an oops in editing - I should have said "reduces the point to point
resistance" in paragraph 2.
Grant KZ1W
On 6/26/2017 21:30 PM, Grant Saviers wrote:
.snip..
As a composite material then consider how the rebar matrix reduces the
point to point conductivity much more. (I'll leave it to others to
figure that out). Then consider how much area is in a Ufer foundation
in contact with earth. In my case, about 250 sq ft for a tower base
and 720 sq ft for a foundation. Both are wet year round. Compare to a
10' 5/8" ground rod at 1.6 sq ft of area. So the relative current
density at the earth interface is 2+ orders of magnitude less for my
tower base, assuming the current is uniformly distributed by the rebar
matrix (which it isn't since rebar has inductance, but there is a lot
in parallel).
..snip..
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