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Chapter 4 Equipment for General Use | 430.109 | The disconnecting means shall be a type in accordance with 430.109(A), unless otherwise permitted in 430.109(B) through (G), under the conditions specified. [430.109](https://2023.antflix.net#430.109) | https://2023.antflix.net#430.109 |
Chapter 4 Equipment for General Use | 430.109(A)(1) | A listed motor-circuit switch rated in horsepower. [430.109(A)(1)](https://2023.antflix.net#430.109(A)(1)) | https://2023.antflix.net#430.109(A)(1) |
Chapter 4 Equipment for General Use | 430.109(A)(2) | A listed molded case circuit breaker. [430.109(A)(2)](https://2023.antflix.net#430.109(A)(2)) | https://2023.antflix.net#430.109(A)(2) |
Chapter 4 Equipment for General Use | 430.109(A)(3) | A listed molded case switch. [430.109(A)(3)](https://2023.antflix.net#430.109(A)(3)) | https://2023.antflix.net#430.109(A)(3) |
Chapter 4 Equipment for General Use | 430.109(A)(4) | An instantaneous-trip circuit breaker that is part of a listed combination motor controller. [430.109(A)(4)](https://2023.antflix.net#430.109(A)(4)) | https://2023.antflix.net#430.109(A)(4) |
Chapter 4 Equipment for General Use | 430.109(A)(5) | Listed self-protected combination motor controller. [430.109(A)(5)](https://2023.antflix.net#430.109(A)(5)) | https://2023.antflix.net#430.109(A)(5) |
Chapter 4 Equipment for General Use | 430.109(A)(6) | Listed manual motor controllers additionally marked "Suitable as Motor Disconnect" shall be permitted as a disconnecting means where installed between the final motor branch-circuit short-circuit protective device and the motor. Listed manual motor controllers additionally marked "Suitable as Motor Disconnect" shall be permitted as disconnecting means on the line side of the fuses in accordance with 430.52(C)(5). In this case, the fuses permitted in 430.52(C)(5) shall be considered supplementary fuses, and suitable branch-circuit short-circuit and ground-fault protective devices shall be installed on the line side of the manual motor controller additionally marked "Suitable as Motor Disconnect." [430.109(A)(6)](https://2023.antflix.net#430.109(A)(6)) | https://2023.antflix.net#430.109(A)(6) |
Chapter 4 Equipment for General Use | 430.109(A)(7) | System isolation equipment shall be listed for disconnection purposes. System isolation equipment shall be installed on the load side of the overcurrent protection and its disconnecting means. The disconnecting means shall be one of the types permitted by 430.109(A)(1) through (A)(3). [430.109(A)(7)](https://2023.antflix.net#430.109(A)(7)) | https://2023.antflix.net#430.109(A)(7) |
Chapter 4 Equipment for General Use | 430.109(B) | For stationary motors of 1/8 hp or less, the branch-circuit overcurrent device shall be permitted to serve as the disconnecting means. [430.109(B)](https://2023.antflix.net#430.109(B)) | https://2023.antflix.net#430.109(B) |
Chapter 4 Equipment for General Use | 430.109(C) | For stationary motors rated at 2 hp or less and 300 volts or less, the disconnecting means shall be permitted to be one of the following devices: 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 general-use ac—dc snap switches) where the motor full-load current rating is not more than 80 percent of the ampere rating of the switchA listed manual motor controller having a horsepower rating not less than the rating of the motor and marked "Suitable as Motor Disconnect" [430.109(C)](https://2023.antflix.net#430.109(C)) | https://2023.antflix.net#430.109(C) |
Chapter 4 Equipment for General Use | 430.109(D) | For motors of over 2 hp up to and including 100 hp, the separate disconnecting means required for a motor with an autotransformer-type motor controller shall be permitted to be a general-use switch where all of the following provisions are met: The motor drives a generator that is provided with overload protection.The motor controller is capable of interrupting the locked-rotor current of the motors, is provided with a no voltage release, and is provided with running overload protection not exceeding 125 percent of the motor full-load current rating.Separate fuses or an inverse time circuit breaker rated or set at not more than 150 percent of the motor full-load current is provided in the motor branch circuit. [430.109(D)](https://2023.antflix.net#430.109(D)) | https://2023.antflix.net#430.109(D) |
Chapter 4 Equipment for General Use | 430.109(E) | For stationary motors rated at more than 40 hp dc or 100 hp ac, the disconnecting means shall be permitted to be a general-use or isolating switch where plainly marked "Do not operate under load." [430.109(E)](https://2023.antflix.net#430.109(E)) | https://2023.antflix.net#430.109(E) |
Chapter 4 Equipment for General Use | 430.109(F) | For a cord-and-plug-connected motor, a horsepower-rated attachment plug and receptacle, flanged surface inlet and cord connector, or attachment plug and cord connector having ratings not less than the motor ratings shall be permitted to serve as the disconnecting means. Horsepower-rated attachment plugs, flanged surface inlets, receptacles, or cord connectors shall not be required for cord-and-plug-connected appliances in accordance with 422.33, room air conditioners in accordance with 440.63, or portable motors rated 1/3 hp or less. [430.109(F)](https://2023.antflix.net#430.109(F)) | https://2023.antflix.net#430.109(F) |
Chapter 4 Equipment for General Use | 430.109(G) | For torque motors, the disconnecting means shall be permitted to be a general-use switch. [430.109(G)](https://2023.antflix.net#430.109(G)) | https://2023.antflix.net#430.109(G) |
Chapter 4 Equipment for General Use | 430.110(A) | The disconnecting means for motor circuits rated 1000 volts, nominal, or less shall have a current rating not less than 115 percent of the full-load current rating of the motor. Exception: A listed unfused motor-circuit switch having a horsepower rating not less than the motor horsepower shall be permitted to have a current rating less than 115 percent of the full-load current rating of the motor. [430.110(A)](https://2023.antflix.net#430.110(A)) | https://2023.antflix.net#430.110(A) |
Chapter 4 Equipment for General Use | 430.110(B) | Disconnecting means for a torque motor shall have a current rating of at least 115 percent of the motor nameplate current. [430.110(B)](https://2023.antflix.net#430.110(B)) | https://2023.antflix.net#430.110(B) |
Chapter 4 Equipment for General Use | 430.110(C) | Where two or more motors are used together or where one or more motors are used in combination with other loads, such as resistance heaters, and where the combined load can be simultaneous on a single disconnecting means, the current and horsepower ratings of the combined load shall be determined in accordance with 430.110(C)(1) through (C)(3). [430.110(C)](https://2023.antflix.net#430.110(C)) | https://2023.antflix.net#430.110(C) |
Chapter 4 Equipment for General Use | 430.110(C)(1) | The rating of the disconnecting means shall be determined from the sum of all currents, including resistance loads, at the full-load condition and also at the locked-rotor condition. The combined full-load current and the combined locked-rotor current so obtained shall be considered as a single motor for the purpose of this requirement. The full-load current equivalent to the horsepower rating of each motor shall be selected from Table 430.247, Table 430.248, Table 430.249, or Table 430.250. These full-load currents shall be added to the rating in amperes of other loads to obtain an equivalent full-load current for the combined load. The locked-rotor current equivalent to the horsepower rating of each motor shall be selected from Table 430.251(A) or Table 430.251(B). The locked-rotor currents shall be added to the rating in amperes of other loads to obtain an equivalent locked-rotor current for the combined load. Where two or more motors or other loads cannot be started simultaneously, the largest sum of locked-rotor currents of a motor or group of motors that can be started simultaneously and the full-load currents of other concurrent loads shall be permitted to be used to determine the equivalent locked-rotor current for the simultaneous combined