According to the underwriter lightning suppression course I took the proper way
is to run as long a length of bare copper wire in the ground. giving the strike
as much area to dissipate as possible. Also cad welding the wire to a 10 ft
ground rod every 50 to 100 feet is highly recommended. And not to change the
subject but can i get an opinion for this weekends 160 contest? I have a
customer with a 180ft support I can use to hold up an antenna. Should i put
up an inverted v or a vertical with 4 ground radials 135 ft long. the feed
point will be 50 ft above the ground. Thanks.
John J. Nistico
911 Electric Inc.
516.356.6071
> From: K1TTT@ARRL.NET
> To: towertalk@contesting.com
> Date: Wed, 23 Jan 2013 00:24:53 +0000
> Subject: Re: [TowerTalk] bonding to AC power box or inside fuse panel?
>
> Yeah, but radial wires start to lose effectiveness for dissipating lightning
> past about 50' or so. You would be better off to take that 175' and cut it
> in 3 or 4 pieces and lay them out like radials under the tower.
>
> The connection between my towers and the shack ground system consists of
> 100' to 500' lengths of guy wire or aircraft cable holding up the multiple
> runs of hardline going to each tower or remote antenna. I agree that the
> shield(s) of the hardline is probably a much better equalizer than a buried
> wire over those distances.
>
>
> David Robbins K1TTT
> e-mail: mailto:k1ttt@arrl.net
> web: http://wiki.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://k1ttt.net
>
>
> -----Original Message-----
> From: john nistico [mailto:electric911inc@hotmail.com]
> Sent: Wednesday, January 23, 2013 00:11
> To: Vincent Weal; wc1m73@gmail.com
> Cc: towertalk@contesting.com
> Subject: Re: [TowerTalk] bonding to AC power box or inside fuse panel?
>
> When it comes to lightning protection more is better. If the 1/0 copper wire
> was bare in the trench it would dissipate a lightning strike much better.
> This is what we do on houses all the time.
>
>
>
>
> John J. Nistico
> 911 Electric Inc.
> 516.356.6071
>
>
> > Date: Tue, 22 Jan 2013 17:37:34 -0500
> > From: k4jc@arrl.net
> > To: wc1m73@gmail.com
> > CC: towertalk@contesting.com
> > Subject: Re: [TowerTalk] bonding to AC power box or inside fuse panel?
> >
> > Dick, I want to thank you for this post. I have been trying to find an
> > answer to this question for years, but no one seemed to have a
> > definitive answer. Can you tell me where I can find the article you
> referred to?
> >
> > My tower is going to be 175 feet from the shack and I wasn't looking
> > forward to dropping all that dough on grounding wire!
> >
> > 73, Vince K4JC
> >
> > > -----Original Message-----
> > >"Another example is bonding the tower ground to the single-point
> > >ground at
> > the house. My first tower farm is 265' from the house. Being new to
> > tower construction, I laid 265 feet of 1/0 ground wire in the trench
> > running between the two locations in order to bond the ground systems.
> > This was not cheap, to say the least (though it was before the big run
> > up in copper
> > prices.) Later, I read an article by Polyphaser that said if the
> > ground systems are more than 75' apart it does no good to bond them --
> > the wire inductance will be too high to make an effective connection.
> > With this in mind, when I installed my second tower system in a different
> location 220'
> > from the house, I did not run a separate ground wire. The Polyphaser
> > argument made sense to me. Also, there are two runs of 1-5/8" hardline
> > in the trench, and the gigantic copper shields on those babies surely
> > provide a lower inductance path between the tower and house than a 1/0
> > wire would
> > -- if, in fact, any wire has low enough inductance at that length to
> > be effective.
> >
> > 73, Dick WC1M"
> > _______________________________________________
> >
> >
> >
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> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
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