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#118293 - 09/02/04 01:59 AM Should A Breaker Be 768 F?
iwire Offline
Moderator
Registered: 01/05/03
Posts: 4391
Loc: North Attleboro, MA USA
This is a Thermal Image of a Siemens bolt on panel from Capt. Al. The screw holding a single pole 20 amp breaker to the bus was loose.



The 409 C number is the temperature at the cross hairs.

Now this panel needs replacment, the copper bus for phase "B" is now gray.

Bob
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts
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#118294 - 09/02/04 05:45 AM Re: Should A Breaker Be 768 F?
electure Offline


Member
Registered: 12/24/00
Posts: 4259
Loc: Fullerton, CA USA
What seems amazing to me is the tiny area that appears to be so hot. Although you can see the heat on the BØ, it looks like the heat dissipates pretty well, considering the extreme temp.
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#118295 - 09/02/04 05:41 PM Re: Should A Breaker Be 768 F?
capt al Offline
Member
Registered: 06/20/04
Posts: 206
Loc: Norton, Ma USA
This was taken in a computer testing lab with plenty of Liebert A/C cooling the area. Probably helped the heat to dissipate. The lighter the blue color on "B" phase is the heat dissipating over the bus. Darker blue is a cooler temp.

The circuit fed a dedicated receptacle for computer equipment. The only problem was someone plugged six five foot plug strips into the dedicated circuit. "IT" guys just plug and play.
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#118296 - 09/03/04 06:20 PM Re: Should A Breaker Be 768 F?
DougW Offline
Member
Registered: 06/08/03
Posts: 1143
Loc: North Chicago, IL
Or should it be "plug and pray?"
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#118297 - 09/05/04 01:07 PM Re: Should A Breaker Be 768 F?
capt al Offline
Member
Registered: 06/20/04
Posts: 206
Loc: Norton, Ma USA
Doug, you are right. With "IT" guys it should be plug and pray. The above pic tells it all.
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