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- Path: sparky!uunet!dtix!darwin.sura.net!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!telecom-request
- From: rgt@beta.lanl.gov (Richard Thomsen)
- Newsgroups: comp.dcom.telecom
- Subject: Lightning Protection on Telephone Lines
- Message-ID: <telecom12.850.4@eecs.nwu.edu>
- Date: 15 Nov 92 16:58:58 GMT
- Sender: Telecom@eecs.nwu.edu
- Organization: TELECOM Digest
- Lines: 56
- Approved: Telecom@eecs.nwu.edu
- X-Submissions-To: telecom@eecs.nwu.edu
- X-Administrivia-To: telecom-request@eecs.nwu.edu
- X-Telecom-Digest: Volume 12, Issue 850, Message 4 of 13
-
- I live in the mountains, where lightning and my location are
- synonymous. I have lost telephone equipment several times. Once,
- about three feet of my telephone cord exploded, separating the wires
- in the modular cable, and removing the copper in one wire. (It arced
- to my X-10 controller, which did not do so well with the arc. There
- was a black spot inside where the circuit board said "F1" should be :-)).
-
- A second time, I woke up in the middle of the night to see sparks
- comming out of the base of my cordless telephone. I unplugged the
- telephone line, but the thing never worked again.
-
- Last summer, I got a modem line protector along with a surge protector
- for my computer. When I went to use the telephone in it, it did not
- work. Checking inside, I found that the wires in the modular jack are
- melted, when it apparently arced to the metal frame. The telephone
- cord from the wall jack to the protector no longer works, and is
- burned on both ends.
-
- Needless to say, I cannot leave modems, answering machines, cordless
- telephones, or any other sensitive electronic equipment connected to
- the lines. But I have not lost anything on the regular electrical
- system, only when it interfaced to the telephone lines.
-
- It seems to be arcing between the telephone lines and the electrical
- system. The telephones themselves are not hurt, unless they are
- plugged into the house wiring or touching something that is plugged
- in.
-
- I got some gas discharge tubes from Radio Shack and put them on the
- telephone line outside (both sides to ground), but that was a few
- years ago, so they do not seem to have done much good. Last weekend,
- I wired the telephone ground line outside to the electrical ground
- outside (the copper rod driven into the ground just under the
- electricity meter), and I hope that this will help some.
-
- Does anyone know where I can get some *good* gas discharge tubes or
- any other suggestions for protecting my telephone wiring? I live in
- Contel (now GTE) area, so I am not sure how much good it would do to
- call them. Other people in my area have come home to find pieces of
- telephone all over their living room, so this is not an isolated
- situation up here.
-
- I have been thinking of mounting a box outside next to the telephone
- line, wiring the line to a terminal strip. I would then mount sharp,
- pointed wires making an air gap to the contacts, hoping that the
- lightning would arc over that, if the gas discharge tubes could not
- handle it. I would also put MOVs on it.
-
- Also, how do you test gas discharge tubes and/or MOVs to see if they
- are still good?
-
- Any suggestions?
-
-
- Richard Thomsen rgt@lanl.gov
-