[TowerTalk] UV and WX deterioration of THHN insulation, and effects at R

[W0MU Mike Fatchett]

Just curious if you think this is just a skin effect and if you were to 
use steel wool and shine the copper up after stripping if the copper 
acts normally or is there something happening chemically or atomically?

W0MU



On 12/27/2016 10:01 PM, Guy Olinger wrote:
> On Tue, Dec 27, 2016 at 7:49 PM, Rob Atkinson <ranchorobbo at gmail.com> wrote:
>>> What IS complicated is how so many clearly have some kind of stake in
>>> it NOT being true.
>> I wouldn't call it "some kind of stake" as much as simple doubt
>> because what you assert is, to be charitable, unsupported by
>> observation.
> "Unsupported by observation"   You jest?
>
> The disintegration is very much supported by measurement and
> observation. Those measurements, and the methods used, are recently
> posted on this reflector.
>
> I would also counter that durability outdoors, **particularly** given
> THHN is not manufactured to this use, and forbidden for wet
> environments in the NEC, is no more than an **assumption**. If THHN
> were misused in this way in a professional setting it would be
> considered an outright error in judgement. Certainly outdoor exposed
> THHN would flunk an electrical inspection, with all the delay and cost
> penalty involved.
>
> So just why is THHN durability in outside environment given the free
> pass to skeptical treatment?
>
> I'll go back to the charitable "some kind of stake" because I really
> do not get it.
>
> 73, Guy K2AV
>
>>> Someone with a low band dipole in the air using unstripped THHN may be
>>> paying quite a penalty, especially if it's been up a long time.
>> How long is "a long time?"
> 2,3,4,5 years perhaps to get to the extreme deterioration we measured.
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