|[Boatanchors] RE: [AMRadio] Tower Construction|
garyschafer at comcast.net
Tue Jun 13 21:57:06 EDT 2006
You need more than one ground rod for a lightning ground unless you are
going to completely disconnect everything from the shack.
> I appreciate all the email on this subject.
> Interestingly, when lightning rods were placed on barns all over this
> country, I cannot recall any barn in our region ever catching on fire
> because of a lightning strike. I am sure that it did happen in other
> regions, particularly, in the Midwest/ The installation was to run a
> large conductor cable from the lightning rod to the ground. There were
> generally two rods on either end of the roof. I would theorize that a
> lightning strike should be directed to a ground rod placed a few feet from
> the tower rather than to travel under the base of the tower as some have
> suggested. I am going to ground the tower at the three legs with a copper
> strap and then to a ground rod about 3 feet from the tower.
> Also, the Empire State Building and other skyscrapers get struck many
> during a thunder storm and I wonder if anyone knows if the lightning
> through the superstructure or through cables/straps to the base of the
> building and through ground rods.
> Dave, W3ST
> Publisher of the Collins Journal
> Secretary to the Collins Radio Association
> www.collinsra.com - the CRA Website
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> CRA Nets: 3805 Khz every Monday at 8 PM EST
> and 14255 every Saturday at 12 Noon EST
> ----- Original Message -----
> From: "Gary Schafer" <garyschafer at comcast.net>
> To: "'Stevan A. White'" <w5saw at pathwayz.com>; "'Discussion of AM Radio'"
> <amradio at mailman.qth.net>; <boatanchors at mailman.qth.net>
> Sent: Monday, June 12, 2006 10:10 PM
> Subject: [Boatanchors] RE: [AMRadio] Tower Construction
> > Be careful when giving this advice.
> > A UFER ground is a good SUPLEMENTAL ground in a tower base but it should
> > not
> > be the only ground. A large area like a floor of a building provides
> > surface for the lightning to dissipate. A tower concrete foundation may
> > not
> > be large enough by itself and there is the possibility of poor
> > inside so that the concrete crack from a lightning strike if it is the
> > only
> > ground connection. It is always recommended that ground rods be attached
> > to
> > each tower leg in addition.
> > 73
> > Gary K4FMX
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