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Chapter 4 Equipment for General Use | 427.25 | All accessible external surfaces of the pipeline, vessel, or both, being heated shall be physically guarded, isolated, or thermally insulated (with a weatherproof jacket for outside installations) to protect against contact by personnel in the area. [427.25](https://2023.antflix.net#427.25) | https://2023.antflix.net#427.25 |
Chapter 4 Equipment for General Use | 427.26 | A dual-winding transformer with a grounded shield between the primary and secondary windings shall be used to isolate the distribution system from the heating system. [427.26](https://2023.antflix.net#427.26) | https://2023.antflix.net#427.26 |
Chapter 4 Equipment for General Use | 427.27 | The secondary winding of the isolation transformer connected to the pipeline or vessel being heated shall not have an output voltage greater than 30 volts ac. Exception No. 1: In industrial establishments, the isolation transformer connected to the pipeline or vessel being heated shall be permitted to have an output vo... | https://2023.antflix.net#427.27 |
Chapter 4 Equipment for General Use | 427.28 | All current-carrying components shall be installed in accordance with 300.20. [427.28](https://2023.antflix.net#427.28) | https://2023.antflix.net#427.28 |
Chapter 4 Equipment for General Use | 427.29 | The pipeline, vessel, or both, that is being heated and operating at a voltage greater than 30 but not more than 80 shall be grounded at designated points. [427.29](https://2023.antflix.net#427.29) | https://2023.antflix.net#427.29 |
Chapter 4 Equipment for General Use | 427.30 | The ampacity of the conductors connected to the secondary of the transformer shall be at least 100 percent of the total load of the heater. [427.30](https://2023.antflix.net#427.30) | https://2023.antflix.net#427.30 |
Chapter 4 Equipment for General Use | 427.36 | Induction coils that operate or may operate at a voltage greater than 30 volts ac shall be enclosed in a nonmetallic or split metallic enclosure, isolated, or made inaccessible by location to protect personnel in the area. [427.36](https://2023.antflix.net#427.36) | https://2023.antflix.net#427.36 |
Chapter 4 Equipment for General Use | 427.37 | Induction coils shall be prevented from inducing circulating currents in surrounding metallic equipment, supports, or structures by shielding, isolation, or insulation of the current paths. Stray current paths shall be bonded to prevent arcing. [427.37](https://2023.antflix.net#427.37) | https://2023.antflix.net#427.37 |
Chapter 4 Equipment for General Use | 427.45 | The ampacity of the electrically insulated conductor inside the ferromagnetic envelope shall be permitted to exceed the values given in Table 310.16, provided it is identified as suitable for this use. [427.45](https://2023.antflix.net#427.45) | https://2023.antflix.net#427.45 |
Chapter 4 Equipment for General Use | 427.46 | Pull boxes for pulling the electrically insulated conductor in the ferromagnetic envelope shall be permitted to be buried under the thermal insulation, provided their locations are indicated by permanent markings on the insulation jacket surface and on drawings. For outdoor installations, pull boxes shall be of waterti... | https://2023.antflix.net#427.46 |
Chapter 4 Equipment for General Use | 427.47 | The provisions of 300.20 shall not apply to the installation of a single conductor in a ferromagnetic envelope (metal enclosure). [427.47](https://2023.antflix.net#427.47) | https://2023.antflix.net#427.47 |
Chapter 4 Equipment for General Use | 427.48 | The ferromagnetic envelope shall be grounded at both ends, and, in addition, it shall be permitted to be grounded at intermediate points as required by its design. The ferromagnetic envelope shall be bonded at all joints to ensure electrical continuity. The provisions of 250.30 shall not apply to the installation of sk... | https://2023.antflix.net#427.48 |
Chapter 4 Equipment for General Use | 427.55(A) | Means shall be provided to simultaneously disconnect all fixed electric pipeline or vessel heating equipment from all ungrounded conductors. The branch-circuit switch or circuit breaker, where readily accessible to the user of the equipment, shall be permitted to serve as the disconnecting means. The disconnecting mean... | https://2023.antflix.net#427.55(A) |
