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From: hes@ecsvax.UUCP (Henry Schaffer)
Newsgroups: net.ham-radio
Subject: Re: MOV transient protectors
Message-ID: <764@ecsvax.UUCP>
Date: Tue, 26-Feb-85 09:36:41 EST
Article-I.D.: ecsvax.764
Posted: Tue Feb 26 09:36:41 1985
Date-Received: Fri, 1-Mar-85 07:33:54 EST
References: <8582@brl-tgr.ARPA>
Organization: NC State Univ.
Lines: 17

Re: protecting your house from lightning carried on the
incoming power lines.
1)Most homes around here have 3 line, single phase 120/240
service.  All three lines should be protected- taking 3 MOVs
or ONE three-electrode gas tube.  When the gas tube is fired
(due to voltage on any pair of lines) it "shorts" all three
lines together.
2)At the entrance to the house wiring the power lines can
indeed supply lots of power and so the protection device must
be able to pass lots of current and dissipate lots of power.
Once again a gas tube fits the description.
  A company I've dealt with (through a distributor) which makes
a variety of gas tube surge protectors is TII (I don't remember
what it stands for, and I can't find my catalog.)  An example of
a home lightening surge protector (from a 6 year old spec sheet):
Three wire, maximum discharge voltage: 450V@500AMP, 800V@1,000AMP
2 1/2" x 2 1/2" x 1 3/8" + 1/2" threaded nipple  $21.54.