loads. In cases where different current ratings are obtained when applying these tables, the largest value obtained shall be used. Exception No. 1: The locked-rotor current equivalent to the horsepower rating of each polyphase motor with design letter A shall be one of following: (1) If available, the motor's marked value of locked-rotor amperes (2) In the absence of a marked value of locked-rotor amperes for the motor, the value calculated from Equation 430.110(C)(1)a: [430.110(C)(1)a] where: kVA/hp = maximum range value of kilovolt-amperes per horsepower with locked rotor in Table 430.7(B) associated with the motor's marked locked-rotor indicating code letter Informational Note: Equation 430.110(C)(1)a is obtained by solving for locked-rotor amperes in the formula for "kilovolt-amperes per horsepower with locked rotor," as follows: [430.110(C)(1)b] The numerator of Equation 430.110(C)(1)b for kilovolt-amperes per horsepower is the apparent power input to a three-phase motor with locked rotor in units of volt-amperes. The factor of 1000 VA/kVA in the denominator converts this value to units of kilovolt-amperes and "(marked value of rated horsepower)" in the denominator converts this to kilovolt-amperes per horsepower. Note that "motor's marked value of rated volts" is a line-to-line value and "locked-rotor amperes" is a line value as opposed to a phase value. Exception No. 2: Where part of the concurrent load is resistance load, and where the disconnecting means is a switch rated in horsepower and current, the switch used shall be permitted to have a horsepower rating not less than the combined load of the motor(s) if the current rating of the switch is not less than the locked-rotor current of the motor(s) plus the resistance load. [430.110(C)(1)](https://2023.antflix.net#430.110(C)(1)) | https://2023.antflix.net#430.110(C)(1) |
Chapter 4 Equipment for General Use | 430.110(C)(2) | The current rating of the disconnecting means shall not be less than 115 percent of the sum of all currents at the full-load condition determined in accordance with 430.110(C)(1). Exception: A listed nonfused motor-circuit switch having a horsepower rating equal to or greater than the equivalent horsepower of the combined loads, determined in accordance with 430.110(C)(1), shall be permitted to have a current rating less than 115 percent of the sum of all currents at the full-load condition. [430.110(C)(2)](https://2023.antflix.net#430.110(C)(2)) | https://2023.antflix.net#430.110(C)(2) |
Chapter 4 Equipment for General Use | 430.110(C)(3) | For small motors not covered by Table 430.247, Table 430.248, Table 430.249, or Table 430.250, the locked-rotor current shall be assumed to be six times the full-load current. [430.110(C)(3)](https://2023.antflix.net#430.110(C)(3)) | https://2023.antflix.net#430.110(C)(3) |
Chapter 4 Equipment for General Use | 430.111 | A switch or circuit breaker shall be permitted to be used as both the motor controller and disconnecting means if it complies with 430.111(A) and is one of the types specified in 430.111 (B). [430.111](https://2023.antflix.net#430.111) | https://2023.antflix.net#430.111 |
Chapter 4 Equipment for General Use | 430.111(A) | The switch or circuit breaker complies with the requirements for motor controllers specified in 430.83, opens all ungrounded conductors to the motor, and is protected by an overcurrent device in each ungrounded conductor (which shall be permitted to be the branch-circuit fuses). The overcurrent device protecting the motor controller shall be permitted to be part of the motor controller assembly or shall be permitted to be separate. An autotransformer-type motor controller shall be provided with a separate disconnecting means. [430.111(A)](https://2023.antflix.net#430.111(A)) | https://2023.antflix.net#430.111(A) |
Chapter 4 Equipment for General Use | 430.111(B) | The device shall be one of the types specified in 430.111(B)(1), (B)(2), or (B)(3). [430.111(B)](https://2023.antflix.net#430.111(B)) | https://2023.antflix.net#430.111(B) |
Chapter 4 Equipment for General Use | 430.111(B)(1) | An air-break switch, operable directly by applying the hand to a lever or handle. [430.111(B)(1)](https://2023.antflix.net#430.111(B)(1)) | https://2023.antflix.net#430.111(B)(1) |
Chapter 4 Equipment for General Use | 430.111(B)(2) | An inverse time circuit breaker operable directly by applying the hand to a lever or handle. The circuit breaker shall be permitted to be both power-operable and manually operable. [430.111(B)(2)](https://2023.antflix.net#430.111(B)(2)) | https://2023.antflix.net#430.111(B)(2) |
Chapter 4 Equipment for General Use | 430.111(B)(3) | An oil switch used on a circuit whose rating does not exceed 1000 volts or 100 amperes, or by special permission on a circuit exceeding this capacity where under expert supervision. The oil switch shall be permitted to be both power-operable and manually operable. [430.111(B)(3)](https://2023.antflix.net#430.111(B)(3)) | https://2023.antflix.net#430.111(B)(3) |
Chapter 4 Equipment for General Use | 430.112 | Each motor shall be provided with an individual disconnecting means. Exception: A single disconnecting means shall be permitted to serve a group of motors under any one of the conditions of (1), (2), and (3). The single disconnecting means shall be rated in accordance with 430.110(C). (1) Where a number of motors drive several parts of a single machine or piece of apparatus, such as metal- and woodworking machines, cranes, and hoists. (2) Where a group of motors is under the protection of one set of branch-circuit protective devices as permitted by 430.53(A). (3) Where a group of motors is in a single room within sight from the location of the disconnecting means. [430.112](https://2023.antflix.net#430.112) | https://2023.antflix.net#430.112 |
Chapter 4 Equipment for General Use | 430.113 | Motor and motor-operated equipment receiving electric energy from more than one source shall be provided with disconnecting means from each source of electric energy immediately adjacent to the equipment served. Each source shall be permitted to have a separate disconnecting means. Where multiple disconnecting means are provided, a permanent warning sign shall be provided on or adjacent to each disconnecting means indicating that multiple sources must be shut off to remove all power to the equipment. The sign at each disconnect shall identify the other specific circuits. Exception No. 1: Where a motor receives electric energy from more than one source, the disconnecting means for the main power supply to the motor shall not be required to be immediately adjacent to the motor if the motor controller disconnecting means is lockable in accordance with 110.25. Exception No. 2: A separate disconnecting means shall not be required for a Class 2 remote-control circuit complying with Parts I and II of Article 725, rated not more than 30 volts, and isolated and ungrounded. [430.113](https://2023.antflix.net#430.113) | https://2023.antflix.net#430.113 |
Chapter 4 Equipment for General Use | 430.120 | The installation requirements for Part I through Part IX are applicable unless modified or supplemented by Part X. Power conversion equipment used in adjustable-speed drive systems shall comply with Part X for an input or output rated 1000 volts or lower and with Part XI for an input or output rated over 1000 volts. [430.120](https://2023.antflix.net#430.120) | https://2023.antflix.net#430.120 |
Chapter 4 Equipment for General Use | 430.122(A) | Circuit conductors supplying power conversion equipment included as part of an adjustable-speed drive system shall have an ampacity not less than 125 percent of the rated input current to the power conversion equipment. Informational Note: Power conversion equipment can have multiple power ratings and corresponding input currents. [430.122(A)](https://2023.antflix.net#430.122(A)) | https://2023.antflix.net#430.122(A) |
