I believe the only requirement for single exposed source circuit conductors in an ungrounded PV system (which encompasses TL inverter systems) is that they be listed (PV) wire until they reach an enclosure/raceway. That's a paraphrase of 2011 690.35 (D). Double insulated wires are not mentioned specifically, some listed PV wire is double insulated, some is not.
Marco is right, in that some modules have listed PV wire whips, others just use USE-2 or similar. If you don't want to get dinged by the rare inspector that actually checks these things (essentially non-existent here in Ohio), you better make sure your modules comply. This is my understanding at least. Daniel Young, NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90 NABCEP Certified Solar Heating InstallerTM: Cert #SH031409-13 From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Marco Mangelsdorf Sent: Friday, August 30, 2013 5:54 PM To: 'RE-wrenches' Subject: Re: [RE-wrenches] double-insulated PV wire Note that this also assumes that the conductor whips from the modules ARE ALSO double insulated if they're to be used with TL inverters. Some mods have 'em, some do not. From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of William Miller Sent: Friday, August 30, 2013 11:52 AM To: 'RE-wrenches' Subject: Re: [RE-wrenches] double-insulated PV wire Marco: Good point. If one can position transition boxes close enough to the modules, you can use only the leads from the modules, avoiding the need to buy any PV wire. It is surprisingly easy to do. See: http://www.millersolar.com/MillerSolar/practices/PV_wiring/PV_Cable_wiring/_ PV_Cable_Wiring.html WM double-insulated wire has to be used from the module series string to the first enclosure and enclosed raceway where the transition to standard THHN/THWN wire can be made. marco _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2242 / Virus Database: 3222/6119 - Release Date: 08/29/13
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