Concrete-Encased Electrode.

[tcook99]

How can I get an official interpellation of 250.66(B) as the sole means for grounding for a service over 3/0. From NFPA. This is a 400 amp service sized per 310.15(B)(6). New construction with no other means available per 250.50.
Single family dwelling. I need something official from NFPA.

 

[frizbeedog]

I need something official from NFPA.

I think the codebook, NFPA 70, is official.

:smile:

 

[walkerj]

This isn't official:grin:

The ufer doesn't require a supplemental electrode.

Only Metal water piping needs the ground rod.

 

[George Stolz]

I need something official from NFPA.

Why? The code is pretty clear on this - a GEC to a CEE does not have to be larger than a #4 CU.

 

[infinity]

Good luck with an official NFPA document. If the CEE is the only electrode present than that's the only one required. #4 CU is also the largest conductor required to a CEE. 250.66(B).

 

[roger]

Good luck with an official NFPA document. If the CEE is the only electrode present than that's the only one required. #4 CU is also the largest conductor required to a CEE. 250.66(B).

I agree with the others, a CEE can be a sole electrode and it only needs to be connected by a #4 conductor.

Roger

 

[infinity]

I would add one other thing, that if the footing didn't contain 1/2" or larger rebar no CEE would be required. Then you could just use 2 ground rods.