refrigerant motor-compressors], plus the sum of the full-load currents of the other motors of the group.
Where the same rating or setting of the branch- circuit short-circuit and ground-fault protective device is used on two or more of the branch circuits supplied by the feeder, one of the protective devices shall be considered the largest for the above calculations.
Exception No. 1: Where one or more instantaneous trip circuit breakers or motor short-circuit protectors are used for motor branch-circuit short-circuit and ground- fault protection as permitted in 430.52(C), the procedure provided above for determining the maximum rating of the feeder protective device shall apply with the following provision: For the purpose of the calculation, each instantaneous trip circuit breaker or motor short- circuit protector shall be assumed to have a rating not
exceeding the maximum percentage of motor full-load current permitted by Table 430.52 for the type of feeder protective device employed.
Exception No. 2: Where the feeder overcurrent protective device also provides overcurrent protection for a motor control center, the provisions of 430.94 shall apply.
FPN: See Annex D, Example D8.
(B) Other Installations. Where feeder conductors have an ampacity greater than required by 430.24, the rating or setting of the feeder overcurrent protective device shall be permitted to be based on the ampacity of the feeder conductors.
430.63 Rating or Setting — Power and Lighting Loads.
Where a feeder supplies a motor load and, in addition, a lighting or a lighting and appliance load, the feeder protective device shall have a rating sufficient to carry the lighting or lighting and appliance load, plus the following: (1) For a single motor, the rating permitted by 430.52
(2) For a single hermetic refrigerant motor-compressor,
the rating permitted by 440.22
(3) For two or more motors, the rating permitted by
430.62
Exception: Where the feeder overcurrent device provides the overcurrent protection for a motor control center, the provisions of 430.94 shall apply.
VI. Motor Control Circuits
430.71 General. Part VI contains modifications of the general requirements and applies to the particular conditions of motor control circuits.
FPN: See 430.9(B) for equipment device terminal requirements.
430.72 Overcurrent Protection.
(A) General. A motor control circuit tapped from the load side of a motor branch-circuit short-circuit and ground-fault protective device(s) and functioning to control the motor(s) connected to that branch circuit shall be protected against overcurrent in accordance with 430.72. Such a tapped control circuit shall not be considered to be a branch circuit and shall be permitted to be protected by either a supplementary or branch-circuit overcurrent protective device(s). A motor control circuit other than such a tapped control circuit shall be protected against overcurrent in accordance with 725.43 or the notes to Table 11(A) and Table 11(B) in Chapter 9, as applicable.
(B) Conductor Protection. The overcurrent protection
for conductors shall be provided as specified in
430.72(B)(1) or (B)(2).
Exception No. 1: Where the opening of the control circuit would create a hazard as, for example, the control circuit of a fire pump motor, and the like, conductors of control circuits shall require only