[RE-wrenches] transformerless inverters and conductor colors

[Kelly Larson]

Hi Marco,

I don't think there are grounded current carrying conductors on the array side of any of the UL listed transformerless inverters available today in the US.  NEC reserves the color white for grounded current carrying conductors, so for a NEC compliance, the white wire is a purchasing error.  Red, (or some other color other than white, grey, green, bare, or green with yellow stripe), would be NEC compliant.

Blessings,
Kelly

Kelly Larson
707-223-3209

Box 504
Ukiah, CA 95482
Electrical Engineer
NABCEP Certified Solar PV Installation Professional
ISPQ Master Trainer
CA Electrical Contractor# 868189
SolarKelly.com



On Sep 23, 2013, at 12:27 PM, Marco Mangelsdorf wrote:

> Hi all,
>  
> We’re doing more and more installs with TL inverters (SMA and P1).
>  
> I’m using double-insulated wire from the array string to the first enclosure, as in j-box, and then transitioning to standard THHN/THWN wire.
>  
> I recently purchased some of that #10 double-insulated wire, getting a spool of black and white.
>  
> Then after receiving the two spools it occurred to me: since the array is ungrounded, as far as there being no grounded conductor in the circuit, did I blow it by getting a spool of white wire?
>  
> What sayeth you all?  Can I not use that white wire in those array circuits for TL inverters?
>  
> Thanks,
> marco
>  
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