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Re: [TowerTalk] bonding to Rohn tower

To: towertalk@contesting.com
Subject: Re: [TowerTalk] bonding to Rohn tower
From: K4SAV <RadioIR@charter.net>
Date: Mon, 03 Aug 2009 00:29:47 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
R. Kevin Stover wrote:
> And this is why you don't attach copper anything, strap or wire, 
> directly to a galvanized (zinc) surface.
> Clamp some stainless sheet to the leg then clamp your strap or wire to 
> to the stainless.
>
> Scott MacKenzie wrote:
>   
>> One good reason is that copper is anodic to zinc and steel.  You will get
>> preferential corrosion of the zinc and eventually of the steel - eventually
>> corroding the steel until it is unable to support its weight.  At least that
>> is what I was thinking....
>>
>> Scott, AKA KB0FHP 
>>   
>>     
Yes, and so is stainless steel, and it can be even more anodic depending 
on the exact composition.  So how do you justify putting stainless steel 
next to the zinc?

And while I'm at it, I may as well throw out another unknown that bugs 
me.  Why is the industry recommended method of connecting lightning rods 
to use a rope-lay copper wire.  That is twisted such that individual 
strands take a dive into the center of the conductor very often.  That 
is very close to the way braid is made and should have the same high 
impedance properties at RF frequencies once the strands obtain a little 
corrosion.

Jerry, K4SAV

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