dnbob
Senior Member
- Location
- Rochester, MN
I had measured the temperature of the circuit breakers in a 480/277 volt panelboard with an IR tester. A few 277 volt circuit breakers in the panel tested 15-20 degrees (F) above ambient. They were drawing between 9 and 10 amps on 20 amp breakers.
I looked at previous posts, and it seems this is in an acceptable range.
Wondering if this is an item of concern?
I tried to find information on UL 489, which I believe replaced NEMA AB-1, wasn't helpful.
Thanks!
I looked at previous posts, and it seems this is in an acceptable range.
Wondering if this is an item of concern?
I tried to find information on UL 489, which I believe replaced NEMA AB-1, wasn't helpful.
Thanks!