[TowerTalk] Lightening

[Grant Saviers]

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..