[RE-wrenches] GEC for Enphase inverters

[Rebekah Hren]

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 <markf at berkeleysolar.com> wrote:

From: Mark Frye <markf at berkeleysolar.com>
Subject: Re: [RE-wrenches] GEC for Enphase inverters
To: "'RE-wrenches'" <re-wrenches at 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-bounces at lists.re-wrenches.org 
[mailto:re-wrenches-bounces at 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: william at millersolar.com
http://millersolar.com
License No. 
C-10-773985
 

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