NEMA Class 1 Division 2 Group D Motors
NEMA Class 1 Division 2 Group D Motors
(OP)
With LV and MV motors is it allowed to apply a service factor of 1.15 and still keep within the allowed stator / rotor temperature limits class B
If we allowed a service factor, then the motor could be deemed to be overloaded and exceeding the T temperature classificaTION
Would this be a correct assumption
Regards
If we allowed a service factor, then the motor could be deemed to be overloaded and exceeding the T temperature classificaTION
Would this be a correct assumption
Regards





RE: NEMA Class 1 Division 2 Group D Motors
Also, don't confuse the motor's design limits with the surface temperature limitation from NEC. If it comes with a surface temperature label, then it will also have a thermal cutout (sealed, of course) to prevent exceeding that rating. Even if the cutout were to operate, it should still be well within design limits.
William
RE: NEMA Class 1 Division 2 Group D Motors
Motor operations with adecuate overload protection will prevent development of high temperature.
For details consult the National Electric Code NFPA 70.