Even though they say "Photovoltaic" in the spec sheet, I am not sure that this is "PV Wire". I don't see anywhere that it actually uses those exact words, and that is the designation in the NEC.
Blessings, Kelly On Sep 27, 2013, at 10:38 AM, August Goers wrote: > Marco, > > Yes, there is single jacketed PV wire. I've attached a spec sheet for some > 1000 V wire we've been using. I don't know anything about the actual wiring > construction and why single versus double jacketing may or may not be used. I > just know it needs to be listed for the purpose. > > Best, August > > From: re-wrenches-boun...@lists.re-wrenches.org > [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Marco > Mangelsdorf > Sent: Friday, September 27, 2013 10:28 AM > To: 'RE-wrenches' > Subject: [RE-wrenches] transformerless inverters and conductor colors > > Thanks, August. > > OK, so I’ve found “PV wire” that’s double-insulated. (See attached spec > sheet from Falcon wire.) > > Is there PV wire out there that’s just got a single insulation layer that > qualifies as per what came from that helpful article below? > > marco > USE-2 is a standard wire designated for underground service entrance, > typically used to connect terminals of a variety of service equipment. PV > wire is specifically designated for use in PV module interconnections. Both > cables are rated for 90oC wet or dry. PV wire, however, has thicker > insulation to withstand the harsh environments frequently found in PV > installations. USE-2 carries a 600V rating, whereas PV wire can be rated at > 600V, 1000V or 2000V. There are separate ratings with increased insulation > thickness for each cable. > > Both USE-2 and PV wire can be used with grounded systems, but only PV wire > may be used with ungrounded systems per NEC 2008. Since USE-2 has typically > been installed underground or in environments where flame is unlikely, it > usually does not require a flame retardant rating.The PV wire designation > does include a VW-1 flame test requirement. Both ratings are sunlight > resistant, but the PV wire rating applies a more stringent test requirement > of 720 hours in weatherometer vs. 300 hour weatherometer test for USE-2. > > > From: re-wrenches-boun...@lists.re-wrenches.org > [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of August Goers > Sent: Friday, September 27, 2013 4:18 AM > To: RE-wrenches > Subject: Re: [RE-wrenches] transformerless inverters and conductor colors > > Marco, > > My understanding is that PV wire is a separate listing. Exposed DC wiring > with ungrounded non-isolated systems must be PV wire. USE-2 wire is not > necessarily PV wire unless listed and labeled as PV wire. Here's a decent > article: > > http://www.renewableenergyworld.com/rea/news/article/2010/11/performancecost-trade-offs-in-pv-systems-wiringcabling-selection > > Best, August > > From: re-wrenches-boun...@lists.re-wrenches.org > [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Marco > Mangelsdorf > Sent: Friday, September 27, 2013 12:24 AM > To: 'RE-wrenches' > Subject: [RE-wrenches] transformerless inverters and conductor colors > > Thanks, Glen. > > This brings up the question of what exactly constitutes “PV Wire.” “PV > wire” does not necessarily = double-insulated wire which I thought is > required with ungrounded PV systems on the DC side at least until you hit an > enclosure and enclosed raceway where you can transition to THWN-2 wire. Is > there a clear and unambiguous definition out there of what constitutes “PV > Wire”? To some XLP/USE-2/RHW-2 wire is “PV Wire.” > > marco > > 2008 NEC > > 690.35 Ungrounded Photovoltaic Power Systems. > Photovoltaic power systems shall be permitted to operate with ungrounded > photovoltaic source and output circuits where the system complies with > 690.35(A) through (G). > (A) Disconnects. > (B) Overcurrent Protection. > (C) Ground-Fault Protection. > (D) The photovoltaic source conductors shall consist of the following: > (1) Nonmetallic jacketed multiconductor cables > (2) Conductors installed in raceways, or > (3) Conductors listed and identified as Photovoltaic (PV) Wire > installed as exposed, single conductors. > > Raceway. An enclosed channel of metal or nonmetallic materials designed > expressly for holding wires, cables, or busbars, with additional functions as > permitted in this Code. Raceways include, but are not limited to, rigid metal > conduit, rigid nonmetallic conduit, intermediate metal conduit, liquidtight > flexible conduit, flexible metallic tubing, flexible metal conduit, > electrical nonmetallic tubing, electrical metallic tubing, underfloor > raceways, cellular concrete floor raceways, cellular metal floor raceways, > surface raceways, wireways, and busways. > > Reads to me like you can transition to THWN-2 inside a rooftop jbox from the > PV wire under the modules, as long as it is in a raceway. > > -Glenn Burt > <EncoreWire-Photovoltaic > (2).pdf>_______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
_______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
