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.
On 2013/7/5 19:25, Jason Szumlanski wrote:
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.
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.
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?
Jason Szumlanski
Fafco Solar
On Jul 5, 2013 5:14 PM, "August Goers" <aug...@luminalt.com
<mailto:aug...@luminalt.com>> wrote:
Hi Dave,
I'm not sure I'm understanding your scenario clearly but I'll take
a crack
at it. The Enphase system should have a bare #6 GEC for each micro
and can
then transition to a #8 green GEC once in conduit and run all the
way back
to the main ground electrode system. The #6 and #8 should be
irreversibly
crimped together since the GEC needs to be continuous. Certainly
it is not
okay for the neutral in the Lennox panel to be bare unless it is
somehow a
main panel. You could run the DC GEC along with the other
conductors and
it can serve as a dual purpose GEC and equipment grounding
conductor per
2011 NEC 690.47(C)(3).
Best,
August
-----Original Message-----
From: re-wrenches-boun...@lists.re-wrenches.org
<mailto:re-wrenches-boun...@lists.re-wrenches.org>
[mailto:re-wrenches-boun...@lists.re-wrenches.org
<mailto:re-wrenches-boun...@lists.re-wrenches.org>] On Behalf Of
Dave Click
Sent: Wednesday, July 03, 2013 6:26 AM
To: RE-wrenches
Subject: [RE-wrenches] EGC for Enphases
All,
I was just looking at small 4-module Andalay (Enphase 190) system
tying
into one of the Lennox solar-ready air conditioners. The engineer had
specified the 690.47(C) GEC be run directly from the array down to the
existing electrode. Running from the inverters is a 2+G wire to
the Lennox
panel; they are using the uninsulated ground as the circuit
neutral. It
seems to me that this violates 200.7 (grounded conductor marked
white or
grey). Also, 250.134(B) (EGC run with circuit conductors), about
which the
engineer states "I have been studying the NEC on this and I
believe that
the intent is to permit the ground to be carried with the current
carrying
conductors, not require."
Am I missing something?
Thanks,
Dave
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