Marble and granite were commonly used as insulators in large
instrument/control panel in power stations is the past. I question that a rod
drilled into bedrock or a large rock could be considered "well grounded".
Go Ufer go! (I used 9 grounding rod for my tower, though. Didn't know better.)
Hans - N2JFS
-----Original Message-----
From: Ken <wa8jxm@gmail.com>
To: Mickey Baker <n4mb@arrl.net>
Cc: towertalk <towertalk@contesting.com>
Sent: Sun, Jan 18, 2015 11:43 pm
Subject: Re: [TowerTalk] w7ekb & ground rods
Would grout provide an adequate electrical path to the rock ground? Does the
rock itself provide an electrical ground?
Ken
> On Jan 18, 2015, at 11:05 PM, Mickey Baker <n4mb@arrl.net> wrote:
>
> The solution was to
> deploy a construction crew with a 48" x 1 1/4" hammer drill bit, to drill
> two holes to a depth of 48" and attempt to drive the rod beyond that. If
> that worked, the hole was grouted shut around the rod. If it didn't work,
> the rod was to be cut to 48" and each end grouted into the two holes, both
> connected to the booth with #6 solid copper.
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