Ray:
We've been using this interpretation for years.
William Miller
At 01:26 PM 3/13/2010, you wrote:
Actually my read of 2008 code should allow the pole to qualify as the
grounding electrode:
690.47 (D) allows the mounting structure to be the electrode if it
meets 250.52.
250.52(A.7) plate electrode says you need at least 2 sq. ft of 1/4" steel
plate.
A 6" diam pipe 4 ft in the ground, will have 6.8 sq. ft of surface area......
A 4" diam pole will have 4.7 sq ft of surface area.....
Anybody see a flaw in this logic?
R. Walters
r...@solarray.com
Solar Engineer
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