AC Motor Name Plate - Terms & Meanings

When you see the name plate of an electric motor, you will find many terms which defines the performance characteristics of the motor. These include supply voltage, rated full load current, motor horse power, motor speed in RPM, frequency of power supply, motor frame, motor duty, AC motor insulation class, motor design, service factor, motor efficiency, power factor, number of poles, winding type connection-star or delta and many more. Shown below is a typical
NEMA motor name plate design.

''NAME OF MANUFACTURER''
ORDER NO	IZ4560089590
TYPE	HIGH EFFICIENCY	FRAME	286T
H.P.	30	SERVICE FACTOR	1.15			3 PH
AMPS	25	VOLTS	415			Y
R.P.M.	1800	HERTZ	50			4 POLE
DUTY	CONT.	DATE	02/26/2015
CLASS INSUL	F	NEMA DESIGN	B	NEMA NOM. EFF.	90
"ADDRESS OF MANUFACTURER" "Safety Standard Symbol here"

The terms on the above AC motor name plate and their various meanings as applied in industry are described in the table below:

Name Plate Terms	Meaning
Volts	Rated terminal supply voltage.
Amps	Rated full-load supply current. Some motor name plate have FLA - Full load Current
H.P.	Rated motor output in Horse power
R.P.M	Rated full-load speed of the motor.
Hertz	Rated supply frequency.
Frame	External physical dimension of the motor based on the NEMA standards
Duty	Motor load condition, whether it is continuos load, short time, periodic, etc.
Date	Date of manufacturing.
Class Insulation	Insulation class used for the motor construction. This specifies max. limit of the motor winding temperature.
NEMA Design	This specifies to which NEMA design class the motor belongs to.
Service Factor	Factor by which the motor can be overloaded beyond the full load.
NEMA Nom. Efficiency	Motor operating efficiency at full load.
PH	Specifies number of stator phases of the motor.
Pole	Specifies number of poles of the motor.
Y	Specifies whether the motor windings are Star (Y) connected or Delta (?) connected.
Safety Standard Symbol	Specifies the motor safety standard.