[Top] [All Lists]

Re: [TowerTalk] tower ground question

To: "Roger (K8RI)" <>
Subject: Re: [TowerTalk] tower ground question
From: David Gilbert <>
Date: Thu, 29 May 2008 11:15:54 -0700
List-post: <">>
I've never understood that comment either.  I fully agree that rebar or 
anything made of steel will rust and the rust will propagate along the 
rebar into the concrete, but copper doesn't do that.  Some people here 
have previously expressed concerns that differential expansion and 
contraction between copper and concrete would allow a microgap to form 
between wire and concrete and allow water to penetrate to the attached 
rebar or tower base, but that ignores the fact that there is already a 
microgap between the tower base and the concrete and that concrete is 
fundamentally porous to moisture anyway.

So why is it bad practice to bring a copper conductor out through the 
concrete?  The copper ground wire for the Ufer ground of a house 
typically comes out of the concrete footing underground.

Dave  AB7E

Roger (K8RI) wrote:
> Also there is the problem of conductors coming out through the side of 
> the concrete with is considered bad practice.

TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>