NEMA code letters use letters of the alphabet to represent
the amount of locked- rotor amperage (LRA) in kVA per horsepower a motor
will draw when it's started. From the table in Fig. 1 notice that letters
in the front of the alphabet indicate low LRA ratings, and letters in
the back of the alphabet indicate higher LRA ratings. It's important
to remember that the number in the table isn't the amount of LRA the
motor will draw, but rather it's the number that must he multiplied by
the horsepower rating of the motor.
Above: Fig. 1: Table with locked-rotor amperage (LRA) ratings. The
ratings are listed as amount of kVa per horse power.