<div dir="ltr"><div>Sole connection indicates that a GEC is connected to only one type of grounding electrode. This term is easily mis- understood. For example, a GEC can be connected to more than one grounding electrodesay, two ground rodsand still be considered to have a sole connection. Similarly, multiple GECs connected to the same grounding electrode are each considered to have a sole connection. When GECs have a sole connection, their maximum size is limited per NEC Sections 250.66 for an ac system and 250.166 for a dc system. The 2014 NEC adds some clarification on this.</div>
<div><br></div><div class="gmail_extra"><div><div dir="ltr"><div>Brian Mehalic <br>NABCEP Certified Solar PV Installation ProfessionalR031508-59<div>IREC ISPQ Certified Affiliated Instructor/PV US-0132<br><div><br></div>
<div>PV Curriculum Developer and Instructor<div>Solar Energy International<br><a href="http://www.solarenergy.org" target="_blank">http://www.solarenergy.org</a></div></div></div></div></div></div>
<br><br><div class="gmail_quote">On Wed, Sep 18, 2013 at 4:52 PM, Aladdin Solar <span dir="ltr"><<a href="mailto:cpickard@aladdinsolar.com" target="_blank">cpickard@aladdinsolar.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<u></u>
<div lang="EN-US" link="blue" bgcolor="#ffffff" vlink="purple">
<div><font face="Arial">Yes, Jay,this is a TenKSolar system
--they certainly do havea habit of taking the 'thinking outside the
box' approach!</font></div>
<div><font face="Arial"></font></div>
<div><font face="Arial">The microinverter manufacturer states in their
installation manual, "Connect the grounding electrode conductor to the
microinverter ground clamp" so it'squite clear we are dealing with GEC
rules.</font></div>
<div><font face="Arial"></font></div>
<div><font face="Arial">Thanks for all your comments and the reminder of
the NEC 250.166(C) exception which I hadn't really connected with before.
</font></div>
<div><font face="Arial"></font></div>
<div><font face="Arial">I'm having difficulty understanding what the
requirement in that paragraph actually means. When it states "that portion of
the grounding electrode conductor that is the sole connection to the grounding
electrode shall not be required to be larger than 6AWG..." -- what does "that
portion" and "sole connection" mean? If we have a number of GEC branches from
that are irreversably spliced to a single 6AWGconductor bonded to the
grounding electrode, do those various GECs affect the "that portion" and "sole
connection" at all?</font></div><div class="im">
<div><font face="Arial"></font></div>
<div><font face="Arial">Charlie Pickard<br>NABCEP Certified PV Installation
Professional <br>Aladdin Solar, LLC</font></div>
<div><font face="Arial"></font></div>
<div><font face="Arial"></font></div>
</div><blockquote style="BORDER-LEFT:#000000 2px solid;PADDING-LEFT:5px;PADDING-RIGHT:0px;MARGIN-LEFT:5px;MARGIN-RIGHT:0px"><div><div class="h5">
<div style="FONT:10pt arial">----- Original Message ----- </div>
<div style="FONT:10pt arial;BACKGROUND:#e4e4e4"><b>From:</b>
<a title="billbrooks7@yahoo.com" href="mailto:billbrooks7@yahoo.com" target="_blank">Bill
Brooks</a> </div>
<div style="FONT:10pt arial"><b>To:</b> <a title="re-wrenches@lists.re-wrenches.org" href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">'RE-wrenches'</a> </div>
<div style="FONT:10pt arial"><b>Sent:</b> Wednesday, September 18, 2013 2:42
PM</div>
<div style="FONT:10pt arial"><b>Subject:</b> Re: [RE-wrenches] GEC sizing for
a high amp,low voltage PV system with microinverters</div>
<div><br></div>
<div>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">Nick,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">Thanks
for the clarificationit is a mysterious threaded hole.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt">Bill.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:'Calibri','sans-serif';COLOR:#1f497d;FONT-SIZE:11pt"><u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="FONT-FAMILY:'Calibri','sans-serif';FONT-SIZE:11pt">From:</span></b><span style="FONT-FAMILY:'Calibri','sans-serif';FONT-SIZE:11pt"> <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>
[mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Nick
Soleil<br><b>Sent:</b> Wednesday, September 18, 2013 10:19 AM<br><b>To:</b>
RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] GEC sizing for a high amp,
low voltage PV system with microinverters<u></u><u></u></span></p>
<p class="MsoNormal"><u></u><u></u></p>
<div>
<div>
<p style="MARGIN-BOTTOM:12pt" class="MsoNormal">Hi Bill and
wrenches,<u></u><u></u></p></div>
<p class="MsoNormal">To clarify, our new Enphase M250 microinverter does not
have a grounding terminal. The grounding of the M250 will be provided
through the Engage cable. We only have a hole in the lid, in the rare
case that a lug will be desired or required by the AHJ, but we do not provide
the grounding clip with the microinverter. A grounding terminal can be
added to the microinverter. We have an application note on alternate
grounding methods for the M250, if needed.<u></u><u></u></p></div>
<div>
<p style="MARGIN-BOTTOM:12pt" class="MsoNormal"><u></u><u></u></p></div><pre><u></u><u></u></pre></div><br><br></div></div>__________ Information from ESET
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