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March 2010

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From:
Robert Kondner <[log in to unmask]>
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Date:
Wed, 31 Mar 2010 15:54:32 -0400
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Hi,

 

 Why would a crimped ring terminal fail and over heat?  Can anyone suggest
failure modes as to why the resistance would increase? 

 

 I would guess a soldered connection would be better?

 

 See www.kondner.com/files/failedringterm.jpg

 

 That insulator was yellow at one time it is now brown and the insulation at
that end of the wire is very brittle. The wire size is #10.

 

 This ring terminal came from a Furnas Electric motor starter for a 5hp 240V
AC motor that draws about 28 amps. It was installed back in 1968. It was
installed in a dingy barn in a silo pit where most of the steel enclosures
are covered with rust. All kinds of nasty odors as there are plenty of cows
in the area. It is quite amazing that it went this long, but I wonder why it
failed.

 

 The crimp seemed tight but it had obviously over heated. Other such ring
terminal on the same circuit are fine. The crimps were made in the factory
and not by some guy with a simple hand tool.

 

 I ground off the edges which allowed me to open the crimp with minimal wire
damage. I was surprised that much of the wire looked quite clean.

 

 I am just curious what folks would suggest.

 

Thanks,

Bob Kondner

 

 

 



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