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
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