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Chapter 2 Wiring and Protection | 235.356(A)(7) | All relays and metering that use phase differences for operation shall be verified by measuring phase angles at the relay under actual load conditions after operation commences. [235.356(A)(7)](https://2023.antflix.net#235.356(A)(7)) | https://2023.antflix.net#235.356(A)(7) |
Chapter 2 Wiring and Protection | 235.356(B) | A test report covering the results of the tests required in 235.356(A) shall be delivered to the authority having jurisdiction prior to energization. Informational Note: See ANSI/NETA ATS, Acceptance Testing Specifications for Electrical Power Distribution Equipment and Systems, for an example of acceptance specificati... | https://2023.antflix.net#235.356(B) |
Chapter 2 Wiring and Protection | 235.360(A) | The clearances over roadways, walkways, rail, water, and open land for conductors and live parts up to 22 kV or less to ground shall be not less than the values shown in Table 235.360(A).Table 235.360(A) Clearances over Roadways, Walkways, Rail, Water, and Open Land Location Clearance m ft Open land subject to... | https://2023.antflix.net#235.360(A) |
Chapter 2 Wiring and Protection | 235.360(B) | Clearances for the categories shown in Table 235.360(A) shall be increased by 10 mm (0.4 in.) per kV, or major fraction thereof, more than 22 kV. [235.360(B)](https://2023.antflix.net#235.360(B)) | https://2023.antflix.net#235.360(B) |
Chapter 2 Wiring and Protection | 235.360(C) | For special cases, such as where crossings will be made over lakes, rivers, or areas using large vehicles such as mining operations, specific designs shall be engineered considering the special circumstances and shall be approved by the authority having jurisdiction. Informational Note: See ANSI/IEEE C2-2017, National ... | https://2023.antflix.net#235.360(C) |
Chapter 2 Wiring and Protection | 235.361(A) | The clearances over buildings and other structures for conductors and live parts up to 22 kV or less to ground shall be not less than the values shown in Table 235.361 (A).Table 235.361(A) Clearances over Buildings and Other Structures Clearance from Conductors or Live Parts from: Horizontal Vertical m ft m ft ... | https://2023.antflix.net#235.361(A) |
Chapter 2 Wiring and Protection | 235.361(B) | Clearances for the categories shown in Table 235.361(A) shall be increased by 10 mm (0.4 in.) per kV, or major fraction thereof, more than 22 kV. Informational Note: See ANSI/IEEE C2-2017, National Electrical Safety Code, for additional information. [235.361(B)](https://2023.antflix.net#235.361(B)) | https://2023.antflix.net#235.361(B) |
Chapter 2 Wiring and Protection | 235.401 | Part V covers requirements for service conductors and equipment used on circuits over 1000 volts ac and 1500 volts dc, nominal, shall comply with all of the applicable requirements in Parts I through VII of Article 230 and with Part V of this article, which supplements or modifies those requirements. In no case shall t... | https://2023.antflix.net#235.401 |
Chapter 2 Wiring and Protection | 235.402 | Service-entrance conductors to buildings or enclosures shall be installed to conform to 235.402(A) and (B). [235.402](https://2023.antflix.net#235.402) | https://2023.antflix.net#235.402 |
Chapter 2 Wiring and Protection | 235.402(A) | Service-entrance conductors shall not be smaller than 6 AWG unless in multiconductor cable. Multiconductor cable shall not be smaller than 8 AWG. [235.402(A)](https://2023.antflix.net#235.402(A)) | https://2023.antflix.net#235.402(A) |
Chapter 2 Wiring and Protection | 235.402(B) | Service-entrance conductors shall be installed by one of the wiring methods covered in 305.3 and 305.15. [235.402(B)](https://2023.antflix.net#235.402(B)) | https://2023.antflix.net#235.402(B) |
Chapter 2 Wiring and Protection | 235.404(A) | Where oil switches or air, oil, vacuum, or sulfur hexafluoride circuit breakers constitute the service disconnecting means, an isolating switch with visible break contacts shall be installed on the supply side of the disconnecting means and all associated service equipment. Exception: An isolating switch shall not be r... | https://2023.antflix.net#235.404(A) |
