[RE-wrenches] double-insulated PV wire

[Daniel Young]

I believe the only requirement for single exposed source circuit conductors
in an ungrounded PV system (which encompasses TL inverter systems) is that
they be listed (PV) wire until they reach an enclosure/raceway. That's a
paraphrase of 2011 690.35 (D). Double insulated wires are not mentioned
specifically, some listed PV wire is double insulated, some is not. 

 

Marco is right, in that some modules have listed PV wire whips, others just
use USE-2 or similar. If you don't want to get dinged by the rare inspector
that actually checks these things (essentially non-existent here in Ohio),
you better make sure your modules comply.

 

This is my understanding at least.

 

Daniel Young, 

NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90

NABCEP Certified Solar Heating InstallerTM: Cert #SH031409-13

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Marco
Mangelsdorf
Sent: Friday, August 30, 2013 5:54 PM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] double-insulated PV wire

 

Note that this also assumes that the conductor whips from the modules ARE
ALSO double insulated if they're to be used with TL inverters.  Some mods
have 'em, some do not.

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William
Miller
Sent: Friday, August 30, 2013 11:52 AM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] double-insulated PV wire

 

Marco:

 

 

Good point.  If one can position transition boxes close enough to the
modules, you can use only the leads from the modules, avoiding the need to
buy any PV wire.  It is surprisingly easy to do.  See:

 

http://www.millersolar.com/MillerSolar/practices/PV_wiring/PV_Cable_wiring/_
PV_Cable_Wiring.html

 

WM

 

 

double-insulated wire has to be used from the module series string to the
first enclosure and enclosed raceway where the transition to standard
THHN/THWN wire can be made.

 

marco

 

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