On 8/8/15 12:38 PM, Thomas Noel wrote:
I suspect the important aspect is the surface area interfacing with soil, not the
volume of dirt under or surrounding the grounding system. That 6x6x6 cube has far more
surface area in contact with the soil than does even a dozen ground rods and a radial
field. Even if you compare just the surface area of the bonded rebar in the concrete,
it is probably more surface area for transfer. I’ve never heard of a tower base
exploding from the energy of a strike. Has anyone?
Thomas W Noel
KF7RSF
There is a much cited photograph of concrete spalling at the base of a
ski-lift tower in the Rockies. However, it turns out that in that case,
the bolts in the concrete had rusted, so it's not representative of a
Ufer ground.
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