Chapter 4 Equipment for General Use | 430.122(B) | The conductors between the power conversion equipment and the motor shall have an ampacity equal to or larger than 125 percent of the motor full-load current as determined by 430.6(A) or (B). Exception: If the power conversion equipment is listed and marked as "Suitable for Output Motor Conductor Protection," the conductor between the power conversion equipment and the motor shall have an ampacity equal to or greater than the larger of the following: (1) 125 percent of the motor full-load current as determined by 430.6(A) or (B) (2) The ampacity of the minimum conductor size marked on the power conversion equipment Informational Note No. 1: See 430.130 and 430.131 for branch circuit protection requirements. The minimum ampacity required of output conductors is often different than that of the conductors supplying the power conversion equipment. Informational Note No. 2: Circuit conductors on the output of an adjustable-speed drive system are susceptible to breakdown under certain conditions due to the characteristics of the output waveform of the drive. Factors affecting the conductors include, but are not limited to, the output voltage, frequency, and current; the length of the conductors; the spacing between the conductors; and the dielectric strength of the conductor insulation. Methods to mitigate breakdown include consideration of one or more of these factors. [430.122(B)](https://2023.antflix.net#430.122(B)) | https://2023.antflix.net#430.122(B) |
Chapter 4 Equipment for General Use | 430.122(C) | The ampacity of circuit conductors supplying power conversion equipment included as part of an adjustable-speed drive system that utilizes a bypass device shall be the larger of either of the following: 125 percent of the rated input current to the power conversion equipment125 percent of the motor full-load current rating determined in accordance with 430.6 [430.122(C)](https://2023.antflix.net#430.122(C)) | https://2023.antflix.net#430.122(C) |
Chapter 4 Equipment for General Use | 430.122(D) | Conductors supplying several motors or a motor and other loads, including power conversion equipment, shall have ampacity in accordance with 430.24, using the rated input current of the power conversion equipment for purposes of calculating ampacity. [430.122(D)](https://2023.antflix.net#430.122(D)) | https://2023.antflix.net#430.122(D) |
Chapter 4 Equipment for General Use | 430.124 | Overload protection of the motor shall be provided. [430.124](https://2023.antflix.net#430.124) | https://2023.antflix.net#430.124 |
Chapter 4 Equipment for General Use | 430.124(A) | Where the power conversion equipment is marked to indicate that motor overload protection is included, additional overload protection shall not be required. [430.124(A)](https://2023.antflix.net#430.124(A)) | https://2023.antflix.net#430.124(A) |
Chapter 4 Equipment for General Use | 430.124(B) | For adjustable-speed drive systems that utilize a bypass device to allow motor operation at rated full-load speed, motor overload protection as described in Article 430, Part III, shall be provided in the bypass circuit. [430.124(B)](https://2023.antflix.net#430.124(B)) | https://2023.antflix.net#430.124(B) |
Chapter 4 Equipment for General Use | 430.124(C) | For multiple motor application, individual motor overload protection shall be provided in accordance with Article 430, Part III. [430.124(C)](https://2023.antflix.net#430.124(C)) | https://2023.antflix.net#430.124(C) |
Chapter 4 Equipment for General Use | 430.126(A) | Adjustable-speed drive systems shall protect against motor overtemperature conditions where the motor is not rated to operate at the nameplate rated current over the speed range required by the application. This protection shall be provided in addition to the conductor protection required in 430.32. Protection shall be provided by one of the following means: Motor thermal protector in accordance with 430.32Adjustable-speed drive system with load and speed-sensitive overload protection and thermal memory retention upon shutdown or power lossException to (2): Thermal memory retention upon shutdown or power loss is not required for continuous duty loads.Overtemperature protection relay utilizing thermal sensors embedded in the motor and meeting the requirements of 430.126(A)(2)Thermal sensor embedded in the motor whose communications are received and acted upon by an adjustable-speed drive systemInformational Note: The relationship between motor current and motor temperature changes when the motor is operated by an adjustable-speed drive. In certain applications, overheating of motors can occur when operated at reduced speed, even at current levels less than a motor's rated full-load current. The overheating can be the result of reduced motor cooling when its shaft-mounted fan is operating less than rated nameplate RPM. As part of the analysis to determine whether overheating will occur, it is necessary to consider the continuous torque capability curves for the motor given the application requirements. This will assist in determining whether the motor overload protection will be able, on its own, to provide protection against overheating. These overheating protection requirements are only intended to apply to applications where an adjustable-speed drive, as defined in Article 100, is used.For motors that utilize external forced air or liquid cooling systems, overtemperature can occur if the cooling system is not operating. Although this issue is not unique to adjustable speed applications, externally cooled motors are most often encountered with such applications. In these instances, overtemperature protection using direct temperature sensing is recommended [i.e., 430.126(A)(1), (A)(3), or (A)(4)], or additional means should be provided to ensure that the cooling system is operating (flow or pressure sensing, interlocking of adjustable-speed drive system and cooling system, etc.). [430.126(A)](https://2023.antflix.net#430.126(A)) | https://2023.antflix.net#430.126(A) |
Chapter 4 Equipment for General Use | 430.126(B) | For multiple motor applications, individual motor overtemperature protection shall be provided as required in 430.126(A). [430.126(B)](https://2023.antflix.net#430.126(B)) | https://2023.antflix.net#430.126(B) |
Chapter 4 Equipment for General Use | 430.126(C) | 430.43 and 430.44 shall apply to the motor overtemperature protection means. [430.126(C)](https://2023.antflix.net#430.126(C)) | https://2023.antflix.net#430.126(C) |
Chapter 4 Equipment for General Use | 430.128 | 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. [430.128](https://2023.antflix.net#430.128) | https://2023.antflix.net#430.128 |
Chapter 4 Equipment for General Use | 430.130(A) | Circuits containing power conversion equipment shall be protected by a branch-circuit short-circuit and ground-fault protective device in accordance with all of the following: The rating and type of protection shall be determined by 430.52(C)(1), (C)(3), (C)(5), or (C)(6), using the full-load current rating of the motor load as determined by 430.6(A) or (B).Exception to (1): The rating and type of protection shall be permitted to be determined by Table 430.52(C)(1) using the power conversion equipment's rated input current where the power conversion equipment is listed and marked "Suitable for Output Motor Conductor Protection."Informational Note No. 1: Motor conductor branch-circuit short-circuit and ground-fault protection from the power conversion equipment to the motor is provided by power conversion equipment that is listed and marked "Suitable for Output Motor Conductor Protection."Informational Note No. 2: A motor branch circuit using power conversion equipment, including equipment listed and marked "Suitable for Output Motor Conductor Protection," includes the input circuit to the power conversion equipment.Where maximum branch-circuit short-circuit and ground-fault protective ratings are stipulated for specific device types in the manufacturer's instructions for the power conversion equipment or are otherwise marked on the equipment, they shall not be exceeded even if higher values are permitted by 430.130(A)(1).A self-protected combination motor controller shall only be permitted where specifically identified in the manufacturer's instructions for the power conversion equipment or if otherwise marked on the equipment.Informational Note No. 3: The type of protective device, its rating, and its setting are often marked on or provided with the power conversion equipment.Where an instantaneous-trip circuit breaker or semiconductor fuses are permitted in accordance with the drive manufacturer's instructions for use as the branch-circuit short-circuit and ground-fault protective device for listed power conversion equipment, they shall be provided as an integral part of a single listed assembly incorporating both the protective device and power conversion equipment. [430.130(A)](https://2023.antflix.net#430.130(A)) | https://2023.antflix.net#430.130(A) |
