<html><body><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 size="2" face="Arial"><div style="margin: 5px 0px; padding: 0px; border: 1px solid rgb(204, 204, 204); height: 0px; line-height: 0; font-size: 0px;" class="hr" contentEditable="false" readonly="true"></div><b><span style="font-weight: bold;">From:</span></b> Ray Walters <ray@solarray.com><br><b><span style="font-weight: bold;">To:</span></b> RE-wrenches <re-wrenches@lists.re-wrenches.org><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><br>
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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:
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<div class="yiv373147329MsoNormal">Some electricians have great fun in making
90 degree wire
bends to try and make their enclosure wiring look so purdy.</div>
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<div class="yiv373147329MsoNormal">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>
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<div class="yiv373147329MsoNormal">Thanks,</div>
<div class="yiv373147329MsoNormal">marco</div>
<div class="yiv373147329MsoNormal"> </div>
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