Chapter 2 Wiring and Protection | 235.404(B) | Where fuses are of the type that can be operated as a disconnecting switch, a set of such fuses shall be permitted as the isolating switch. [235.404(B)](https://2023.antflix.net#235.404(B)) | https://2023.antflix.net#235.404(B) |
Chapter 2 Wiring and Protection | 235.404(C) | The isolating switch shall be accessible to qualified persons only. [235.404(C)](https://2023.antflix.net#235.404(C)) | https://2023.antflix.net#235.404(C) |
Chapter 2 Wiring and Protection | 235.404(D) | Isolating switches shall be provided with a means for readily connecting the load side conductors to a grounding electrode system, equipment ground busbar, or grounded steel structure when disconnected from the source of supply. A means for grounding the load side conductors to a grounding electrode system, equipment g... | https://2023.antflix.net#235.404(D) |
Chapter 2 Wiring and Protection | 235.405(A) | The service disconnecting means shall be located in accordance with 230.70. For either overhead or underground primary distribution systems on private property, the service disconnect shall be permitted to be located in a location that is not readily accessible, if the disconnecting means can be operated by mechanical ... | https://2023.antflix.net#235.405(A) |
Chapter 2 Wiring and Protection | 235.405(B) | Each service disconnect shall simultaneously disconnect all ungrounded service conductors that it controls and shall have a fault-closing rating that is not less than the available fault current at its supply terminals. Where fused switches or separately mounted fuses are installed, the fuse characteristics shall be pe... | https://2023.antflix.net#235.405(B) |
Chapter 2 Wiring and Protection | 235.405(C) | For multibuilding, industrial installations under single management, the service disconnecting means shall be permitted to be located at a separate building or structure. In such cases, the service disconnecting means shall be permitted to be electrically operated by a readily accessible, remote-control device. [235.40... | https://2023.antflix.net#235.405(C) |
Chapter 2 Wiring and Protection | 235.406 | Where the circuit breaker or alternative for it, as specified in 235.408 for service overcurrent devices, meets the requirements specified in 235.405, it shall constitute the service disconnecting means. [235.406](https://2023.antflix.net#235.406) | https://2023.antflix.net#235.406 |
Chapter 2 Wiring and Protection | 235.408 | A short-circuit protective device shall be provided on the load side of, or as an integral part of, the service disconnect, and shall protect all ungrounded conductors that it supplies. The protective device shall be capable of detecting and interrupting all values of current, in excess of its trip setting or melting p... | https://2023.antflix.net#235.408 |
Chapter 2 Wiring and Protection | 235.408(A) | Equipment used to protect service-entrance conductors shall meet the requirements of Article 495, Part II. [235.408(A)](https://2023.antflix.net#235.408(A)) | https://2023.antflix.net#235.408(A) |
Chapter 2 Wiring and Protection | 235.408(B) | The restriction to 80 percent of the rating for an enclosed overcurrent device for continuous loads shall not apply to overcurrent devices installed in systems operating at over 1000 volts. [235.408(B)](https://2023.antflix.net#235.408(B)) | https://2023.antflix.net#235.408(B) |
Chapter 2 Wiring and Protection | 235.409 | Surge arresters installed in accordance with the requirements of Parts II and III of Article 242 shall be permitted on each ungrounded overhead service conductor. Informational Note: Surge arresters may be referred to as lightning arresters in older documents. [235.409](https://2023.antflix.net#235.409) | https://2023.antflix.net#235.409 |
Chapter 2 Wiring and Protection | 235.410 | Service equipment, including instrument transformers, shall conform to Part I of Article 495. [235.410](https://2023.antflix.net#235.410) | https://2023.antflix.net#235.410 |
Chapter 2 Wiring and Protection | 235.411 | Switchgear shall consist of a substantial metal structure and a sheet metal enclosure. Where installed over a combustible floor, suitable protection thereto shall be provided. [235.411](https://2023.antflix.net#235.411) | https://2023.antflix.net#235.411 |
