112 Power Supply

Much of this information consists of standards defined by the National Electrical Manufacturers Association (NEMA).

The power supply is one of the major factors affecting selection, installation, operation, and maintenance of an electrical motor driven system. Usual service conditions, defined in NEMA Standard Publication MG1, Motors and Generators,2 include:

• Motors designed for rated voltage, frequency, and number of phases.

• The supply voltage must be known to select the proper motor.

• Motor nameplate voltage will normally be less then nominal power system voltage.

Nominal Power System Voltage (Volts)

Motor Utilization (Nameplate) Voltage Volts

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