I have to disagree with Paul. That's the purpose of the Nye lubricant, to keep the air away and it will do that for a very long time.
Solder makes the crimp stiff so then what happens is that the strands just past the end of the crimp terminal are now brittle and don't bend. If the wire is flexing a lot (vibration from the motor) then strands break and you're right back where you started with the terminal heating.
Read these tech notes on the grease's properties
http://www.nyelubricants.com/pdf/NEW_8917_Marketing_WP.pdf
http://www.nyelubricants.com/pdf/nye_connector_lubes_v3.pdf
http://www.heavyequipmentforums.com/Forum/showthread.php?t=4394
"All electricians that work with high current and amps do have this type of grease.
They add it to the cables before crimping together to get good connection between the cable and crimped on shoes."
Crimp lugs are designed for crimping, not soldering. In the electrical world, it is not compliant to solder a crimp connection.
Or, go ahead and solder the lug. The insulation on the PIDG crimp terminal will melt and look awful, so cover it with shrink tubing.
Bob Landman
H&L Instruments, LLC
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Edwards
Sent: Wednesday, March 31, 2010 8:35 PM
To: [log in to unmask]
Subject: Re: [TN] Failed Ring Terminal
Bob,
I agree that it takes longer and is a pain to get it really nice but if it was soldered you might not have to be the one that has to fix it...
The next owner would...
Paul
Paul Edwards
Surface Art Engineering
-----Original Message-----
From: Robert Kondner [mailto:[log in to unmask]]
Sent: Wednesday, March 31, 2010 2:37 PM
To: 'TechNet E-Mail Forum'; Paul Edwards
Subject: RE: [TN] Failed Ring Terminal
Paul,
I agree. Soldering takes SO much longer and it can make a mess of the insulation, looks bad. But, if this terminal had been soldered it would still be working.
Though, 40 Years in my Dad's barn is more than I would asks of ANYTHING!
Bob Kondner
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Edwards
Sent: Wednesday, March 31, 2010 5:24 PM
To: [log in to unmask]
Subject: Re: [TN] Failed Ring Terminal
Bob,
A soldered crimp terminal is best for high reliability joints...
The surface of the individual strands of wire that makeup the conductor oxidize (and/or corrode) because they are exposed to the environment and increase the strand to strand resistance... As the current travels from the conductor core to the contact surface area of the crimp connector it differentially heats the strands in the conductor until you preferred current paths... The Cu then starts to thermal cycle under load and causes crystallization and failure of the Cu...
A solid solder joint eliminated this problem because of the soldered Cu interfaces are complete involved in the solder joint.
Paul
Paul Edwards
Surface Art Engineering
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Wednesday, March 31, 2010 12:55 PM
To: [log in to unmask]
Subject: [TN] Failed Ring Terminal
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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