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- Path: hal.COM!elvey
- From: elvey@hal.COM (Dwight Elvey)
- Newsgroups: comp.dcom.modems
- Subject: Re: Lightening protection
- Date: 3 Apr 1996 20:43:33 GMT
- Organization: HAL Computer Systems, Inc.
- Distribution: world
- Message-ID: <4juntl$2dj@news.hal.com>
- References: <MODEMS-L%96032606062588@VM.ITS.RPI.EDU> <4jaqdq$d6o@news.sas.ab.ca>
- NNTP-Posting-Host: civic.hal.com
-
- In article <4jaqdq$d6o@news.sas.ab.ca>, karpo@freenet.edmonton.ab.ca () writes:
- |>
- |> This may sound strange but I've seen it work. Tie about 5 or 6 knots in
- |> your telephone cord. (between the modem and the jack) When the lighting
- |> hits it will get transfered through the knots and they seem to stop it.
- |> This will kill the cord but will save your modem.....
-
- Hi All
- This does about as much as putting salt shakers on to of
- your computer and doing a quick chant. Like I said, if you
- really have an application that requires continuous phone
- connection, such as a BBS. About the only thing, that is
- of reasonable use, would be to have a good phone line
- protector and use an isolation transformer with good
- high voltage seperation. When doing this it will
- work best if you also float the ground lead of the PC
- making the PC completely floating. When doing this, make
- sure that you don't use the PC while there is a lightning
- storm or you may be the path of the lightning strike.
- Actually, reguardless of how you connect things up, you
- should stay away from any piece of equipment that is
- connected to phone or power lines. People using phones
- during storms is one of the biggest lightning killers in
- the US.
- One last way of doing things that may not be to practical
- is to add a Faraday shield to the transformer isolated
- system. Make the Faraday shield out of two or three
- layers of 1/8 inch copper sheets. Completely surround
- the PC in each layer making box within box type of effect.
- At each layer put a lightning suppressor connected to
- the box layer and not to ground, for both the phone line
- and the power line. Each layer box should be isolated from
- the next layer out. Ground the outside layer to a good ground.
- This type of system will give good protection against most
- lightning and most EMP ( should such be a problem ).
- Dwight
-