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Old 06-05-2014, 03:15 PM   #1
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Hypothetical Melting question


If you have a 60 amp 2 pole breaker feeder a #4 Al SEU conductor going back to a disconnect on the furnace and the load b wasn't even tightened at all could that cause the main 60 to melt so bad that the plastic behind in drips down the buss bar without even having a sign of arcing in the disconnect ??

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Old 06-05-2014, 03:57 PM   #2
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Hypothetical Melting question


Was there a lightning strike?

For breaker housing to melt there needs a high heat source.

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Old 06-05-2014, 05:28 PM   #3
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Hypothetical Melting question


Cletis, just sell the customer a panel change and call it done. Whats going on in the disco has nothing to do with a 60amp breaker melting down, both you and I know that.

Last edited by Jump-start; 06-05-2014 at 05:31 PM.
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Old 06-05-2014, 11:39 PM   #4
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Hypothetical Melting question


Quote:
Originally Posted by Cletis
If you have a 60 amp 2 pole breaker feeder a #4 Al SEU conductor going back to a disconnect on the furnace and the load b wasn't even tightened at all could that cause the main 60 to melt so bad that the plastic behind in drips down the buss bar without even having a sign of arcing in the disconnect ??
Yes. Loose connections get hot, higher current loose connections get hotter. i^2R law. Heat of poor joint goes up with the square of the current. Replace damaged parts and check torque on all screws.
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Old 06-06-2014, 05:41 AM   #5
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Hypothetical Melting question


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Originally Posted by curiousB View Post
Yes. Loose connections get hot, higher current loose connections get hotter. i^2R law. Heat of poor joint goes up with the square of the current. Replace damaged parts and check torque on all screws.
Loose connection at device drawing 2 amps 50 ft away from breaker melting ? So, loose connection is not where the melting is happening. This is all hypothetical of course
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Old 06-06-2014, 07:12 AM   #6
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Hypothetical Melting question


More than one loose connection at work here.

Or a bad breaker.

Or a combination of things.
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Old 06-06-2014, 10:01 PM   #7
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Hypothetical Melting question


Only the loose connection will get hot, not some other part of the circuit. So check the area that melted and forget the rest.
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Old 06-07-2014, 04:16 AM   #8
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Hypothetical Melting question


[QUOTE=de-nagorg;1359735]Was there a lightning strike?

That was a Cletis strike.

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