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Chapter 4 Equipment for General Use | 430.38 | Motor overload devices, other than fuses or thermal protectors, shall simultaneously open a sufficient number of ungrounded conductors to interrupt current flow to the motor. [430.38](https://2023.antflix.net#430.38) | https://2023.antflix.net#430.38 |
Chapter 4 Equipment for General Use | 430.39 | A motor controller shall also be permitted to serve as an overload device if the number of overload units complies with Table 430.37 and if these units are operative in both the starting and running position in the case of a dc motor, and in the running position in the case of an ac motor. [430.39](https://2023.antflix... | https://2023.antflix.net#430.39 |
Chapter 4 Equipment for General Use | 430.40 | Overload relays and other devices for motor overload protection that are not capable of opening short circuits or ground faults shall be protected by fuses or circuit breakers with ratings or settings in accordance with 430.52 or by a motor short-circuit protector in accordance with 430.52. Exception: Where approved fo... | https://2023.antflix.net#430.40 |
Chapter 4 Equipment for General Use | 430.42 | Overload protection for motors used on general-purpose branch circuits shall be provided as specified in 430.42(A), (B), (C), or (D). [430.42](https://2023.antflix.net#430.42) | https://2023.antflix.net#430.42 |
Chapter 4 Equipment for General Use | 430.42(A) | One or more motors without individual overload protection shall be permitted to be connected to a general-purpose branch circuit only where the installation complies with the limiting conditions specified in 430.32(B), 430.32(D), and 430.53(A)(1) and (A)(2). [430.42(A)](https://2023.antflix.net#430.42(A)) | https://2023.antflix.net#430.42(A) |
Chapter 4 Equipment for General Use | 430.42(B) | Motors of ratings larger than specified in 430.53(A) shall be permitted to be connected to general-purpose branch circuits only where each motor is protected by overload protection selected to protect the motor as specified in 430.32. Both the motor controller and the motor overload device shall be approved for group i... | https://2023.antflix.net#430.42(B) |
Chapter 4 Equipment for General Use | 430.42(C) | Where a motor is connected to a branch circuit by means of an attachment plug and a receptacle or cord connector, and individual overload protection is omitted in accordance with 430.42(A), the rating of the attachment plug and receptacle or cord connector shall not exceed 15 amperes at 125 volts or 250 volts. Where in... | https://2023.antflix.net#430.42(C) |
Chapter 4 Equipment for General Use | 430.42(D) | The branch-circuit short-circuit and ground-fault protective device protecting a circuit to which a motor or motor-operated appliance is connected shall have sufficient time delay to permit the motor to start and accelerate its load. [430.42(D)](https://2023.antflix.net#430.42(D)) | https://2023.antflix.net#430.42(D) |
Chapter 4 Equipment for General Use | 430.43 | A motor overload device that can restart a motor automatically after overload tripping shall not be installed unless approved for use with the motor it protects. A motor overload device that can restart a motor automatically after overload tripping shall not be installed if automatic restarting of the motor can result ... | https://2023.antflix.net#430.43 |
Chapter 4 Equipment for General Use | 430.44 | If immediate automatic shutdown of a motor by a motor overload protective device(s) would introduce additional or increased hazard(s) to a person(s) and continued motor operation is necessary for safe shutdown of equipment or process, a motor overload sensing device(s) complying with Part III of this article shall be p... | https://2023.antflix.net#430.44 |
Chapter 4 Equipment for General Use | 430.51 | Part IV specifies devices intended to protect the motor branch-circuit conductors, the motor control apparatus, and the motors against overcurrent due to short circuits or ground faults. The devices specified in Part IV do not include the types of devices required by 210.8, 230.95, and 590.6.
