Square D HOM Breaker & Max Wire Size

[Marc Benz]

Marc S.

I did notice on the breaker that 40°C marking is that correct for the HOM breakers ?? i am used to see 60°C or 60/75°C marking on it

if so i have to watch that one.

Merci, Marc

[jtedesco1]

Originally Posted by Marc Benz

Marc S.

I did notice on the breaker that 40°C marking is that correct for the HOM breakers ?? i am used to see 60°C or 60/75°C marking on it

if so i have to watch that one.

Merci, Marc

See #28:

[Marc D. Shunk]

Originally Posted by Marc Benz

Marc S.

I did notice on the breaker that 40°C marking is that correct for the HOM breakers ?? i am used to see 60°C or 60/75°C marking on it

if so i have to watch that one.

Merci, Marc

That is the ambient temp rating, not the terminal rating. The terminal rating is at the upper right in my picture.

[Greg Fretwell]

I wrote a proposal question whether a panel full of AFCIs in unairconditioned space that might exceed 104f/40c and they just blew it off with a no answer answer.
I was hoping they would refer to something that tells you the consquence of being in an ambient above 40c. That can happen in a Florida garage and wouldn't be unusual at all in Arizona.

[Marc Benz]

Thanks Marc and Joe T. for highlighting this


sorry about confuseing with the rating i just want to double check it that all

Many thanks

Merci, Marc

[Marc D. Shunk]

Originally Posted by Greg Fretwell

I was hoping they would refer to something that tells you the consquence of being in an ambient above 40c. That can happen in a Florida garage and wouldn't be unusual at all in Arizona.

They trip quicker. That's all. They might even trip below their marked ampacity. No hazard, for sure, but possibly a nuisance. It's not really anything that people have field reported as ever being a real problem. It's interesting to talk about, for sure, but in practice it's not causing any troubles.