Chapter 4 Equipment for General Use | 430.130(B) | Branch-circuit short-circuit and ground-fault protection shall also be provided for a bypass circuit/device(s). Where a single branch-circuit short-circuit and ground-fault protective device is provided for circuits containing both power conversion equipment and a bypass circuit, the branch-circuit protective device type and its rating or setting shall be in accordance with those determined for the power conversion equipment and for the bypass circuit/device(s) equipment. [430.130(B)](https://2023.antflix.net#430.130(B)) | https://2023.antflix.net#430.130(B) |
Chapter 4 Equipment for General Use | 430.131 | For installations meeting all the requirements of 430.53 that include one or more power converters, the branch-circuit short-circuit and ground-fault protective fuses or inverse time circuit breakers shall be of a type and rating or setting permitted for use with the power conversion equipment using the full-load current rating of the connected motor load in accordance with 430.53. For the purposes of 430.53 and 430.131, power conversion equipment shall be considered to be a motor controller. [430.131](https://2023.antflix.net#430.131) | https://2023.antflix.net#430.131 |
Chapter 4 Equipment for General Use | 430.201 | Part XI recognizes the additional hazard due to the use of higher voltages. It adds to or amends the other provisions of this article. [430.201](https://2023.antflix.net#430.201) | https://2023.antflix.net#430.201 |
Chapter 4 Equipment for General Use | 430.202 | In addition to the marking required by 430.8, a motor controller shall be marked with the control voltage. [430.202](https://2023.antflix.net#430.202) | https://2023.antflix.net#430.202 |
Chapter 4 Equipment for General Use | 430.203 | Flexible metal conduit or liquidtight flexible metal conduit not exceeding 1.8 m (6 ft) in length shall be permitted to be employed for raceway connection to a motor terminal enclosure. [430.203](https://2023.antflix.net#430.203) | https://2023.antflix.net#430.203 |
Chapter 4 Equipment for General Use | 430.204 | Motor controllers rated over 1000 volts shall provide wire-bending space within the enclosure for conductors installed in accordance with 305.5. [430.204](https://2023.antflix.net#430.204) | https://2023.antflix.net#430.204 |
Chapter 4 Equipment for General Use | 430.205 | The ampacities of conductors supplying equipment rated over 1000 volts, nominal, shall be determined in accordance with 315.60 or 430.205(A) and (B). [430.205](https://2023.antflix.net#430.205) | https://2023.antflix.net#430.205 |
Chapter 4 Equipment for General Use | 430.205(A) | Conductors supplying motors shall be sized not less than the current trip setting of the motor overload protective device(s). [430.205(A)](https://2023.antflix.net#430.205(A)) | https://2023.antflix.net#430.205(A) |
Chapter 4 Equipment for General Use | 430.205(B) | For an adjustable-speed drive system, the conductors supplying the power conversion equipment shall have an ampacity not less than 125 percent of the rated input current to the power conversion equipment. [430.205(B)](https://2023.antflix.net#430.205(B)) | https://2023.antflix.net#430.205(B) |
Chapter 4 Equipment for General Use | 430.206(A) | Each motor circuit shall include coordinated protection to automatically interrupt overload and fault currents in the motor, the motor-circuit conductors, and the motor control apparatus. Adjustable-speed drive systems with input or output voltages over 1000 volts, nominal, shall comply with 430.124 and 430.126. All other motors shall comply with 430.206(B) through (C). Exception: Where a motor is critical to an operation and the motor should operate to failure if necessary to prevent a greater hazard to persons, the sensing device(s) shall be permitted to be connected to a supervised annunciator or alarm instead of interrupting the motor circuit. [430.206(A)](https://2023.antflix.net#430.206(A)) | https://2023.antflix.net#430.206(A) |
Chapter 4 Equipment for General Use | 430.206(B)(1) | Each motor shall be protected against dangerous heating due to motor overloads and failure to start by a thermal protector integral with the motor or external current-sensing devices, or both. Protective device settings for each motor circuit shall be determined under engineering supervision. [430.206(B)(1)](https://2023.antflix.net#430.206(B)(1)) | https://2023.antflix.net#430.206(B)(1) |
Chapter 4 Equipment for General Use | 430.206(B)(2) | The secondary circuits of wound-rotor ac motors, including conductors, motor controllers, and resistors rated for the application, shall be considered as protected against overcurrent by the motor overload protection means. [430.206(B)(2)](https://2023.antflix.net#430.206(B)(2)) | https://2023.antflix.net#430.206(B)(2) |
Chapter 4 Equipment for General Use | 430.206(B)(3) | Operation of the overload interrupting device shall simultaneously disconnect all ungrounded conductors. [430.206(B)(3)](https://2023.antflix.net#430.206(B)(3)) | https://2023.antflix.net#430.206(B)(3) |
Chapter 4 Equipment for General Use | 430.206(B)(4) | Overload sensing devices shall not automatically reset after trip unless resetting of the overload sensing device does not cause automatic restarting of the motor or there is no hazard to persons created by automatic restarting of the motor and its connected machinery. [430.206(B)(4)](https://2023.antflix.net#430.206(B)(4)) | https://2023.antflix.net#430.206(B)(4) |
Chapter 4 Equipment for General Use | 430.206(C)(1) | Fault-current protection shall be provided in each motor circuit as specified by either 430.206(C)(1) (a) or (C)(1)(b). A circuit breaker of suitable type and rating arranged so that it can be serviced without hazard. The circuit breaker shall simultaneously disconnect all ungrounded conductors. The circuit breaker shall be permitted to sense the fault current by means of integral or external sensing elements.Fuses of a suitable type and rating placed in each ungrounded conductor. Fuses shall be used with suitable disconnecting means, or they shall be of a type that can also serve as the disconnecting means. They shall be arranged so that they cannot be serviced while they are energized. [430.206(C)(1)](https://2023.antflix.net#430.206(C)(1)) | https://2023.antflix.net#430.206(C)(1) |
Chapter 4 Equipment for General Use | 430.206(C)(2) | Fault-current interrupting devices shall not automatically reclose the circuit. Exception: Automatic reclosing of a circuit shall be permitted where the circuit is exposed to transient faults and where such automatic reclosing does not create a hazard to persons. [430.206(C)(2)](https://2023.antflix.net#430.206(C)(2)) | https://2023.antflix.net#430.206(C)(2) |
Chapter 4 Equipment for General Use | 430.206(C)(3) | Overload protection and fault-current protection shall be permitted to be provided by the same device. [430.206(C)(3)](https://2023.antflix.net#430.206(C)(3)) | https://2023.antflix.net#430.206(C)(3) |
Chapter 4 Equipment for General Use | 430.207 | The ultimate trip current of overcurrent (overload) relays or other motor-protective devices used shall not exceed 115 percent of the motor controller's continuous current rating. Where the motor branch-circuit disconnecting means is separate from the motor controller, the disconnecting means current rating shall not be less than the ultimate trip setting of the overcurrent relays in the circuit. [430.207](https://2023.antflix.net#430.207) | https://2023.antflix.net#430.207 |
