I have these qo single pole breakers pulling 80% amperage @ 120volts. The circuits are on 24/7 . Panel is hot to the touch . Used a ir thermostat and the breakers were 132- 155* f. None of the breakers tripped out. But is this temperture too much for the cb/ circuit. # 10 thhn wire. Ambient temp is about 78* inside building.
155* f on circuit breakers
- Thread starter jimbo123
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- Wisconsin
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- PE (Retired) - Power Systems
Where did you measure these temperatures?
The hottest spot of a breaker is often the operating handle. The coolest spot is the bus connection followed closely the conductor terminal.
At maximum design operating temperature, it is not unusual to have the breaker be "too hot to touch".
The hottest spot of a breaker is often the operating handle. The coolest spot is the bus connection followed closely the conductor terminal.
At maximum design operating temperature, it is not unusual to have the breaker be "too hot to touch".
Electric-Light
Senior Member
Is it a true RMS clamp meter? If you have non-linear load like computers and CFLs, the reading will be wrong on an average sensing meter.
LarryFine
Master Electrician Electric Contractor Richmond VA
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- Henrico County, VA
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- Electrical Contractor
Ideally, that is.
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Design wise, actually. Your experience in real life may be different.
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