Hi Marco;
Article 200.7 specifically prohibits using white wire for anything but
grounded conductors. This came up last year on a large project with an
ungrounded array, that also had white incorrectly specified in the
plans. The appropriate colors would be red for positive, and black for
negative.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 9/23/2013 1:27 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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