Chapter 2 Wiring and Protection | 235.412 | Where the voltage exceeds 35,000 volts between conductors that enter a building, they shall terminate in a switchgear compartment or a vault conforming to the requirements of 450.41 through 450.48. [235.412](https://2023.antflix.net#235.412) | https://2023.antflix.net#235.412 |
Chapter 2 Wiring and Protection | 240.1 | Parts I through VII of this article provide the general requirements for overcurrent protection and overcurrent protective devices not more than 1000 volts, nominal. Part VIII covers overcurrent protection for those portions of supervised industrial installations operating at voltages of not more than 1000 volts, nomin... | https://2023.antflix.net#240.1 |
Chapter 2 Wiring and Protection | 240.2(A) | The following equipment shall not be reconditioned: Equipment providing ground-fault protection of equipmentGround-fault circuit interruptersLow-voltage fuseholders and low-voltage nonrenewable fusesMolded-case circuit breakersLow-voltage power circuit breaker electronic trip units. [240.2(A)](https://2023.antflix.net#... | https://2023.antflix.net#240.2(A) |
Chapter 2 Wiring and Protection | 240.2(B) | The following equipment shall be permitted to be reconditioned: Low-voltage power circuit breakersElectromechanical protective relays and current transformersReconditioned equipment shall be listed as reconditioned and comply with 110.21(A)(2). [240.2(B)](https://2023.antflix.net#240.2(B)) | https://2023.antflix.net#240.2(B) |
Chapter 2 Wiring and Protection | 240.3 | Equipment shall be protected against overcurrent in accordance with the article in this Code that covers the type of equipment specified in Table 240.3. Table 240.3 Other Articles Equipment Article Air-conditioning and refrigerating equipment 440 Appliances 422 Assembly occupancies 518 Audio signal process... | https://2023.antflix.net#240.3 |
Chapter 2 Wiring and Protection | 240.4 | Conductors, other than flexible cords, flexible cables, and fixture wires, shall be protected against overcurrent in accordance with their ampacities specified in 310.14, unless otherwise permitted or required in 240.4(A) through (H). Informational Note: See ICEA P-32-382-2018, Short Circuit Characteristics of Insulate... | https://2023.antflix.net#240.4 |
Chapter 2 Wiring and Protection | 240.4(A) | Conductor overload protection shall not be required where the interruption of the circuit would create a hazard, such as in a material-handling magnet circuit or fire pump circuit. Short-circuit protection shall be provided. Informational Note: See NFPA 20-2019, Standard for the Installation of Stationary Pumps for Fir... | https://2023.antflix.net#240.4(A) |
Chapter 2 Wiring and Protection | 240.4(B) | The next higher standard overcurrent device rating (above the ampacity of the conductors being protected) shall be permitted to be used, provided all of the following conditions are met: The conductors being protected are not part of a branch circuit supplying more than one receptacle for cord-and-plug-connected portab... | https://2023.antflix.net#240.4(B) |
Chapter 2 Wiring and Protection | 240.4(C) | Where the overcurrent device is rated over 800 amperes, the ampacity of the conductors it protects shall be equal to or greater than the rating of the overcurrent device defined in 240.6. [240.4(C)](https://2023.antflix.net#240.4(C)) | https://2023.antflix.net#240.4(C) |
Chapter 2 Wiring and Protection | 240.4(D) | Unless specifically permitted in 240.4(E) or (G), the overcurrent protection shall not exceed that required by 240.4(D)(1) through (D)(8) after any correction factors for ambient temperature and number of conductors have been applied. [240.4(D)](https://2023.antflix.net#240.4(D)) | https://2023.antflix.net#240.4(D) |
Chapter 2 Wiring and Protection | 240.4(D)(1) | 7 amperes, provided all the following conditions are met: Continuous loads do not exceed 5.6 amperes.Overcurrent protection is provided by one of the following:Branch-circuit-rated circuit breakers listed and marked for use with 18 AWG copper conductorBranch-circuit-rated fuses listed and marked for use with 18 AWG cop... | https://2023.antflix.net#240.4(D)(1) |
Chapter 2 Wiring and Protection | 240.4(D)(2) | 10 amperes, provided all the following conditions are met: Continuous loads do not exceed 8 amperes.Overcurrent protection is provided by one of the following:Branch-circuit-rated circuit breakers listed and marked for use with 16 AWG copper conductorBranch-circuit-rated fuses listed and marked for use with 16 AWG copp... | https://2023.antflix.net#240.4(D)(2) |
