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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