Yes, we have been taking the approach Rebekah describes and treat the grounding
conductor from the Enphase as GEC: Continuous #6 copper from the Enphase
installed grounding clamp all the way back to the Grounding Electrode. The
irreversable splices can be a bother compared to using a Polaris or similar but
AHJs have been very happy with this approach (so far).
Charlie Pickard
Aladdin Solar
Excelsior, MN 55331
cpick...@aladdinsolar.com
www.AladdinSolar.com
----- Original Message -----
From: Rebekah Hren
To: RE-wrenches
Sent: Tuesday, September 14, 2010 9:25 AM
Subject: Re: [RE-wrenches] GEC for Enphase inverters
The code does require the GEC to be continuous (250.64C), and I believe
that the AC EGC for the Enphase metal inverter cases is in fact the same as the
DC GEC since the point of system bonding on the DC side is inside the inverter.
See art. 100 definitions:Grounding Electrode Conductor. A conductor
used to
connect the system grounded conductor...to a point on the grounding
electrode
system.
So this means that for Enphase systems the AC EGC (which is also the DC
GEC) should be at minimum 8 awg (250.66) and continuous? Seems like it to me.
Rebekah Hren
--- On Tue, 9/14/10, Mark Frye <ma...@berkeleysolar.com> wrote:
From: Mark Frye <ma...@berkeleysolar.com>
Subject: Re: [RE-wrenches] GEC for Enphase inverters
To: "'RE-wrenches'" <re-wrenches@lists.re-wrenches.org>
Date: Tuesday, September 14, 2010, 10:05 AM
I believe the AC GEC runs from; the point where the ungrounded
current carrying conductor is bonded to the enclosure of the service enterance
equipment; to the connection to the ground electrode system. Conductors that
run from the service enterance equipment, thru the premis to the Enphase are
bonding jumpers that are not required to be continuous.
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City, CA 95959
(530) 401-8024
www.berkeleysolar.com
----------------------------------------------------------------------
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of William Miller
Sent: Monday, September 13, 2010 9:46 PM
To: RE-wrenches
Subject: [RE-wrenches] GEC for Enphase inverters
Friends:
According to the 2005 NEC 250.64(C), the GEC for an AC system needs
to be continuous without splices unless they are irreversible. I am not clear
where this conductor starts and ends. Is it from the ground buss in a
sub-panel to the disconnect switch on the roof, or to each inverter?
Also, non-reversible splices need to be listed for use in grounding
systems. Any suggestions on make and model of splices so listed?
Any advise from those more experienced is much appreciated.
William Miller
Please note new e-mail address and domain:
William Miller
Miller Solar
Voice :805-438-5600
email: will...@millersolar.com
http://millersolar.com
License No. C-10-773985
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