[TowerTalk] Lightning protection grounding

[Dave Jordan]

<3717319D.DFE23C18@erols.com> <199904161807.LAA17332@toontown.mmsi.com>
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Eric,

SURE...but we're not talking about solving the concern but perhaps
reducing
some of the volunerabilities that might cause damage to the cables, etc.
I plan to install a static discharge device for the top of the tower, run
the down
lead to the ground grid and forget about it. I don't see any other
options other
than installing a non-crank-up tower. Do YOU ?

Eric Gustafson wrote:

> >Date: Fri, 16 Apr 1999 08:48:29 -0400
> >From: Dave Jordan <wa3gin@erols.com>
> >
> >Why can't a person simply run a ground wire from the top
> >section/mast of the crank-up down along with the coax and
> >terminate the wire to the ground system at the base?
> >
> >===================
>
> You _can_ do that.  But until the surface area of the ground wire
> and coax shield are larger than the surface area of the tower
> structure, the tower will still be carrying the majority of the
> stroke current.
>
> 73, Eric  N7CL
>
> >
> >Bob Wanderer wrote:
> >
> >> The conductor running down the inside of the tower to ground
> >> is unnecessary. It carries maybe 10~15% of the total current.
> >>
> >> However, there is higher resistance between two sections of a
> >> crankup which could benefit from straping the two sectiuons
> >> with copper strap. The problem is then how do you crank the
> >> tower down? If you make the straps long enough to allow crank
> >> down, they will flap in the wind. Making them short jumpers
> >> obviates the convenience of the crankup. I guess you have to
> >> decide which situation is the more tolerable.
> >>
> >> 73,
> >> Bob AA0CY
> >>
> >> ----------
> >> From:  David Leikis[SMTP:dlleikis@deseretonline.com]
> >> Sent:  Sunday, April 11, 1999 9:40 PM
> >> To:  towertalk
> >> Subject:  [TowerTalk] Lightning protection grounding
> >>
> >> Hello,
> >>
> >> I have seen many recent postings concerning grounding methods
> >> and saw one that stated to run a ground conductor up the mast
> >> to the final section (and the others as well) to prevent any
> >> high resistance points along the way through the joints.
> >>
> >> My question is this: I am erecting a self-supporting crankup
> >> and am concerned about the sliding joints of the installation.
> >> It seems as though these would definitely be high resistance

> >> and would need this more than any other.  What is a
> >> recommended method from those that may have done this before?
> >> We can have some pretty severe storms here and I am positive
> >> (or negative) that lightning charge dissipation should be
> >> 'high' on my list.
> >>
> >> Dave KG7EW
>
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