[RE-wrenches] double insulated wire

[Dave Click]

690.35(D) does *not* require PV WIRE be used for the whole dc circuit. 
You can use either: (quoting directly from 2008)
1) Nonmetallic jacketed multiconductor cables
2) Conductors installed in raceways, or
3) Conductors listed and identified as PV WIRE installed as exposed, 
single conductors

Similarly, I don't believe that the NEC requires red and black color 
coding, either, though it makes the most sense given convention.

Note Brian Teitelbaum's 6/3 email about PV WIRE noting that 
"double-insulated" is a bit of a misnomer. Some PV WIRE is single-insulated.

DKC


On 2013/6/28 13:47, aram at aramsolar.com wrote:
> In ungrounded systems the PV wire requirement is to be used the whole 
> DC circuit, so that is all the way to the inverter. 690.35 (D) is 
> pretty clear . Because it is ungrounded the protection is the PV 
> wire's fire rating and you don't get that with thhn/thwn.
> And of course Red for positive and black for negative.
> Most building departments have not pick up on this yet. But they will.
>
> Aram
>
>
>
>     -------- Original Message --------
>     Subject: Re: [RE-wrenches] double insulated wire
>     From: Will White <William.White at realgoods.com
>     <mailto:William.White at realgoods.com>>
>     Date: Fri, June 28, 2013 10:23 am
>     To: RE-wrenches <re-wrenches at lists.re-wrenches.org
>     <mailto:re-wrenches at lists.re-wrenches.org>>
>
>     We use PV Wire which is double insulated on the roof in free air
>     and regular THHN/TNWN for the run from the junction box back to
>     the inverter (using no white or gray wires of course).
>     Thanks,
>     Will
>     ____________________________________________________________________________________________
>     Will White
>     Regional Field Operations Manager -- New England
>     Real Goods Solar
>     64 Main St.
>     Montpelier, VT 05602
>     Tel: (802) 223-7804
>     Cell: (802) 234-3167
>     www.realgoodssolar.com <http://www.realgoodssolar.com/>
>     *From:*re-wrenches-bounces at lists.re-wrenches.org
>     <mailto:re-wrenches-bounces at lists.re-wrenches.org>
>     [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of
>     *Marco Mangelsdorf
>     *Sent:* Friday, June 28, 2013 1:10 PM
>     *To:* 'RE-wrenches'
>     *Subject:* [RE-wrenches] double insulated wire
>     I'm kinda confused.  With more transformerless inverters on the
>     market (e.g., SMA and Power-One), it's not clear to me if double
>     insulated wiring needs to be used all the way from each series
>     string to their respective inverter.
>     We've been installing the P1 3-6 kW TL inverters and there's no
>     apparent mention of needing to use such conductors, yet I remember
>     needing to do so when I installed a number of the 8, 9 and 10 kW
>     SMA TL inverters.
>     Thanks,
>     marco
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