[RE-wrenches] #10 THWN-2

[David Brearley]

Mick,

THWN-2 is 90°C rated per Table 310.16. This is key for conductors in conduit
on a roof. On a roof in full sun ambient temperatures are such that a 75°C
rated conductor will have a severely diminished allowable ampacity, if any
allowable ampacity.

Jollily,

David


On 7/23/10 11:52 AM, "Mick Abraham" <mick at abrahamsolar.com> wrote:

> I'm sorry to broadcast my ignorance, but:
> 
> Could someone explain to me the significance of the -2 marking? Reply off-list
> if you wish to save bandwidth...but other List members may also be
> wondering... 
> 
> Thanks, 
> 
> Mick Abraham, Proprietor
> www.abrahamsolar.com <http://www.abrahamsolar.com>
> 
> Voice: 970-731-4675
> 
> 
> On Fri, Jul 23, 2010 at 10:48 AM, Nick Soleil <nicksoleilsolar at yahoo.com>
> wrote:
>> I have specified THWN-2 for years, but occasionally will not be able to
>> source it!
>> 
>> Sent from my iPhone
>> 
>> On Jul 23, 2010, at 11:37 AM, "Peter Parrish" <peter.parrish at calsolareng.com>
>> wrote:
>> 
>>> We went through a similar problem with some beach communities here in SoCal.
>>> Because of the high humidity (all winter and summer mornings) they wanted
>>> THWN-2 for all conduit runs (as well as PVC instead of EMT). At first we
>>> were charged a premium for THWN-2 compared to THHN. But then we found a
>>> source at All Phase Electrical Supply Burbank CA (a part of CED) for THWN-2
>>> #10 stranded @ $162.40/k-ft. Brand is En(m?)core Wire. THWN-2 listing is
>>> printed on the insulation.
>>>  
>>> - Peter
>>>  
>>> 
>>> Peter T. Parrish, Ph.D., President
>>> California Solar Engineering, Inc.
>>> 820 Cynthia Ave., Los Angeles, CA 90065
>>> CA Lic. 854779, NABCEP Cert. 031806-26
>>>  <mailto:peter.parrish at calsolareng.com> peter.parrish at calsolareng.com 
>>> Ph 323-258-8883, Mobile 323-839-6108, Fax
>>> 323-258-8885                                                              
>>>                                     
>>>  
>>> 
>>>  
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