Chapter 4 Equipment for General Use | 427.55(B) | The factory-installed attachment plug of cord-and-plug-connected equipment rated 20 amperes or less and 150 volts or less to ground shall be permitted to be the disconnecting means. [427.55(B)](https://2023.antflix.net#427.55(B)) | https://2023.antflix.net#427.55(B) |
Chapter 4 Equipment for General Use | 427.56(A) | Temperature-controlled switching devices that indicate an "off" position and that interrupt line current shall open all ungrounded conductors when the control device is in this "off" position. These devices shall not be permitted to serve as the disconnecting means unless capable of being locked in the open position. [... | https://2023.antflix.net#427.56(A) |
Chapter 4 Equipment for General Use | 427.56(B) | Temperature controlled switching devices that do not have an "off" position shall not be required to open all ungrounded conductors and shall not be permitted to serve as the disconnecting means. [427.56(B)](https://2023.antflix.net#427.56(B)) | https://2023.antflix.net#427.56(B) |
Chapter 4 Equipment for General Use | 427.56(C) | Remote controlled temperature-actuated devices shall not be required to meet the requirements of 427.56(A) and (B). These devices shall not be permitted to serve as the disconnecting means. [427.56(C)](https://2023.antflix.net#427.56(C)) | https://2023.antflix.net#427.56(C) |
Chapter 4 Equipment for General Use | 427.56(D) | Switching devices consisting of combined temperature-actuated devices and manually controlled switches that serve both as the controllers and the disconnecting means shall comply with all the following conditions: Open all ungrounded conductors when manually placed in the "off" positionBe designed so that the circuit c... | https://2023.antflix.net#427.56(D) |
Chapter 4 Equipment for General Use | 427.57 | Heating equipment shall be considered protected against overcurrent where supplied by a branch circuit as specified in 210.20 and 210.24. [427.57](https://2023.antflix.net#427.57) | https://2023.antflix.net#427.57 |
Chapter 4 Equipment for General Use | 430.1 | This article covers motors, motor branch-circuit and feeder conductors and their protection, motor overload protection, motor control circuits, motor controllers, and motor control centers.
Informational Note Figure 430.1 Article 430 Contents.
Informational Note No. 1: See Informational Note Figure 430.1 for the arran... | https://2023.antflix.net#430.1 |
Chapter 4 Equipment for General Use | 430.2 | Reconditioned motors shall be permitted if the reconditioning has been conducted in accordance with the manufacturer's instructions or, if no instructions are provided, nationally recognized standards. Reconditioned motors identified for use in hazardous (classified) locations shall be listed as reconditioned if instal... | https://2023.antflix.net#430.2 |
Chapter 4 Equipment for General Use | 430.4 | Where separate overload devices are used with a standard part-winding start induction motor, each half of the motor winding shall be individually protected in accordance with 430.32 and 430.37 with a trip current one-half that specified.Each motor-winding connection shall have branch-circuit short-circuit and ground-fa... | https://2023.antflix.net#430.4 |
Chapter 4 Equipment for General Use | 430.5 | Motors and controllers shall also comply with the applicable provisions of Table 430.5.Table 430.5 Other Articles
Equipment/Occupancy
Article
Section
Air-conditioning and refrigerating equipment
440
Capacitors
460.8, 460.9
Commercial garages; aircraft hangars; motor fuel dispensing facilities; ... | https://2023.antflix.net#430.5 |
Chapter 4 Equipment for General Use | 430.6 | The size of conductors supplying equipment covered by this article shall be selected from the ampacity tables in 310.15 or shall be calculated in accordance with 310.14(B). Where flexible cord is used, the size of the conductor shall be selected in accordance with 400.5. The required conductor ampacity and motor rating... | https://2023.antflix.net#430.6 |
Chapter 4 Equipment for General Use | 430.6(A) | For general motor applications, current ratings shall be determined based on 430.6(A)(1) and (A)(2). [430.6(A)](https://2023.antflix.net#430.6(A)) | https://2023.antflix.net#430.6(A) |