Informational Note No. 1: ... | https://2023.antflix.net#430.51 |
Chapter 4 Equipment for General Use | 430.52(A) | The motor branch-circuit short-circuit and ground-fault protective device shall comply with 430.52(B) and either 430.52(C) or (D), as applicable. [430.52(A)](https://2023.antflix.net#430.52(A)) | https://2023.antflix.net#430.52(A) |
Chapter 4 Equipment for General Use | 430.52(B) | The motor branch-circuit short-circuit and ground-fault protective device shall be capable of carrying the starting current of the motor. [430.52(B)](https://2023.antflix.net#430.52(B)) | https://2023.antflix.net#430.52(B) |
Chapter 4 Equipment for General Use | 430.52(C)(1) | A protective device that has a rating or setting not exceeding the value calculated according to the values given in Table 430.52(C)(1) shall be used unless otherwise permitted in 430.52(C)(1)(a) or (C)(1)(b). Where the values as determined by Table 430.52(C)(1) do not correspond to the standard ampere ratings and sett... | https://2023.antflix.net#430.52(C)(1) |
Chapter 4 Equipment for General Use | 430.52(C)(2) | Where maximum branch-circuit short-circuit and ground-fault protective device ratings are shown in the manufacturer's overload relay table for use with a motor controller or are otherwise marked on the equipment, they shall not be exceeded even if higher values are allowed as shown above. [430.52(C)(2)](https://2023.an... | https://2023.antflix.net#430.52(C)(2) |
Chapter 4 Equipment for General Use | 430.52(C)(3) | An instantaneous-trip circuit breaker shall be permitted if the conditions of 430.52(C)(3) (a) and (C)(3) (b) are met. Application. Instantaneous-trip circuit breakers shall be adjustable and part of a listed combination motor controller having coordinated motor overload and short-circuit and ground-fault protection in... | https://2023.antflix.net#430.52(C)(3) |
Chapter 4 Equipment for General Use | 430.52(C)(4) | For a multispeed motor, a single short-circuit and ground-fault protective device shall be permitted for two or more windings of the motor if the rating of the protective device does not exceed the above applicable percentage of the nameplate rating of the smallest winding protected.Exception: For a multispeed motor, a... | https://2023.antflix.net#430.52(C)(4) |
Chapter 4 Equipment for General Use | 430.52(C)(5) | Semiconductor fuses intended for the protection of electronic devices shall be permitted in lieu of devices listed in Table 430.52(C)(1) for power electronic devices, associated electromechanical devices (such as bypass contactors and isolation contactors), and conductors in a solid-state motor controller system if the... | https://2023.antflix.net#430.52(C)(5) |
Chapter 4 Equipment for General Use | 430.52(C)(6) | A listed self-protected combination motor controller shall be permitted in lieu of the devices specified in Table 430.52(C)(1). Adjustable instantaneous-trip settings shall not exceed 1300 percent of the full-load motor current for other than Design B energy-efficient and Design B premium efficiency motors and not more... | https://2023.antflix.net#430.52(C)(6) |
Chapter 4 Equipment for General Use | 430.52(C)(7) | A motor short-circuit protector shall be permitted in lieu of devices listed in Table 430.52(C)(1) if the motor short-circuit protector is part of a listed combination motor controller having coordinated motor overload protection and short-circuit and ground-fault protection in each conductor and it will open the circu... | https://2023.antflix.net#430.52(C)(7) |
Chapter 4 Equipment for General Use | 430.52(D) | Torque motor branch circuits shall be protected at the motor nameplate current rating in accordance with 240.4(B). [430.52(D)](https://2023.antflix.net#430.52(D)) | https://2023.antflix.net#430.52(D) |
Chapter 4 Equipment for General Use | 430.53 | Two or more motors or one or more motors and other loads shall be permitted to be connected to the same branch circuit under conditions specified in 430.53(D) and in 430.53(A), (B), or (C). The branch-circuit protective device shall be fuses or inverse time circuit breakers. [430.53](https://2023.antflix.net#430.53) | https://2023.antflix.net#430.53 |
Chapter 4 Equipment for General Use | 430.53(A) | Several motors, each not exceeding 1 hp in rating, shall be permitted on a nominal 120-volt branch circuit protected at not over 20 amperes or a branch circuit of 1000 volts, nominal, or less, protected at not over 15 amperes, if all of the following conditions are met: The full-load rating of each motor does not excee... | https://2023.antflix.net#430.53(A) |