Chapter 2 Wiring and Protection | 240.4(D)(3) | 10 amperes, provided all the following conditions are met: Continuous loads do not exceed 8 amperesOvercurrent protection is provided by one of the following:Branch-circuit-rated circuit breakers are listed and marked for use with 14 AWG copper-clad aluminum conductor.Branch-circuit-rated fuses are listed and marked fo... | https://2023.antflix.net#240.4(D)(3) |
Chapter 2 Wiring and Protection | 240.4(D)(4) | 15 amperes [240.4(D)(4)](https://2023.antflix.net#240.4(D)(4)) | https://2023.antflix.net#240.4(D)(4) |
Chapter 2 Wiring and Protection | 240.4(D)(5) | 15 amperes [240.4(D)(5)](https://2023.antflix.net#240.4(D)(5)) | https://2023.antflix.net#240.4(D)(5) |
Chapter 2 Wiring and Protection | 240.4(D)(6) | 20 amperes [240.4(D)(6)](https://2023.antflix.net#240.4(D)(6)) | https://2023.antflix.net#240.4(D)(6) |
Chapter 2 Wiring and Protection | 240.4(D)(7) | 25 amperes [240.4(D)(7)](https://2023.antflix.net#240.4(D)(7)) | https://2023.antflix.net#240.4(D)(7) |
Chapter 2 Wiring and Protection | 240.4(D)(8) | 30 amperes [240.4(D)(8)](https://2023.antflix.net#240.4(D)(8)) | https://2023.antflix.net#240.4(D)(8) |
Chapter 2 Wiring and Protection | 240.4(E) | Tap conductors shall be permitted to be protected against overcurrent in accordance with the following: 210.19(C) and (D), Household Ranges and Cooking Appliances and Other Loads240.5(B)(2), Fixture Wire240.21, Location in Circuit368.17(B), Reduction in Ampacity Size of Busway368.17(C), Feeder or Branch Circuits (buswa... | https://2023.antflix.net#240.4(E) |
Chapter 2 Wiring and Protection | 240.4(F) | Single-phase (other than 2-wire) and multiphase (other than delta-delta, 3-wire) transformer secondary conductors shall not be considered to be protected by the primary overcurrent protective device. Conductors supplied by the secondary side of a single-phase transformer having a 2-wire (single-voltage) secondary, or a... | https://2023.antflix.net#240.4(F) |
Chapter 2 Wiring and Protection | 240.4(G) | Overcurrent protection for the specific conductors shall be permitted to be provided as referenced in Table 240.4(G).Table 240.4(G) Specific Conductor Applications Conductor Article Section Air-conditioning and refrigeration equipment circuit conductors 440, Parts III, IV, VI Capacitor circuit conductors 460 ... | https://2023.antflix.net#240.4(G) |
Chapter 2 Wiring and Protection | 240.4(H) | Dwelling unit service and feeder conductors shall be permitted to be protected against overcurrent at the ampacity values in 310.12. [240.4(H)](https://2023.antflix.net#240.4(H)) | https://2023.antflix.net#240.4(H) |
Chapter 2 Wiring and Protection | 240.5 | Flexible cord and flexible cable, including tinsel cord and extension cords, and fixture wires shall be protected against overcurrent by either 240.5(A) or (B). [240.5](https://2023.antflix.net#240.5) | https://2023.antflix.net#240.5 |
Chapter 2 Wiring and Protection | 240.5(A) | Flexible cord and flexible cable shall be protected by an overcurrent device in accordance with their ampacity as specified in Table 400.5(A)(1) and Table 400.5(A)(2). Fixture wire shall be protected against overcurrent in accordance with its ampacity as specified in Table 402.5. Supplementary overcurrent protection, a... | https://2023.antflix.net#240.5(A) |
Chapter 2 Wiring and Protection | 240.5(B) | Flexible cord shall be protected, where supplied by a branch circuit, in accordance with one of the methods described in 240.5(B)(1), (B)(3), or (B)(4). Fixture wire shall be protected, where supplied by a branch circuit, in accordance with 240.5(B)(2). [240.5(B)](https://2023.antflix.net#240.5(B)) | https://2023.antflix.net#240.5(B) |
Chapter 2 Wiring and Protection | 240.5(B)(1) | Where flexible cord or tinsel cord is approved for and used with a specific listed appliance or luminaire, it shall be considered to be protected when applied within the appliance or luminaire listing requirements. For the purposes of this section, a luminaire may be either portable or permanent. [240.5(B)(1)](https://... | https://2023.antflix.net#240.5(B)(1) |
