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Chapter 4 Equipment for General Use | 440.22(B) | The equipment branch-circuit short-circuit and ground-fault protective device shall be capable of carrying the starting current of the equipment. Where the hermetic refrigerant motor-compressor is the only load on the circuit, the protection shall comply with 440.22(A). Where the equipment incorporates more than one he... | https://2023.antflix.net#440.22(B) |
Chapter 4 Equipment for General Use | 440.22(B)(1) | Where a hermetic refrigerant motor-compressor is the largest load connected to the circuit, the rating or setting of the branch-circuit short-circuit and ground-fault protective device shall not exceed the value specified in 440.22(A) for the largest motor-compressor plus the sum of the rated-load current or branch-cir... | https://2023.antflix.net#440.22(B)(1) |
Chapter 4 Equipment for General Use | 440.22(B)(2) | Where a hermetic refrigerant motor-compressor is not the largest load connected to the circuit, the rating or setting of the branch-circuit short-circuit and ground-fault protective device shall not exceed a value equal to the sum of the rated-load current or branch-circuit selection current, whichever is greater, rati... | https://2023.antflix.net#440.22(B)(2) |
Chapter 4 Equipment for General Use | 440.22(C) | Where maximum protective device ratings shown on a manufacturer's overload relay table for use with a motor controller are less than the rating or setting selected in accordance with 440.22(A) and (B), the protective device rating shall not exceed the manufacturer's values marked on the equipment. [440.22(C)](https://2... | https://2023.antflix.net#440.22(C) |
Chapter 4 Equipment for General Use | 440.31 | Part IV and adjustments made in accordance with Part III of Article 310 specify ampacities of conductors required to carry the motor current without overheating under the conditions specified, except as modified in 440.6(A), Exception No. 1. These articles shall not apply to integral conductors of motors, to motor cont... | https://2023.antflix.net#440.31 |
Chapter 4 Equipment for General Use | 440.32 | Branch-circuit conductors supplying a single motor-compressor shall have an ampacity not less than the greater of the following: 125 percent of the motor-compressor rated-load current125 percent of the branch-circuit selection currentFor a wye-start, delta-run connected motor-compressor, the selection of branch-circuit... | https://2023.antflix.net#440.32 |
Chapter 4 Equipment for General Use | 440.33 | Conductors supplying one or more motor-compressor(s) with or without an additional motor load(s) shall have an ampacity not less than the sum of each of the following: The sum of the rated-load or branch-circuit selection current, whichever is greater, of all motor-compressor(s)The sum of the full-load current rating o... | https://2023.antflix.net#440.33 |
Chapter 4 Equipment for General Use | 440.34 | Conductors supplying a motor-compressor load(s) in addition to other load(s) shall have an ampacity sufficient for the other load(s) plus the required ampacity for the motor-compressor load(s).The motor compressor load(s) shall be determined in accordance with 440.32 or 440.33. The other load(s) shall be calculated fro... | https://2023.antflix.net#440.34 |
Chapter 4 Equipment for General Use | 440.35 | 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 440.4(B). [440.35](https://2023.antflix.net#440.35) | https://2023.antflix.net#440.35 |
Chapter 4 Equipment for General Use | 440.41(A) | A motor-compressor controller shall have both a continuous-duty full-load current rating and a locked-rotor current rating not less than the name-plate rated-load current or branch-circuit selection current, whichever is greater, and locked-rotor current, respectively, of the compressor. In case the motor controller is... | https://2023.antflix.net#440.41(A) |
Chapter 4 Equipment for General Use | 440.41(B) | A controller serving more than one motor-compressor or a motor-compressor and other loads shall have a continuous-duty full-load current rating and a locked-rotor current rating not less than the combined load as determined in accordance with 440.12(B). [440.41(B)](https://2023.antflix.net#440.41(B)) | https://2023.antflix.net#440.41(B) |
Chapter 4 Equipment for General Use | 440.51 | Part VI specifies devices intended to protect the motor-compressor, the motor-control apparatus, and the branch-circuit conductors against excessive heating due to motor overload and failure to start. Informational Note: See 240.4(G) for application of Parts III and VI of Article 440. [440.51](https://2023.antflix.net#... | https://2023.antflix.net#440.51 |