Chapter 4 Equipment for General Use | 430.53(B) | Two or more motors or one or more motors and other loads shall be permitted to be connected to a branch circuit where all of the following conditions are met: The branch-circuit short-circuit and ground-fault protective device is selected not to exceed that allowed by 430.52 for the smallest rated motor supplied by the... | https://2023.antflix.net#430.53(B) |
Chapter 4 Equipment for General Use | 430.53(C) | Two or more motors of any size or one or more motors and other loads, with each motor having individual overload protection, shall be permitted to be connected to a branch circuit where the motor controller(s) and overload device(s) comply with 430.53(C)(1) through (C)(5). [430.53(C)](https://2023.antflix.net#430.53(C)... | https://2023.antflix.net#430.53(C) |
Chapter 4 Equipment for General Use | 430.53(C)(1) | The assembly type shall meet one of the following conditions: A listed factory assembly, with the motor branch-circuit short-circuit and ground-fault protective device either provided as part of the assembly or specified by a marking on the assemblyField installation of the motor branch-circuit short-circuit and ground... | https://2023.antflix.net#430.53(C)(1) |
Chapter 4 Equipment for General Use | 430.53(C)(2) | Each motor overload device shall meet one of the following conditions: Listed for group installation with a specified maximum rating of fuse, inverse time circuit breaker, or bothSelected such that the ampere rating of the motor-branch short-circuit and ground-fault protective device does not exceed that permitted by 4... | https://2023.antflix.net#430.53(C)(2) |
Chapter 4 Equipment for General Use | 430.53(C)(3) | Each motor controller shall meet one of the following conditions: Listed for group installation with a specified maximum rating of fuse, circuit breaker, or bothSelected such that the ampere rating of the motor-branch short-circuit and ground-fault protective device does not exceed that permitted by 430.52 for that ind... | https://2023.antflix.net#430.53(C)(3) |
Chapter 4 Equipment for General Use | 430.53(C)(4) | The branch circuit shall be protected by fuses or listed inverse time circuit breakers having a rating not exceeding the sum of all of the following: The value specified in 430.52 for the highest rated motor connected to the branch circuitThe sum of the full-load current ratings of all other motorsThe sum of the curren... | https://2023.antflix.net#430.53(C)(4) |
Chapter 4 Equipment for General Use | 430.53(C)(5) | Loads other than motor loads shall be protected in accordance with Part I through Part VII of Article 240. Informational Note: See 110.10 for circuit impedance and other characteristics. [430.53(C)(5)](https://2023.antflix.net#430.53(C)(5)) | https://2023.antflix.net#430.53(C)(5) |
Chapter 4 Equipment for General Use | 430.53(D) | For group installations described in 430.53(A), (B), or (C), the conductors of any tap supplying a single motor shall not be required to have an individual branch-circuit short-circuit and ground-fault protective device if they comply with 430.53(D)(1) or (D)(2). [430.53(D)](https://2023.antflix.net#430.53(D)) | https://2023.antflix.net#430.53(D) |
Chapter 4 Equipment for General Use | 430.53(D)(1) | Conductors to the motor shall have an ampacity that is not less than the ampacity of the branch-circuit conductors unless all of the following conditions are met: The conductors from the point of the tap to the motor overload device shall not be longer than 7.5 m (25 ft).The conductor ampacity is not less than one-thir... | https://2023.antflix.net#430.53(D)(1) |
Chapter 4 Equipment for General Use | 430.53(D)(2) | Conductors from the point of the tap from the branch circuit to a listed manual motor controller additionally marked "Suitable for Tap Conductor Protection in Group Installations," or to a branch-circuit protective device, shall meet one of the following conditions: The length of the motor tap conductors does not excee... | https://2023.antflix.net#430.53(D)(2) |
Chapter 4 Equipment for General Use | 430.54 | The rating of the branch-circuit short-circuit and ground-fault protective device for multimotor and combination-load equipment shall not exceed the rating marked on the equipment in accordance with 430.7(D). [430.54](https://2023.antflix.net#430.54) | https://2023.antflix.net#430.54 |
