I faced a similar problem -- long path around the house to the service panel
(>150 feet and crossing a driveway), but a relatively short run through the
house (<50 feet). I connected a run of 1/0 copper ground wire between the
single-point ground and the service panel.
73, Dick WC1M
> -----Original Message-----
> From: James C. Garland [mailto:4cx250b@muohio.edu]
> Sent: Sunday, June 10, 2007 12:16 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Single Point Ground
>
> Dave,
>
> My QTH has the service entrance to the house located immediately
> adjacent to
> the exterior coax entrance panel outside my station wall. All grounds,
> including the house 240V service ground, the rebar cage for the house
> foundation, the ground system of the tower (about 130 ft distant), and
> each
> of my three operating desks are tied together at that one point.
>
> The idea, of course, is that if lightning strikes the tower, all the
> grounds
> will rise together in voltage during the strike, and since they are all
> tied
> together at only one point, damaging strike-induced ground-loop
> currents
> cannot flow between different grounds.
>
> I don't see any problem with your routing your service ground indoors,
> provided your tie point is sufficiently well grounded to absorb
> currents
> flowing from your tower. The only reason to route the service ground
> outdoors to your tie point is if you think enough current would ever
> flow
> through the wire during a lightning strike to heat it up and set fire
> to the
> house. Since strike currents will come from the antenna and not the
> underground cable from the service transformer, that seems a rather
> remote
> possibililty.
>
> 73,
>
> Jim W8ZR
>
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Dave
> Sent: Sunday, June 10, 2007 8:27 AM
> To: towertalk@contesting.com
> Subject: [TowerTalk] Single Point Ground
>
> I am in the process of building my station at a new QTH and have a
> question
> about the single point ground.
> I will initially be installing a Steppir on a Trylon 70' tower which is
> about 170 feet from the proposed shack.
> The shack will be in a walkout basement room. The entry panel will be
> outside of this area.
> The house is serviced with underground power and phone. The nearest
> utility
> pole is about 800 feet away. (above ground)
> The utility power entry is located about 65 feet away on the opposite
> end of
> the house from the shack. The utility uses a UFER ground.
>
> How should I tie/route the utility ground to my single point ground.
> Does
> the tie wire need to be routed outside and buried or can it be run
> through
> the structure or a combination of the two? (concrete driveway and
> sidewalks
> in the way outside)
>
> Cheers, Dave - N7DRK
>
>
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