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Old 12-20-2011, 09:12 PM   #1
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Breaker temp. ratings


Hi to all, I just did a search back to 2007 and read the threads regarding CB terminal ratings. I am still unsure : In my new 200 amp panel I have many new 15 Amp breakers rated @ 60/75C. ( came with the panel ) I also have a few old 15 Amp breakers, rated at 40C. from my previous panel. All the same brand name, UL / CSA approved. I am using NMD 90 14/2 Roomex. Are these old breaker temp. ratings OK to use in the new panel. I am in Canada. Thanks

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Old 12-20-2011, 09:47 PM   #2
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Breaker temp. ratings


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Originally Posted by Sammy 2 View Post
Hi to all, I just did a search back to 2007 and read the threads regarding CB terminal ratings. I am still unsure : In my new 200 amp panel I have many new 15 Amp breakers rated @ 60/75C. ( came with the panel ) I also have a few old 15 Amp breakers, rated at 40C. from my previous panel. All the same brand name, UL / CSA approved. I am using NMD 90 14/2 Roomex. Are these old breaker temp. ratings OK to use in the new panel. I am in Canada. Thanks
In the last 50 years I am not familiar with any thermal magnetic circuit breaker that had 40C terminal ratings. Many had 60C and almost all now have dual rating 60/75C
.
The 40C (104 F) means the ambient temperature at which the breaker trip curve is designed.


http://www.ul.com/global/documents/o...BreakersMG.pdf

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Old 12-20-2011, 10:31 PM   #3
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Breaker temp. ratings


Thanks for the reply, I put back on my glasses and yes it says 40C, I even checked another older one and it says the same. Must be a Canadian thing, anyway will the inspector care ????
Stubbie; just checked your link and there is mention of this breaker rating on page 12 item # 29 if it is the same thing.

Last edited by Sammy 2; 12-20-2011 at 10:43 PM.
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Old 12-21-2011, 09:27 AM   #4
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Breaker temp. ratings


40C is the working temp of breaker, 40C wire has never existed even in canada
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Old 12-21-2011, 11:47 AM   #5
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Breaker temp. ratings


So would that be the maximum temp this breaker would operate properly verses the new breaker which is designed / rated to operate at a much higher temp. ? And really - greater than 40 C , does it matter ? Sorry for the pesty questions, just trying to understand the ratings.
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