Chapter 4 Equipment for General Use | 430.208 | The motor controller disconnecting means shall be a switch or circuit breaker having a voltage rating not less than that of the circuit involved, and shall be lockable in accordance with 110.25. The disconnecting means shall have a current rating of not less than 100 percent of the full-load current rating of the motor. For adjustable-speed drive systems, the disconnecting means shall have a current rating not less than 100 percent of the rated input current of the power conversion equipment. [430.208](https://2023.antflix.net#430.208) | https://2023.antflix.net#430.208 |
Chapter 4 Equipment for General Use | 430.231 | Part XII specifies that live parts shall be protected in an approved manner for the hazard involved. [430.231](https://2023.antflix.net#430.231) | https://2023.antflix.net#430.231 |
Chapter 4 Equipment for General Use | 430.232 | Exposed live parts of motors and motor controllers operating at 50 volts or more between terminals shall be guarded against accidental contact by enclosure or by location as follows: By installation in a room or enclosure that is accessible only to qualified personsBy installation on a suitable balcony, gallery, or platform, elevated and arranged so as to exclude unqualified personsBy elevation 2.5 m (8 ft) or more above the floorException: Live parts of motors operating at more than 50 volts between terminals shall not require additional guarding for stationary motors that have commutators, collectors, and brush rigging located inside of motor-end brackets and not conductively connected to supply circuits operating at more than 150 volts to ground. [430.232](https://2023.antflix.net#430.232) | https://2023.antflix.net#430.232 |
Chapter 4 Equipment for General Use | 430.233 | Where live parts of motors or motor controllers operating at over 50 volts to ground are guarded against accidental contact only by location as specified in 430.232, and where adjustment or other attendance could be necessary during the operation of the apparatus, suitable insulating mats or platforms shall be provided so that the attendant cannot readily touch live parts unless standing on the mats or platforms. Informational Note: See 110.26 and 110.34 for information on working space. [430.233](https://2023.antflix.net#430.233) | https://2023.antflix.net#430.233 |
Chapter 4 Equipment for General Use | 430.241 | Part XIII specifies the grounding of exposed non-current-carrying metal parts, likely to become energized, of motor and motor controller frames to limit voltage to ground in the event of accidental contact between energized parts and frames. Insulation, isolation, or guarding are suitable alternatives to grounding of motors under certain conditions. [430.241](https://2023.antflix.net#430.241) | https://2023.antflix.net#430.241 |
Chapter 4 Equipment for General Use | 430.242 | The frames of stationary motors shall be grounded under any of the following conditions: Where supplied by metal-enclosed wiringWhere in a wet location and not isolated or guardedIf in a hazardous (classified) locationIf the motor operates with any terminal at over 150 volts to groundWhere the frame of the motor is not grounded, it shall be permanently and effectively insulated from the ground. [430.242](https://2023.antflix.net#430.242) | https://2023.antflix.net#430.242 |
Chapter 4 Equipment for General Use | 430.243 | The frames of portable motors that operate over 150 volts to ground shall be guarded or grounded. Informational Note No. 1: See 250.114(4) for grounding of portable appliances in other than residential occupancies. Informational Note No. 2: See 250.119(D) for color of equipment grounding conductor in flexible cords. Exception No. 1: Listed motor-operated tools, listed motor-operated appliances, and listed motor-operated equipment shall not be required to be grounded where protected by a system of double insulation or its equivalent. Double-insulated equipment shall be distinctively marked. Exception No. 2: Listed motor-operated tools, listed motor-operated appliances, and listed motor-operated equipment connected by a cord and attachment plug other than those required to be grounded in accordance with 250.114. [430.243](https://2023.antflix.net#430.243) | https://2023.antflix.net#430.243 |
Chapter 4 Equipment for General Use | 430.244 | Motor controller enclosures shall be connected to the equipment grounding conductor regardless of voltage. Motor controller enclosures shall have means for attachment of an equipment grounding conductor termination in accordance with 250.8. Exception: Enclosures attached to ungrounded portable equipment shall not be required to be grounded. [430.244](https://2023.antflix.net#430.244) | https://2023.antflix.net#430.244 |
Chapter 4 Equipment for General Use | 430.245 | Connection to the equipment grounding conductor shall be done in accordance with Part VI of Article 250. [430.245](https://2023.antflix.net#430.245) | https://2023.antflix.net#430.245 |
Chapter 4 Equipment for General Use | 430.245(A) | Where the wiring to motors is metal-enclosed cable or in metal raceways, junction boxes to house motor terminals shall be provided, and the armor of the cable or the metal raceways shall be connected to them in accordance with 250.96(A) and 250.97. [430.245(A)](https://2023.antflix.net#430.245(A)) | https://2023.antflix.net#430.245(A) |
Chapter 4 Equipment for General Use | 430.245(B) | The junction box required by 430.245(A) shall be permitted to be separated from the motor by not more than 1.8 m (6 ft) if the leads to the motor are stranded conductors within Type AC cable, interlocked metal tape Type MC cable where listed and identified in accordance with 250.118(A)(10)b., or armored cord or are stranded leads enclosed in liquidtight flexible metal conduit, flexible metal conduit, intermediate metal conduit, rigid metal conduit, or electrical metallic tubing not smaller than metric designator 12 (trade size 3/8), with the armor or raceway being connected both to the motor and to the box. Liquidtight flexible nonmetallic conduit and rigid nonmetallic conduit shall be permitted to enclose the leads to the motor if the leads are stranded and the required equipment grounding conductor is connected to both the motor and to the box. Where stranded leads are used, protected as specified above, each strand within the conductor shall be not larger than 10 AWG and shall comply with other requirements of this Code for conductors to be used in raceways. [430.245(B)](https://2023.antflix.net#430.245(B)) | https://2023.antflix.net#430.245(B) |
Chapter 4 Equipment for General Use | 430.245(C) | Instrument transformer secondaries and exposed non-current-carrying metal or other conductive parts or cases of instrument transformers, meters, instruments, and relays shall be grounded in accordance with 250.170 through 250.178. [430.245(C)](https://2023.antflix.net#430.245(C)) | https://2023.antflix.net#430.245(C) |
Chapter 4 Equipment for General Use | divider_0_XIV | Table 430.247 Full-Load Current in Amperes, Direct-Current MotorsThe following values of full-load currents* are for motors running at base speed. Horsepower Armature Voltage Rating* 90 Volts 120 Volts 180 Volts 240 Volts 500 Volts 550 Volts 1/4 4.0 3.1 2.0 1.6 - - 1/3 5.2 4.1 2.6 2.0 - - 1/2 6.8 5.4 3.4 2.7 - - 3/4 9.6 7.6 4.8 3.8 - - 1 12.2 9.5 6.1 4.7 - - 11/2 - 13.2 8.3 6.6 - - 2 - 17 10.8 8.5 - - 3 - 25 16 12.2 - - 5 - 40 27 20 - - 71/2 - 58 - 29 13.6 12.2 10 - 76 - 38 18 16 15 - - - 55 27 24 20 - - - 72 34 31 25 - - - 89 43 38 30 - - - 106 51 46 40 - - - 140 67 61 50 - - - 173 83 75 60 - - - 206 99 90 75 - - - 255 123 111 100 - - - 341 164 148 125 - - - 425 205 185 150 - - - 506 246 222 200 - - - 675 330 294 *These are average dc quantities. Table 430.248 Full-Load Currents in Amperes, Single-Phase Alternating-Current MotorsThe following values of full-load currents are for motors running at usual speeds and motors with normal torque characteristics. The voltages listed are rated motor voltages. The currents listed shall be permitted for system voltage ranges of 110 to 120 and 220 to 240 volts. Horsepower 115 Volts 200 Volts 208 Volts 230 Volts 1/6 4.4 2.5 2.4 2.2 1/4 5.8 3.3 3.2 2.9 1/3 7.2 4.1 4.0 3.6 1/2 9.8 5.6 5.4 4.9 3/4 13.8 7.9 7.6 6.9 1 16 9.2 8.8 8.0 11/2 20 11.5 11.0 10 2 24 13.8 13.2 12 3 34 19.6 18.7 17 5 56 32.2 30.8 28 71/2 80 46.0 44.0 40 10 100 57.5 55.0 50 Table 