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.
Ray
On 11/18/2011 1:47 PM, Nik Ponzio wrote:
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.
On Wed, Nov 16, 2011 at 11:01 PM, Darryl Thayer <daryl_so...@yahoo.com
<mailto:daryl_so...@yahoo.com>> 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 <mailto:r...@solarray.com>>
*To:* RE-wrenches <re-wrenches@lists.re-wrenches.org
<mailto: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
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