Fortunately, it seems that lightning is not as frequent in high
northern and southern latitudes as is in tropical regions.
I was told about a story of a group of Swedish scientists
involved in thunderstorm studies, having built a little lab
in the village with the best reputation of high probability
of lightning, receiving after several years without events
a delegation of the residents "very grateful because after
the lab installation there was no more lightning".
Best regards,
Antonio
CT1TE
Em 2012-04-12 17:20, Said Jackson escreveu:
One interesting fact: frozen ground is a bad conductor.
The ground potential around your house may go up many 1000s of volts
even with just a proximity strike, while the power feed stays down,
blowing up anything connected to "ground". Thus the special Nordig
surge protection requirements for TV receivers in northern European
countries..
On Apr 12, 2012, at 6:58, Jim Lux <jim...@earthlink.net> wrote:
On 4/12/12 6:22 AM, Michael Baker wrote:
Time-nutters--
Around here (N. Central Flori-DUH) it is not uncommon for
near-by lightning strikes to damage underground cables and
wiring. This is why buried wiring to things like driveway
gate-openers are often placed in conduit rather than done
with direct-burial wiring so that if lightning damages the
wiring a new cable can be pulled through the conduit without
having to re-dig the burial trench.
Some years ago I had occasion to hold some long discussions
with Martin Uman, one of the worlds most distinguished and
eminent lightning researchers. He commented that even with
the most extraordinary and costly efforts to install protection
measures, that-- sooner or later-- there was a good chance that
lightning would find a way to damage things.
Dr. Uman (and his colleague Dr. Rakov) probably know about lightning
and effects than any other humans alive. He's making an excellent
point: at some point, the cost to replace the gear (or the cost of
being "off the air") is smaller than the cost of the protection
scheme.
Sometimes, you're better off having a sacrificial element, and a
spare in the closet for speedy repair.
His lightning research laboratory was located here in
N.Central Florida because it is in the heart of the most
dense strike area in N. America.
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