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<font face="Helvetica, Arial, sans-serif">Belated thanks for the
replies on this, Jason et al. Sorry for my lack of a clear
explanation- Jason interpreted me correctly. Apparently this
Lennox unit was installed without a neutral- I'm awaiting more
info from the PE.</font><br>
<br>
<div class="moz-cite-prefix">On 2013/7/5 19:25, Jason Szumlanski
wrote:<br>
</div>
<blockquote
cite="mid:CAJJtG3pa9PQWfufUuFeU78jU6DWp7dWQioNTEdeb8DfrF6hX-g@mail.gmail.com"
type="cite">
<p>I think what Dave is saying is that the enphase cable neutral
is connected to the EGC in the roof mounted j-box, and no
neutral is run to the Lennox panel or disconnect. While the
neutral should not carry line current under normal operation,
Enphase calls it a neutral - look up the NEC definition of
neutral. I can see an AHJ having reservations about this,
whether the "combined Neutral/EGC/GEC" is bare or insulated. </p>
<p>I would not waste time trying to argue this with the AHJ. I
would bring three current carrying conductors plus a combined
EGC/GEC to the main distribution panel, just like every other
Enphase job we do. </p>
<p>I spend a fair amount of time explaining how this solar powered
air conditioner is nothing revolutionary, except for the
creative marketing. Anyone out there try to team up with a HVAC
company to market any A/C unit as solar powered?</p>
<p>Jason Szumlanski<br>
Fafco Solar</p>
<div class="gmail_quote">On Jul 5, 2013 5:14 PM, "August Goers"
<<a moz-do-not-send="true" href="mailto:august@luminalt.com">august@luminalt.com</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Dave,<br>
<br>
I'm not sure I'm understanding your scenario clearly but I'll
take a crack<br>
at it. The Enphase system should have a bare #6 GEC for each
micro and can<br>
then transition to a #8 green GEC once in conduit and run all
the way back<br>
to the main ground electrode system. The #6 and #8 should be
irreversibly<br>
crimped together since the GEC needs to be continuous.
Certainly it is not<br>
okay for the neutral in the Lennox panel to be bare unless it
is somehow a<br>
main panel. You could run the DC GEC along with the other
conductors and<br>
it can serve as a dual purpose GEC and equipment grounding
conductor per<br>
2011 NEC 690.47(C)(3).<br>
<br>
Best,<br>
<br>
August<br>
-----Original Message-----<br>
From: <a moz-do-not-send="true"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a><br>
[mailto:<a moz-do-not-send="true"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>]
On Behalf Of Dave Click<br>
Sent: Wednesday, July 03, 2013 6:26 AM<br>
To: RE-wrenches<br>
Subject: [RE-wrenches] EGC for Enphases<br>
<br>
All,<br>
<br>
I was just looking at small 4-module Andalay (Enphase 190)
system tying<br>
into one of the Lennox solar-ready air conditioners. The
engineer had<br>
specified the 690.47(C) GEC be run directly from the array
down to the<br>
existing electrode. Running from the inverters is a 2+G wire
to the Lennox<br>
panel; they are using the uninsulated ground as the circuit
neutral. It<br>
seems to me that this violates 200.7 (grounded conductor
marked white or<br>
grey). Also, 250.134(B) (EGC run with circuit conductors),
about which the<br>
engineer states "I have been studying the NEC on this and I
believe that<br>
the intent is to permit the ground to be carried with the
current carrying<br>
conductors, not require."<br>
<br>
Am I missing something?<br>
<br>
Thanks,<br>
Dave<br>
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