Chapter 4 Equipment for General Use | 430.55 | Motor branch-circuit short-circuit and ground-fault protection and motor overload protection shall be permitted to be combined in a single protective device where the rating or setting of the device provides the overload protection specified in 430.32. [430.55](https://2023.antflix.net#430.55) | https://2023.antflix.net#430.55 |
Chapter 4 Equipment for General Use | 430.56 | Branch-circuit protective devices shall comply with 240.15. [430.56](https://2023.antflix.net#430.56) | https://2023.antflix.net#430.56 |
Chapter 4 Equipment for General Use | 430.57 | Where fuses are used for motor branch-circuit short-circuit and ground-fault protection, the fuseholders shall not be of a smaller size than required to accommodate the fuses specified by Table 430.52(C)(1). Exception: Where fuses having time delay appropriate for the starting characteristics of the motor are used, it ... | https://2023.antflix.net#430.57 |
Chapter 4 Equipment for General Use | 430.58 | A circuit breaker for motor branch-circuit short-circuit and ground-fault protection shall have a current rating in accordance with 430.52 and 430.110. [430.58](https://2023.antflix.net#430.58) | https://2023.antflix.net#430.58 |
Chapter 4 Equipment for General Use | 430.61 | Part V specifies protective devices intended to protect feeder conductors supplying motors against overcurrents due to short circuits or ground-faults. Informational Note: See Informative Annex D, Example D8, for an example of motor feeder circuit short-circuit and ground-fault protection rating and setting. [430.61](h... | https://2023.antflix.net#430.61 |
Chapter 4 Equipment for General Use | 430.62(A) | A feeder supplying a specific fixed motor load(s) and consisting of conductor sizes in accordance with 430.24 shall be provided with a protective device having a rating or setting not greater than the largest rating or setting of the branch-circuit short-circuit and ground-fault protective device for any motor supplied... | https://2023.antflix.net#430.62(A) |
Chapter 4 Equipment for General Use | 430.62(B) | 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. [430.62(B)](https://2023.antflix.net#430.62(B)) | https://2023.antflix.net#430.62(B) |
Chapter 4 Equipment for General Use | 430.63 | Where a feeder supplies a motor load and other load(s), the feeder protective device shall have a rating not less than that required for the sum of the other load(s) plus the following: For a single motor, the rating permitted by 430.52For a single hermetic refrigerant motor-compressor, the rating permitted by 440.22Fo... | https://2023.antflix.net#430.63 |
Chapter 4 Equipment for General Use | 430.71 | Part VI contains modifications of the general requirements and applies to the particular conditions of motor control circuits. [430.71](https://2023.antflix.net#430.71) | https://2023.antflix.net#430.71 |
Chapter 4 Equipment for General Use | 430.72(A) | 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... | https://2023.antflix.net#430.72(A) |
Chapter 4 Equipment for General Use | 430.72(B) | 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 short-circuit and... | https://2023.antflix.net#430.72(B) |
Chapter 4 Equipment for General Use | 430.72(B)(1) | Where the motor branch-circuit short-circuit and ground-fault protective device does not provide protection in accordance with 430.72(B)(2), separate overcurrent protection shall be provided. The over-current protection shall not exceed the values specified in Column A of Table 430.72(B)(2). [430.72(B)(1)](https://2023... | https://2023.antflix.net#430.72(B)(1) |
Chapter 4 Equipment for General Use | 430.72(B)(2) | Conductors shall be permitted to be protected by the motor branch-circuit short-circuit and ground-fault protective device and shall require only short-circuit and ground-fault protection. Where the conductors do not extend beyond the motor control equipment enclosure, the rating of the protective device(s) shall not e... | https://2023.antflix.net#430.72(B)(2) |
Chapter 4 Equipment for General Use | 430.72(C) | Where a motor control circuit transformer is provided, the transformer shall be protected in accordance with 430.72(C)(1), (C)(2), (C)(3), (C)(4), or (C)(5). Exception: Overcurrent protection shall be omitted where the opening of the control circuit would create a hazard as, for example, the control circuit of a fire p... | https://2023.antflix.net#430.72(C) |
