Re: RS485 over optical fiber cable

From	upsidedown@downunder.com
Newsgroups	comp.arch.embedded
Subject	Re: RS485 over optical fiber cable
Message-ID	<9mpkud10gcssg288rnf3k47phtt0sr2njr@4ax.com> (permalink)
References	<pr9o50$m9b$1@dont-email.me> <7a4e710f-13b9-4105-9cee-113bbe81dae3@googlegroups.com>
Date	2018-11-13 08:09 +0200
Organization	Elisa Customer

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On Mon, 12 Nov 2018 19:57:18 -0800 (PST), peter jakacki
<peterjakacki@gmail.com> wrote:

>Isolation (solid-state) and 2-wire is better but over long distances you need lightning protection too, and I use combinations of transzorbs, ferrite beads, polyfuses, and miniature gas discharge tube protection and in these cases there is not a ground, but there is a very good earth.

In the context of lightning protection, what is a good earth ?

With two buildings with separate mains connections and individual
earthing electrodes, you do not even need a direct lightning hit, just
a hit to the mains leads and some arc suppressions to earth at mains
entry and you have several kA flowing into the earth. With earthing
resistance as low as 1 ohm, you will have a ground potential  bounce
of several kV in one building. I very much doubt that ordinary
isolation and some protection will handle this potential difference.

When connecting two buildings with individual earthing electrodes, I
would definitively use some fiber.

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RS485 over optical fiber cable pozz <pozzugno@gmail.com> - 2018-10-30 15:00 +0100
  Re: RS485 over optical fiber cable raimond.dragomir@gmail.com - 2018-10-30 07:26 -0700
    Re: RS485 over optical fiber cable pozz <pozzugno@gmail.com> - 2018-10-31 12:41 +0100
      Re: RS485 over optical fiber cable raimond.dragomir@gmail.com - 2018-10-31 05:55 -0700
      Re: RS485 over optical fiber cable Grant Edwards <invalid@invalid.invalid> - 2018-10-31 14:03 +0000
        Re: RS485 over optical fiber cable John Speth <johnspeth@yahoo.com> - 2018-10-31 09:35 -0700
          Re: RS485 over optical fiber cable Grant Edwards <invalid@invalid.invalid> - 2018-10-31 16:48 +0000
            Re: RS485 over optical fiber cable pozz <pozzugno@gmail.com> - 2018-11-02 14:44 +0100
              Re: RS485 over optical fiber cable Richard Damon <Richard@Damon-Family.org> - 2018-11-02 11:00 -0400
                Re: RS485 over optical fiber cable upsidedown@downunder.com - 2018-11-02 20:42 +0200
              Re: RS485 over optical fiber cable raimond.dragomir@gmail.com - 2018-11-02 08:18 -0700
              Re: RS485 over optical fiber cable Mike Perkins <spam@spam.com> - 2018-11-02 15:22 +0000
                Re: RS485 over optical fiber cable Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2018-11-02 21:31 +0200
                Re: RS485 over optical fiber cable Mike Perkins <spam@spam.com> - 2018-11-02 20:12 +0000
                Re: RS485 over optical fiber cable Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2018-11-02 23:57 +0100
                Re: RS485 over optical fiber cable upsidedown@downunder.com - 2018-11-03 01:18 +0200
                Re: RS485 over optical fiber cable Mike Perkins <spam@spam.com> - 2018-11-03 19:05 +0000
                Re: RS485 over optical fiber cable Richard Damon <Richard@Damon-Family.org> - 2018-11-03 17:36 -0400
                Re: RS485 over optical fiber cable gnuarm.deletethisbit@gmail.com - 2018-11-03 19:49 -0700
                Re: RS485 over optical fiber cable upsidedown@downunder.com - 2018-11-04 07:50 +0200
                Re: RS485 over optical fiber cable pozz <pozzugno@gmail.com> - 2018-11-05 09:40 +0100
                Re: RS485 over optical fiber cable Richard Damon <Richard@Damon-Family.org> - 2018-11-05 06:45 -0500
                Re: RS485 over optical fiber cable Rob Gaddi <rgaddi@highlandtechnology.invalid> - 2018-11-05 09:12 -0800
              Re: RS485 over optical fiber cable Grant Edwards <invalid@invalid.invalid> - 2018-11-02 18:21 +0000
                Re: RS485 over optical fiber cable upsidedown@downunder.com - 2018-11-03 00:02 +0200
          Re: RS485 over optical fiber cable pozz <pozzugno@gmail.com> - 2018-11-02 14:36 +0100
    Re: RS485 over optical fiber cable "Mat Nieuwenhoven" <mnieuw@zap.a2000.nl> - 2018-10-31 16:32 +0100
    Re: RS485 over optical fiber cable upsidedown@downunder.com - 2018-10-31 22:41 +0200
  Re: RS485 over optical fiber cable Chris <c@b.a> - 2018-10-31 12:16 +1100
    Re: RS485 over optical fiber cable upsidedown@downunder.com - 2018-11-02 06:52 +0200
  Re: RS485 over optical fiber cable Robert Wessel <robertwessel2@yahoo.com> - 2018-10-31 09:11 -0500
  Re: RS485 over optical fiber cable peter jakacki <peterjakacki@gmail.com> - 2018-11-12 19:57 -0800
    Re: RS485 over optical fiber cable upsidedown@downunder.com - 2018-11-13 08:09 +0200

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