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430.29 Constant Voltage Direct-Current Motors — Power Resistors
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Conductors connecting the motor controller to separately mounted power accelerating and dynamic braking resistors in the armature circuit shall have an ampacity not less than the value calculated from Table 430.29 using motor full-load current. If an armature shunt resistor is used, the power accelerating resistor conductor ampacity shall be calculated using the total of motor full-load current and armature shunt resistor current.
Armature shunt resistor conductors shall have an ampacity of not less than that calculated from Table 430.29 using rated shunt resistor current as full-load current.
Table 430.29 Conductor Rating Factors for Power Resistors
|Time in Seconds||Ampacity of Conductor in Percent of Full-Load Current|
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