Chapter 4 Equipment for General Use | 430.72(C)(1) | Where the transformer supplies a Class 1 power-limited circuit, the circuit shall comply with 724.30 through 724.52. Where the transformer supplies a Class 2 or Class 3 remote-control circuit, the circuit shall comply with the requirements of Part II of Article 725. [430.72(C)(1)](https://2023.antflix.net#430.72(C)(1)) | https://2023.antflix.net#430.72(C)(1) |
Chapter 4 Equipment for General Use | 430.72(C)(2) | Protection shall be permitted to be provided in accordance with 450.3. [430.72(C)(2)](https://2023.antflix.net#430.72(C)(2)) | https://2023.antflix.net#430.72(C)(2) |
Chapter 4 Equipment for General Use | 430.72(C)(3) | Control circuit transformers rated less than 50 volt-amperes (VA) and that are an integral part of the motor controller and located within the motor controller enclosure shall be permitted to be protected by primary overcurrent devices, impedance limiting means, or other inherent protective means. [430.72(C)(3)](https:... | https://2023.antflix.net#430.72(C)(3) |
Chapter 4 Equipment for General Use | 430.72(C)(4) | Where the control circuit transformer rated primary current is less than 2 amperes, an overcurrent device rated or set at not more than 500 percent of the rated primary current shall be permitted in the primary circuit. [430.72(C)(4)](https://2023.antflix.net#430.72(C)(4)) | https://2023.antflix.net#430.72(C)(4) |
Chapter 4 Equipment for General Use | 430.72(C)(5) | Protection shall be permitted to be provided by other approved means. [430.72(C)(5)](https://2023.antflix.net#430.72(C)(5)) | https://2023.antflix.net#430.72(C)(5) |
Chapter 4 Equipment for General Use | 430.73 | Where damage to a motor control circuit would constitute a hazard, all conductors of such a remote motor control circuit that are outside the control device itself shall be installed in a raceway or be otherwise protected from physical damage. [430.73](https://2023.antflix.net#430.73) | https://2023.antflix.net#430.73 |
Chapter 4 Equipment for General Use | 430.74 | Where one conductor of the motor control circuit is grounded, the motor control circuit shall be arranged so that a ground fault in the control circuit remote from the motor controller will (1) not start the motor and (2) not bypass manually operated shutdown devices or automatic safety shutdown devices. [430.74](https... | https://2023.antflix.net#430.74 |
Chapter 4 Equipment for General Use | 430.75(A) | Motor control circuits shall be arranged so that they will be disconnected from all sources of supply when the disconnecting means is in the open position. The disconnecting means shall be permitted to consist of two or more separate devices, one of which disconnects the motor and the motor controller from the source(s... | https://2023.antflix.net#430.75(A) |
Chapter 4 Equipment for General Use | 430.75(B) | Where a transformer or other device is used to obtain a reduced voltage for the motor control circuit and is located in the motor controller enclosure, such transformer or other device shall be connected to the load side of the disconnecting means for the motor control circuit. [430.75(B)](https://2023.antflix.net#430.... | https://2023.antflix.net#430.75(B) |
Chapter 4 Equipment for General Use | 430.81 | Part VII is intended to require suitable motor controllers for all motors. [430.81](https://2023.antflix.net#430.81) | https://2023.antflix.net#430.81 |
Chapter 4 Equipment for General Use | 430.81(A) | For a stationary motor rated at 1/8 hp or less that is normally left running and is constructed so that it cannot be damaged by overload or failure to start, such as clock motors and the like, the branch-circuit disconnecting means shall be permitted to serve as the motor controller. [430.81(A)](https://2023.antflix.ne... | https://2023.antflix.net#430.81(A) |
Chapter 4 Equipment for General Use | 430.81(B) | For a portable motor rated at 1/3 hp or less, the motor controller shall be permitted to be an attachment plug and receptacle or cord connector. [430.81(B)](https://2023.antflix.net#430.81(B)) | https://2023.antflix.net#430.81(B) |
Chapter 4 Equipment for General Use | 430.82(A) | Each motor controller shall be capable of starting and stopping the motor it controls and shall be capable of interrupting the locked-rotor current of the motor. [430.82(A)](https://2023.antflix.net#430.82(A)) | https://2023.antflix.net#430.82(A) |
