How many concrete encased electrodes?

[ga77]

Is one concrete encased electrode sufficient or do ALL concrete encased electrodes that are installed need to be bonded to the grounding electrode conductor (GEC)?

 

[George Stolz]

Re: How many concrete encased electrodes?

I'd say 250.50 is requiring all grounding electrodes present to be used. How does a structure end up with several of these?

 

[ga77]

Re: How many concrete encased electrodes?

Originally posted by georgestolz:
I'd say 250.50 is requiring all grounding electrodes present to be used. How does a structure end up with several of these?

Footings for interior structural columns may be isolated from the perimeter foundation and could possibly contain 20' of rebar (greater than 5'square).

 

[George Stolz]

Re: How many concrete encased electrodes?

I wouldn't bother with the columns. I can't imagine an AHJ viewing it as seperate CEE's. IMO.

 

[benaround]

Re: How many concrete encased electrodes?

Any isolated item (i.e.)column,can be bonded to any portion of the Grounding System via a bonding jumper. One CCE meets NEC.

frank