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Re: [TowerTalk] Tower grounding

To: David Gilbert <xdavid@cis-broadband.com>
Subject: Re: [TowerTalk] Tower grounding
From: "Steven H Sawyers (na0ia)" <steve@sawyers.org>
Date: Wed, 17 Jul 2013 21:40:58 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
ACI code requires the concrete to have a minimum of 3" of "cover" concrete whether between the rebar and the outside world - either the concrete form or the ground. This "cover" allows the full strength of the rebar to be utilized in the structure.

Steve NA0IA

At 08:55 PM 7/17/2013, David Gilbert wrote:

Your hysterics aside, almost all of that is patently false, and in most locations is directly contrary to code. You really need to study what a Ufer ground is and why they work.

By the way, this same old wives tale comes up every so often here and on other forums, and each time it does I spend about a half hour doing Google searches to find any documented instances of a block of concrete exploding because of steam expansion from a lightning strike. I have found TONS of discussion and endless repetitions of the same old exhortation you just made, but not a single first hand account of exploding concrete due to steam. Concrete is quite brittle and fractures easily, and I could far better imagine that the intense thermal shock generated by a lightning hit would instead be the culprit. I have indeed witnessed first hand a lightning strike blasting a chunk out of solid granite rock alongside the road I was driving on (scared the hell out of me), and I guarantee that rock was dry as a bone.

Dave   AB7E




On 7/17/2013 9:18 AM, Skip K3CC wrote:
I'm not sure I understand the thread however,  NEVER EVER, ground anything
into the concrete base !!!!!!!    NEVER use any ground rods in concrete !!!!

If you would get a lightening strike, the current would carry into the concrete
and boil off the water.  When this happens the concrete will explode !!!

de Skip K3CC _______________________________________________

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