Chapter 4 Equipment for General Use | 440.52(A) | Each motor-compressor shall be protected against overload and failure to start by one of the following means: A separate overload relay that is responsive to motor-compressor current. This device shall be selected to trip at not more than 140 percent of the motor-compressor rated-load current.A thermal protector integr... | https://2023.antflix.net#440.52(A) |
Chapter 4 Equipment for General Use | 440.52(B) | The motor-compressor controller(s), the disconnecting means, and the branch-circuit conductors shall be protected against overcurrent due to motor overload and failure to start by one of the following means, which shall be permitted to be the same device or system protecting the motor-compressor in accordance with 440.... | https://2023.antflix.net#440.52(B) |
Chapter 4 Equipment for General Use | 440.53 | Overload relays and other devices for motor overload protection that are not capable of opening short circuits shall be protected by fuses or inverse time circuit breakers with ratings or settings in accordance with Part III unless identified for group installation or for part-winding motors and marked to indicate the ... | https://2023.antflix.net#440.53 |
Chapter 4 Equipment for General Use | 440.54 | Overload protection for motor-compressors and equipment used on 15- or 20-ampere 120-volt, or 15-ampere 208- or 240-volt, single-phase branch circuits shall be permitted in accordance with 440.54(A) and (B). [440.54](https://2023.antflix.net#440.54) | https://2023.antflix.net#440.54 |
Chapter 4 Equipment for General Use | 440.54(A) | The motor-compressor shall be provided with overload protection selected as specified in 440.52(A). Both the controller and motor overload protective device shall be identified for installation with the short-circuit and ground-fault protective device for the branch circuit to which the equipment is connected. [440.54(... | https://2023.antflix.net#440.54(A) |
Chapter 4 Equipment for General Use | 440.54(B) | The short-circuit and ground-fault protective device protecting the branch circuit shall have sufficient time delay to permit the motor-compressor and other motors to start and accelerate their loads. [440.54(B)](https://2023.antflix.net#440.54(B)) | https://2023.antflix.net#440.54(B) |
Chapter 4 Equipment for General Use | 440.55 | Overload protection for motor-compressors and equipment that are cord- and attachment-plug-connected and used on 15- or 20-ampere 120-volt, or 15-ampere 208- or 240-volt, single-phase branch circuits shall be permitted in accordance with 440.55(A), (B), and (C). [440.55](https://2023.antflix.net#440.55) | https://2023.antflix.net#440.55 |
Chapter 4 Equipment for General Use | 440.55(A) | The motor-compressor shall be provided with overload protection as specified in 440.52(A). Both the controller and the motor overload protective device shall be identified for installation with the short-circuit and ground-fault protective device for the branch circuit to which the equipment is connected. [440.55(A)](h... | https://2023.antflix.net#440.55(A) |
Chapter 4 Equipment for General Use | 440.55(B) | The rating of the attachment plug and receptacle or cord connector shall not exceed 20 amperes at 125 volts or 15 amperes at 250 volts. [440.55(B)](https://2023.antflix.net#440.55(B)) | https://2023.antflix.net#440.55(B) |
Chapter 4 Equipment for General Use | 440.55(C) | The short-circuit and ground-fault protective device protecting the branch circuit shall have sufficient time delay to permit the motor-compressor and other motors to start and accelerate their loads. [440.55(C)](https://2023.antflix.net#440.55(C)) | https://2023.antflix.net#440.55(C) |
Chapter 4 Equipment for General Use | 440.60 | Part VII shall apply to electrically energized room air conditioners that control temperature and humidity. For the purpose of Part VII, a room air conditioner (with or without provisions for heating) shall be considered as an ac appliance of the air-cooled window, console, or in-wall type that is installed in the cond... | https://2023.antflix.net#440.60 |
Chapter 4 Equipment for General Use | 440.61 | The enclosures of room air conditioners shall be connected to the equipment grounding conductor in accordance with 250.110, 250.112, and 250.114. [440.61](https://2023.antflix.net#440.61) | https://2023.antflix.net#440.61 |
Chapter 4 Equipment for General Use | 440.62(A) | A room air conditioner shall be considered as a single motor unit in determining its branch-circuit requirements where all the following conditions are met: It is cord- and attachment-plug-connected.Its rating is not more than 40 amperes and 250 volts, single phase.Total rated-load current is shown on the room aircondi... | https://2023.antflix.net#440.62(A) |
