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1. 05:29 PM - Re: Re: Butt Splice for #4 wire (Robert L. Nuckolls, III)
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| Subject: | Re: Butt Splice for #4 wire |
At 07:49 AM 4/9/2013, you wrote:
<johngoodman@earthlink.net>
>The #4 looked fine as I removed the nut, but as soon as a pulled it
>off the lug, the terminal was only hanging on by a couple of thin
>wires and a small >piece of the heatshrink. The only thing that had
>been keeping it together was the heatshrink and the natural
>propensity of the wire to stay in place.
>My only explanation is that the 7", or so, of cable between the terminal
>end and the first adel clamp, had enough weight and motion to respond
>to vibrations, and eventually fatigue the cable.
John sent me the carcass and we've had a chance to
peek inside the failure . . .
Emacs!
95% of the strands failed right outside the crimp . . . a
telltale for insufficient insulation support like that offered by
PIDG style terminals.
A cross-section of the wire grip . . .
Emacs!
. . . showed good crush . . . no voids. I'm pretty sure that
a piece of that extra stiff, two-walled heat-shrink over this assembly
would have produced a better story.
Bob . . .
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