[RE-wrenches] 1000V PV Wire

[Brian Mehalic]

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 <bteitelbaum at aeesolar.com> 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
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