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<DIV dir=ltr align=left><FONT color=#0000ff size=2 face=Arial><SPAN
class=968255317-14092010>"<FONT size=3><FONT color=#1f497d><FONT
face=Calibri>Since the GEC for Enphase starts at the inverter on the roof, you
must have a minimum of 8AWG running among the microinverters and down to the
grounding electrode system. In the 2008 NEC and 2011 NEC, this conductor can
serve the purpose of the ac EGC as well and can be terminated on the service
panel grounding bus."</FONT></FONT></FONT></SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#1f497d size=3 face=Calibri><SPAN
class=968255317-14092010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#1f497d size=3 face=Calibri><SPAN
class=968255317-14092010>Yes, but this conductor does not need to be "unboken",
correct?</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT color=#1f497d size=3 face=Calibri><SPAN
class=968255317-14092010></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT color=#1f497d size=3 face=Calibri><SPAN
class=968255317-14092010>This conductor, running among the microinverters can be
terminated onto a mechanical pressure terminal which serves as the equipment
ground buss in a load center which is not part of service enterance equipment
and may be located anywhere on the premise. The remainder of the circuit is then
provided by the EGC as it runs back to the service enterance and then the GEC to
the GES. Correct?</SPAN></FONT></DIV><!-- Converted from text/rtf format -->
<P><SPAN lang=en-us><FONT face=Arial></FONT></SPAN> <BR><SPAN lang=en-us><FONT
size=2 face=Arial>Mark Frye</FONT></SPAN> <BR><SPAN lang=en-us><FONT size=2
face=Arial>Berkeley Solar Electric Systems</FONT></SPAN> <BR><SPAN
lang=en-us><FONT size=2 face=Arial>303 Redbud Way</FONT></SPAN> <BR><SPAN
lang=en-us><FONT size=2 face=Arial>Nevada City, CA 95959</FONT></SPAN>
<BR><SPAN lang=en-us><FONT size=2 face=Arial>(530) 401-8024</FONT></SPAN>
<BR><SPAN lang=en-us></SPAN><A href="http://www.berkeleysolar.com/"><SPAN
lang=en-us><U><FONT color=#0000ff size=2
face=Arial>www.berkeleysolar.com</FONT></U></SPAN></A><SPAN lang=en-us><FONT
size=2 face=Arial> </FONT></SPAN> </P>
<DIV> </DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>Bill
Brooks<BR><B>Sent:</B> Tuesday, September 14, 2010 8:41 AM<BR><B>To:</B>
'RE-wrenches'<BR><B>Subject:</B> Re: [RE-wrenches] GEC for Enphase
inverters<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Mark
and Rebekah,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">The
term “continuous” is a requirement for any circuit and implies electrical
continuity and current-carrying capability. Both the GEC and EGC must be
continuous or you don’t got one. It is not defined in NEC Article
100.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">What
most people are referring to when they say that a GEC must be continuous is
“unbroken” or the NEC talks about “irreversibly spliced.” Splicing of a GEC is
usually a last resort because there is no other option. For instance, multiple
bonding jumpers coming off of multiple inverters would need to be irreversibly
spliced to the main GEC that should proceed unbroken from the farthest inverter
from the grounding electrode. 250.66 for ac and 250.166 for dc are consistent in
requiring the minimum GEC to be 8AWG copper. Since the GEC for Enphase starts at
the inverter on the roof, you must have a minimum of 8AWG running among the
microinverters and down to the grounding electrode system. In the 2008 NEC and
2011 NEC, this conductor can serve the purpose of the ac EGC as well and can be
terminated on the service panel grounding bus.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Bill.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
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<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>Rebekah
Hren<BR><B>Sent:</B> Tuesday, September 14, 2010 7:25 AM<BR><B>To:</B>
RE-wrenches<BR><B>Subject:</B> Re: [RE-wrenches] GEC for Enphase
inverters<o:p></o:p></SPAN></P></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<TABLE class=MsoNormalTable border=0 cellSpacing=0 cellPadding=0>
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style="PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; PADDING-TOP: 0in"
vAlign=top>
<P class=MsoNormal>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. <o:p></o:p></P>
<DIV>
<P class=MsoNormal>See art. 100 definitions:<B>Grounding Electrode
Conductor. A conductor used to</B><o:p></o:p></P></DIV>
<P class=p1><B>connect the system grounded conductor...to a point on the
grounding electrode</B><o:p></o:p></P>
<P class=p1><B>system.</B><o:p></o:p></P>
<DIV>
<P class=MsoNormal><BR>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. <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><o:p> </o:p></P>
<DIV>
<P class=MsoNormal>Rebekah Hren<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><o:p> </o:p></P>
<DIV>
<P class=MsoNormal><BR><BR>--- On <B>Tue, 9/14/10, Mark Frye
<I><markf@berkeleysolar.com></I></B> wrote:<o:p></o:p></P>
<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal><BR>From: Mark Frye
<markf@berkeleysolar.com><BR>Subject: Re: [RE-wrenches] GEC for
Enphase inverters<BR>To: "'RE-wrenches'"
<re-wrenches@lists.re-wrenches.org><BR>Date: Tuesday, September 14,
2010, 10:05 AM<o:p></o:p></P>
<DIV id=yiv1974489623>
<P class=MsoNormal><SPAN class=yiv1974489623468365813-14092010><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: blue; FONT-SIZE: 10pt">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.</SPAN></SPAN><o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">Mark
Frye</SPAN> <BR><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">Berkeley Solar
Electric Systems</SPAN> <BR><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">303 Redbud
Way</SPAN> <BR><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">Nevada
City, CA 95959</SPAN> <BR><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">(530)
401-8024</SPAN> <BR><A href="http://www.berkeleysolar.com/"
target=_blank><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt">www.berkeleysolar.com</SPAN></A><SPAN
style="FONT-FAMILY: 'Arial','sans-serif'; FONT-SIZE: 10pt"> </SPAN>
<o:p></o:p></P>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<DIV style="TEXT-ALIGN: center" class=MsoNormal align=center>
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<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of
</B>William Miller<BR><B>Sent:</B> Monday, September 13, 2010 9:46
PM<BR><B>To:</B> RE-wrenches<BR><B>Subject:</B> [RE-wrenches] GEC for
Enphase inverters</SPAN><o:p></o:p></P>
<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal>Friends:<BR><BR>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?<BR><BR>Also, non-reversible splices need to be listed for use in
grounding systems. Any suggestions on make and model of splices so
listed?<BR><BR>Any advise from those more experienced is much
appreciated.<BR><BR>William Miller<o:p></o:p></P>
<P><U>Please note new e-mail address and domain:<BR><BR></U>William Miller
<BR>Miller Solar<BR>Voice :805-438-5600<BR>email:
william@millersolar.com<BR><A href="http://millersolar.com/"
target=_blank>http://millersolar.com<BR></A>License No.
C-10-773985<o:p></o:p></P></DIV>
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