[RE-wrenches] Sunlight Resistant THWN-2

[Ray Walters]

I'd be super sure: I just pulled some wire out of a weatherhead that was 
probably 20 years old.  All the out door exposed conductors had the 
insulation cracked completely through showing several feet of bare copper.
I wish I had taken a picture, it was NOT just the outer clear covering, 
it was a complete insulation breakdown.
This has passed Denver City Electrical inspection BTW.

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 11/26/2013 6:55 AM, Dave Click wrote:
> Andrew, that looks legit to me. I think that a lot of the larger 
> THWN-2 is sunlight resistant, but the outer clear layer will probably 
> start peeling off within a few months of the installation (see 
> attached). I imagine the same issues we see with colored USE-2 fading 
> over time would also apply to THWN-2.
>
> Caveats would be 690.31(A) requiring readily-accessible output circuit 
> wiring be installed in a raceway, and 690.35(D) requiring ungrounded 
> dc wiring (source or output circuit) be installed as either PV WIRE or 
> within a raceway or TC.
>
> DKC
>
>
> On 2013/11/25, 14:13, Andrew Truitt wrote:
>> Wrenches - Is anyone familiar with sunlight resistant THWN-2?  I'm 
>> inspecting a groundmount on a Landfill where all PV Output Circuit 
>> wiring is in exposed cable tray (since they can't dig) and they are 
>> using SouthWire SIMpull sunlight resistant THWN-2 conductors. 
>>  NEC2011 690.31(B) specifies USE-2 or PV Wire for Source Circuit 
>> wiring and module interconnection, but doesn't address Output Circuit 
>> wiring.  Here are the specs for the wire types used:
>>
>> http://www.southwire.com/products/SIMpullAluminumT90.htm
>>
>> http://www.southwire.com/products/SIMpullTHHNCableAlumflexConductors.htm
>>
>>
>> Is this legit?
>>
>>
>>
>> For a brighter energy future,
>>
>>
>> Andrew Truitt
>>
>> Principal
>> Truitt Renewable Energy Consulting, LLC
>>
>> (202) 486-7507 <tel:%28202%29%20486-7507>
>>
>> LinkedIn Profile <http://www.linkedin.com/pub/andrew-truitt/8/622/713>
>>
>> Company Website<http://truittreconsulting.weebly.com/>
>>
>> NABCEP Certified PV Installation Professional ID: 032407-66
>>
>> Colorado Journeyman Electrician License No.: 600132
>>
>> <tel:%28202%29%20486-7507>
>>
>> 24 copy.jpg
>>
>> "Don't get me wrong: I love nuclear energy! It's just that I prefer 
>> fusion to fission. And it just so happens that there's an enormous 
>> fusion reactor safely banked a few million miles from us. It delivers 
>> more than we could ever use in just about 8 minutes. And it's wireless!"
>>
>> ~William McDonough
>>
>>
>>
>>
>>
>>
>>
>>
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