NEC permits breakers controlling motor loads to be sized up to
250% of the locked rotor amperes. Motor could sit their all day
long and cook, and the breaker wouldn't trip.
Motor overload protection is a separate deal, and can be
accomplished with a 'heater' as its called or even a lower rated
time-delay fuse. Cooper/Bussman actually sells a handybox plate
with disconnect switch and fuse holder for this very thing.
On 2/1/2021 3:10 PM, Alan Muller wrote:
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But, I would think that if the motor is stalled it would draw
"locked rotor amps" and this ought to trip a properly selected
overload or fuse pretty much immediately.? Not so?