Chapter 4 Equipment for General Use | 440.62(B) | The total marked current rating of a cord- and attachment-plug-connected room air conditioner shall not exceed 80 percent of the current rating of a branch circuit where no other loads are supplied. [440.62(B)](https://2023.antflix.net#440.62(B)) | https://2023.antflix.net#440.62(B) |
Chapter 4 Equipment for General Use | 440.62(C) | The total marked current rating of a cord- and attachment-plug-connected room air conditioner shall not exceed 50 percent of the current rating of a branch circuit where lighting outlets, other appliances, or general-use receptacles are also supplied. Where the circuitry is interlocked to prevent simultaneous operation... | https://2023.antflix.net#440.62(C) |
Chapter 4 Equipment for General Use | 440.63 | An attachment plug and receptacle or cord connector shall be permitted to serve as the disconnecting means for a single-phase room air conditioner rated 250 volts or less if (1) the manual controls on the room air conditioner are readily accessible and located within 1.8 m (6 ft) of the floor, or (2) an approved manual... | https://2023.antflix.net#440.63 |
Chapter 4 Equipment for General Use | 440.64 | Where a flexible cord is used to supply a room air conditioner, the length of such cord shall not exceed 3.0 m (10 ft) for a nominal, 120-volt rating or 1.8 m (6 ft) for a nominal, 208- or 240-volt rating. [440.64](https://2023.antflix.net#440.64) | https://2023.antflix.net#440.64 |
Chapter 4 Equipment for General Use | 440.65 | Single-phase cord- and plug-connected room air conditioners shall be provided with one of the following factory-installed devices: Leakage-current detector-interrupter (LCDI)Arc-fault circuit interrupter (AFCI)Heat detecting circuit interrupter (HDCI)The protection device shall be an integral part of the attachment plu... | https://2023.antflix.net#440.65 |
Chapter 4 Equipment for General Use | 445.1 | This article contains installation and other requirements for generators. [445.1](https://2023.antflix.net#445.1) | https://2023.antflix.net#445.1 |
Chapter 4 Equipment for General Use | 445.6 | Stationary generators shall be listed. Exception: One of a kind or custom manufactured generators shall be permitted to be field labeled. Informational Note: See UL 2200, Standard for Stationary Engine Generator Assemblies, for additional information. [445.6](https://2023.antflix.net#445.6) | https://2023.antflix.net#445.6 |
Chapter 4 Equipment for General Use | 445.10 | Generators shall be of a type suitable for the locations in which they are installed. They shall also meet the requirements for motors in 430.14. Informational Note: See NFPA 37-2021, Standard for the Installation and Use of Stationary Combustion Engines and Gas Turbines, for information on the location of generators. ... | https://2023.antflix.net#445.10 |
Chapter 4 Equipment for General Use | 445.11 | Each generator shall be provided with an accessible nameplate giving the manufacturer's name, the rated frequency, the number of phases if ac, the rating in kilowatts or kilovolt-amperes, the power factor, the normal volts and amperes corresponding to the rating, and the rated ambient temperature. Nameplates or manufac... | https://2023.antflix.net#445.11 |
Chapter 4 Equipment for General Use | 445.12(A) | Constant-voltage generators, except ac generator exciters, shall be protected from overload by inherent design, circuit breakers, fuses, protective relays, or other identified overcurrent protective means suitable for the conditions of use. [445.12(A)](https://2023.antflix.net#445.12(A)) | https://2023.antflix.net#445.12(A) |
Chapter 4 Equipment for General Use | 445.12(B) | Two-wire, dc generators shall be permitted to have overcurrent protection in one conductor only if the overcurrent device is actuated by the entire current generated other than the current in the shunt field. The over-current device shall not open the shunt field. [445.12(B)](https://2023.antflix.net#445.12(B)) | https://2023.antflix.net#445.12(B) |
Chapter 4 Equipment for General Use | 445.12(C) | Generators operating at 65 volts or less and driven by individual motors shall be considered as protected by the overcurrent device protecting the motor if these devices will operate when the generators are delivering not more than 150 percent of their full-load rated current. [445.12(C)](https://2023.antflix.net#445.1... | https://2023.antflix.net#445.12(C) |
