I think Partick has a point. Why is the current trying to go through the
insulating top layer of the copper wire.
Now, if you study the skin effect and apply the formulas you will find out that
the skin effect on an insulating layer is very, very deep to the point that
hardly any (actually non to pay attention to) is going via the insulator. Same
thing with the oxidized layer on a bare copper wire. The skin effect "sends"
all (almost) to the conducting copper wire. The only time there might be a
problem is if the corroded layer is conducting enough to carry a sizable amount
of current and thereby cause attenuation. I doubt that the THHN isolation can
deteriorate to a conducting phase.
Aluminum wires have the advantage that aluminum oxide is not conducting unlike
copper oxide, the red oxide, is.
Man, this start to be complicated. Better find that North Seeking Owl.
Hans - N2JFS
-----Ursprüngliche Mitteilung-----
Von: Patrick Greenlee <patrick_g@windstream.net>
An: towertalk <towertalk@contesting.com>
Verschickt: Mi, 28 Dez 2016 8:57 am
Betreff: Re: [TowerTalk] UV and WX deterioration of THHN insulation, and effects
Skin effect... If skin effect can force conduction into the outer limit
of the wire (the chemically altered part with poor conductivity) then
why doesn't the skin effect force conduction out into the insulation and
really have poor conduction? (or in bare wire out into the surrounding air)
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