BANG. 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.
I love it when I see "lightning protection" installations with neatly formed wires following every turn and contour tightly. Bang. Larry Crutcher Starlight Solar Power Systems On Nov 16, 2011, at 9:01 PM, Darryl Thayer wrote: > I have seen the lightening damage at tight bends, but in my electrical career > of 60+ years I have not seen any other > problems. > Darryl > > From: Ray Walters <r...@solarray.com> > To: RE-wrenches <re-wrenches@lists.re-wrenches.org> > Sent: Wednesday, November 16, 2011 12:11 PM > Subject: Re: [RE-wrenches] 90 degree wire bends > > 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. > Aside from all that, is there actually an increased impedance from a tight > bend (like in plumbing)? I don't know. > 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. > > Aloha, > > Ray > > On 11/16/2011 10:35 AM, Marco Mangelsdorf wrote: >> >> Some electricians have great fun in making 90 degree wire bends to try and >> make their enclosure wiring look so purdy. >> >> 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)? >> >> Thanks, >> marco >> >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Options & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out participant bios: >> www.members.re-wrenches.org >> > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
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