Tables, Tables 430.247 through 430.251 (B) Part XIV

To Supply

ARTICLE 430

Motors, Motor Circuits, and Controllers

Part II

430.24,

430.25,430.26

I. General

430.1 Scope. This article covers motors, motor branch- circuit and feeder conductors and their protection, motor overload protection, motor control circuits, motor controllers, and motor control centers.

FPN No. 1: Installation requirements for motor control centers are covered in 110.26(F). Air-conditioning and refrigerating equipment are covered in Article 440.
FPN No. 2: Figure 430.1 is for information only.

430.2 Definitions.

Motor feeder

Motor feeder short- circuit and ground- fault protection

Motor disconnecting means

Part IX PartV

Adjustable Speed Drive. A combination of the power converter, motor, and motor-mounted auxiliary devices such as encoders, tachometers, thermal switches and

Part III Motor control circuits Part VI

Motor overload protection

detectors, air blowers, heaters, and vibration sensors.

Part I

Adjustable-Speed Drive System. An interconnected combination of equipment that provides a means of

Thermal protection < m h

Part III

adjusting the speed of a mechanical load coupled to a

Secondary resistor

motor. A drive

General, 430.1 through 430.18 Part I Motor Circuit Conductors, 430.21 through 430.29 Part II Motor and Branch-Circuit Overload Protection, 430.31 Part III

through 430.44

Secondary controller

Secondary conductors

Figure 430.1 Article 430 Contents.

Part II

430.23

Part II 430.23 and

Article 470

Motor Branch-Circuit Short-Circuit and Ground-Fault Part IV Protection, 430.51 through 430.58

Motor Feeder Short-Circuit and Ground-Fault Protection, Part V

430.61 through 430.63

Motor Control Circuits, 430.71 through 430.74 Part VI Motor Controllers, 430.81 through 430.90 Part VII Motor Control Centers, 430.92 through 430.98 Part VIII

Disconnecting Means, 430.101 through 430.113 Part IX Adjustable Speed Drive Systems, 430.120 through 430.128 Part X

Over 600 Volts, Nominal, 430.221 through 430.227 Part XI Protection of Live Parts—All Voltages, 430.231 Part XII

through 430.233

Grounding—All Voltages, 430.241 through 430.245 Part XIII

system typically consists of an adjustable speed drive and auxiliary electrical apparatus.

Controller. For the purpose of this article, a controller is any switch or device that is normally used to start and stop a motor by making and breaking the motor circuit current.

Motor Control Circuit. The circuit of a control apparatus or system that carries the electric signals directing the performance of the controller but does not carry the main power current.

System Isolation Equipment A redundantly monitored, remotely operated contactor-isolating system, packaged to provide the disconnection/isolation function, capable of verifiable operation from multiple remote locations by means of lockout switches, each

having the capability of being padlocked in the "off' (open) position.

Valve Actuator Motor (VAM) Assemblies. A manufac- tured assembly, used to operate a valve, consisting of an actuator motor and other components such as controllers, torque switches, limit switches, and overload protection.

FPN: VAMs typically have short-time duty and high- torque characteristics.

430.4 Part-Winding Motors. A part-winding start induction or synchronous motor is one that is arranged for starting by first energizing part of its primary (armature) winding and, subsequently, energizing the

(1) Table Values. Other than for motors built for low speeds (less than 1200 RPM) or high torques, and for multi-speed motors,