grounding the building itself?

[misterfixit]

Finally getting to the point of (almost) ready to hook up electrical on my new detached shop. I have 4 wire running from the disconnect at the meter to my panel in the building. I understand the earth ground goes to the the Ufer or ground rod, but should it also be bonded to the steel framing of the building? The building is a weld up steel frame with metal siding.

 

[alfredeneuman]

. I understand the earth ground goes to the the Ufer or ground rod, but should it also be bonded to the steel framing of the building? The building is a weld up steel frame with metal siding.

Yes, building steel must be bonded

 

[ctgoodman]

I have a post frame building so mine is wood. I do have grounding rods though off of the sub panel in the building that is fed from the main panel in the house.


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[sberry]

You want the earth you ae standing on, any steel, all the machines in the whole place all connected to the 4th wire. Eliminate any potential difference between it all and a low impedance pathway for any fault back to the neutral main.

 

[acer66]

What would be the proper way to do that?

 

[sberry]

What would be the proper way to do that?

Bolt a lug to the steel and 8 for 100 or 6 to 200,, to the steel and to the ground bar. Bolt it somewhere it's visable. I use 6 anyway. I described it in another thread, just did one I bonded with a lug on the way to the rods. Use a bolt or threaded connection and not a self driller as I recall.

 

[acer66]

Bolt a lug to the steel and 8 for 100 or 6 to 200,, to the steel and to the ground bar. Bolt it somewhere it's visable.

That sounds easy enough, thank you.

 

[tonyprovo723]

For residential it may not matter, but thought I heard a #6 grd wire does not need to be in conduit while anything smaller does need to be in a protective raceway. This would explain why #6 is more common in commercial applications as a minimum size.(My observation for what is worth.)

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[sberry]

Ideally it should be the same or better than the 4th wire. I think on some service entrance (different than 4 wire) it should be a size larger.

 

[acer66]

For residential it may not matter, but thought I heard a #6 grd wire does not need to be in conduit while anything smaller does need to be in a protective raceway. This would explain why #6 is more common in commercial applications as a minimum size.(My observation for what is worth.)

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Same in residential.