[TowerTalk] Fwd: w7ekb & ground rods

[Hans Hammarquist via TowerTalk]

 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 at gmail.com>
To: Mickey Baker <n4mb at arrl.net>
Cc: towertalk <towertalk at 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 at 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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