Hi,
IIRC from A-level physics, a spark jumps 1 centimeter per 100kV in dry air,
so a cloud-to-ground lightning bolt must be zillions of volts! (recently
concerned - sailing in variable weather last week!).
On topic, having lost a couple of modems to storm-induced surges (I assume -
it was always when I was away on vacation!), I fitted some in-line
suppressors "rescued" from the UPSes we used at work. No further problems.
I would assume (that word again!) that a surge in the megavolt range would
be dissipated to ground a fair bit while travelling down power lines, as the
insulation would break down all over the shop.
Regards,
Richard.be
----- Original Message -----
From: "Andy Medina" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Sunday, August 20, 2006 8:13 PM
Subject: Re: Surge protecting 10/100 Base-T cable modem connection
On Sun, 20 Aug 2006, James Button wrote:
While I don't know of any particular device,
I worked for a company who had 'optical relays' installed for their
digital comms lines -
shame it didn't work when they got a lightning strike !
NOTHING works with a (almost) direct lightning strike ! Those million
volts have been traveling through miles of air. It will jump across the
small gap (including the "isolated" optical gap) created when the
protection device blows. Actually it will probably fuse [no pun intended
:) ] the device into "one solid mass".
--
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