[RE-wrenches] ground

[Ray Walters]

I've also used 250.52A(7) defining plate electrodes. A 6" Sch 40 pipe 4 
ft in the ground has more than the required 2 sq ft of surface metal, 
and is at least the required 1/4" thickness.
Also, the 2011 NEC dropped 690.47 D which required a grounding electrode 
at the array. Are you sure you still need this? I believe 2011 only 
requires you bond all the metal to the EGC, as always.

Ray Walters

On 9/30/2011 8:24 AM, Kent Osterberg wrote:
> The requirements listed in 250.52(3) were changed in 2011. The rebar 
> used is allowed to be near the bottom of the footing or in vertical 
> foundation walls that are in direct contact with earth. If there was 
> in doubt in the past that the rebar in the concrete of a pole mount 
> was a suitable grounding electrode, the changes in 2011 should remove it.
>
> Kent Osterberg
> Blue Mountain Solar, Inc.
>
> Richard L Ratico wrote:
>> As Dan points out, 250.52(A)(3) specifies several installation 
>> requirements in
>> order for a concrete encased electode to qualify as a permitted 
>> Grounding
>> Electrode. A pole mount foundation would certainly qualify if it met 
>> those
>> requirements.
>>
>> Even if the requirements are not met, IMHO, any opportunity to 
>> inexpensively
>> increase the grounding integrity of a system should not be overlooked,
>> particularly in lightning country. Of course, a code compliant Grounding
>> Electrode System is still required. Bonding a non compliant, but 
>> never the less,
>> very substantial additional "electrode" to that system would not hurt 
>> anything
>> and quite possibly help considerably.
>> Dick Ratico
>> Solarwind Electric
>> _______________________________________________
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