[RE-wrenches] EGC for Enphases
Dave Click
daveclick at fsec.ucf.edu
Wed Jul 10 19:25:13 PDT 2013
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" <august at luminalt.com
> <mailto:august at 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-bounces at lists.re-wrenches.org
> <mailto:re-wrenches-bounces at lists.re-wrenches.org>
> [mailto:re-wrenches-bounces at lists.re-wrenches.org
> <mailto:re-wrenches-bounces at 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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