Re: [RE-wrenches] double insulated wire

aram Fri, 28 Jun 2013 10:48:14 -0700

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 <[email protected]>
Date: Fri, June 28, 2013 10:23 am
To: RE-wrenches <[email protected]>

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

From: [email protected] [mailto:[email protected]] 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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Re: [RE-wrenches] double insulated wire

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