Chapter 4 Equipment for General Use | 430.82(B) | An autotransformer starter shall provide an "off" position, a running position, and at least one starting position. It shall be designed so that it cannot rest in the starting position or in any position that will render the overload device in the circuit inoperative. [430.82(B)](https://2023.antflix.net#430.82(B)) | https://2023.antflix.net#430.82(B) |
Chapter 4 Equipment for General Use | 430.82(C) | Rheostats shall be in compliance with the following: Motor-starting rheostats shall be designed so that the contact arm cannot be left on intermediate segments. The point or plate on which the arm rests when in the starting position shall have no electrical connection with the resistor.Motor-starting rheostats for dc m... | https://2023.antflix.net#430.82(C) |
Chapter 4 Equipment for General Use | 430.83 | The motor controller shall have a rating in accordance with 430.83(A), unless otherwise permitted in 430.83(B) or (C), or in accordance with (D), under the conditions specified. [430.83](https://2023.antflix.net#430.83) | https://2023.antflix.net#430.83 |
Chapter 4 Equipment for General Use | 430.83(A)(1) | Motor controllers, other than inverse time circuit breakers and molded case switches, shall have horsepower ratings at the application voltage not lower than the horsepower rating of the motor. [430.83(A)(1)](https://2023.antflix.net#430.83(A)(1)) | https://2023.antflix.net#430.83(A)(1) |
Chapter 4 Equipment for General Use | 430.83(A)(2) | A branch-circuit inverse time circuit breaker rated in amperes shall be permitted as a motor controller for all motors. Where this circuit breaker is also used for overload protection, it shall conform to the appropriate provisions of this article governing overload protection. [430.83(A)(2)](https://2023.antflix.net#4... | https://2023.antflix.net#430.83(A)(2) |
Chapter 4 Equipment for General Use | 430.83(A)(3) | A molded case switch rated in amperes shall be permitted as a motor controller for all motors. [430.83(A)(3)](https://2023.antflix.net#430.83(A)(3)) | https://2023.antflix.net#430.83(A)(3) |
Chapter 4 Equipment for General Use | 430.83(B) | Devices in accordance with 430.81(A) and (B) shall be permitted as a motor controller. [430.83(B)](https://2023.antflix.net#430.83(B)) | https://2023.antflix.net#430.83(B) |
Chapter 4 Equipment for General Use | 430.83(C) | For stationary motors rated at 2 hp or less and 300 volts or less, the motor controller shall be permitted to be either of the following: A general-use switch having an ampere rating not less than twice the full-load current rating of the motorOn ac circuits, a general-use snap switch suitable only for use on ac (not g... | https://2023.antflix.net#430.83(C) |
Chapter 4 Equipment for General Use | 430.83(D) | For torque motors, the motor controller shall have a continuous-duty, full-load current rating not less than the nameplate current rating of the motor. For a motor controller rated in horsepower but not marked with the foregoing current rating, the equivalent current rating shall be determined from the horsepower ratin... | https://2023.antflix.net#430.83(D) |
Chapter 4 Equipment for General Use | 430.83(E) | A motor controller with a straight voltage rating, for example, 240 volts or 480 volts, shall be permitted to be applied in a circuit in which the nominal voltage between any two conductors does not exceed the motor controller's voltage rating. A motor controller with a slash rating, for example, 120/240 volts or 480Y/... | https://2023.antflix.net#430.83(E) |
Chapter 4 Equipment for General Use | 430.83(F) | A motor controller shall not be installed where the available fault current exceeds the motor controller's short-circuit current rating. Informational Note: The short-circuit current rating might be marked on the device or might be a rating for a tested combination specified in the motor controller's technical manual o... | https://2023.antflix.net#430.83(F) |
Chapter 4 Equipment for General Use | 430.84 | The motor controller shall not be required to open all conductors to the motor. Exception: Where the motor controller serves also as a disconnecting means, it shall open all ungrounded conductors to the motor in accordance with 430.111. [430.84](https://2023.antflix.net#430.84) | https://2023.antflix.net#430.84 |
Chapter 4 Equipment for General Use | 430.85 | One pole of the motor controller shall be permitted to be placed in a permanently grounded conductor if the motor controller is designed so that the pole in the grounded conductor cannot be opened without simultaneously opening all conductors of the circuit. [430.85](https://2023.antflix.net#430.85) | https://2023.antflix.net#430.85 |
