-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
westbr...@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
<nicksoleilso...@yahoo.com <mailto:nicksoleilso...@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.parr...@calsolareng.com
<mailto:peter.parr...@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.parr...@calsolareng.com
<mailto:peter.parr...@calsolareng.com>
Ph 323-258-8883, Mobile 323-839-6108, Fax
323-258-8885
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