Chapter 4 Equipment for General Use | 430.6(A)(1) | Other than for motors built for low speeds (less than 1200 RPM) or high torques, and for multispeed motors, the values given in Table 430.247, Table 430.248, Table 430.249, and Table 430.250 shall be used instead of the actual current rating marked on the motor nameplate to determine the following: Ampacity of conducto... | https://2023.antflix.net#430.6(A)(1) |
Chapter 4 Equipment for General Use | 430.6(A)(2) | The motor nameplate current ratings shall be used to determine the values for the following: Separate motor overload protectionFor motors built for low speeds (less than 1200 RPM), high torques, canned pumps, or multispeed motors, the following:Ampacity of conductorsCurrent ratings of switchesCurrent ratings of branch-... | https://2023.antflix.net#430.6(A)(2) |
Chapter 4 Equipment for General Use | 430.6(B) | For torque motors, the rated current shall be locked-rotor current, and this nameplate current shall be used to determine the ampacity of the branch-circuit conductors covered in 430.22 and 430.24, the current rating of the motor overload protection, and the current rating of motor branch-circuit short-circuit and grou... | https://2023.antflix.net#430.6(B) |
Chapter 4 Equipment for General Use | 430.6(C) | For motors used in alternating-current, adjustable voltage, variable torque drive systems, the ampacity of conductors, or current ratings of switches, branch-circuit short-circuit and ground-fault protection, and so forth, shall be based on the maximum operating current marked on the motor nameplate or the control name... | https://2023.antflix.net#430.6(C) |
Chapter 4 Equipment for General Use | 430.6(D) | For valve actuator motor assemblies (VAMs), the rated current shall be the name-plate full-load current, and this current shall be used to determine the maximum rating or setting of the motor branch-circuit short-circuit and ground-fault protective device and the ampacity of the conductors. [430.6(D)](https://2023.antf... | https://2023.antflix.net#430.6(D) |
Chapter 4 Equipment for General Use | 430.7(A) | A motor shall be marked with the following information: Manufacturer's name.Rated volts and full-load current. For a multispeed motor, full-load current for each speed, except shaded-pole and permanent-split capacitor motors where amperes are required only for maximum speed.Rated frequency and number of phases if an ac... | https://2023.antflix.net#430.7(A) |
Chapter 4 Equipment for General Use | 430.7(B) | Code letters marked on motor nameplates to show motor input with locked rotor shall be in accordance with Table 430.7(B). The code letter indicating motor input with locked rotor shall be in an individual block on the nameplate, properly designated.Table 430.7(B) Locked-Rotor Indicating Code Letters
Code Lette... | https://2023.antflix.net#430.7(B) |
Chapter 4 Equipment for General Use | 430.7(B)(1) | Multispeed motors shall be marked with the code letter designating the locked-rotor kilovolt-ampere (kVA) per horsepower (hp) for the highest speed at which the motor can be started. Exception: Constant horsepower multispeed motors shall be marked with the code letter giving the highest locked-rotor kilovolt-ampere (kV... | https://2023.antflix.net#430.7(B)(1) |
Chapter 4 Equipment for General Use | 430.7(B)(2) | Single-speed motors starting on wye connection and running on delta connections shall be marked with a code letter corresponding to the locked-rotor kilovolt-ampere (kVA) per horsepower (hp) for the wye connection. [430.7(B)(2)](https://2023.antflix.net#430.7(B)(2)) | https://2023.antflix.net#430.7(B)(2) |
Chapter 4 Equipment for General Use | 430.7(B)(3) | Dual-voltage motors that have a different locked-rotor kilovolt-ampere (kVA) per horsepower (hp) on the two voltages shall be marked with the code letter for the voltage giving the highest locked-rotor kilovolt-ampere (kVA) per horsepower (hp). [430.7(B)(3)](https://2023.antflix.net#430.7(B)(3)) | https://2023.antflix.net#430.7(B)(3) |
Chapter 4 Equipment for General Use | 430.7(B)(4) | Motors with 50- and 60-Hz ratings shall be marked with a code letter designating the locked-rotor kilovolt-ampere (kVA) per horsepower (hp) on 60 Hz. [430.7(B)(4)](https://2023.antflix.net#430.7(B)(4)) | https://2023.antflix.net#430.7(B)(4) |
