I think there are a variety of ways to meet the listing. See this link: http://www.ul.com/asiaonthemark/as-en/2009-Issue30/page1.htm
Cheers, Brian Typos courtesy of my iPhone. On Jun 3, 2013, at 12:45 PM, Brian Teitelbaum <[email protected]> wrote: > Esteemed Wrenches, > > We are having a hard time finding a source of PV Wire with a 1000V rating > that will fit into a two-hole 1/2" strain relief. It seems that all of the > wire brands that are “double-insulated” just have too large of a diameter to > get two of them though a 1/2" strain relief, needed since most common > combiners have 1/2" knockouts for wire entry. However, we have found a source > of single-insulated wire that is UL Listed and bears the “PV Wire” marking. > > I’ve always been under the assumption that “double-insulated wire” was > necessary when using transformerless grid-tie inverters, as it is with power > tools that only have two-prong plugs on them. However I can’t find that > specific language in the Code. It just says “must be marked as PV Wire”. I > also found this quote about PV Wire from John Wiles (underlining mine): > > “The thickness is specified and there may be one or two layers of insulation. > The insulation must pass an accelerated UV test of 720 hours and will be > marked “Sunlight Resistant.” PV cable/PV wire also has smoke and > flame-retardants and may be used inside conduit inside buildings. In the > U.S., it should > not be called a ‘double-insulated cable’ as that is a purely European term.” > > This appears to mean that double-insulation is not required for > transformerless (non-isolated) inverters; just that it needs to be marked as > “PV Wire”. Can anyone here confirm, hopefully with documentation, that > actually having “double-insulation” is not required when using non-isolated > inverters? > > Thanks > > > Brian Teitelbaum > AEE Solar > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > 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 >
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