430.249 Full-Load Current, Two-Phase Alternating-Current Motors (4-Wire)The following values of full-load current are for motors running at speeds usual for belted motors and motors with normal torque characteristics. Current in the common conductor of a 2-phase, 3-wire system will be 1.41 times the value given. The voltages listed are rated motor voltages. The currents listed shall be permitted for system voltage ranges of 110 to 120, 220 to 240, 440 to 480, 550 to 600, and 2300 to 2400 volts. Horsepower Induction-Type Squirrel Cage and Wound Rotor (Amperes) 115 Volts 230 Volts 460 Volts 575 Volts 2300 Volts 1/2 4.0 2.0 1.0 0.8 - 3/4 4.8 2.4 1.2 1.0 - 1 6.4 3.2 1.6 1.3 - 11/2 9.0 4.5 2.3 1.8 - 2 11.8 5.9 3.0 2.4 - 3 - 8.3 4.2 3.3 - 5 - 13.2 6.6 5.3 - 71/2 - 19 9.0 8.0 - 10 - 24 12 10 - 15 - 36 18 14 - 20 - 47 23 19 - 25 - 59 29 24 - 30 - 69 35 28 - 40 - 90 45 36 - 50 - 113 56 45 - 60 - 133 67 53 14 75 - 166 83 66 18 100 - 218 109 87 23 125 - 270 135 108 28 150 - 312 156 125 32 200 - 416 208 167 43 Table 430.250 Full-Load Current, Three-Phase Alternating-Current MotorsThe following values of full-load currents are typical for motors running at speeds usual for belted motors and motors with normal torque characteristics. The voltages listed are rated motor voltages. The currents listed shall be permitted for system voltage ranges of 110 to 120, 220 to 240, 440 to 480, 550 to 600, and 2300 to 2400 volts. Horsepower Induction-Type Squirrel Cage and Wound Rotor (Amperes) Synchronous-Type Unity Power Factor* (Amperes) 115 Volts 200 Volts 208 Volts 230 Volts 460 Volts 575 Volts 2300 Volts 230 Volts 460 Volts 575 Volts 2300 Volts 1/2 4.4 2.5 2.4 2.2 1.1 0.9 - - - - - 3/4 6.4 3.7 3.5 3.2 1.6 1.3 - - - - - 1 8.4 4.8 4.6 4.2 2.1 1.7 - - - - - 11/2 12.0 6.9 6.6 6.0 3.0 2.4 - - - - - 2 13.6 7.8 7.5 6.8 3.4 2.7 - - - - - 3 - 11.0 10.6 9.6 4.8 3.9 - - - - - 5 - 17.5 16.7 15.2 7.6 6.1 - - - - - 71/2 - 25.3 24.2 22 11 9 - - - - - 10 - 32.2 30.8 28 14 11 - - - - - 15 - 48.3 46.2 42 21 17 - - - - - 20 - 62.1 59.4 54 27 22 - - - - - 25 - 78.2 74.8 68 34 27 - 53 26 21 - 30 - 92 88 80 40 32 - 63 32 26 - 40 - 120 114 104 52 41 - 83 41 33 - 50 - 150 143 130 65 52 - 104 52 42 - 60 - 177 169 154 77 62 16 123 61 49 12 75 - 221 211 192 96 77 20 155 78 62 15 100 - 285 273 248 124 99 26 202 101 81 20 125 - 359 343 312 156 125 31 253 126 101 25 150 - 414 396 360 180 144 37 302 151 121 30 200 552 528 480 240 192 49 400 201 161 40 250 - - - - 302 242 60 - - - - 300 - - - - 361 289 72 - - - - 350 - - - - 414 336 83 - - - - 400 - - - - 477 382 95 - - - - 450 - - - - 515 412 103 - - - - 500 - - - - 590 472 118 - - - - *For 90 and 80 percent power factor, the figures shall be multiplied by 1.1 and 1.25, respectively. Table 430.251(A) Conversion Table of Single-Phase Locked-Rotor Currents for Selection of Disconnecting Means and Controllers as Determined from Horsepower and Voltage RatingFor use only with 430.110, 440.12, 440.41, and 455.8(C). Rated Horsepower Maximum Locked-Rotor Current in Amperes, Single-Phase 115 Volts 208 Volts 230 Volts 1/2 58.8 32.5 29.4 3/4 82.8 45.8 41.4 1 96 53 48 11/2 120 66 60 2 144 80 72 3 204 113 102 5 336 186 168 71/2 480 265 240 10 1000 332 300 Table 430.251 (B) Conversion Table of Polyphase Design B, C, and D Maximum Locked-Rotor Currents for Selection of Disconnecting Means and Controllers as Determined from Horsepower and Voltage Rating and Design LetterFor use only with 430.110, 440.12, 440.41, and 455.8(C). Rated Horsepower Maximum Motor Locked-Rotor Current in Amperes, Two- and Three-Phase, Design B, C and D* 115 Volts 200 Volts 208 Volts 230 Volts 460 Volts 575 Volts B, C, D B, C, D B, C, D B, C, D B, C, D B, C, D 1/2 40 23 22.1 20 10 8 3/4 50 28.8 27.6 25 12.5 10 1 60 34.5 33 30 15 12 11/2 80 46 44 40 20 16 2 100 57.5 55 50 25 20 3 - 73.6 71 64 32 25.6 5 - 105.8 102 92 46 36.8 71/2 - 146 140 127 63.5 50.8 10 - 186.3 179 162 81 64.8 15 - 267 257 232 116 93 20 - 334 321 290 145 116 25 - 420 404 365 183 146 30 - 500 481 435 218 174 40 - 667 641 580 290 232 50 - 834 802 725 363 290 60 - 1001 962 870 435 348 75 - 1248 1200 1085 543 434 100 - 1668 1603 1450 725 580 125 - 2087 2007 1815 908 726 150 - 2496 2400 2170 1085 868 200 - 3335 3207 2900 1450 1160 250 - - - - 1825 1460 300 - - - - 2200 1760 350 - - - - 2550 2040 400 - - - - 2900 2320 450 - - - - 3250 2600 500 - - - - 3625 2900 *Design A motors are not limited to a maximum starting current or locked rotor current. [divider_0_XIV](https://2023.antflix.net#divider_0_XIV) | https://2023.antflix.net#divider_0_XIV |
Chapter 4 Equipment for General Use | 440.1 | This article applies to electric motor-driven airconditioning and refrigerating equipment and to the branch circuits and controllers for such equipment. It provides for the special considerations necessary for circuits supplying hermetic refrigerant motor-compressors and for any air-conditioning or refrigerating equipment that is supplied from a branch circuit that supplies a hermetic refrigerant motor-compressor. [440.1](https://2023.antflix.net#440.1) | https://2023.antflix.net#440.1 |
Chapter 4 Equipment for General Use | 440.4(A) | A hermetic refrigerant motor-compressor shall be provided with a nameplate that shall indicate the manufacturer's name, trademark, or symbol; identifying designation; phase; voltage; and frequency. The rated-load current in amperes of the motor-compressor shall be marked by the equipment manufacturer on either or both the motor-compressor nameplate and the nameplate of the equipment in which the motor-compressor is used. The locked-rotor current of each single-phase motor-compressor having a rated-load current of more than 9 amperes at 115 volts, or more than 4.5 amperes at 230 volts, and each polyphase motor-compressor shall be marked on the motor-compressor nameplate. Where a thermal protector complying with 440.52(A)(2) and (B)(2) is used, the motor-compressor nameplate or the equipment nameplate shall be marked with the words "thermally protected." Where a protective system complying with 440.52(A)(4) and (B)(4) is used and is furnished with the equipment, the equipment nameplate shall be marked with the words, "thermally protected system." Where a protective system complying with 440.52(A)(4) and (B)(4) is specified, the equipment nameplate shall be appropriately marked. [440.4(A)](https://2023.antflix.net#440.4(A)) | https://2023.antflix.net#440.4(A) |
Chapter 4 Equipment for General Use | 440.4(B) | Multimotor and combination-load equipment shall be provided with a risible nameplate marked with the maker's name, the rating in volts, frequency and number of phases, minimum supply circuit conductor ampacity, the maximum rating of the branch-circuit short-circuit and ground-fault protective device, and the short-circuit current rating of the motor controllers or industrial control panel. The ampacity shall be calculated by using Part IV and counting all the motors and other loads that will be operated at the same time. The branch-circuit short-circuit and ground-fault protective device rating shall not exceed the value calculated by using Part III. Multimotor or combination-load equipment for use on two or more circuits shall be marked with the above information for each circuit. Exception No. 1: Multimotor and combination-load equipment that is suitable under the provisions of this article for connection to a single 15- or 20-ampere, 120-volt, or a 15-ampere, 208- or 240-volt, single-phase branch circuit shall be permitted to be marked as a single load. Exception No. 2: The minimum supply circuit conductor ampacity and the maximum rating of the branch-circuit short-circuit and ground-fault protective device shall not be required to be marked on a room air conditioner complying with 440.62(A). Exception No. 3: Multimotor and combination-load equipment used in one- and two-family dwellings or cord-and-attachment-plug-connected equipment shall not be required to be marked with a short-circuit current rating. [440.4(B)](https://2023.antflix.net#440.4(B)) | https://2023.antflix.net#440.4(B) |
