[RE-wrenches] "PV wire"

[August Goers]

Marco,

For a standard 600 volt non-isolated (transformerless) inverter based
systems, you just need to make sure that your array source circuit
conductors have a "photovoltaic or PV wire" rating. You can also switch to
standard THWN-2 once you get into conduit.

This Solar Pro article might help:

http://solarprofessional.com/articles/design-installation/ungrounded-pv-power-systems-in-the-nec/page/0/9

Best,

August

*August Goers*

Luminalt Energy Corporation

o: 415.641.4000

m: 415.559.1525

www.luminalt.com



On Thu, Oct 23, 2014 at 2:29 PM, Marco Mangelsdorf <marco at pvthawaii.com>
wrote:

>  Yet again this “PV wire” thing rears its head.
>
>
>
> For our PV systems using transformerless (TL) inverters, our standard
> practice has been to use double-insulated conductors for all DC circuits
> coming into the TL inverter(s), which we believe represents the best
> practice.
>
>
>
> However, there doesn’t appear to be any requirement stated in the code
> that states the need to use double-insulated conductors for DC circuits and
> TL inverters.
>
>
>
> So I’m thinking, why pay the extra expense for the double-insulated wire
> when single-insulated wire may suffice.
>
>
>
> Anyone know of anything written somewhere that requires the use of
> double-insulated conductors in TL DC circuits?
>
>
>
> Thanks,
>
> marco
>
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive:
> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> www.members.re-wrenches.org
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20141023/a7710e39/attachment-0002.html>