Chapter 4 Equipment for General Use | 445.12(D) | Two-wire, dc generators used in conjunction with balancer sets to obtain neutral points for 3-wire systems shall be equipped with overcurrent devices that disconnect the 3-wire system in case of excessive unbalancing of voltages or currents. [445.12(D)](https://2023.antflix.net#445.12(D)) | https://2023.antflix.net#445.12(D) |
Chapter 4 Equipment for General Use | 445.12(E) | Three-wire, dc generators, whether compound or shunt wound, shall be equipped with overcurrent devices, one in each armature lead, and connected so as to be actuated by the entire current from the armature. Such overcurrent devices shall consist either of a double-pole, double-coil circuit breaker or of a 4-pole circui... | https://2023.antflix.net#445.12(E) |
Chapter 4 Equipment for General Use | 445.13(A) | The ampacity of the conductors from the generator output terminals to the first distribution device(s) containing overcurrent protection shall not be less than 115 percent of the nameplate current rating of the generator. It shall be permitted to size the neutral conductors in accordance with 220.61. Conductors that mu... | https://2023.antflix.net#445.13(A) |
Chapter 4 Equipment for General Use | 445.13(B) | Where the generator set is equipped with a listed overcurrent protective device or a combination of a current transformer and overcurrent relay, conductors shall be permitted to be tapped from the load side of the protected terminals in accordance with 240.21 (B). Tapped conductors shall not be permitted for portable g... | https://2023.antflix.net#445.13(B) |
Chapter 4 Equipment for General Use | 445.14 | Live parts of generators operated at more than 50 volts ac or 60 volts dc to ground shall not be exposed to accidental contact where accessible to unqualified persons. [445.14](https://2023.antflix.net#445.14) | https://2023.antflix.net#445.14 |
Chapter 4 Equipment for General Use | 445.15 | Where necessary for the safety of attendants, the requirements of 430.233 shall apply. [445.15](https://2023.antflix.net#445.15) | https://2023.antflix.net#445.15 |
Chapter 4 Equipment for General Use | 445.16 | Where field-installed wiring passes through an opening in an enclosure, a conduit box, or a barrier, a bushing shall be used to protect the conductors from the edges of an opening having sharp edges. The bushing shall have smooth, well-rounded surfaces where it may be in contact with the conductors. If used where oils,... | https://2023.antflix.net#445.16 |
Chapter 4 Equipment for General Use | 445.17 | Generator terminal housings shall comply with 430.12. Where a horsepower rating is required to determine the required minimum size of the generator terminal housing, the full-load current of the generator shall be compared with comparable motors in Table 430.247 through Table 430.250. The higher horsepower rating of Ta... | https://2023.antflix.net#445.17 |
Chapter 4 Equipment for General Use | 445.18(A) | Generators other than cord-and-plug-connected portable generators shall have one or more disconnecting means. Each disconnecting means shall simultaneously open all associated ungrounded conductors. Each disconnecting means shall be lockable open in accordance with 110.25. The disconnecting means shall be permitted to ... | https://2023.antflix.net#445.18(A) |
Chapter 4 Equipment for General Use | 445.18(B) | Where a generator is installed in parallel with other generators, the provisions of 445.18(A) shall be capable of isolating the generator output terminals from the paralleling system bus. The disconnecting means shall not be required to be located at the generator. [445.18(B)](https://2023.antflix.net#445.18(B)) | https://2023.antflix.net#445.18(B) |
Chapter 4 Equipment for General Use | 445.19(A) | Generators shall have provisions to shut down the prime mover. The means of shutdown shall comply with all of the following: Be equipped with provisions to disable all prime mover start control circuits to render the prime mover incapable of startingInitiate a shutdown mechanism that requires a mechanical resetThe prov... | https://2023.antflix.net#445.19(A) |
Chapter 4 Equipment for General Use | 445.19(B) | For other than one- and two-family dwelling units, generators with greater than 15 kW rating shall be provided with a remote emergency stop switch to shut down the prime mover. The remote emergency stop switch shall be located outside the equipment room or generator enclosure at a readily accessible location and shall ... | https://2023.antflix.net#445.19(B) |
