[time-nuts] Thoughts on lightning protection measures....

[Antonio Amandio Sanches de Magalhaes]

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 <jimlux at 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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