Chapter 2 Wiring and Protection | 240.5(B)(2) | Fixture wire shall be permitted to be tapped to the branch-circuit conductor of a branch circuit in accordance with the following: 15- or 20-ampere circuits - 18 AWG, up to 15 m (50 ft) of run length15- or 20-ampere circuits - 16 AWG, up to 30 m (100 ft) of run length20-ampere circuits - 14 AWG and larger30-ampere circ... | https://2023.antflix.net#240.5(B)(2) |
Chapter 2 Wiring and Protection | 240.5(B)(3) | Flexible cord used in listed extension cord sets shall be considered to be protected when applied within the extension cord listing requirements. [240.5(B)(3)](https://2023.antflix.net#240.5(B)(3)) | https://2023.antflix.net#240.5(B)(3) |
Chapter 2 Wiring and Protection | 240.5(B)(4) | Flexible cord used in extension cords made with separately listed and installed components shall be permitted to be supplied by a branch circuit in accordance with the following: 20-ampere circuits - 16 AWG and larger [240.5(B)(4)](https://2023.antflix.net#240.5(B)(4)) | https://2023.antflix.net#240.5(B)(4) |
Chapter 2 Wiring and Protection | 240.6(A) | The standard ampere ratings for fuses and inverse time circuit breakers shall be considered as shown in Table 240.6(A). Additional standard ampere ratings for fuses shall be 1, 3, 6, and 601. The use of fuses and inverse time circuit breakers with nonstandard ampere ratings shall be permitted.Table 240.6(A) Standard Am... | https://2023.antflix.net#240.6(A) |
Chapter 2 Wiring and Protection | 240.6(B) | The rating of adjustable-trip circuit breakers having external means for adjusting the current setting (long-time pickup setting), not meeting the requirements of 240.6(C), shall be the maximum setting possible. [240.6(B)](https://2023.antflix.net#240.6(B)) | https://2023.antflix.net#240.6(B) |
Chapter 2 Wiring and Protection | 240.6(C) | A circuit breaker(s) that has restricted access to the adjusting means shall be permitted to have an ampere rating(s) that is equal to the adjusted current setting (long-time pickup setting). Restricted access shall be achieved by one of the following methods: Located behind removable and sealable covers over the adjus... | https://2023.antflix.net#240.6(C) |
Chapter 2 Wiring and Protection | 240.6(D) | A circuit breaker(s) that can be adjusted remotely to modify the adjusting means shall be permitted to have an ampere rating(s) that is equal to the adjusted current setting (long-time pickup setting). Remote access shall be achieved by one of the following methods: Connected directly through a local non-networked inte... | https://2023.antflix.net#240.6(D) |
Chapter 2 Wiring and Protection | 240.7 | The following shall be listed: Branch-circuit overcurrent protective devicesRelays and circuit breakers providing ground-fault protection of equipmentGround-fault circuit interrupter devices [240.7](https://2023.antflix.net#240.7) | https://2023.antflix.net#240.7 |
Chapter 2 Wiring and Protection | 240.8 | Fuses and circuit breakers shall be permitted to be connected in parallel where they are factory assembled in parallel and listed as a unit. Individual fuses, circuit breakers, or combinations thereof shall not otherwise be connected in parallel. [240.8](https://2023.antflix.net#240.8) | https://2023.antflix.net#240.8 |
Chapter 2 Wiring and Protection | 240.9 | Thermal relays and other devices not designed to open short circuits or ground faults shall not be used for the protection of conductors against overcurrent due to short circuits or ground faults, but the use of such devices shall be permitted to protect motor branch-circuit conductors from overload if protected in acc... | https://2023.antflix.net#240.9 |
Chapter 2 Wiring and Protection | 240.10 | Where supplementary overcurrent protection is used for luminaires, appliances, and other equipment or for internal circuits and components of equipment, it shall not be used as a substitute for required branch-circuit overcurrent devices or in place of the required branch-circuit protection. Supplementary overcurrent d... | https://2023.antflix.net#240.10 |
Chapter 2 Wiring and Protection | 240.11 | If one or more feeder overcurrent protective devices are required to be selectively coordinated with a service overcurrent protective device by other requirements in this Code, all feeder overcurrent protective devices supplied directly by the service overcurrent protective device shall be selectively coordinated with ... | https://2023.antflix.net#240.11 |
