding hub on the end of the raceway to the left. We use hubs on both end of the metallic raceway. Also the crimp on lugs that are being used are visible on the ground bus.

Yes and those are two hole NEMA lugs, they are better than single hole as they don't twist

 

[tom baker]

I think that as long as crimp on lugs are used then the installation will comply with code. Besides you can’t use a mechanical lugs on a gec, as it has to be irreversible per code. At least that’s what I’ve read. I guess my question is, if your gec from your main electrode (Rods, plate, rebar, etc) lands onto that ground bus bar the the wire that goes from the bus bar to the service is what? A bonding jumper? A splice or continuation of the GEC?


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Busbars are allowed, please read 250.64, to answer your questions