Chapter 4 Equipment for General Use | 445.19(C) | For other than cord-and-plug-connected portable generators, an emergency shutdown device shall be located outside the dwelling unit at a readily accessible location and shall also meet the requirements of 445.19(A)(1) and (A)(2). An emergency shutdown device mounted on the exterior of the generator enclosure shall be p... | https://2023.antflix.net#445.19(C) |
Chapter 4 Equipment for General Use | 445.20 | Receptacle outlets that are a part of a 15-kW or smaller portable generator shall have listed ground-fault circuit-interrupter protection (GFCI) for personnel integral to the generator or receptacle as indicated in either 445.20(A) or (B): [445.20](https://2023.antflix.net#445.20) | https://2023.antflix.net#445.20 |
Chapter 4 Equipment for General Use | 445.20(A) | Unbonded generators with both 125-volt and 125/250-volt receptacle outlets shall have listed GFCI protection for personnel integral to the generator or receptacle on all 125-volt, 15- and 20-ampere receptacle outlets. Exception: GFCI protection shall not be required where the 125-volt receptacle outlets(s) is interlock... | https://2023.antflix.net#445.20(A) |
Chapter 4 Equipment for General Use | 445.20(B) | Bonded generators shall be provided with GFCI protection on all 125-volt. 15- and 20-ampere receptacle outlets. Informational Note: See 590.6(A)(3) for GFCI requirements for 15-kW or smaller portable generators used for temporary electric power and lighting. Exception to (A) and (B): If the generator was manufactured o... | https://2023.antflix.net#445.20(B) |
Chapter 4 Equipment for General Use | 450.1 | This article covers the installation of all transformers other than the following: Current transformersDry-type transformers that constitute a component part of other apparatus and comply with the requirements for such apparatusTransformers that are an integral part of an X-ray, high-frequency, or electrostatic-coating... | https://2023.antflix.net#450.1 |
Chapter 4 Equipment for General Use | 450.2 | Transformers shall individually comply with the requirements of this article unless specific provisions allow for interconnection and operation as a single unit. [450.2](https://2023.antflix.net#450.2) | https://2023.antflix.net#450.2 |
Chapter 4 Equipment for General Use | 450.3 | Overcurrent protection of transformers shall comply with 450.3(A), (B), or (C). As used in this section, the word transformer shall mean a transformer or polyphase bank of two or more single-phase transformers operating as a unit. Informational Note No. 1: See 240.4, 240.21, 245.26, and 245.27 for overcurrent protectio... | https://2023.antflix.net#450.3 |
Chapter 4 Equipment for General Use | 450.3(A) | Overcurrent protection shall be provided in accordance with Table 450.3(A).Table 450.3(A) Maximum Rating or Setting of Overcurrent Protection for Transformers Over 1000 Volts (as a Percentage of Transformer-Rated Current)
Location Limitations
Transformer Rated Impedance
Primary Protection over 1000 Volts
Secondary P... | https://2023.antflix.net#450.3(A) |
Chapter 4 Equipment for General Use | 450.3(B) | Overcurrent protection shall be provided in accordance with Table 450.3(B) unless the transformer is installed as a motor control circuit transformer in accordance with 430.72(C)(1) through (C)(5).Table 450.3(B) Maximum Rating or Setting of Overcurrent Protection for Transformers 1000 Volts and Less (as a Percentage of... | https://2023.antflix.net#450.3(B) |
Chapter 4 Equipment for General Use | 450.3(C) | Voltage (potential) transformers installed indoors or enclosed shall be protected with primary fuses.
Informational Note: See 408.52 for protection of instrument circuits, including voltage transformers. [450.3(C)](https://2023.antflix.net#450.3(C)) | https://2023.antflix.net#450.3(C) |
Chapter 4 Equipment for General Use | 450.4(A) | Each autotransformer 1000 volts, nominal, or less shall be protected by an individual overcurrent device installed in series with each ungrounded input conductor. Such overcurrent device shall be rated or set at not more than 125 percent of the rated full-load input current of the autotransformer. Where this calculatio... | https://2023.antflix.net#450.4(A) |
Chapter 4 Equipment for General Use | 450.4(B) | A transformer field-connected as an autotransformer shall be identified for use at elevated voltage. Informational Note: See 210.9 and 215.11 for information on permitted uses of autotransformers. [450.4(B)](https://2023.antflix.net#450.4(B)) | https://2023.antflix.net#450.4(B) |
Chapter 4 Equipment for General Use | 450.5 | Grounding autotransformers covered in this section are zigzag or T-connected transformers connected to 3-phase, 3-wire ungrounded systems for the purpose of creating a 3-phase, 4-wire distribution system or providing a neutral point for grounding purposes. Such transformers shall have a continuous per-phase current rat... | https://2023.antflix.net#450.5 |
