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<p>Yes, microinverters and now I would think other typologies will
be included with module level disconnects becoming more common and
I guess required. So, as long as you can disconnect each non
microinverter individually, and microinverter strings by one
disconnect, you should meeting the intent. Labeling is key too.
I still think that this was a big error and the stated intention
of making rooftop pv safer has not been achieved. The wheel fell
off of this "safety improvement". Technology is catching up
though. Anyone on a roof better assume the array is live until
proven otherwise no matter what installation type it is. Chris <br>
</p>
<div class="moz-cite-prefix">On 2/25/2019 5:45 PM, Rebekah Hren
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CA+iiD9AUe=sYQRqeHGNbw0_du7h7ceGkVciFvi0j3DcDEJk8_g@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<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" moz-do-not-send="true">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" moz-do-not-send="true">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" moz-do-not-send="true">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>
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