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Nema Design A - D

Nema Design A - D

Nema Design A - D

(OP)
Are these torque values as defined in NEMA relate to all motors. What I'm thinking is their a Kw size limit, and also is it just relate to Low Voltage Motors. And would not be appropriate to MV/HV motors irrespective of power.

RE: Nema Design A - D

They related to small and integral horsepower motors.  The cutoff is somewhere in the neighborhood 250 - 500 rpm, depending on speed.

NEMA does not apply these curves to larger motors.

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RE: Nema Design A - D

As electricpete mencioned these designs per NEMA MG1 standard apply only to small and medium machines and the scope is given in par 12.0

The induction motors up to and including:
     500 HP - 3600 rpm
     500 HP - 1800 rpm
     350 HP - 1200 rpm
     250 HP - 900  rpm
     200 HP - 720  rpm
     150 HP - 600  rpm
     125 HP - 514  rpm

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