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).