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Thread: Hot breaker in a panel
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06-15-2022, 02:21 PM #1
Hot breaker in a panel
Experimenting with my new infrared camera and took a look at a power panel. The hot water breaker was up to 93 degrees while everything else was around 78 degrees. My question is how hot must a breaker be before you call it out as too hot?
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06-15-2022, 03:30 PM #2
Re: Hot breaker in a panel
First: I don't know.
Second, rule ff thumb: if it's "Ouch!" hot, I don't trust it, unless it's inherently lossy, like a light, heater, perhaps transformer.
Third, if the CB is marked 60/75 deg C, it's supposed to handle that temperature, which is wa-ay higher than you measured. Tested at 100% rated load, the parts you can touch aren't supposed to exceed 60 deg C after it achieves equilibrium.
Fourth, to confuse matters, tests in the standard can be destructive.
And fifth, I love new toys, but if an ammeter says it's handling the load the heater says it should supply, and the CB doesn't give you other indications of something being wrong, a' wouldna be worrit now.
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06-16-2022, 04:35 AM #3
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06-16-2022, 06:31 AM #4
Re: Hot breaker in a panel
Right you are, Dom. Of course, the ish here most likely is "is there abnormal temperature rise?" rather than "Is this breaker about to self-destruct?"
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06-17-2022, 02:21 AM #5
Re: Hot breaker in a panel
RH
waving the magic wand requires more training & data than you furnished for any factual temperature evaluations
see attached for the basics for performing electrical ir evaluation
CPSC announced a Schneider Electric recall recently...
https://www.cpsc.gov/Recalls/2022/Sc...YA6PGHQneGwXsA
Last edited by BARRY ADAIR; 06-17-2022 at 02:33 AM.
badair http://www.adairinspection.com Garland, TX 75042
Commercial-Residential-Construction-EIFS-Stucco-ACMV-Infrared Thermography
life is the random lottery of events followed by numerous narrow escapes...accept the good
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06-17-2022, 03:48 AM #6
Re: Hot breaker in a panel
That is a nice little document from Schneider/Sq D, Barry. Even so, I'm sure it's no substitute for a good class. Now I don't know that the greatly revamped standard-in-the-making that 70B has become offers a great deal more to help with IR surveys.
I do like its point about documenting other evidence of deterioration. I hope they didn't t need to add, "But don't let your nose touch an energized component."
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06-17-2022, 05:04 AM #7
Re: Hot breaker in a panel
DS
never imagined you as being 1 for nose envy ;~}
my point was ir is not point-shoot & done, i know you get this
much more is required for a factual electrical analysis w/ir & most inspector assoc. do not stress this enough, thus the spate of ineffectual wand wavers
badair http://www.adairinspection.com Garland, TX 75042
Commercial-Residential-Construction-EIFS-Stucco-ACMV-Infrared Thermography
life is the random lottery of events followed by numerous narrow escapes...accept the good
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06-17-2022, 05:53 AM #8
Re: Hot breaker in a panel
Realistically, friends, it seems that IR analysis of electrical equipment focuses on ongoing maintenance programs. 70B-that-is-to-be does not even include SFRs, though the CMP agreed to take proposals and comments to add them as input for the next edition.
This said, years ago, Dr. Bruce Moore, then with Met Labs, came in to provide a second opinion on a consult. He brought a load bank and IR camera, neither of which I had used. While he largely seconded my findings, he added a big bang to the "open it up!" by finding a hot, buried air splice with the camera.
The point: sometimes the magic (oh, hell, magick) wand will give mighty useful information without the proper study program.
BTW, I don't know whether anyone else here has seen this use, but a PA recently used a small IR imager to find the veins in my forearm, for sticking purposes.
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