Chapter 4 Equipment for General Use | 430.7(B)(5) | Part-winding start motors shall be marked with a code letter designating the locked-rotor kilovolt-ampere (kVA) per horsepower (hp) that is based on the locked-rotor current for the full winding of the motor. [430.7(B)(5)](https://2023.antflix.net#430.7(B)(5)) | https://2023.antflix.net#430.7(B)(5) |
Chapter 4 Equipment for General Use | 430.7(C) | Torque motors are rated for operation at standstill and shall be marked in accordance with 430.7(A), except that locked-rotor torque shall replace horsepower. [430.7(C)](https://2023.antflix.net#430.7(C)) | https://2023.antflix.net#430.7(C) |
Chapter 4 Equipment for General Use | 430.7(D)(1) | Multimotor and combination-load equipment shall be provided with a visible nameplate marked with the manufacturer's name, the rating in volts, frequency, number of phases, minimum supply circuit conductor ampacity, and the maximum ampere rating of the circuit short-circuit and ground-fault protective device. The conduc... | https://2023.antflix.net#430.7(D)(1) |
Chapter 4 Equipment for General Use | 430.7(D)(2) | Where the equipment is not factory-wired and the individual nameplates of motors and other loads are visible after assembly of the equipment, the individual nameplates shall be permitted to serve as the required marking. [430.7(D)(2)](https://2023.antflix.net#430.7(D)(2)) | https://2023.antflix.net#430.7(D)(2) |
Chapter 4 Equipment for General Use | 430.8 | A motor controller shall be marked with the manufacturer's name or identification, the voltage, the current or horsepower rating, the short-circuit current rating, and other necessary data to properly indicate the applications for which it is suitable. Exception No. 1: The short-circuit current rating is not required f... | https://2023.antflix.net#430.8 |
Chapter 4 Equipment for General Use | 430.9(A) | Terminals of motors and controllers shall be suitably marked or colored where necessary to indicate the proper connections. [430.9(A)](https://2023.antflix.net#430.9(A)) | https://2023.antflix.net#430.9(A) |
Chapter 4 Equipment for General Use | 430.9(B) | Motor controllers and terminals of control circuit devices shall be connected with copper conductors unless identified for use with a different conductor. [430.9(B)](https://2023.antflix.net#430.9(B)) | https://2023.antflix.net#430.9(B) |
Chapter 4 Equipment for General Use | 430.9(C) | Control circuit devices with screw-type pressure terminals used with 14 AWG or smaller copper conductors shall be torqued to a minimum of 0.8 N-m (7 lb-in.) unless identified for a different torque value. [430.9(C)](https://2023.antflix.net#430.9(C)) | https://2023.antflix.net#430.9(C) |
Chapter 4 Equipment for General Use | 430.10(A) | Enclosures for motor controllers and disconnecting means shall not be used as junction boxes, auxiliary gutters, or raceways for conductors feeding through or tapping off to the other apparatus unless designs are employed that provide adequate space for this purpose. Informational Note: See 312.8 for switch and overcur... | https://2023.antflix.net#430.10(A) |
Chapter 4 Equipment for General Use | 430.10(B) | Minimum wire-bending space within the enclosures for motor controllers shall be in accordance with Table 430.10(B) where measured in a straight line from the end of the lug or wire connector (in the direction the wire leaves the terminal) to the wall or barrier. Where alternate wire termination means are substituted fo... | https://2023.antflix.net#430.10(B) |
Chapter 4 Equipment for General Use | 430.11 | Suitable guards or enclosures shall be provided to protect exposed current-carrying parts of motors and the insulation of motor leads where installed directly under equipment, or in other locations where dripping or spraying oil, water, or other liquid is capable of occurring, unless the motor is designed for the exist... | https://2023.antflix.net#430.11 |
Chapter 4 Equipment for General Use | 430.12(A) | Where motors are provided with terminal housings, the housings shall be of metal and of substantial construction. Exception: In other than hazardous (classified) locations, substantial, nonmetallic, noncombustible housings shall be permitted, provided an internal grounding means between the motor frame and the equipmen... | https://2023.antflix.net#430.12(A) |
Chapter 4 Equipment for General Use | 430.12(B) | Where these terminal housings enclose wire-to-wire connections, they shall have minimum dimensions and usable volumes in accordance with Table 430.12(B).
