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<p>This whole high voltage connection discussion got me searching,
and I found Phoenix Contact makes a DIN rail mount terminal block
that is 1000 v rated. That would seem to make way more sense than
using MC 4 connects in a J box, and would provide the access for
voltage readings and torque check that William mentioned. Has
anybody tried them?</p>
<p><a class="moz-txt-link-freetext" href="https://www.phoenixcontact.com/online/portal/us?1dmy&urile=wcm%3apath%3a/usen/web/main/products/subcategory_pages/Modular_terminal_blocks_for_photovoltaics_P-15-09/eb8c193d-6a2d-4349-8f89-2d523fd5b04f">https://www.phoenixcontact.com/online/portal/us?1dmy&urile=wcm%3apath%3a/usen/web/main/products/subcategory_pages/Modular_terminal_blocks_for_photovoltaics_P-15-09/eb8c193d-6a2d-4349-8f89-2d523fd5b04f</a><br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 5/7/21 8:47 PM, William Miller
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:21d21f58fb3c0220e750e712b5eabd96@mail.gmail.com">
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<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d">Friends:</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">Call
me old fashioned, but I cannot get any confidence on the
Wago connector. It seems somewhat akin to the back-wire
mechanism on a 15A receptacle. This connection relies on a
spring that is subject to reduction in force when it gets
hot. We have seen many of the back-wire receptacles heat up
and get more resistive as heat increases, creating more
heat, etc. </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">We
have learned when connecting battery cables to inverters or
batteries that the best connection does not have any washer
or any intermediate object between one conductor and the
other. </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
know wire nuts are not ideal (pun intended) but I like my
conductors to be in direct contact, or under a screw
terminal where I can determine and reconfirm the pressure
placed on the conductor. It is also necessary to have
control over the pressure applied to the connection, which
is why there are listed torque specs.</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">Yesterday
I was measuring the line voltage on an SB Series 22
inverter. This unit uses the Wago terminal. There was no
way I could get a meter probe into the Wago to measure line
voltage. I had to take the cover off the electronics
sections and measure voltage at the circuit board. I much
prefer a screw terminal I can adjust the torque and get a
meter probe onto it.</span></p>
<p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d">William
Miller</span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d">Miller
Solar</span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d">17395
Oak Road, Atascadero, CA 93422</span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d">805-438-5600</span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d"><a
href="http://www.millersolar.com/" moz-do-not-send="true"><span
style="color:blue">www.millersolar.com</span></a></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#1f497d">CA
Lic. 773985</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","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"">
RE-wrenches [mailto:<a
href="mailto:re-wrenches-bounces@lists.re-wrenches.org"
moz-do-not-send="true">re-wrenches-bounces@lists.re-wrenches.org</a>]
<b>On Behalf Of </b>Dan Fink<br>
<b>Sent:</b> Friday, May 7, 2021 4:01 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Wago Connectors (221
series)</span></p>
<p class="MsoNormal"> </p>
<div>
<div>
<p class="MsoNormal">Jason; From the Wago 221 data sheet,
it's listed to UL 486C, 600V, 30A, Use Group C
(industrial) . I have a copy of UL486C, and voltage is
just specified for dielectric testing. That standard
specifies tests with AC, because it is easier (and
cheaper) to generate and ramp up compared to DC, and DC
test platforms are relatively rare. </p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">So my interpretation of UL486C is that
because of AC voltage peaks compared to RMS (Vpeak = Vrms
x 1,414), a 1000VAC rated connector under UL486C would
need to be tested to 1414VDC. Working that math backwards,
a 600VAC rating would mean the DC dielectric rating would
be equivalent to 424.33 VDC.</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">How that would apply to AHJs asking you
questions, I do not know!</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
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<p class="MsoNormal"
style="vertical-align:baseline"><span
style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#222222;border:none
windowtext 1.0pt;padding:0in">Dan
Fink</span><span
style="font-family:"Calibri","sans-serif";color:black"></span></p>
</div>
<div>
<div>
<p class="MsoNormal"
style="vertical-align:baseline"><span
style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#222222">Owner,
Buckville Energy Consulting
LLC</span></p>
</div>
<div>
<p class="MsoNormal"
style="vertical-align:baseline"><span
style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#222222">IREC
Certified Instructor for PV
and Small Wind Installation</span></p>
</div>
<div>
<p class="MsoNormal"
style="vertical-align:baseline"><span
style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#222222">NABCEP
Certified PV System Inspector</span></p>
</div>
<div>
<p class="MsoNormal"
style="vertical-align:baseline"><span
style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#222222"><a
href="mailto:dan.fink@greendustrialtraining.com" target="_blank"
moz-do-not-send="true">d</a><a
href="mailto:anbob88@gmail.com" target="_blank" moz-do-not-send="true">anbob88@gmail.com</a></span></p>
</div>
<div>
<p class="MsoNormal"
style="vertical-align:baseline"><span
style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#222222">970-672-4342</span></p>
</div>
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<div>
<p class="MsoNormal">On Fri, May 7, 2021 at 3:43 PM Jason
Szumlanski <<a
href="mailto:jason@floridasolardesigngroup.com"
moz-do-not-send="true">jason@floridasolardesigngroup.com</a>>
wrote:</p>
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<p class="MsoNormal">In another thread these connectors
were discussed recently. There was a question
regarding the suitability for DC circuits. I don't
think we came up with any answers or consensus on
that. I see the connectors are UL listed to the 486C
standard. I can't determine whether that is applicable
to AC and DC circuits. Does anyone know?</p>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">I have only used these on AC
circuits and they have been very effective. Now I'm
curious whether they can be used on DC circuits up
to 600 volts. </p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">While on the subject, I noticed
they are UL 467 listed for grounding and bonding.
That's helpful where you have EGC splices for
conductors up to #10 AWG inside junction boxes. </p>
</div>
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<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">Jason Szumlanski</p>
</div>
<div>
<p class="MsoNormal">Florida Solar Design Group</p>
</div>
</div>
<p class="MsoNormal"> </p>
</blockquote>
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