[126425] in North American Network Operators' Group
Re: POE switches and lightning
daemon@ATHENA.MIT.EDU (Ingo Flaschberger)
Fri May 14 19:43:00 2010
Date: Sat, 15 May 2010 01:42:45 +0200 (CEST)
From: Ingo Flaschberger <if@xip.at>
To: North American Network Operators Group <nanog@nanog.org>
In-Reply-To: <0D485411-B0F2-4E0B-B8E3-3148081B1BC4@americafree.tv>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
>> We had a lightning strike nearby yesterday that looks to have come inside
>> our facility via a feeder circuit that goes outdoors underground to our
>> facility's gate.
Perhaps there was a "move" of the earth-level relative to the neutral
line.
I have no idea how neutral-line to earth potential is handled in us, but
here in austria we use a so called "nullung".
That means that the earth-ground potential line of the building (which
includes also the lightning conductor) is connected to the neutral power
line where it enters the building, keeping this potential-difference low.
Theres also a potential between earth ground and the neutral-phase of the
online-ups.
The ethernet-cables; utp or stp?
pannels correctly earthed?
Perhaps a electrician should check the earthing.
Also all copper lines that enter the building should be protected by
lightning protectors.
Kind regards,
Ingo Flaschberger
