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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