Chapter 2 Wiring and Protection | 240.12 | Where an orderly shutdown is required to minimize the hazard(s) to personnel or equipment, a system of coordination based on the following two conditions shall be permitted: Coordinated short-circuit protectionOverload indication based on monitoring systems or devicesInformational Note: The monitoring system may cause ... | https://2023.antflix.net#240.12 |
Chapter 2 Wiring and Protection | 240.13 | Ground-fault protection of equipment shall be provided in accordance with 230.95 for solidly grounded wye electrical systems of more than 150 volts to ground but not exceeding 1000 volts phase-to-phase for each individual device used as a building or structure main disconnecting means rated 1000 amperes or more. This s... | https://2023.antflix.net#240.13 |
Chapter 2 Wiring and Protection | 240.15(A) | A fuse or an overcurrent trip unit of a circuit breaker shall be connected in series with each ungrounded conductor. A combination of a current transformer and overcurrent relay shall be considered equivalent to an overcurrent trip unit. Informational Note: See Parts III, IV, V, and XI of Article 430 for motor circuits... | https://2023.antflix.net#240.15(A) |
Chapter 2 Wiring and Protection | 240.15(B) | Circuit breakers shall open all ungrounded conductors of the circuit both manually and automatically unless otherwise permitted in 240.15(B)(1), (B)(2), (B)(3), and (B)(4). [240.15(B)](https://2023.antflix.net#240.15(B)) | https://2023.antflix.net#240.15(B) |
Chapter 2 Wiring and Protection | 240.15(B)(1) | Individual single-pole circuit breakers, with identified handle ties, shall be permitted as the protection for each ungrounded conductor of multiwire branch circuits that serve only single-phase line-to-neutral loads. [240.15(B)(1)](https://2023.antflix.net#240.15(B)(1)) | https://2023.antflix.net#240.15(B)(1) |
Chapter 2 Wiring and Protection | 240.15(B)(2) | In grounded systems, individual single-pole circuit breakers rated 120/240 volts ac, with identified handle ties, shall be permitted as the protection for each ungrounded conductor for line-to-line connected loads for single-phase circuits. [240.15(B)(2)](https://2023.antflix.net#240.15(B)(2)) | https://2023.antflix.net#240.15(B)(2) |
Chapter 2 Wiring and Protection | 240.15(B)(3) | For line-to-line loads in 4-wire, 3-phase systems or 5-wire, 2-phase systems, individual single-pole circuit breakers rated 120/240 volts ac with identified handle ties shall be permitted as the protection for each ungrounded conductor, if the systems have a grounded neutral point and the voltage to ground does not exc... | https://2023.antflix.net#240.15(B)(3) |
Chapter 2 Wiring and Protection | 240.15(B)(4) | Individual single-pole circuit breakers rated 125/250 volts dc with identified handle ties shall be permitted as the protection for each ungrounded conductor for line-to-line connected loads for 3-wire, direct-current circuits supplied from a system with a grounded neutral where the voltage to ground does not exceed 12... | https://2023.antflix.net#240.15(B)(4) |
Chapter 2 Wiring and Protection | 240.16 | Branch-circuit overcurrent protective devices shall have an interrupting rating no less than 5000 amperes. [240.16](https://2023.antflix.net#240.16) | https://2023.antflix.net#240.16 |
Chapter 2 Wiring and Protection | 240.21 | Overcurrent protection shall be provided in each ungrounded circuit conductor and shall be located at the point where the conductors receive their supply except as specified in 240.21(A) through (H). Conductors supplied under 240.21(A) through (H) shall not supply another conductor except through an overcurrent protect... | https://2023.antflix.net#240.21 |
Chapter 2 Wiring and Protection | 240.21(A) | Branch-circuit tap conductors meeting the requirements specified in 210.19 shall be permitted to have overcurrent protection as specified in 210.20. [240.21(A)](https://2023.antflix.net#240.21(A)) | https://2023.antflix.net#240.21(A) |
Chapter 2 Wiring and Protection | 240.21(B) | Conductors shall be permitted to be tapped, without overcurrent protection at the tap, to a feeder as specified in 240.21(B)(1) through (B)(5). The tap shall be permitted at any point on the load side of the feeder overcurrent protective device. Section 240.4(B) shall not be permitted for tap conductors. [240.21(B)](ht... | https://2023.antflix.net#240.21(B) |
