This grounding stuff really energizes people (no pun, groan).
I have read many, many write-ups on this, and the best I have seen are those
offered by Polyphaser and Alpha-Delta. Both of these reputable companies,
and several engineers whose write-ups I have read, insist that all ground
points be tied together.
The principle is this:
If all points are tied together, then they will all rise together, to a
common high voltage during the strike event. If they are all at a common
voltage, then there is no delta VS.. If there is no delta VS., then no
current will flow, and nothing will cook.
I cannot PROVE that this is correct, but it makes sense to me, and it is
what I do here at my place.
By the way, the underwriters code requires all grounds to be tied together
also, If I have read the code correctly.
Your mileage may vary.
73 de Gary, AA2IZ
----- Original Message -----
From: "K Van Horn" <W7SV@sbcglobal.net>
Sent: Tuesday, August 12, 2003 11:59 AM
Subject: Re: [TenTec] Another grounding question
> Dear Ed and Janet,
> Do not EVER tie them together! When lightning strikes your tower, and it
> WILL, you will have upwards of 100000 volts destroying every electrical
> device in your home from the ground lead of your electrical system during
> the 15 -50 milliseconds that it takes for the voltage to bleed off into
> ground system!! Many textbooks recommend tieing these together, but they
> in ERROR!! Save yourself a lot of money and more trouble than you can
> If you tie them together and you take a strike, the following is a list of
> what you can expect to replace:
> (even if they are turned off at the time of the strike because the voltage
> is so high that it jumps the switches)
> Air Conditioner (inside and outside unit)
> Television sets
> Can Openers
> Clock Radios
> Light Bulbs
> Stereo Amplifier and Receiver
> Garage door opener
> Security System
> All in all, over $20,000 in damage on two strikes 6 days apart. Whereupon
> realized the error and cut the link out with a boltcutter and solved the
> ----- Original Message -----
> From: "Ed and Janet" <firstname.lastname@example.org>
> To: <email@example.com>
> Sent: Monday, August 11, 2003 12:37 PM
> Subject: [TenTec] Another grounding question
> What is the thinking on grounding the tower ground to the ground coming
> the house at the power, 220 service entrance? Tie them together or not?
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