Chapter 4 Equipment for General Use | 450.5(A) | A grounding autotransformer used to create a 3-phase, 4-wire distribution system from a 3-phase, 3-wire ungrounded system shall conform to 450.5(A)(1) through (A)(4). [450.5(A)](https://2023.antflix.net#450.5(A)) | https://2023.antflix.net#450.5(A) |
Chapter 4 Equipment for General Use | 450.5(A)(1) | The transformer shall be directly connected to the ungrounded phase conductors and shall not be switched or provided with overcurrent protection that is independent of the main switch and common-trip overcurrent protection for the 3-phase, 4-wire system. [450.5(A)(1)](https://2023.antflix.net#450.5(A)(1)) | https://2023.antflix.net#450.5(A)(1) |
Chapter 4 Equipment for General Use | 450.5(A)(2) | An overcurrent sensing device shall be provided that will cause the main switch or common-trip overcurrent protection referred to in 450.5(A)(1) to open if the load on the autotransformer reaches or exceeds 125 percent of its continuous current per-phase or neutral rating. Delayed tripping for temporary overcurrents se... | https://2023.antflix.net#450.5(A)(2) |
Chapter 4 Equipment for General Use | 450.5(A)(3) | A fault-sensing system that causes the opening of a main switch or common-trip overcurrent device for the 3-phase, 4-wire system shall be provided to guard against single-phasing or internal faults. Informational Note: This can be accomplished by the use of two subtractive-connected donut-type current transformers inst... | https://2023.antflix.net#450.5(A)(3) |
Chapter 4 Equipment for General Use | 450.5(A)(4) | The autotransformer shall have a continuous neutral-current rating that is not less than the maximum possible neutral unbalanced load current of the 4-wire system. [450.5(A)(4)](https://2023.antflix.net#450.5(A)(4)) | https://2023.antflix.net#450.5(A)(4) |
Chapter 4 Equipment for General Use | 450.5(B) | A grounding autotransformer used to make available a specified magnitude of ground-fault current for operation of a ground-responsive protective device on a 3-phase, 3-wire ungrounded system shall conform to 450.5(B)(1) and (B)(2). [450.5(B)](https://2023.antflix.net#450.5(B)) | https://2023.antflix.net#450.5(B) |
Chapter 4 Equipment for General Use | 450.5(B)(1) | The autotransformer shall have a continuous neutral-current rating not less than the specified ground-fault current. [450.5(B)(1)](https://2023.antflix.net#450.5(B)(1)) | https://2023.antflix.net#450.5(B)(1) |
Chapter 4 Equipment for General Use | 450.5(B)(2) | Overcurrent protection shall comply with 450.5(B)(2) (a) and (B)(2) (b). Operation and Interrupting Rating. An overcurrent protective device having an interrupting rating in compliance with 110.9 and that will open simultaneously all ungrounded conductors when it operates shall be applied in the grounding autotransform... | https://2023.antflix.net#450.5(B)(2) |
Chapter 4 Equipment for General Use | 450.5(C) | A grounding autotransformer used to limit transitory overvoltages shall be of suitable rating and connected in accordance with 450.5(A)(1). [450.5(C)](https://2023.antflix.net#450.5(C)) | https://2023.antflix.net#450.5(C) |
Chapter 4 Equipment for General Use | 450.6 | As used in this article, a secondary tie is a circuit operating at 1000 volts, nominal, or less between phases that connects two power sources or power supply points, such as the secondaries of two transformers. The tie shall be permitted to consist of one or more conductors per phase or neutral. Conductors connecting ... | https://2023.antflix.net#450.6 |
Chapter 4 Equipment for General Use | 450.6(A) | Tie circuits shall be provided with overcurrent protection at each end as required in Parts I, II, and VIII of Article 240. Under the conditions described in 450.6(A)(1) and 450.6(A)(2), the overcurrent protection shall be permitted to be in accordance with 450.6(A)(3). [450.6(A)](https://2023.antflix.net#450.6(A)) | https://2023.antflix.net#450.6(A) |
Chapter 4 Equipment for General Use | 450.6(A)(1) | Where all loads are connected at the transformer supply points at each end of the tie and overcurrent protection is not provided in accordance with Parts I, II, and VIII of Article 240, the ampacity of the tie shall not be less than 67 percent of the rated secondary current of the highest rated transformer supplying th... | https://2023.antflix.net#450.6(A)(1) |
