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<p>If you live by the language, and there are multiple
interpretations of the language, then you need to follow the AHJ
since they have ultimate authority. Probably many people on this
list have been involved in discussion of interpreting the NEC.
That's one of the functions of the WRENCHES listserv. I've
inspected many systems for various entities, and with regard to
string inverters, they require their own disconnecting means and
have for many code cycles.. If you think that it says that
multiple inverters may only be interconnected by one OCPD, then I
would verify with AHJ and follow what he/she requires. I could
read your citation that each inverter shall be made at a dedicated
circuit breaker. That's my interpretation. The 2014 is known to
have a number of problems. The NEC also suggests that you use best
practices. Chris Warfel<br>
</p>
<div class="moz-cite-prefix">On 2/26/2019 12:42 AM, William Miller
wrote:<br>
</div>
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<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">August:</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">The
2014 code, which the AHJ for this project is using, states
the following:</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">(<i>1)
Dedicated Overcurrent and Disconnect. The source</i></span></p>
<p class="MsoNormal"><i><span
style="font-family:"Verdana","sans-serif";color:#1f497d">interconnection
of one or more inverters installed in one</span></i></p>
<p class="MsoNormal"><i><span
style="font-family:"Verdana","sans-serif";color:#1f497d">system
shall be made at a dedicated circuit breaker or fusible</span></i></p>
<p class="MsoNormal"><i><span
style="font-family:"Verdana","sans-serif";color:#1f497d">disconnecting
means.</span></i></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">Note
that the language says, \u201cThe source interconnection\u2026\u201d
(singular), and \u201cat a dedicated circuit breaker\u2026\u201d(again
singular). This makes it obvious to me that the language
says that the outputs of multiple inverters need to be
aggregated and connected via <u>one</u> OCPD. I think the
other wrenches missed this point.</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">Your
input is valuable by contrasting the language of the 2014
code with that of the 2017 version. The inclusion of the
phrase \u201cEach source\u2026\u201d in the 2017 code completely changes
the meaning. Some AHJs will look to future code versions
for clarity even if they are not yet adopted. I think this
is a good thing, and I really appreciate you bringing up the
new language.</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">The
article from AEIA magazine ratifies the conclusion I drew
from the 2014 code. Fortunately the AHJ is misinterpreting
the section to allow the more liberal interpretation, the
one that the 2017 code reflects. I find it best to contact
the plan checker directly, which I did, and we are approved
for multiple OCPDs. By the way, I think that article is
well written and I have book marked it.</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">I
don\u2019t know if the 2014 language was a mistake corrected in
2107, or what the thinking was of the authors. Regardless,
we live by the language, not the intent.</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">Thank
you as well to all who responded.</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">William
Miller</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
August Goers [mailto:<a href="mailto:august@luminalt.com"
moz-do-not-send="true">august@luminalt.com</a>] <br>
<b>Sent:</b> Monday, February 25, 2019 9:07 AM<br>
<b>To:</b> William Miller; RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Multiple inverters</span></p>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal">Hi William - </p>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">In this case, it is helpful to look
forward to the 2017 NEC for guidance:</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<div>
<p class="MsoNormal"><img id="_x0000_i1025"
src="cid:part2.80B919F0.32AA0061@entech-engineering.com"
alt="image.png" class="" width="440" height="402"></p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">I believe it's perfectly fine to have
multiple inverter breakers in your main.</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">August</p>
</div>
<div>
<p class="MsoNormal">Luminalt</p>
</div>
<p class="MsoNormal"> </p>
</div>
</div>
<p class="MsoNormal"> </p>
<div>
<div>
<p class="MsoNormal">On Mon, Feb 25, 2019 at 8:42 AM William
Miller <<a href="mailto:william@millersolar.com"
moz-do-not-send="true">william@millersolar.com</a>>
wrote:</p>
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<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">Friends:</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">I have an
NEC code question on an upcoming project. It is a
home that has an existing 8 kW ground-mounted
grid-tied system. The owner wants to add another 10
kW of grid-tied PV. My question is about 705.12,
point of connection. Specifically section (D)(1).
That section states: </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i><span
style="font-family:"Verdana","sans-serif"">The
source interconnection of one or more inverters
installed in one system shall be made at a
dedicated circuit breaker or fusible disconnecting
means.</span></i></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">So if
there are going to be two inverters on premise, do
the outputs have to be aggregated to connect via one
circuit breaker? This might be difficult to do as
the exiting inverter is connected via a different
sub-panel than the one that is planned to receive
the new inverter output.</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">This <a
href="https://iaeimagazine.org/magazine/2014/01/16/load-side-pv-connections/"
target="_blank" moz-do-not-send="true">article</a>
addresses the question.</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">I would
be very grateful if any of you can share any
experience you might have in interpreting this
section of the code.</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">Thanks in
advance.</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif"">William</span></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Verdana","sans-serif""> </span></p>
</div>
</div>
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<font face="PMingLiU-ExtB">
Christopher Warfel</font><br>
<font face="PMingLiU-ExtB"> ENTECH
Engineering, Inc.</font><br>
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