N

NAMEPLATE

The plate on the outside of the motor describing the motor horsepower, voltage, speed efficiency, design, enclosure, etc.

NAVY SERVICE “A”

Motors designed to meet requirements of MIL M-17059 or MIL M-17060 for high shock and service and are essential to the combat effectiveness of a ship.  These motors are usually made of nodular iron.

N.E.C. TEMPERATURE CODE (“T” CODE)

A National Electrical Code index for describing maximum allowable “skin” (surface) temperature of a motor under any normal or abnormal operating conditions.  The “T” codes are applicable to U.L. listed explosion-proof motors.  The skin temperature shall not exceed the minimum ignition temperature of the substances to be found in the hazardous location.  The “T” code designations apply to motors and other types of electrical equipment subject to hazardous location classification.

NEMA

The National Electrical Manufacturers Association is a non-profit organization organized and supported by manufacturers of electric equipment and supplies.  NEMA has set standards for:

·        Horsepower ratings

·        Speeds

·        Frame sizes and dimensions

·        Standard voltages and frequencies with allowable variations

·        Service factors

·        Torque

·        Starting current & KVA

·        Enclosures

NODULAR IRON (DUCTILE IRON)

Special cast iron with a crystalline formation, which makes it capable of handling high shock.