Chapter 4 Equipment for General Use | 450.6(A)(2) | Where load is connected to the tie at any point between transformer supply points and overcurrent protection is not provided in accordance with Parts I, II, and VIII of Article 240, the ampacity of the tie shall not be less than 100 percent of the rated secondary current of the highest rated transformer supplying the s... | https://2023.antflix.net#450.6(A)(2) |
Chapter 4 Equipment for General Use | 450.6(A)(3) | Under the conditions described in 450.6(A)(1) and (A)(2), both supply ends of each ungrounded tie conductor shall be equipped with a protective device that opens at a predetermined temperature of the tie conductor under short-circuit conditions. This protection shall consist of one of the following: (1) a fusible link ... | https://2023.antflix.net#450.6(A)(3) |
Chapter 4 Equipment for General Use | 450.6(A)(4) | Where the tie consists of more than one conductor per phase or neutral, the conductors of each phase or neutral shall comply with 450.6(A)(4) (a) or (A)(4) (b). Interconnected. The conductors shall be interconnected in order to establish a load supply point, and the protective device specified in 450.6(A)(3) shall be p... | https://2023.antflix.net#450.6(A)(4) |
Chapter 4 Equipment for General Use | 450.6(A)(5) | Where the operating voltage exceeds 150 volts to ground, secondary ties provided with limiters shall have a switch at each end that, when open, de-energizes the associated tie conductors and limiters. The current rating of the switch shall not be less than the rated current ampacity of the conductors connected to the s... | https://2023.antflix.net#450.6(A)(5) |
Chapter 4 Equipment for General Use | 450.6(B) | Where secondary ties are used, an overcurrent device rated or set at not more than 250 percent of the rated secondary current of the transformers shall be provided in the secondary connections of each transformer supplying the tie system. In addition, an automatic circuit breaker actuated by a reverse-current relay set... | https://2023.antflix.net#450.6(B) |
Chapter 4 Equipment for General Use | 450.6(C) | Where the secondary tie system is grounded, each transformer secondary supplying the tie system shall be grounded in accordance with 250.30 for separately derived systems. [450.6(C)](https://2023.antflix.net#450.6(C)) | https://2023.antflix.net#450.6(C) |
Chapter 4 Equipment for General Use | 450.7 | Transformers shall be permitted to be operated in parallel and switched as a unit, provided the overcurrent protection for each transformer meets the requirements of 450.3(A) for primary and secondary protective devices over 1000 volts, or 450.3(B) for primary and secondary protective devices 1000 volts or less. [450.7... | https://2023.antflix.net#450.7 |
Chapter 4 Equipment for General Use | 450.8 | Transformers shall be guarded as specified in 450.8(A) through (D). [450.8](https://2023.antflix.net#450.8) | https://2023.antflix.net#450.8 |
Chapter 4 Equipment for General Use | 450.8(A) | Appropriate provisions shall be made to minimize the possibility of damage to transformers from external causes where the transformers are exposed to physical damage. [450.8(A)](https://2023.antflix.net#450.8(A)) | https://2023.antflix.net#450.8(A) |
Chapter 4 Equipment for General Use | 450.8(B) | Dry-type transformers shall be provided with a noncombustible moisture-resistant case or enclosure that provides protection against the accidental insertion of foreign objects. [450.8(B)](https://2023.antflix.net#450.8(B)) | https://2023.antflix.net#450.8(B) |
Chapter 4 Equipment for General Use | 450.8(C) | Switches or other equipment operating at 1000 volts, nominal, or less and serving only equipment within a transformer enclosure shall be permitted to be installed in the transformer enclosure if accessible to qualified persons only. All energized parts shall be guarded in accordance with 110.27 and 110.34. [450.8(C)](h... | https://2023.antflix.net#450.8(C) |
Chapter 4 Equipment for General Use | 450.8(D) | The operating voltage of exposed live parts of transformer installations shall be indicated by signs or visible markings on the equipment or structures. [450.8(D)](https://2023.antflix.net#450.8(D)) | https://2023.antflix.net#450.8(D) |
Chapter 4 Equipment for General Use | 450.9 | The ventilation shall dispose of the transformer full-load heat losses without creating a temperature rise that is in excess of the transformer rating. Informational Note No. 1: See IEEE C57.12.00-2015, General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers, and IEEE C57.12.01-2020, G... | https://2023.antflix.net#450.9 |