Table 430.12(B) Terminal Housings — Wire-to-Wire Connections
Motors 275 mm (11 in.) in Diameter or Less
Horsepower
Cover Opening Minimum Dimension
Usable Volume ... | https://2023.antflix.net#430.12(B) |
Chapter 4 Equipment for General Use | 430.12(C) | Where these terminal housings enclose rigidly mounted motor terminals, the terminal housing shall be of sufficient size to provide minimum terminal spacings and usable volumes in accordance with Table 430.12(C)(1) and Table 430.12(C)(2).Table 430.12(C)(1) Terminal Spacings - Fixed Terminals
Nominal Volts
Minimum Spa... | https://2023.antflix.net#430.12(C) |
Chapter 4 Equipment for General Use | 430.12(D) | For motors with larger ratings, greater number of leads, or larger wire sizes, or where motors are installed as a part of factory-wired equipment, without additional connection being required at the motor terminal housing during equipment installation, the terminal housing shall be of ample size to make connections, bu... | https://2023.antflix.net#430.12(D) |
Chapter 4 Equipment for General Use | 430.12(E) | A means for attachment of an equipment grounding conductor termination in accordance with 250.8 shall be provided at motor terminal housings for wire-to-wire connections or fixed terminal connections. The means for such connections shall be permitted to be located either inside or outside the motor terminal housing. Ex... | https://2023.antflix.net#430.12(E) |
Chapter 4 Equipment for General Use | 430.13 | Where wires pass through an opening in an enclosure, conduit box, or barrier, a bushing shall be used to protect the conductors from the edges of openings having sharp edges. The bushing shall have smooth, well-rounded surfaces where it may be in contact with the conductors. If used where oils, greases, or other contam... | https://2023.antflix.net#430.13 |
Chapter 4 Equipment for General Use | 430.14(A) | Motors shall be located so that adequate ventilation is provided and so that maintenance, such as lubrication of bearings and replacing of brushes, can be readily accomplished. Exception: Ventilation shall not be required for submersible types of motors. [430.14(A)](https://2023.antflix.net#430.14(A)) | https://2023.antflix.net#430.14(A) |
Chapter 4 Equipment for General Use | 430.14(B) | Open motors that have commutators or collector rings shall be located or protected so that sparks cannot reach adjacent combustible material. Exception: Installation of these motors on wooden floors or supports shall be permitted. [430.14(B)](https://2023.antflix.net#430.14(B)) | https://2023.antflix.net#430.14(B) |
Chapter 4 Equipment for General Use | 430.16 | In locations where dust or flying material collects on or in motors in such quantities as to seriously interfere with the ventilation or cooling of motors and thereby cause dangerous temperatures, suitable types of enclosed motors that do not overheat under the prevailing conditions shall be used. Informational Note: E... | https://2023.antflix.net#430.16 |
Chapter 4 Equipment for General Use | 430.17 | In determining compliance with 430.24, 430.53(B), and 430.53(C), the highest rated or smallest rated motor shall be based on the rated full-load current as selected from Table 430.247, Table 430.248, Table 430.249, and Table 430.250. [430.17](https://2023.antflix.net#430.17) | https://2023.antflix.net#430.17 |
Chapter 4 Equipment for General Use | 430.18 | The nominal value of the ac voltage being rectified shall be used to determine the voltage of a rectifier derived system. Exception: The nominal dc voltage of the rectifier shall be used if it exceeds the peak value of the ac voltage being rectified. [430.18](https://2023.antflix.net#430.18) | https://2023.antflix.net#430.18 |
Chapter 4 Equipment for General Use | 430.21 | Part II specifies ampacities of conductors that are capable of carrying the motor current without overheating under the conditions specified.
Part II shall not apply to motor circuits rated over 1000 volts, nominal.
Informational Note No. 1: See Part XI for motor circuits rated over 1000 volts, nominal.
