430.7(B).
(9) Design letter for design B, C, or D motors.
FPN: Motor design letter definitions are found in ANSI/NEMA MG 1-1993, Motors and Generators, Part I, Definitions, and in IEEE 100-1996, Standard Dictionary of Electrical and Electronic Terms.
(10) Secondary volts and full-load current if a wound- rotor induction motor.
(11) Field current and voltage for dc excited synchronous motors.
(12) Winding — straight shunt, stabilized shunt, com- pound, or series, if a dc motor. Fractional horsepower dc motors 175 mm (7 in.) or less in diameter shall not be required to be marked.
(13) A motor provided with a thermal protector complying with 430.32(A)(2) or (B)(2) shall be marked 'Thermally Protected." Thermally protected motors rated 100 watts or less and complying with 430.32(B)(2) shall be permitted to use the abbreviated marking "T.P."
(14) A motor complying with 430.32(B)(4) shall be marked "Impedance Protected." Impedance- protected motors rated 100 watts or less and complying with 430.32(B)(4) shall be permitted to use the abbreviated marking "Z.P."
(15) Motors equipped with electrically powered condensation prevention heaters shall be marked with the rated heater voltage, number of phases, and the rated power in watts.
(B) Locked-Rotor Indicating Code Letters. Code letters marked on motor nameplates to show motor input with locked rotor shall be in accordance with Table 430.7(B).
The code letter indicating motor input with locked rotor shall be in an individual block on the nameplate, properly designated.
(1) Multispeed Motors. Multispeed motors shall be marked with the code letter designating the locked- rotor
kilovolt-ampere (kVA) per horsepower for the highest speed at which the motor can be started.
Exception: Constant horsepower multispeed motors shall be marked with the code letter giving the highest locked-rotor kilovolt-ampere (kVA) per horsepower.
(2) Single-Speed Motors. Single-speed motors starting
on wye connection and running on delta connections
Table 430.7(B) Locked-Rotor Indicating Code Letters
Kilovolt-Amperes per Horsepower
Code Letter with Locked Rotor
A 0-3.14
B 3.15-3.54
C 3.55-3.99
D 4.0-4.49
E 4.5-4.99
F 5.0-5.59
G 5.6-6.29
H 6.3-7.09
J 7.1-7.99
K 8.0-8.99
L 9.0-9.99
M 10.0-11.19
N 11.2-12.49
P 12.5-13.99
R 14.0-15.99
S 16.0-17.99
T 18.0-19.99
U 20.0-22.39
V 22.4 and up
shall be marked with a code letter corresponding to the locked-rotor kilovolt-ampere (kVA) per horsepower for the wye connection.
(3) Dual-Voltage Motors. Dual-voltage motors that have a different locked-rotor kilovolt-ampere (kVA) per horsepower on the two voltages shall be marked with the code letter for the voltage giving the highest locked-rotor kilovolt-ampere (kVA) per horsepower.
(4) 50/60 Hz Motors. Motors with 50- and 60-Hz ratings shall be marked with a code letter designating the locked-rotor kilovolt-ampere (kVA) per
horsepower on 60 Hz.
(5) Part Winding Motors. Part-winding start motors shall be marked with a code letter designating the locked-rotor kilovolt-ampere (kVA) per horsepower that is based on the locked-rotor current for the full winding of the motor.
(C) Torque Motors. Torque motors are rated for operation at standstill and shall be marked in accordance with 430.7(A), except that locked-rotor torque shall replace horsepower.
(D) Multimotor and Combination-Load Equipment. (1) Factory-Wired. Multimotor and combination-load equipment shall be