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<span style="font-size: 11pt;">Ray is coming at this from an
electricians viewpoint. He is correct if talking about wiring
outside of a UL or ETL listed product. <br>
</span><br>
<span style="font-size: 11pt;">The reason for wide radii in wiring
is so the wires can be rerouted and terminated a few times. <br>
</span><br>
<span style="font-size: 11pt;">8 times the diameter is a very
large bend radii and would never fly inside a product, so why
can a manufacturer do it? <br>
</span><br>
<span style="font-size: 11pt;">Copper has the tendency to work
harden when bending back and forth. That will damage the current
carrying characteristics of a wire. <br>
</span><br>
<span style="font-size: 11pt;">Bending a wire once does not work
harden them. The insulation can get scrunched depending on the
actual bend radii, but it is <br>
</span><br>
<span style="font-size: 11pt;">only cosmetic after one tight bend.
There are no actual cracks that would jeopardize the insulation
integrity. <br>
</span><br>
<span style="font-size: 11pt;">We have investigated this and
determined it to be cosmetic in nature for a single bend. That
said, I don\u2019t like it either <br>
</span><br>
<span style="font-size: 11pt;">because it makes installers nervous
and doesn\u2019t look good. The tight wire bends are no different
from putting tight bends <br>
</span><br>
<span style="font-size: 11pt;">on a sheet metal copper busbar. We
do this all the time and always have. Testing shows that it does
not constrict electrical flow. <br>
</span><br>
<span style="font-size: 11pt;">If you straighten that same copper
busbar and bend it again, it is likely to break in half. That is
work hardening to the extreme. </span><br>
<span style="font-size: 11pt;">So, there is no violation from
tight wire bending inside a listed box. A listed box does not
have the same restrictions as the NEC. <br>
</span><br>
<span style="font-size: 11pt;">Believe me, I too do not like zero
radii bends and we have custom made pliers that give the wire a
gradual radii, but that is cosmetics only. <br>
</span><br>
<span style="font-size: 11pt;">The wire is not actually damaged
unless you straighten it up and re-bend it. We do not do that!</span><br>
<span style="font-size: 11pt;">Thanks,</span><br>
<span style="font-size: 11pt;">Robin Gudgel</span><br>
<span style="font-size: 11pt;">MidNite Solar</span></font><font
size="+3"><br>
<span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"></span></font><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><br>
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<div class="moz-cite-prefix">On 10/15/2018 11:27 AM, Will White
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CACdX-9nNudeHk0A8ZrsFiQV7Ks=ntpxRxvBx-fqX2+Wk0cADrQ@mail.gmail.com">
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<div dir="ltr">NEC doesn't apply to the interior components of a
UL listed device although I do see your point. I'm assuming they
designed it taking that bend into consideration.</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Mon, Oct 15, 2018 at 1:20 PM Ray <<a
href="mailto:ray@solarray.com" moz-do-not-send="true">ray@solarray.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Greetings;</p>
<p>I've noticed several of the factory wired power panels
over the years from Magnum, Outback, Midnite, Etc are not
compliant with NEC 300.34 wire bending radius. (Radius
should not be less than 8 times the diameter) Basically
they should look like sweep bends in PVC conduit, not
plumbing. Here's a pic from a recent Magnum system</p>
<p><img src="cid:part1.9F7CF1C5.D4F7E01B@solarray.com"
alt="" moz-do-not-send="true" height="479" width="582"></p>
<p>You can see the kinks in the insulation on the inside of
the bend, and the color fading on the outside from being
overstretched. Some might think this is neat work, but
its actually permanent wire damage and a code violation.
Imagine the strain on the copper inside. <br>
</p>
<p>Midnite is very proactive and has improved, I ask that
Magnum do the same and soon.</p>
<p>Thanks,<br>
</p>
<pre class="m_-6216361868692380616moz-signature" cols="72">--
Ray Walters
Remote Solar
303 505-8760</pre>
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<div dir="ltr"><b style="font-size:12.8px">Will
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