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<p>We use this 3M wire numbering dispenser. They don't stick as
well as I'd like, but it can solve some very weird problems
later. <br>
</p>
<p><img
src="https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Fimages.uline.com%2Fis%2Fimage%2Fcontent%2Fdam%2Fimages%2FH%2FH5500%2FH-5223.jpg%3F%24MediumRHD%24%26iccEmbed%3D1%26icc%3DAdobeRGB&f=1&nofb=1"
alt="3M STD Wire Marker Dispenser with #0-9 H-5223 - Uline"
width="329" height="329"></p>
<p>I'm also a fiend for color coding, and have had numerous
discussion here on the list about the need to color code wire.
Crossed wiring as Jason has illustrated to us, can be very
dangerous and lead to issues none of us could have predicted. Once
again, this situation would have easily been prevented by good
old labeling and color coding by the original installer Every
time I open a box and see unmarked black wires running every
where, or inconsistent colors, I know the entire installation is
suspect. <br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 1/23/20 2:28 PM, Jason Szumlanski
wrote:<br>
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<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">What made
this installation (again, by others) a bit more complicated
was that all branch circuit line conductors were black. I
make it a point on my installations to require black for L1
and red for L2 up to #6 wire size. It's not a failsafe by
any means but does reduce risk.</div>
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<div dir="ltr" class="gmail_attr">On Thu, Jan 23, 2020 at 2:41
PM August Goers <<a href="mailto:august@luminalt.com"
moz-do-not-send="true">august@luminalt.com</a>> wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
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<div dir="ltr">Jason -
<div><br>
</div>
<div>Thanks for sharing - this is a good lesson for all
Wrenches. Years ago we had a dual string inverter
installation where the DC positives and negatives were
mixed between the two interters. String 1 positive went
to inverter 1, string 1 negative went to inverter 2 and
vice versa. The inverters tested out and ran for about
two weeks and then one of them literally caught on fire.
Since then, we implemented a policy of checking wiring
coming from the roof down individually. In the case of
microinverter branch circuits, this means checking each
branch circuit voltage on the roof with the other
breakers off one branch at a time.</div>
<div><br>
</div>
<div>Not to get too far off on a tangent, but as we're
installing more and more energy storage with lots of
onsite wiring work, it is clear that fully testing
wiring is of utmost importance. We have a procedure for
checking voltage at each piece of equipment (such as a
backup loads panel, etc) prior to turning on branch
breakers. We've run into a couple of scenarios where
hots and neutrals were mixed up causing 240 v to go to a
120 v circuit. Not good.</div>
<div><br>
</div>
<div>August</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Jan 22, 2020 at
2:58 PM Jason Szumlanski <<a
href="mailto:jason@floridasolardesigngroup.com"
target="_blank" moz-do-not-send="true">jason@floridasolardesigngroup.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">
<div style="font-family:arial,helvetica,sans-serif">I
discovered the issue I believe, so I thought I'd
update all of you who gave me ideas on what to look
for (thank you).</div>
<div style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div style="font-family:arial,helvetica,sans-serif">And
this is something that I stress the importance of
all the time...</div>
<div style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div style="font-family:arial,helvetica,sans-serif">The
branch circuit pairs were not properly paired up!
All of the L1 conductors went to L1 on the bus and
all of the L2 to L2. However, for example, circuit 1
L1 and circuit 2 L2 were on a single 2-pole breaker.
And circuit 2 L1 and circuit 1 L2 were on another
breaker. Everything worked because it was
electrically connected to the right bus bar.
However, when there was a previous fault one of the
breakers probably didn't trip when it should have as
a result of the improper pairings. It was reset a
few times and just kept heating up and heating up.</div>
<div style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div style="font-family:arial,helvetica,sans-serif">This
isn't conclusive, but it sure makes sense. It wasn't
fun tracking this down with 5 strings and 5 junction
boxes on the roof, but once we started continuity
testing and finding strange results, it became
clear.</div>
<div style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div style="font-family:arial,helvetica,sans-serif">Jason
Szumlanski</div>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Jan 21, 2020
at 12:10 PM Jason Szumlanski <<a
href="mailto:jason@floridasolardesigngroup.com"
target="_blank" moz-do-not-send="true">jason@floridasolardesigngroup.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">
<div
style="font-family:arial,helvetica,sans-serif">(System
installed by another contractor...)</div>
<div
style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div
style="font-family:arial,helvetica,sans-serif">I
have been tasked with assisting in the
investigation of damage in a subpanel used to
combine inverter output circuits (5 strings of
microinverters). There appears to be no damage
to conductors or other system components. It
looks like the damage started at the stabs of
the bus bar where the breakers connect. Picture
attached. Here are a few clues:</div>
<div
style="font-family:arial,helvetica,sans-serif">
<ul>
<li>Monitoring indicates that damage
occurred overnight a few weeks ago. That
night we had rain as a winter front came
through Florida, possibly lightning. The
prior day everything was fine.</li>
<li>The next morning, only 2 of 5 strings
started producing power, but 4 of 5 strings
were reporting data to the Envoy. The two
strings that were reporting but not
producing power reported 0Vac and Voc on the
DC side of the microinverters. </li>
<li>A couple of weeks later, 1 of the 2
strings that was producing power quit doing
so, but continued reporting data.</li>
<li>Customer discovered damage yesterday.</li>
<li>About a week before the initial damage
apparently manifested itself, another
contractor installed a whole house generator
transfer switch on the line side of the PV
interconnection. The generator has never
been run (there is not even a LP fuel source
on site yet). I pointed out that the solar
interconnection, which was previously on the
supply side, would need to be moved to the
supply side of the generator transfer
switch's main breaker before operation.
During the transfer switch installation, the
contractor also switched line 1 and line 2,
but that shouldn't really matter, except for
Enphase consumption monitoring, which was
messed up by the swapping of the lines.</li>
</ul>
<div>So I'm looking for ideas. I'm wondering if
the OCPD would be a likely place for lightning
damage to manifest itself. I can't visually
detect any other damage anywhere else. I can't
imagine that the transfer switch installation
would have anything to do with it, but the
timing is interesting. Other than replacing
the subpanel and OCPD and firing it back up
(no pun intended), I'm not sure how to
approach further investigation.</div>
<div><br>
</div>
<div>Jason Szumlanski</div>
<div>Florida Solar Design Group</div>
</div>
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