Chapter 4 Equipment for General Use | 430.87 | Each motor shall be provided with an individual motor controller. Exception No. 1: For motors rated 1000 volts or less, a single motor controller rated at not less than the equivalent horsepower, as determined in accordance with 430.110(C)(1), of all the motors in the group shall be permitted to serve the group under a... | https://2023.antflix.net#430.87 |
Chapter 4 Equipment for General Use | 430.88 | Adjustable-speed motors that are controlled by means of field regulation shall be equipped and connected so that they cannot be started under a weakened field. Exception: Starting under a weakened field shall be permitted where the motor is designed for such starting. [430.88](https://2023.antflix.net#430.88) | https://2023.antflix.net#430.88 |
Chapter 4 Equipment for General Use | 430.89 | Machines of the following types shall be provided with speed-limiting devices or other speed-limiting means: Separately excited dc motorsSeries motorsMotor-generators and converters that can be driven at excessive speed from the dc end, as by a reversal of current or decrease in loadException: Separate speed-limiting d... | https://2023.antflix.net#430.89 |
Chapter 4 Equipment for General Use | 430.90 | The rating of a combination fuseholder and switch used as a motor controller shall be such that the fuseholder will accommodate the size of the fuse specified in Part III of this article for motor overload protection. Exception: Where fuses having time delay appropriate for the starting characteristics of the motor are... | https://2023.antflix.net#430.90 |
Chapter 4 Equipment for General Use | 430.92 | Part VIII covers motor control centers installed for the control of motors, lighting, and power circuits. [430.92](https://2023.antflix.net#430.92) | https://2023.antflix.net#430.92 |
Chapter 4 Equipment for General Use | 430.94 | Motor control centers shall be provided with overcurrent protection in accordance with Parts I, II, and VIII of Article 240. The ampere rating or setting of the overcurrent protective device shall not exceed the rating of the common power bus. This protection shall be provided by (1) an overcurrent protective device lo... | https://2023.antflix.net#430.94 |
Chapter 4 Equipment for General Use | 430.95 | Where used as service equipment, each motor control center shall be provided with a single main disconnecting means to disconnect all ungrounded service conductors. Exception No. 1: A second service disconnect shall be permitted to supply additional equipment. Where a grounded conductor is provided, the motor control c... | https://2023.antflix.net#430.95 |
Chapter 4 Equipment for General Use | 430.96 | Multisection motor control centers shall be connected together with an equipment grounding conductor or an equivalent equipment grounding bus sized in accordance with Table 250.122. Equipment grounding conductors shall be connected to this equipment grounding bus or to a grounding termination point provided in a single... | https://2023.antflix.net#430.96 |
Chapter 4 Equipment for General Use | 430.97(A) | Busbars shall be protected from physical damage and be held firmly in place. Other than for required interconnections and control wiring, only those conductors that are intended for termination in a vertical section shall be located in that section. Exception: Conductors shall be permitted to travel horizontally throug... | https://2023.antflix.net#430.97(A) |
Chapter 4 Equipment for General Use | 430.97(B) | The phase arrangement on 3-phase horizontal common power and vertical buses shall be A, B, C from front to back, top to bottom, or left to right, as viewed from the front of the motor control center. The B phase shall be that phase having the higher voltage to ground on 3-phase, 4-wire, delta-connected systems. Other b... | https://2023.antflix.net#430.97(B) |
Chapter 4 Equipment for General Use | 430.97(C) | The minimum wire-bending space at the motor control center terminals and minimum gutter space shall be in accordance with 312.6. [430.97(C)](https://2023.antflix.net#430.97(C)) | https://2023.antflix.net#430.97(C) |
Chapter 4 Equipment for General Use | 430.97(D) | Spacings between motor control center bus terminals and other bare metal parts shall not be less than specified in Table 430.97(D).
