Hello all,
My earth ground rods are not interconnected and completely impractical to do
so. Shack is grounded to a single rod about 25 ft away through 4 gauge wire.
Would it be better to just remove it from equipment in the shack. Leave all
ungrounded???
Thanks, Pepe WP3HW
On Sep 14, 2011, at 10:55 AM, Joseph or Ruth Patrick wrote:
Thanks Jim
I will definitely have to investigate series mode protection. First the house
system and when the budget allows the rest. Thank you again for your time and
knowledge.
73 DE K4XZ Joe Patrick
God Made Man
Sam Colt Made Them Equal
________________________________
From: Jim Brown <k9yc@audiosystemsgroup.com>
To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Sent: Wed, September 14, 2011 3:28:32 AM
Subject: Re: [TenTec] Earth those feeders
Hi Joe,
Yes, the AC power line is a common entry point. I agree that a good
whole house protector at the main feed is a good thing. I've bought one,
but haven't installed it yet. It is critical that the leads between the
protector, the power line, and the green wire be VERY short. It is also
critical that everything in your premises be bonded properly.
Earth connections are not SOURCES of trouble (unless they are not
properly bonded together), so they do not require protection. The lines
that need protection are all signal and control lines that enter your
premises, like CATV, telephone, and antennas. Again, it is critical that
protectors be properly bonded to the ground system.
You should absolutely avoid shunt mode (MOV) surge protection on branch
circuits (the sort of things built into outlet strips, and most
dedicated surge protectors). MOVs on branch circuits are more likely to
CAUSE damage than to prevent it. MOVs are entirely appropriate at the
service entrance if they are properly bonded. The ONLY safe protection
for branch circuits are SERIES MODE protection devices. I use and
recommend SurgeX products. Yes, I have done consulting for them --
teaching, technical writing, and some of their more difficult tech
support troubleshooting -- but I was specifying them for ten years
before they hired me for anything. :)
73, Jim Brown K9YC
On 9/13/2011 2:38 PM, Joseph or Ruth Patrick wrote:
> Good Afternoon Jim
> Excellent description of the NEC. Recently I had a near lightning
> strike. My tower and ground system is set up per the nec as a single
> point ground system. The strike took out 1 radio, 1 printer, a
> Signalink USB interface, and a ceiling fan speed control in another
> room. After much discussion with people much more knowledgeable than
> myself it was determined that the spike entered thru the main AC feed.
> I have decided to install a surge suppressor at the main feed. My
> question is what about the ground line where it enters the shack.
> Does this need protection or disconnection also? I am not an EE or an
> electrician. I do have knowledge of the the NEC as it is adopted in my
> municipality. I would appreciate your thoughts on this if you have
> some time. Thank you in advance.
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