<div dir="ltr">I should follow up to say that yes Chris is correct - each inverter does require its own equipment disconnects (AC and DC) per 690.15, but those can be connectors, like for Enphase, or any number of other things, as detailed in 690.15. If you try to keep system and equipment disconnect rules separate in your mind, I think it helps - although of course the inverter AC disconnect for a string inverter will often also be serving as the system disconnect, so there is a lot of overlap. <div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Feb 25, 2019 at 5:39 PM Rebekah Hren <<a href="mailto:rebekah.hren@gmail.com" target="_blank">rebekah.hren@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi Chris and William<div> <span style="font-family:Calibri,sans-serif;font-size:12pt">There was certainly no intention to mandate that all
inverters connect to one OCPD/disconnect.But 705.12(B)(1) in 2017 clarifies that systems like Enphase could have
multiple inverters on one breaker, certainly not that all inverters in a building have to
be on breaker.</span></div>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"> </p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">If an AHJ raises this issue the answer is as follows: </p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"> </p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">A single inverter can be called a single PV system - see the diagrams in 690.1(b). A
building can have multiple PV systems per 690.4(D). </p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">Each PV system can have no more than 6 system disconnect
switches per 690.13(D). Circuit breakers are allowed as PV system disconnects - 690.13(F)(1). </p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">There is no limit to the number of PV systems allowed on a
building. </p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"> </p>
<p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">Therefore, each inverter can be connected to its own breaker/disco for that PV system. </p><p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><br></p><p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">A few further comments :</p><p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">A single PV system can have a single inverter, or multiple inverters. It is up to you to define the system and the PV system disconnect(s) associated with it. </p><p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">OR multiple inverters (power sources) can be connected to a single OCPD/disco up to the manufacturer's maximum OCPD limit, per 705.12(B)(1). </p><p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">OR multiple (let's say 10) inverters in a single system can each have their own OCPD/disco and ONE master PV system disconnect for all 10 inverters to follow the fules of 690.13(D). </p><p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><br></p><p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">Lots of options, all allowed! </p><p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif"><br></p><p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">Best, </p><p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">Rebekah</p><p class="MsoNormal" style="margin:0in 0in 0.0001pt;font-size:12pt;font-family:Calibri,sans-serif">Principal, CMP-4</p></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Feb 25, 2019 at 5:31 PM Christopher Warfel <<a href="mailto:cwarfel@entech-engineering.com" target="_blank">cwarfel@entech-engineering.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p>Just reading more slowly, each inverter has to be on its on
separate disconnect means. You cannot put multiple inverters on
the same disconnecting means unless there are individual
disconnecting means upstream. <br>
</p>
<div class="gmail-m_-3045304970565992842gmail-m_2761290747993236591gmail-m_-3921330171949623308moz-cite-prefix">On 2/25/2019 10:53 AM, William Miller
wrote:<br>
</div>
<blockquote type="cite">
<div class="gmail-m_-3045304970565992842gmail-m_2761290747993236591gmail-m_-3921330171949623308WordSection1">
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">Friends:</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:12pt;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"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p>
<p class="MsoNormal"><i><span style="font-size:12pt;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"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:12pt;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"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">This
<a href="https://iaeimagazine.org/magazine/2014/01/16/load-side-pv-connections/" target="_blank">article</a> addresses the question.</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:12pt;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"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">Thanks
in advance.</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">William</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p>
</div>
<br>
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