Informational N... | https://2023.antflix.net#430.21 |
Chapter 4 Equipment for General Use | 430.22 | Conductors that supply a single motor used in a continuous duty application shall have an ampacity of not less than 125 percent of the motor full-load current rating, as determined by 430.6(A)(1), or not less than specified in 430.22(A) through (G). [430.22](https://2023.antflix.net#430.22) | https://2023.antflix.net#430.22 |
Chapter 4 Equipment for General Use | 430.22(A) | For dc motors operating from a rectified power supply, the conductor ampacity on the input of the rectifier shall not be less than 125 percent of the rated input current to the rectifier. For dc motors operating from a rectified single-phase power supply, the conductors between the field wiring output terminals of the ... | https://2023.antflix.net#430.22(A) |
Chapter 4 Equipment for General Use | 430.22(B) | For a multispeed motor, the selection of branch-circuit conductors on the line side of the controller shall be based on the highest of the full-load current ratings shown on the motor nameplate. The ampacity of the branch-circuit conductors between the controller and the motor shall not be less than 125 percent of the ... | https://2023.antflix.net#430.22(B) |
Chapter 4 Equipment for General Use | 430.22(C) | For a wye-start, delta-run connected motor, the ampacity of the branch-circuit conductors on the line side of the controller shall not be less than 125 percent of the motor full-load current as determined by 430.6(A)(1). The ampacity of the conductors between the controller and the motor shall not be less than 72 perce... | https://2023.antflix.net#430.22(C) |
Chapter 4 Equipment for General Use | 430.22(D) | For a part-winding connected motor, the ampacity of the branch-circuit conductors on the line side of the controller shall not be less than 125 percent of the motor full-load current as determined by 430.6(A)(1). The ampacity of the conductors between the controller and the motor shall not be less than 62.5 percent of ... | https://2023.antflix.net#430.22(D) |
Chapter 4 Equipment for General Use | 430.22(E) | Conductors for a motor used in a short-time, intermittent, periodic, or varying duty application shall have an ampacity of not less than the percentage of the motor nameplate current rating shown in Table 430.22(E), unless the authority having jurisdiction grants special permission for conductors of lower ampacity. Tab... | https://2023.antflix.net#430.22(E) |
Chapter 4 Equipment for General Use | 430.22(F) | The conductors between a stationary motor rated 1 hp or less and the separate terminal enclosure permitted in 430.245(B) shall be permitted to be smaller than 14 AWG but not smaller than 18 AWG, provided they have an ampacity as specified in 430.22. [430.22(F)](https://2023.antflix.net#430.22(F)) | https://2023.antflix.net#430.22(F) |
Chapter 4 Equipment for General Use | 430.22(G) | Conductors for small motors shall not be smaller than 14 AWG unless otherwise permitted in 430.22(G)(1) or (G)(2). [430.22(G)](https://2023.antflix.net#430.22(G)) | https://2023.antflix.net#430.22(G) |
Chapter 4 Equipment for General Use | 430.22(G)(1) | 18 AWG individual copper conductors installed in a cabinet or enclosure, copper conductors that are part of a jacketed multiconductor cable assembly, or copper conductors in a flexible cord shall be permitted, under either of the following sets of conditions: The circuit supplies a motor with a full load current rating... | https://2023.antflix.net#430.22(G)(1) |
Chapter 4 Equipment for General Use | 430.22(G)(2) | 16 AWG individual copper conductors installed in a cabinet or enclosure, copper conductors that are part of a jacketed multiconductor cable assembly, or copper conductors in a flexible cord shall be permitted under either of the following sets of conditions: The circuit supplies a motor with a full-load current rating,... | https://2023.antflix.net#430.22(G)(2) |
Chapter 4 Equipment for General Use | 430.23(A) | For continuous duty, the conductors connecting the secondary of a wound-rotor ac motor to its controller shall have an ampacity not less than 125 percent of the full-load secondary current of the motor. [430.23(A)](https://2023.antflix.net#430.23(A)) | https://2023.antflix.net#430.23(A) |
Chapter 4 Equipment for General Use | 430.23(B) | For other than continuous duty, these conductors shall have an ampacity, in percent of full-load secondary current, not less than that specified in Table 430.22(E). [430.23(B)](https://2023.antflix.net#430.23(B)) | https://2023.antflix.net#430.23(B) |
Chapter 4 Equipment for General Use | 430.23(C) | Where the secondary resistor is separate from the controller, the ampacity of the conductors between controller and resistor shall not be less than that shown in Table 430.23(C).
