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Posted by sylvan butler on March 17, 2006, 3:27 pm
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> A 5 HP single phase motor, on 240 volts, should be fed with a 20 amp double
> pole breaker.
Not hardly.
My marathon 5hp is spec'ed at 27.5amps continuous on 230v. It has a
starting surge captured by my peak-reading clamp on ammeter at around
100amps. There is NO WAY it is going to run from a functional 20amp
breaker. Following NEC rules, since no delayed action breaker was
available for my panel, it is currently very happy on a 50amp breaker.
> That size breaker would afford full load current protection
> for the motor.
I depend on the motor's own overload protection and let the breaker
protect the wiring as that is the way things are designed to work.
> Check with local code to be sure what is "right" for your
> location.
That at least is very good advice.
sdb
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> pole breaker.