Lightining

[Michael]

well, in the current (and possibly last) analysis I blew the ports in the
modem and the hdmi card in the computer in the next room. Now to see if
parts start to fail in a cascade (like what happened when I was in Arizona.
I stioll love gainesville; I just have to unplug all of my electronics when
it starts to lightening.

On Thu, Jun 2, 2016 at 8:11 PM, Eric Oyen <eric.oyen at icloud.com> wrote:

> wow,
> this almost looks like a ham radio discussion list with this topic (btw,
> we hams also have need to protect sensitive gear). I will have to dig up a
> publication online. I think the ARRL has it. It details ways to save your
> equipment from all these hassles and also reduce noise (some kinds of noise
> can adversely affect how computer equipment operates).
>
> -eric
>
> On Jun 2, 2016, at 4:25 PM, KevinO wrote:
>
> > On 06/02/2016 01:52 PM, Mike Bushroe wrote:
> >> ... And of course consider lightning rods on the roof and above the
> tallest
> >> things (trees or antennas) on the property. No guarantee that ALL of
> that
> >> would have stopped such a close strike but I think it would have greatly
> >> reduced the damage, especially the collateral damage.
> >>
> >>
> > Hello Mike
> >
> > We took a direct hit to the antenna... Thankfully, the antenna served as
> a
> > lightning rod.
> >
> > When you have that high of a dI/dt, that close, the magnetic flux is
> going to
> > induce currents into every conductive-loop nearby. A voltage surge with
> a field
> > intensity of many kV/foot propagates outward from the point of strike
> and across
> > the ground.
> >
> > I had a battery powered toy turn itself on when the strike hit... and so
> did one
> > of the neighbors. Both of these were just sitting on tables... not
> electrically
> > connected to anything.
> >
> > While I didn't have a whole-house suppressor, the vast majority of my
> damage was
> > from induced currents in ethernet, audio, and video cables strung around
> the
> > house. The induced current in the copper line feeding the swamp cooler
> gave it a
> > big enough jolt to destroy the controller I made for it in the attic
> just below.
> > (A 1kV 0.1uF ceramic disk cap I had across a 12v rail was blow to little
> burnt
> > pieces)
> >
> > I did have six computers survive and keep running without any damage at
> all. Two
> > more froze: one lost an ethernet card and the other a video card. Five
> of the
> > 'unscathed" computers were racked up in a common rack with in-rack UPSs
> and surge
> > suppressor.
> >
> > If either of the neighbors had had a whole-house suppressor or inductors
> on their
> > mains, it might have helped them.
> > --
> > KevinO
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-- 
:-)~MIKE~(-:
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