[RE-wrenches] #10 THWN-2

Mark Westbrock westbrock at positiveenergysolar.com
Fri Jul 23 10:01:15 PDT 2010


-2 indicates that the insulation is rated for "hot & wet"; that is that 
it is rated for 90C and wet conditions.  See NEC  Table 310.13(A).

We also use Encore Wire.  The sticker on the spool has THHN in big 
print, but then in small print below it says "Type MTW or THHN or 
THWN-2".  The insulation also says "Type MTW or THHN or THWN-2".

Mark

Mark Westbrock
NABCEP Certified Solar PV Installer
NM ER-1J Journeyman Electrician
Positive Energy, Inc.
office: 575-524-2030
cell: 575-640-2432
westbrock at positiveenergysolar.com
www.positiveenergysolar.com



Mick Abraham 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 <mailto: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
>     <mailto: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
>>     peter.parrish at calsolareng.com
>>     <mailto:peter.parrish at calsolareng.com> 
>>     Ph 323-258-8883, Mobile 323-839-6108, Fax
>>     323-258-8885                                                              
>>                                         
>>
>>      
>>
>>      
>>
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