At 12:17 PM 1/21/2007, Cqtestk4xs@aol.com wrote:
>Thanks to all who responded to my question about ground rods in rocky soil.
>UFERs seemed to be highly recommended.
>I may be able to use something like that. The tower is about 400 feet away
>from the house and will probably be grounded in the traditional way enhanced
>with radials. However, the entry point at the house may be able to use the
>UFERs, although am not sure if what I'm using would qualify as UFERs.
>Most houses in Hawaii are built on a post and pier system, using a system of
>shear walls on footers.
One of the Ufer style grounds described in a paper by Phillip
Rowland, "Industrial System Grounding for Static, Lightning, and
Instrumentation, Practical Applications", in IEEE Trans on Industry
Apps, Vol 31, #6, Nov /Dec 1995, p1358-1362 is lots of concrete piers
connected together (as used to support a steel frame building, for instance.
So, your piers probably have rebar in them.. if they are tied to the
bolts? Actually, interestingly, for a Ufer type ground, all the
metal doesn't have to be connected. Just there has to be at least 20
ft total. The idea is that it provides a relatively high
conductivity path within the concrete. So you might be able to just
use lugs on the attachment bolts.
>At the entrance point to the house for all the
>radio cable, telco and power will be an L-shaped footer about
>14 feet long with
>rebar in it. My plan, in addition to using as many radials and the
>the electrician will install, is to tie into that footer and any other
>footers within about 20 feet or so to help enhance the ground system.
>would have rebar and would be about 18 inches wide by about one foot deep
>and would be roughly 14-16 feet long. Soil would be backfilled to
>top of the footer, but not covering it
>Any thoughts as to whether I should tie into the footer system. What
>improvement would there be, if any?
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