Table 430.23(C) Secondary Conductor
Resistor Duty Classification
Ampacity of Conductor in Percent of Full-Load Secondary Current
Light... | https://2023.antflix.net#430.23(C) |
Chapter 4 Equipment for General Use | 430.24 | Conductors supplying several motors, or a motor(s) and other load(s), shall have an ampacity not less than the sum of each of the following: 125 percent of the full-load current rating of the highest rated motor, as determined by 430.6(A)Sum of the full-load current ratings of all the other motors in the group, as dete... | https://2023.antflix.net#430.24 |
Chapter 4 Equipment for General Use | 430.25 | The ampacity of the conductors supplying multimotor and combination-load equipment shall not be less than the minimum circuit ampacity marked on the equipment in accordance with 430.7(D). Where the equipment is not factory-wired and the individual nameplates are visible in accordance with 430.7(D)(2), the conductor amp... | https://2023.antflix.net#430.25 |
Chapter 4 Equipment for General Use | 430.26 | Where reduced heating of the conductors results from motors operating on duty-cycle, intermittently, or from all motors not operating at one time, the authority having jurisdiction may grant permission for feeder conductors to have an ampacity less than specified in 430.24, provided the conductors have sufficient ampac... | https://2023.antflix.net#430.26 |
Chapter 4 Equipment for General Use | 430.27 | Where capacitors are installed in motor circuits, conductors shall comply with 460.8 and 460.9. [430.27](https://2023.antflix.net#430.27) | https://2023.antflix.net#430.27 |
Chapter 4 Equipment for General Use | 430.28 | Feeder tap conductors shall have an ampacity not less than that required by Part II, shall terminate in a branch-circuit protective device, and, in addition, shall meet one of the following requirements: Be enclosed either by an enclosed controller or by a race-way, be not more than 3.0 m (10 ft) in length, and, for fi... | https://2023.antflix.net#430.28 |
Chapter 4 Equipment for General Use | 430.29 | Conductors connecting the motor controller to separately mounted power accelerating and dynamic braking resistors in the armature circuit shall have an ampacity not less than the value calculated from Table 430.29 using motor full-load current. If an armature shunt resistor is used, the power accelerating resistor cond... | https://2023.antflix.net#430.29 |
Chapter 4 Equipment for General Use | 430.31 | Part III specifies overload devices intended to protect motors, motor-control apparatus, and motor branch-circuit conductors against excessive heating due to motor overloads and failure to start. Informational Note No. 1: See Informative Annex D, Example D8. Informational Note No. 2: See Article 100 for the definition ... | https://2023.antflix.net#430.31 |
Chapter 4 Equipment for General Use | 430.31(A) | These provisions shall not require overload protection where a power loss would cause a hazard, such as in the case of fire pumps. Informational Note: See 695.7 for protection of fire pump supply conductors. [430.31(A)](https://2023.antflix.net#430.31(A)) | https://2023.antflix.net#430.31(A) |
Chapter 4 Equipment for General Use | 430.31(B) | Part III shall not apply to motor circuits rated over 1000 volts, nominal. Informational Note: See Part XI for over 1000 volts, nominal. [430.31(B)](https://2023.antflix.net#430.31(B)) | https://2023.antflix.net#430.31(B) |
Chapter 4 Equipment for General Use | 430.32(A) | Each motor used in a continuous duty application and rated more than 1 hp shall be protected against overload by one of the means in 430.32(A)(1) through (A)(4). [430.32(A)](https://2023.antflix.net#430.32(A)) | https://2023.antflix.net#430.32(A) |
Chapter 4 Equipment for General Use | 430.32(A)(1) | A separate overload device that is responsive to motor current. This device shall be selected to trip or shall be rated at no more than the following percent of the motor nameplate full-load current rating: Motors with a marked service factor 1.15 or greater 125% Motors with a marked temperature rise 40°C or less ... | https://2023.antflix.net#430.32(A)(1) |
Chapter 4 Equipment for General Use | 430.32(A)(2) | A thermal protector integral with the motor shall be approved for use with the motor it protects on the basis that it will prevent dangerous overheating of the motor due to overload and failure to start. An electronically protected motor shall be approved for use on the basis that it will prevent dangerous overheating ... | https://2023.antflix.net#430.32(A)(2) |
Chapter 4 Equipment for General Use | 430.32(A)(3) | A protective device integral with a motor that will protect the motor against damage due to failure to start shall be permitted if the motor is part of an approved assembly that does not normally subject the motor to overloads. [430.32(A)(3)](https://2023.antflix.net#430.32(A)(3)) | https://2023.antflix.net#430.32(A)(3) |
Chapter 4 Equipment for General Use | 430.32(A)(4) | For motors larger than 1500 hp, a protective device having embedded temperature detectors that cause current to the motor to be interrupted when the motor attains a temperature rise greater than marked on the nameplate in an ambient temperature of 40°C. [430.32(A)(4)](https://2023.antflix.net#430.32(A)(4)) | https://2023.antflix.net#430.32(A)(4) |