Chapter 4 Equipment for General Use | 440.4(C) | A hermetic refrigerant motor-compressor, or equipment containing such a compressor, having a protection system that is approved for use with the motor-compressor that it protects and that permits continuous current in excess of the specified percentage of nameplate rated-load current given in 440.52(B)(2) or (B)(4) shall also be marked with a branch-circuit selection current that complies with 440.52(B)(2) or (B)(4). This marking shall be provided by the equipment manufacturer and shall be on the nameplate(s) where the rated-load current(s) appears. [440.4(C)](https://2023.antflix.net#440.4(C)) | https://2023.antflix.net#440.4(C) |
Chapter 4 Equipment for General Use | 440.5 | A controller shall be marked with the manufacturer's name, trademark, or symbol; identifying designation; voltage; phase; full-load and locked-rotor current (or horsepower) rating; and other data as may be needed to properly indicate the motor-compressor for which it is suitable. [440.5](https://2023.antflix.net#440.5) | https://2023.antflix.net#440.5 |
Chapter 4 Equipment for General Use | 440.6 | The size of conductors for equipment covered by this article shall be selected from Table 310.16 through Table 310.19 or calculated in accordance with 310.14 as applicable. The required ampacity of conductors and rating of equipment shall be determined according to 440.6(A) and 440.6(B). [440.6](https://2023.antflix.net#440.6) | https://2023.antflix.net#440.6 |
Chapter 4 Equipment for General Use | 440.6(A) | For a hermetic refrigerant motor-compressor, the rated-load current marked on the nameplate of the equipment in which the motor-compressor is employed shall be used in determining the rating or ampacity of the disconnecting means, the branch-circuit conductors, the controller, the branch-circuit short-circuit and ground-fault protection, and the separate motor overload protection. Where no rated-load current is shown on the equipment nameplate, the rated-load current shown on the compressor nameplate shall be used. Exception No. 1: Where so marked, the branch-circuit selection current shall be used instead of the rated-load current to determine the rating or ampacity of the disconnecting means, the branch-circuit conductors, the controller, and the branch-circuit short-circuit and ground-fault protection. Exception No. 2: For cord-and-plug-connected equipment, the nameplate marking shall be used in accordance with 440.22(B), Exception No. 2. [440.6(A)](https://2023.antflix.net#440.6(A)) | https://2023.antflix.net#440.6(A) |
Chapter 4 Equipment for General Use | 440.6(B) | For multimotor equipment employing a shaded-pole or permanent split-capacitor-type fan or blower motor, the full-load current for such motor marked on the nameplate of the equipment in which the fan or blower motor is employed shall be used instead of the horsepower rating to determine the ampacity or rating of the disconnecting means, the branch-circuit conductors, the controller, the branch-circuit short-circuit and ground-fault protection, and the separate overload protection. This marking on the equipment nameplate shall not be less than the current marked on the fan or blower motor nameplate. [440.6(B)](https://2023.antflix.net#440.6(B)) | https://2023.antflix.net#440.6(B) |
Chapter 4 Equipment for General Use | 440.7 | In determining compliance with this article and with 430.24, 430.53(B) and 430.53(C), and 430.62(A), the highest rated (largest) motor shall be considered to be the motor that has the highest rated-load current. Where two or more motors have the same highest rated-load current, only one of them shall be considered as the highest rated (largest) motor. For other than hermetic refrigerant motor-compressors, and fan or blower motors as covered in 440.6(B), the full-load current used to determine the highest rated motor shall be the equivalent value corresponding to the motor horsepower rating selected from Table 430.248, Table 430.249, or Table 430.250. Exception: Where so marked, the branch-circuit selection current shall be used instead of the rated-load current in determining the highest rated (largest) motor-compressor. [440.7](https://2023.antflix.net#440.7) | https://2023.antflix.net#440.7 |
Chapter 4 Equipment for General Use | 440.8 | An air-conditioning or refrigerating system shall be considered to be a single machine under the provisions of 430.87, Exception No. 1, and 430.112, Exception. The motors shall be permitted to be located remotely from each other. Air-conditioning and refrigeration equipment shall not be installed within a zone measured 900 mm (3 ft) horizontally and 2.5 m (8 ft) vertically from the top of a bathtub rim or shower stall threshold. The zone shall be all-encompassing and include the space directly over the tub or shower stall. [440.8](https://2023.antflix.net#440.8) | https://2023.antflix.net#440.8 |
Chapter 4 Equipment for General Use | 440.9 | Where equipment is installed outdoors on a roof, an equipment grounding conductor of the wire type shall be installed in outdoor portions of metallic raceway systems that use compression-type fittings. [440.9](https://2023.antflix.net#440.9) | https://2023.antflix.net#440.9 |
Chapter 4 Equipment for General Use | 440.10(A) | Motor controllers or industrial control panels of multimotor and combination-load equipment shall not be installed where the available fault current exceeds its short-circuit current rating as marked in accordance with 440.4(B). [440.10(A)](https://2023.antflix.net#440.10(A)) | https://2023.antflix.net#440.10(A) |
Chapter 4 Equipment for General Use | 440.10(B) | When motor controllers or industrial control panels of multimotor and combination-load equipment are required to be marked with a short circuit current rating, the available fault current 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. [440.10(B)](https://2023.antflix.net#440.10(B)) | https://2023.antflix.net#440.10(B) |
Chapter 4 Equipment for General Use | 440.11 | Disconnecting means shall be capable of disconnecting air-conditioning and refrigerating equipment, including motor-compressors and controllers, from the circuit conductors. If the disconnecting means is readily accessible to unqualified persons, any enclosure door or hinged cover of a disconnecting means enclosure that exposes energized parts when open shall require a tool to open or be capable of being locked. [440.11](https://2023.antflix.net#440.11) | https://2023.antflix.net#440.11 |
Chapter 4 Equipment for General Use | 440.12(A) | A disconnecting means serving a hermetic refrigerant motor-compressor shall be selected on the basis of the nameplate rated-load current or branch-circuit selection current, whichever is greater, and locked-rotor current, respectively, of the motor-compressor as follows. [440.12(A)](https://2023.antflix.net#440.12(A)) | https://2023.antflix.net#440.12(A) |
Chapter 4 Equipment for General Use | 440.12(A)(1) | The ampere rating shall be at least 115 percent of the nameplate rated-load current or branch-circuit selection current, whichever is greater. Exception: A listed unfused motor circuit switch, without fuseholders, having a horsepower rating not less than the equivalent horsepower determined in accordance with 440.12(A)(2) shall be permitted to have an ampere rating less than 115 percent of the specified current. [440.12(A)(1)](https://2023.antflix.net#440.12(A)(1)) | https://2023.antflix.net#440.12(A)(1) |
Chapter 4 Equipment for General Use | 440.12(A)(2) | To determine the equivalent horsepower in complying with the requirements of 430.109, the horsepower rating shall be selected from Table 430.248, Table 430.249, or Table 430.250 corresponding to the rated-load current or branch-circuit selection current, whichever is greater, and also the horsepower rating from Table 430.251(A) or Table 430.251(B) corresponding to the locked-rotor current. In case the nameplate rated-load current or branch-circuit selection current and locked-rotor current do not correspond to the currents shown in Table 430.248, Table 430.249, Table 430.250, Table 430.251(A), or Table 430.251(B), the horsepower rating corresponding to the next higher value shall be selected. In case different horsepower ratings are obtained when applying these tables, a horsepower rating at least equal to the larger of the values obtained shall be selected. [440.12(A)(2)](https://2023.antflix.net#440.12(A)(2)) | https://2023.antflix.net#440.12(A)(2) |
