MOTOR CIRCUITS, CONTROLLERS

70-387 Part A. General, Sections 430-1 through 430-18 Part B. Motor Circuit Conductors, Sections 430-21 through 430-29. Part C. Motor and Branch-Circuit Overload Protection, Sections 430-31 through 430-44. Part D. Motor Branch-Circuit Short-Circuit and Ground-Fault Protection, Sections 430-51 through 430-58 Part E. Motor Feeder Short-Circuit and Ground-Fault Protection, Sections 430-61 through 430-63 Part F. Motor Control Circuits, Sections 430-71 through 430-74. Part G. Motor Controllers, Sections 430-81 through 430-91. Part H. Motor Control Centers, Sections 430-92 Through 430-98. Part 1. Disconnecting Means, Sections 430-101 through 430-113. Part J. Over 600 Volts, Nominal, Sections 430-121 through 430-127. Part K. Protection of Live Parts-All Voltages, Sections 430-131 through 430-133. Part L. Grounding-All Voltages, Sections 430-141 through 430-145. Part M. Tables, Tables 430-147 through 430-152. To supply Part B Motor feeder Sec. 430-24 430-25 and 430-26 Motor feeder short-circuit and ground-fault protection Part E Motor disconnecting means Part 1 Motor branch-circuit short-circuit and ground-fault protection Part D Motor circuit conductor Part B Motor controller Part G Motor control circuits Part F Motor overload Part C protection Motor Part A Thermal protection 0 b Part C Secondary controller Part B Secondary conductors Sec. 430-23 Secondary resistor Part B Sec. 430-23 and Art. 470 (FPN) Diagram 430-1. 70-388 NATIONAL ELECTRICAL CODE The disconnecting means shall be permitted to be in the incoming line to the conversion equipment and shall have a rating not less than 115 percent of the rated input current of the conversion unit. 430-3. Part-Winding Motors. A part-winding-start induction or synchronous motor is one arranged for starting by first energizing part of its primary (armature) winding and, subsequently, energizing the remainder of this winding in one or more steps. The purpose is to reduce the initial values of the starting current drawn or the starting torque developed by the motor. A standard part-winding-start induction motor is arranged so that one-half of its primary winding can be energized initially, and, subsequently, the remaining half can be energized, both halves then carrying equal current. A hermetic refrigerant compressor motor shall not be considered a standard part-winding-start induction motor. Where separate overload devices are used with a standard part-windingstart induction motor, each half of the motor winding shall be individually protected in accordance with Sections 430-32 and 430-37 with a trip current one-half that specified. Each motor-winding connection shall have branch-circuit short-circuit and ground-fault protection rated at not more than one-half that specified by Section 430-52. Exception: A single device having this half rating shall be permitted for both windings if it will allow the motor to start. Where a time-delay (dualelement) fuse is used as a single device for both windings, it shall be permitted to have a rating not exceeding 150 percent of motor full-load current. 430-5. Other Articles. Motors and controllers shall also comply with the applicable provisions of the following: Air-Conditioning and Refrigerating Equipment