Chapter 4 Equipment for General Use | 450.10(A) | Where separate equipment grounding conductors and supply-side bonding jumpers are installed, a terminal bar for all grounding and bonding conductor connections shall be secured inside the transformer enclosure. The terminal bar shall be bonded to the enclosure in accordance with 250.12 and shall not be installed on or ... | https://2023.antflix.net#450.10(A) |
Chapter 4 Equipment for General Use | 450.10(B) | Exposed non-current-carrying metal parts of transformer installations, including fences, guards, and so forth, shall be grounded and bonded under the conditions and in the manner specified for electrical equipment and other exposed metal parts in Parts V, VI, and VII of Article 250. [450.10(B)](https://2023.antflix.net... | https://2023.antflix.net#450.10(B) |
Chapter 4 Equipment for General Use | 450.11(A) | Each transformer shall be provided with a name-plate giving the following information: Name of manufacturerRated kilovolt-amperesFrequencyPrimary and secondary voltageImpedance of transformers 25 kVA and largerRequired clearances for transformers with ventilating openingsAmount and kind of insulating liquid where usedF... | https://2023.antflix.net#450.11(A) |
Chapter 4 Equipment for General Use | 450.11(B) | A transformer shall be permitted to be supplied at the marked secondary voltage, provided that the installation is in accordance with the manufacturer's instructions. [450.11(B)](https://2023.antflix.net#450.11(B)) | https://2023.antflix.net#450.11(B) |
Chapter 4 Equipment for General Use | 450.12 | The minimum wire-bending space at fixed, 1000-volt and below terminals of transformer line and load connections shall be as required in 312.6. Wiring space for pigtail connections shall conform to Table 314.16(B)(1). [450.12](https://2023.antflix.net#450.12) | https://2023.antflix.net#450.12 |
Chapter 4 Equipment for General Use | 450.13 | All transformers and transformer vaults shall be readily accessible to qualified personnel for inspection and maintenance or shall meet the requirements of 450.13(A) or 450.13(B). [450.13](https://2023.antflix.net#450.13) | https://2023.antflix.net#450.13 |
Chapter 4 Equipment for General Use | 450.13(A) | Dry-type transformers 1000 volts, nominal, or less, located in the open on walls, columns, or structures, shall not be required to be readily accessible. [450.13(A)](https://2023.antflix.net#450.13(A)) | https://2023.antflix.net#450.13(A) |
Chapter 4 Equipment for General Use | 450.13(B) | Dry-type transformers 1000 volts, nominal, or less and not exceeding 50 kVA shall be permitted in hollow spaces of buildings not permanently closed in by structure, provided they meet the ventilation requirements of 450.9 and separation from combustible materials requirements of 450.21(A). Transformers so installed sha... | https://2023.antflix.net#450.13(B) |
Chapter 4 Equipment for General Use | 450.14 | Transformers, other than Class 2 or Class 3 transformers, shall have a disconnecting means located either in sight of the transformer or in a remote location. Where located in a remote location, the disconnecting means shall be lockable open in accordance with 110.25, and its location shall be field marked on the trans... | https://2023.antflix.net#450.14 |
Chapter 4 Equipment for General Use | 450.21(A) | Dry-type transformers installed indoors and rated 1121/2 kVA or less shall have a separation of at least 300 mm (12 in.) from combustible material unless separated from the combustible material by a fire-resistant, heat-insulated barrier. Exception: This rule shall not apply to transformers rated for 1000 volts, nomina... | https://2023.antflix.net#450.21(A) |
Chapter 4 Equipment for General Use | 450.21(B) | Individual dry-type transformers of more than 1121/2 kVA rating shall be installed in a transformer room of fire-resistant construction having a minimum fire rating of 1 hour. Exception No. 1: Transformers with Class 155 or higher insulation systems and separated from combustible material by a fire-resistant, heat-insu... | https://2023.antflix.net#450.21(B) |
Chapter 4 Equipment for General Use | 450.21(C) | Dry-type transformers rated over 35,000 volts shall be installed in a vault complying with Part III of this article. [450.21(C)](https://2023.antflix.net#450.21(C)) | https://2023.antflix.net#450.21(C) |
Chapter 4 Equipment for General Use | 450.22 | Dry-type transformers installed outdoors shall have a weatherproof enclosure. Transformers exceeding 1121/2 kVA shall not be located within 300 mm (12 in.) of combustible materials of buildings unless the transformer has Class 155 insulation systems or higher and is completely enclosed except for ventilating openings. ... | https://2023.antflix.net#450.22 |
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