the line side of the controller shall be based on the motor full-load current. The selection of conductors between the controller and the motor shall be based on 58 percent of the motor full-load current.
(D) Part-Winding Motor. For a part-winding connected motor, the selection of branch-circuit conductors on the line side of the controller shall be based on the motor full-load current. The selection of conductors between the controller and the motor shall be based on 50 percent of the motor full-load current.
(E) Other Than Continuous Duty. Conductors for a motor used in a short-time, intermittent, periodic, or varying duty application shall have an ampacity of not less than the percentage of the motor nameplate current rating shown in Table 430.22(E), unless the authority having jurisdiction grants special permission for conductors of lower ampacity.
Table 430.22(E) Duty-Cycle Service
Nameplate Current Rating Percentages
30- & 60- Contin-
5-Minute 15-Minute Minute uous Classification of Rated Rated Rated Rated Service Motor Motor Motor Motor
Short-time duty 110 120 150 —
operating valves, raising or lowering rolls, etc.
Intermittent duty 85 85 90 140 freight and passenger
elevators, tool heads,
pumps, drawbridges,
turntables, etc. (for arc
welders, see
630.11)
Table 430.23(C) Secondary Conductor
Ampacity of Conductor in
Percent of Full-Load
Resistor Duty Classification Secondary Current
Light starting duty 35
Heavy starting duty 45
Extra-heavy starting duty 55
Light intermittent duty 65
Medium intermittent duty 75
Heavy intermittent duty 85
Continuous duty 110
430.24 Several Motors or a Motor(s) and Other Load(s). Conductors supplying several motors, or a mo- tors) and other load(s), shall have an ampacity not less than 125 percent of the full-load current rating of the
Periodic duty rolls, ore- and coal- handling machines, etc.
85 90 95 140
highest rated motor plus the sum of the full-load current ratings of all the other motors in the group, as determined by 430.6(A), plus the ampacity required for the other loads.
Varying duty no 120 150 200
Note: Any motor application shall be considered as continuous duty unless the nature of the apparatus it drives is such that the motor will not operate continuously with load under any condition of use.
(F) Separate Terminal Enclosure. The conductors be- tween a stationary motor rated 1 hp or less and the separate terminal enclosure permitted in 430.245(B) shall be permitted to be smaller than 14 AWG but not smaller than 18 AWG, provided they have an ampacity as specified in 430.22(A).
430.23 Wound-Rotor Secondary.
(A) Continuous Duty. For continuous duty, the conductors connecting the secondary of a wound-rotor ac motor to its controller shall have an ampacity not less than 125 percent of the full-load secondary current of the motor.
(B) Other Than Continuous Duty. For other than con- tinuous duty, these conductors shall have an ampacity, in percent of full-load secondary current, not less than that specified in Table 430.22(E).
(C) Resistor Separate from Controller. Where the sec- ondary resistor is separate from the controller, the ampacity of the conductors between controller and resistor shall not be less than that shown in Table
430.23(C).