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<p>August;</p>
<p>Thanks for pointing out some of those code references, I'm always
learning new things. In case Eric's situation is not subject to
physical damage (as covered in 230.50) I found that 230.43 lists
many more allowable options for service entrance wiring, but NM
still is not on the list. I think the confusion may be with the
definition of "Feeder". Eric wrote that they tapped into the
"feeder" between the Meter and the Main disconnect. I may be
mistaken, but technically that is not a feeder; it would be
considered a service conductor. Service conductors are from the
utility to the main disconnect (service equipment), while feeders
are all the conductors after the Service equipment. I think the
Old school guy might have won that one.</p>
<pre class="moz-signature" cols="72">R. Ray Walters
Chief Technical Officer, RemoteSolar.com
BS Mech Engineering, 1988
Former NABCEP Certified, 2004-2016
Licensed Master Electrician, Colorado
303 505-8760</pre>
<div class="moz-cite-prefix">On 4/4/17 5:17 PM, August Goers wrote:<br>
</div>
<blockquote
cite="mid:caf27615b9e550149c73db32405f5bdf@mail.gmail.com"
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hi
Eric,</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">Regarding
the supply side connection, check out this article: <a
moz-do-not-send="true"
href="http://iaeimagazine.org/magazine/2013/11/16/supply-side-pv-connections-a-closer-look/">http://iaeimagazine.org/magazine/2013/11/16/supply-side-pv-connections-a-closer-look/</a></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">Check
out 2014 NEC 230.50 – I don’t think NM is allowed. In our
neck of the woods we need to use RMC or IMC.</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">Secondly,
I’d recommend referring to the NM cable’s spec sheet to
determine ampacity. Also see NEC 334.80 which limits the
ampacity to 60 deg C. </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">50
A x 1.25 = 62.5, so your NM has to be rated at this or
higher. </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a
moz-do-not-send="true"
href="http://www.southwire.com/products/RomexSIMpullTypeNMBOEM.htm">http://www.southwire.com/products/RomexSIMpullTypeNMBOEM.htm</a>
- regular NM 60 deg rated #6 55 A</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">I’m
not familiar with 90 degree NM.</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">August</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">Luminalt</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></p>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
RE-wrenches [mailto:<a moz-do-not-send="true"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>]
<b>On Behalf Of </b><a moz-do-not-send="true"
href="mailto:eric@harvesthesun.com">eric@harvesthesun.com</a><br>
<b>Sent:</b> Tuesday, April 04, 2017 2:50 PM<br>
<b>To:</b> RE-wrenches <<a moz-do-not-send="true"
href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>
<b>Subject:</b> [RE-wrenches] NM Cable temp rating,
ampacity, application</span></p>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal">Hi Wrenchers,</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">I recently butted heads with an old
school electrician who has been scrutinizing a recent
install (fully permitted & PTO'd last year) and I wonder
how applicable and valid his concerns are. I'm not
interested in an ego war with this guy; I just want to be
code-compliant and safe. This sparky (let's call him Karl)
has questioned my electrician's (let's call him Dave) use of
NM cable on the AC side of the solar install.</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">The first issue that Karl raised was that
Dave installed Romex for our supply-side connection, i.e.,
from our fused disconnect to the Polaris vampire clamps on
the feeder conductors between the meter and the main disco.
Karl contends that the Romex, by extension off of the
utility feeders, is now a service entrance conductor and
that NEC Article 334.12 dictates that Romex cannot be used
as service entrance conductors. Wondering how you all might
interpret this scenario. (note: We have the opportunity to
pull new conductors, should the consensus be that we
violated the NEC)</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">The second issue is that Dave ran 6AWG
Romex from the fused disconnect to the main breaker in the
combining subpanel and landed the circuit on a 70A breaker.
The inverter circuit is rated at max current of 50A
continuous. Karl is telling us that the #6 Romex is rated at
60 degrees and 55 amps. It is my understanding that all NM
cable is now rated at 90 degrees. However, I also understand
that there may be some merit to Karl's assessment regarding
limited ampacity of the 6AWG Romex. Can someone illuminate
this issue for me as to whether or not NM cable is rated at
90 degrees AND therefore a 6AWG conductor in NM cable would
have a 75A rating?</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">Cheers,</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">Eric</p>
</div>
<div>
<p class="MsoNormal">SunHarvest</p>
</div>
</div>
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