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  1. #1
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    Default Warm breakers, how much is too much?

    Pair of 60-amp double-pole breakers for an electric force air furnace. Both were warm to touch when the furnace was running. My infra red thermoter showed 92-114 degrees. Side note, the panel is in an old basement, so the ambient temp was in the 60's.

    I have only see a couple of electric furnaces before, so don't know if this is unusual. Didn't see anything else alarming in the wire run or at the furnace.

    How warm would be considered to be too warm?

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  2. #2
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    Default Re: Warm breakers, how much is too much?

    Quote Originally Posted by Terry Beck View Post
    Pair of 60-amp double-pole breakers for an electric force air furnace. Both were warm to touch when the furnace was running. My infra red thermoter showed 92-114 degrees. Side note, the panel is in an old basement, so the ambient temp was in the 60's.

    I have only see a couple of electric furnaces before, so don't know if this is unusual. Didn't see anything else alarming in the wire run or at the furnace.

    How warm would be considered to be too warm?
    HVAC always hotter than ambient when they are running. Just curious, What was the ambient temp when you took the disco temp?

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  3. #3
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    Default Re: Warm breakers, how much is too much?

    Hey man, back in dem days of disco, I was HOT!!!. Me and Travolta. Boy oh boy.
    Sorry. long day.
    Ok - so what is a disco temp? I probably didn't take it.


  4. #4
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    Default Re: Warm breakers, how much is too much?

    Quote Originally Posted by Terry Beck View Post
    Hey man, back in dem days of disco, I was HOT!!!. Me and Travolta. Boy oh boy.
    Sorry. long day.
    Ok - so what is a disco temp? I probably didn't take it.
    What was the ambient temperature when you measured the HVAC breaker.

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  5. #5
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    Default Re: Warm breakers, how much is too much?

    As I said originally
    Side note, the panel is in an old basement, so the ambient temp was in the 60's.
    So we're talking about a rise of 40-50 degrees on the surface of the breaker as compared to surrounding air.


  6. #6
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    Default Re: Warm breakers, how much is too much?

    As it is, I am already calling out a long laundry list of other items that need the attention of an electrician. The property is originally 1916 with old barns, shops, tack rooms, pump houses. Lot's of places for Grampa Ned to screw up the wiring.


  7. #7
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    Default Re: Warm breakers, how much is too much?

    Quote Originally Posted by Terry Beck View Post
    As I said originally

    So we're talking about a rise of 40-50 degrees on the surface of the breaker as compared to surrounding air.
    It was pulling a load, of course it will be hot.

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  8. #8
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    Default Re: Warm breakers, how much is too much?

    No more than 35 degrees above ambient.

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  9. #9
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    Default Re: Warm breakers, how much is too much?

    Ambient temperature rating will depend on breaker manufacture, but the temp should be on the breaker itself.

    Without knowing make of breaker, its a guess at the very least.

    Temperature Derating for Circuit Breakers

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    Last edited by Raymond Wand; 11-03-2012 at 06:37 AM.

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