[Elecraft] Current Flow on Copper Strips - a Question

[Martin Sole]

I go for the Polyphaser approach. I have used and installed their PEEP 
system on multiple sites here in Thailand. High exposed sites with a lot 
of lightning. Notable over the 20 years since the first one was 
installed there is significantly higher equipment reliability of 
equipment at those sites and none of what were historically regarded as 
"typical regular failures".

The PEEP system tries to keep any surge energy outside the building. I'm 
a firm believer in not letting it inside any more than is absolutely 
unavoidable. In a lot of cases once it gets in the building it is highly 
unpredictable. Think 4 inch hole burned in pcb back plane, steel rack 
cabinet door and vapourised wall mounted fire bell.

The whole sites have very good protection systems designed primarily 
around FAA-019E standard, though I would agree with Polyphaser that some 
of what is contained in that standard is not always ideal. A lot of 
historical convention gets passed on unquestioned into some of these 
standards over the years it would seem.

Regards
Martin, HS0ZED




On 27/04/2018 21:33, John Huggins, kx4o wrote:
> What's more appropriate for coaxial building entry grounding management?
>
> This wide-strap, allegedly low inductance, approach...
>
>    https://www.comm-omni.com/polyweb/images/pb.jpg
>
> ...or this more R56 approach...
>
>    http://www.radio2way.net/MGB.jpg
>
> ?
>
> 73
> John, kx4o
>
> On Fri, April 27, 2018 02:21, Wes Stewart wrote:
>> "When skin effect is present, the current is always redistributed over
>> the conductor cross section in such a way as to make most of the current
>> flow where it is encircled by the smallest number of flux lines.  This
>> general principle controls the distribution of current irrespective of the
>> shape of the conductor involved. Thus, with a flat strip conductor (figure
>> reference not shown) the current flows primarily along the edges, where it
>> is surrounded by the smallest amount of flux, and the true or effective
>> resistance will be high because most of the strip carries very little
>> current.  (A reference to the missing figure) makes clear that it is not
>> the amount of conductor surface that determines the resistance to
>> alternating current but rather the way in which the conductor material is
>> arranged."
>>
>>
>
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