Table 430.97(D) Minimum Spacing Between Bare Metal Parts
Nominal Voltage
Opposite Polarity Where Mounted on the Same Surface
Opposite Polarity Where Held Free in Air
Live Parts to Groun... | https://2023.antflix.net#430.97(D) |
Chapter 4 Equipment for General Use | 430.97(E) | Barriers shall be placed in all service-entrance motor control centers to isolate service busbars and terminals from the remainder of the motor control center. [430.97(E)](https://2023.antflix.net#430.97(E)) | https://2023.antflix.net#430.97(E) |
Chapter 4 Equipment for General Use | 430.98(A) | Motor control centers shall be marked according to 110.21, and the marking shall be plainly visible after installation. Marking shall also include common power bus current rating and motor control center short-circuit current rating. [430.98(A)](https://2023.antflix.net#430.98(A)) | https://2023.antflix.net#430.98(A) |
Chapter 4 Equipment for General Use | 430.98(B) | Motor control units in a motor control center shall comply with 430.8. [430.98(B)](https://2023.antflix.net#430.98(B)) | https://2023.antflix.net#430.98(B) |
Chapter 4 Equipment for General Use | 430.99 | The available fault current at the motor control center and the date the available fault current calculation was performed shall be documented and made available to those authorized to inspect, install, or maintain the installation. [430.99](https://2023.antflix.net#430.99) | https://2023.antflix.net#430.99 |
Chapter 4 Equipment for General Use | 430.101 | Part IX is intended to require disconnecting means capable of disconnecting motors and motor controllers from the circuit. [430.101](https://2023.antflix.net#430.101) | https://2023.antflix.net#430.101 |
Chapter 4 Equipment for General Use | 430.102(A) | An individual disconnecting means shall be provided for each motor controller and shall disconnect the motor controller. The disconnecting means shall be located in sight from the motor controller location. Exception No. 1: For motor circuits over 1000 volts, nominal, a motor controller disconnecting means lockable in ... | https://2023.antflix.net#430.102(A) |
Chapter 4 Equipment for General Use | 430.102(B) | A disconnecting means shall be provided for a motor in accordance with 430.102(B)(1) or (B)(2). [430.102(B)](https://2023.antflix.net#430.102(B)) | https://2023.antflix.net#430.102(B) |
Chapter 4 Equipment for General Use | 430.102(B)(1) | A disconnecting means for the motor shall be located in sight from the motor location and the driven machinery location. [430.102(B)(1)](https://2023.antflix.net#430.102(B)(1)) | https://2023.antflix.net#430.102(B)(1) |
Chapter 4 Equipment for General Use | 430.102(B)(2) | The motor controller disconnecting means required in accordance with 430.102(A) shall be permitted to serve as the disconnecting means for the motor if it is in sight from the motor location and the driven machinery location. Exception to (1) and (2): The disconnecting means for the motor shall not be required under ei... | https://2023.antflix.net#430.102(B)(2) |
Chapter 4 Equipment for General Use | 430.103 | The disconnecting means shall open all ungrounded supply conductors and shall be designed so that no pole can be operated independently. The disconnecting means shall be permitted in the same enclosure with the motor controller. The disconnecting means shall be designed so that it cannot be closed automatically. Inform... | https://2023.antflix.net#430.103 |
Chapter 4 Equipment for General Use | 430.104 | The disconnecting means shall plainly indicate whether it is in the open (off) or closed (on) position. [430.104](https://2023.antflix.net#430.104) | https://2023.antflix.net#430.104 |
Chapter 4 Equipment for General Use | 430.105 | One pole of the disconnecting means shall be permitted to disconnect a permanently grounded conductor, provided the disconnecting means is designed so that the pole in the grounded conductor cannot be opened without simultaneously disconnecting all conductors of the circuit. [430.105](https://2023.antflix.net#430.105) | https://2023.antflix.net#430.105 |
Chapter 4 Equipment for General Use | 430.107 | At least one of the disconnecting means shall be readily accessible. [430.107](https://2023.antflix.net#430.107) | https://2023.antflix.net#430.107 |
Chapter 4 Equipment for General Use | 430.108 | Every disconnecting means in the motor circuit between the point of attachment to the feeder or branch circuit and the point of connection to the motor shall comply with the requirements of 430.109 and 430.110. [430.108](https://2023.antflix.net#430.108) | https://2023.antflix.net#430.108 |
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