<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">BANG. <div>500 megajoules running through a wire at the speed of light. The poor little wire is doing the best is can to transmit the power, creating a freight train of spiraling, magnetic fields along the way. A tight bend, creating high inductance, looks like a 8 foot thick concrete wall. BANG. This time as the energy explodes from the wire to find a path of lesser resistance. That about sums it up.</div><div><br></div><div>I love it when I see "lightning protection" installations with neatly formed wires following every turn and contour tightly. Bang.</div><div><div><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br class="Apple-interchange-newline">Larry Crutcher</div><div>Starlight Solar Power Systems</div><div><br></div></div></span></span><br class="Apple-interchange-newline">
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<br><div><div>On Nov 16, 2011, at 9:01 PM, Darryl Thayer wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><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 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 <<a href="mailto:ray@solarray.com">ray@solarray.com</a>><br><b><span style="font-weight: bold;">To:</span></b> RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">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><br>
<div id="yiv373147329">
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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>
<div class="yiv373147329MsoNormal"> </div>
<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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