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Re: [TowerTalk] Grounding base slab and pier tower bases

To: Christopher J Galbraith <>,
Subject: Re: [TowerTalk] Grounding base slab and pier tower bases
From: Nick Pair <>
Date: Mon, 3 Jul 2006 10:44:29 -0700 (PDT)
List-post: <>
Hello Chris,
  Yes I could with the cravat that you MUST provide a low impedance ground path 
to building ground and a lightning ground system.This path must be direct as 
possible and all bends radiused with at least a 6" radius. Roof installations 
are particularly hard to protect without a much larger expenditure for funds in 
copper! Roof cell sites are usually fed with a 4/0 cu wire to a ground grid at 
earth level. That being said you have to live with what you have sometimes. 
  With a reasonable ground a device similar to the Nott Ltd. GS-1 
( .html), Ericson Broadcast Sales SC-1 or SC-3(or several 
( or home built like will 
reduce your strike chance by 95% or so. The last 5% is due to the fact that 
sometimes the charge builds up faster than can be bled off with the discharge 
array you have. I have also built devices by using 3/8 to 1/2 inch stainless 
steel cable one foot long in a compression one hole lug connector (or crimp if 
you have access to large enough crimper) on a U-bolt with galvanized or ss 
saddle on the tower leg. You fray out the cable to create the largest area of 
points you can. Which ever one you choose, try to place it higher than all 
antennae. If you must use a rotating member to do this , use a #6 or better 
insulated wire to the device and to the nearest tower leg with minimum for 
rotation. Similar metal clamps always.
  Of course YMMV
  Good Luck,
  Nick WB7PEK
Christopher J Galbraith <> wrote:
  Hi Nick,

Could you recommend a particular lightning discharge device? The
application is a 40 ft tower on top of a 50 ft building in a relatively
lightning prone area (SE Michigan).

Thanks and 73,

Chris KA8WFC

-----Original Message-----


If you lived in a more lightning prone area I'd recommend a lightning
discharge device for the tower top. They do a good job of keeping the tower
potential below where a leader arc can be created preventing a strike from
occurring to the tower and a radius equal to the height around it.


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