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Was that on the hots or neutral? It's possible that might have been
lightning too. I've heard of lightning using the pump wiring to get
to the very well grounded well water.<br>
<br>
Ray<br>
<br>
On 11/18/2011 1:47 PM, Nik Ponzio wrote:
<blockquote
cite="mid:CADR8m8jnHTPgF=-Lyiz0PFMNv=Hqj7RG26-Gkx08WZJq6MNUMg@mail.gmail.com"
type="cite"> I had an off-grid customer report that their huge
well pump surge caused an insulation melt-down at a tight bend in
the wire. <br>
<br>
<br>
<div class="gmail_quote">On Wed, Nov 16, 2011 at 11:01 PM, Darryl
Thayer <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:daryl_solar@yahoo.com">daryl_solar@yahoo.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>
<div
style="color:#000;background-color:#fff;font-family:arial,
helvetica, sans-serif;font-size:12pt">
<div><span>I have seen the lightening damage at tight
bends, but in my electrical career of 60+ years I have
not seen any other</span></div>
<div><span>problems. </span></div>
<div><span>Darryl </span></div>
<div><br>
</div>
<div style="font-family:arial, helvetica,
sans-serif;font-size:12pt">
<div style="font-family:times new roman, new york,
times, serif;font-size:12pt">
<font face="Arial" size="2"><b><span
style="font-weight:bold">From:</span></b> Ray
Walters <<a moz-do-not-send="true"
href="mailto:ray@solarray.com" target="_blank">ray@solarray.com</a>><br>
<b><span style="font-weight:bold">To:</span></b>
RE-wrenches <<a moz-do-not-send="true"
href="mailto:re-wrenches@lists.re-wrenches.org"
target="_blank">re-wrenches@lists.re-wrenches.org</a>><br>
<b><span style="font-weight:bold">Sent:</span></b>
Wednesday, November 16, 2011 12:11 PM<br>
<b><span style="font-weight:bold">Subject:</span></b>
Re: [RE-wrenches] 90 degree wire bends<br>
</font>
<div>
<div class="h5"><br>
<div>
<div> It seems that if the strands were
stretched and therefore thinned, that that
would increase resistance, some. I think more
importantly, the insulation bunchs up and
cracks, and is definitely compromised. Also
with strain hardening of copper, I'm sure some
strands could break internally with a tight
enough bend. I've heard at least for bare
ground wires that lightning will jump off to
the case at tight bends, but I've never
actually seen that. <br>
Aside from all that, is there actually an
increased impedance from a tight bend (like in
plumbing)? I don't know. <br>
I've had to stop more than one journeyman from
violating 300.34. I just tell them the bends
should look like the long sweeps in conduit
relative to the diameter of the wire: also
purdy.<br>
<br>
Aloha,<br>
<br>
Ray<br>
<br>
On 11/16/2011 10:35 AM, Marco Mangelsdorf
wrote:
<blockquote type="cite">
<div>
<div>Some electricians have great fun in
making 90 degree wire bends to try and
make their enclosure wiring look so
purdy.</div>
<div> </div>
<div>Given the importance of maintaining
wiring radiuses, this can’t be a good
idea, can it? Is the issue greater
resistance when the wire is bent at a
straight 90 degrees (or more)?</div>
<div> </div>
<div>Thanks,</div>
<div>marco</div>
<div> </div>
</div>
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