Chapter 4 Equipment for General Use | 440.12(B) | Where the combined load of two or more hermetic refrigerant motor-compressors or one or more hermetic refrigerant motor-compressor with other motors or loads may be simultaneous on a single disconnecting means, the rating for the disconnecting means shall be determined in accordance with 440.12(B)(1) and (B)(2). [440.12(B)](https://2023.antflix.net#440.12(B)) | https://2023.antflix.net#440.12(B) |
Chapter 4 Equipment for General Use | 440.12(B)(1) | The horsepower rating of the disconnecting means shall be determined from the sum of all currents, including resistance loads, at the rated-load condition and also at the locked-rotor condition. The combined rated-load current and the combined locked-rotor current so obtained shall be considered as a single motor for the purpose of this requirement as required by 440.12(B)(1)(a) and (B)(1)(b). The full-load current equivalent to the horsepower rating of each motor, other than a hermetic refrigerant motor-compressor, and fan or blower motors as covered in 440.6(B) shall be selected from Table 430.248, Table 430.249, or Table 430.250. These full-load currents shall be added to the motor-compressor rated-load current(s) or branch-circuit selection current(s), whichever is greater, and to the rating in amperes of other loads to obtain an equivalent full-load current for the combined load.The locked-rotor current equivalent to the horsepower rating of each motor, other than a hermetic refrigerant motor-compressor, shall be selected from Table 430.251(A) or Table 430.251(B), and, for fan and blower motors of the shaded-pole or permanent split-capacitor type marked with the locked-rotor current, the marked value shall be used. The locked-rotor currents shall be added to the motor-compressor locked-rotor current(s) and to the rating in amperes of other loads to obtain an equivalent locked-rotor current for the combined load. Where two or more motors or other loads such as resistance heaters, or both, cannot be started simultaneously, appropriate combinations of locked-rotor and rated-load current or branch-circuit selection current, whichever is greater, shall be an acceptable means of determining the equivalent locked-rotor current for the simultaneous combined load.Exception: Where part of the concurrent load is a resistance load and the disconnecting means is a switch rated in horsepower and amperes, the switch used shall be permitted to have a horsepower rating not less than the combined load to the motor-compressor(s) and other motor(s) at the locked-rotor condition, if the ampere rating of the switch is not less than this locked-rotor load plus the resistance load. [440.12(B)(1)](https://2023.antflix.net#440.12(B)(1)) | https://2023.antflix.net#440.12(B)(1) |
Chapter 4 Equipment for General Use | 440.12(B)(2) | The ampere rating of the disconnecting means shall be at least 115 percent of the sum of all currents at the rated-load condition determined in accordance with 440.12(B)(1). Exception: A listed unfused motor circuit switch, without fuseholders, having a horsepower rating not less than the equivalent horsepower determined by 440.12(B)(1) shall be permitted to have an ampere rating less than 115 percent of the sum of all currents. [440.12(B)(2)](https://2023.antflix.net#440.12(B)(2)) | https://2023.antflix.net#440.12(B)(2) |
Chapter 4 Equipment for General Use | 440.12(C) | For small motor-compressors not having the locked-rotor current marked on the nameplate, or for small motors not covered by Table 430.247, Table 430.248, Table 430.249, or Table 430.250, the locked-rotor current shall be assumed to be six times the rated-load current. [440.12(C)](https://2023.antflix.net#440.12(C)) | https://2023.antflix.net#440.12(C) |
Chapter 4 Equipment for General Use | 440.12(D) | Every disconnecting means in the refrigerant motor-compressor circuit between the point of attachment to the feeder and the point of connection to the refrigerant motor-compressor shall comply with the requirements of 440.12. [440.12(D)](https://2023.antflix.net#440.12(D)) | https://2023.antflix.net#440.12(D) |
Chapter 4 Equipment for General Use | 440.12(E) | Where the rated-load or locked-rotor current as determined above would indicate a disconnecting means rated in excess of 100 hp, 430.109(E) shall apply. [440.12(E)](https://2023.antflix.net#440.12(E)) | https://2023.antflix.net#440.12(E) |
Chapter 4 Equipment for General Use | 440.13 | For cord-connected equipment such as room air conditioners, household refrigerators and freezers, drinking water coolers, and beverage dispensers, a separable connector or an attachment plug and receptacle shall be permitted to serve as the disconnecting means. Informational Note: See 440.63 for room air conditioners. [440.13](https://2023.antflix.net#440.13) | https://2023.antflix.net#440.13 |
Chapter 4 Equipment for General Use | 440.14 | Disconnecting means shall be located within sight from, and readily accessible from, the air-conditioning or refrigerating equipment. The disconnecting means shall be permitted to be installed on or within the air-conditioning or refrigerating equipment. Disconnecting means shall meet the working space requirements of 110.26(A). The disconnecting means shall not be located on panels that are designed to allow access to the air-conditioning or refrigeration equipment or where it obscures the equipment nameplate(s). Exception No. 1: Where the disconnecting means provided in accordance with 430.102(A) is lockable in accordance with 110.25 and the refrigerating or air-conditioning equipment is essential to an industrial process in a facility with written safety procedures, and where the conditions of maintenance and supervision ensure that only qualified persons service the equipment, a disconnecting means within sight from the equipment shall not be required. Exception No. 2: Where an attachment plug and receptacle serve as the disconnecting means in accordance with 440.13, their location shall be accessible but shall not be required to be readily accessible. Informational Note: See Parts VII and IX of Article 430 for additional requirements. [440.14](https://2023.antflix.net#440.14) | https://2023.antflix.net#440.14 |
Chapter 4 Equipment for General Use | 440.21 | Part III specifies devices intended to protect the branch-circuit conductors, control apparatus, and motors in circuits supplying hermetic refrigerant motor-compressors against overcurrent due to short circuits and ground faults. They are in addition to or amendatory of the overcurrent protection requirements found elsewhere in this Code. [440.21](https://2023.antflix.net#440.21) | https://2023.antflix.net#440.21 |
Chapter 4 Equipment for General Use | 440.22(A) | The motor-compressor branch-circuit short-circuit and ground-fault protective device shall be capable of carrying the starting current of the motor. A protective device having a rating or setting not exceeding 175 percent of the motor-compressor rated-load current or branch-circuit selection current, whichever is greater, shall be permitted. Exception No. 1: If the values for branch-circuit short-circuit and ground-fault protection in accordance with 440.22(A) do not correspond to the standard sizes or ratings of fuses, nonadjustable circuit breakers, thermal protective devices, or available settings of adjustable circuit breakers, a higher size, rating, or available setting that does not exceed the next higher standard ampere rating shall be permitted. Exception No. 2: If the values for branch-circuit short-circuit and ground-fault protection in accordance with 440.22(A) or the rating modified by Exception No. 1 is not sufficient for the starting current of the motor, the rating or setting shall be permitted to be increased but shall not exceed 225 percent of the motor rated-load current or branch-circuit selection current, whichever is greater. Exception No. 3: The rating of the branch-circuit short-circuit and ground-fault protective device shall not be required to be less than 15 amperes. [440.22(A)](https://2023.antflix.net#440.22(A)) | https://2023.antflix.net#440.22(A) |
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