Chapter 4 Equipment for General Use | 430.32(B) | Any motor of 1 hp or less that is started automatically shall be protected against overload by one of the following means. [430.32(B)](https://2023.antflix.net#430.32(B)) | https://2023.antflix.net#430.32(B) |
Chapter 4 Equipment for General Use | 430.32(B)(1) | By a separate overload device following the requirements of 430.32(A)(1). For a multispeed motor, each winding connection shall be considered separately. Modification of this value shall be permitted as provided in 430.32(C). [430.32(B)(1)](https://2023.antflix.net#430.32(B)(1)) | https://2023.antflix.net#430.32(B)(1) |
Chapter 4 Equipment for General Use | 430.32(B)(2) | A thermal protector integral with the motor shall be approved for use with the motor that it protects on the basis that it will prevent dangerous overheating of the motor due to overload and failure to start. An electronically protected motor shall be approved for use on the basis that it will prevent dangerous overhea... | https://2023.antflix.net#430.32(B)(2) |
Chapter 4 Equipment for General Use | 430.32(B)(3) | A protective device integral with a motor that protects the motor against damage due to failure to start shall be permitted (1) if the motor is part of an approved assembly that does not subject the motor to overloads, or (2) if the assembly is also equipped with other safety controls (such as the safety combustion con... | https://2023.antflix.net#430.32(B)(3) |
Chapter 4 Equipment for General Use | 430.32(B)(4) | If the impedance of the motor windings is sufficient to prevent overheating due to failure to start, the motor shall be permitted to be protected as specified in 430.32(D)(2)a. for manually started motors if the motor is part of an approved assembly in which the motor will limit itself so that it will not be dangerousl... | https://2023.antflix.net#430.32(B)(4) |
Chapter 4 Equipment for General Use | 430.32(C) | Where the sensing element or setting or sizing of the overload device selected in accordance with 430.32(A)(1) and 430.32(B)(1) is not sufficient to start the motor or to carry the load, higher size sensing elements or incremental settings or sizing shall be permitted to be used, provided the trip current of the overlo... | https://2023.antflix.net#430.32(C) |
Chapter 4 Equipment for General Use | 430.32(D)(1) | Overload protection shall be in accordance with 430.32(B). [430.32(D)(1)](https://2023.antflix.net#430.32(D)(1)) | https://2023.antflix.net#430.32(D)(1) |
Chapter 4 Equipment for General Use | 430.32(D)(2) | Within Sight from Controller. Overload protection shall be permitted to be furnished by the branch-circuit short-circuit and ground-fault protective device; such device, however, shall not be larger than that specified in Part IV of Article 430.Exception: Any such motor shall be permitted on a nominal 120-volt branch c... | https://2023.antflix.net#430.32(D)(2) |
Chapter 4 Equipment for General Use | 430.32(E) | The secondary circuits of wound-rotor ac motors, including conductors, controllers, resistors, and so forth, shall be permitted to be protected against overload by the motor-overload device. [430.32(E)](https://2023.antflix.net#430.32(E)) | https://2023.antflix.net#430.32(E) |
Chapter 4 Equipment for General Use | 430.33 | A motor used for a condition of service that is inherently short-time, intermittent, periodic, or varying duty, as illustrated by Table 430.22(E), shall be permitted to be protected against overload by the branch-circuit short-circuit and ground-fault protective device, provided the protective device rating or setting ... | https://2023.antflix.net#430.33 |
Chapter 4 Equipment for General Use | 430.35(A) | For a nonautomatically started motor, the overload protection shall be permitted to be shunted or cut out of the circuit during the starting period of the motor if the device by which the overload protection is shunted or cut out cannot be left in the starting position and if fuses or inverse time circuit breakers rate... | https://2023.antflix.net#430.35(A) |
Chapter 4 Equipment for General Use | 430.35(B) | The motor overload protection shall not be shunted or cut out during the starting period if the motor is automatically started. Exception: The motor overload protection shall be permitted to be shunted or cut out during the starting period on an automatically started motor where the following apply: (1) The motor start... | https://2023.antflix.net#430.35(B) |
Chapter 4 Equipment for General Use | 430.36 | Where fuses are used for motor overload protection, a fuse shall be inserted in each ungrounded conductor and also in the grounded conductor if the supply system is 3-wire, 3-phase ac with one conductor grounded. [430.36](https://2023.antflix.net#430.36) | https://2023.antflix.net#430.36 |
Chapter 4 Equipment for General Use | 430.37 | Where devices other than fuses are used for motor overload protection, Table 430.37 shall govern the minimum allowable number and location of overload units such as trip coils or relays. Table 430.37 Overload Units Kind of Motor Supply System Number and Location of Overload Units, Such as Trip Coils or Relays 1-... | https://2023.antflix.net#430.37 |
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