Chapter 2 Wiring and Protection | 240.21(B)(1) | If the length of the tap conductors does not exceed 3 m (10 ft) and the tap conductors comply with all of the following: The ampacity of the tap conductors is as follows:Not less than the combined calculated loads on the circuits supplied by the tap conductorsNot less than the rating of the equipment containing an over... | https://2023.antflix.net#240.21(B)(1) |
Chapter 2 Wiring and Protection | 240.21(B)(2) | Where the length of the tap conductors does not exceed 7.5 m (25 ft) and the tap conductors comply with all the following: The ampacity of the tap conductors is not less than one-third of the rating of the overcurrent device protecting the feeder conductors.The tap conductors terminate in a single circuit breaker or a ... | https://2023.antflix.net#240.21(B)(2) |
Chapter 2 Wiring and Protection | 240.21(B)(3) | Where the tap conductors supply a transformer and comply with all the following conditions: The conductors supplying the primary of a transformer have an ampacity at least one-third the rating of the overcurrent device protecting the feeder conductors.The conductors supplied by the secondary of the transformer shall ha... | https://2023.antflix.net#240.21(B)(3) |
Chapter 2 Wiring and Protection | 240.21(B)(4) | Where the feeder is in a high bay manufacturing building over 11 m (35 ft) high at walls and the installation complies with all the following conditions: Conditions of maintenance and supervision ensure that only qualified persons service the systems.The tap conductors are not over 7.5 m (25 ft) long horizontally and n... | https://2023.antflix.net#240.21(B)(4) |
Chapter 2 Wiring and Protection | 240.21(B)(5) | Where the conductors are located outside of a building or structure, except at the point of load termination, and comply with all of the following conditions: The tap conductors are protected from physical damage in an approved manner.The tap conductors terminate at a single circuit breaker or a single set of fuses tha... | https://2023.antflix.net#240.21(B)(5) |
Chapter 2 Wiring and Protection | 240.21(C) | A set of conductors feeding a single load, or each set of conductors feeding separate loads, shall be permitted to be connected to a transformer secondary, without overcurrent protection at the secondary, as specified in 240.21(C)(1) through (C)(6). Section 240.4(B) shall not be permitted for transformer secondary cond... | https://2023.antflix.net#240.21(C) |
Chapter 2 Wiring and Protection | 240.21(C)(1) | Conductors supplied by the secondary side of a single-phase transformer having a 2-wire (single-voltage) secondary, or a three-phase, delta-delta connected transformer having a 3-wire (single-voltage) secondary, shall be permitted to be protected by overcurrent protection provided on the primary (supply) side of the tr... | https://2023.antflix.net#240.21(C)(1) |
Chapter 2 Wiring and Protection | 240.21(C)(2) | If the length of secondary conductor does not exceed 3 m (10 ft) and complies with all of the following: The ampacity of the secondary conductors is as follows:Not less than the combined calculated loads on the circuits supplied by the secondary conductorsNot less than the rating of the equipment containing an overcurr... | https://2023.antflix.net#240.21(C)(2) |
Chapter 2 Wiring and Protection | 240.21(C)(3) | For the supply of switchgear or switchboards in industrial installations only, where the length of the secondary conductors does not exceed 7.5 m (25 ft) and complies with all of the following: Conditions of maintenance and supervision ensure that only qualified persons service the systems.The ampacity of the secondary... | https://2023.antflix.net#240.21(C)(3) |
Chapter 2 Wiring and Protection | 240.21(C)(4) | Where the conductors are located outside of a building or structure, except at the point of load termination, and comply with all of the following conditions: The conductors are protected from physical damage in an approved manner.The conductors terminate at a single circuit breaker or a single set of fuses that limit ... | https://2023.antflix.net#240.21(C)(4) |
Chapter 2 Wiring and Protection | 240.21(C)(5) | Transformer secondary conductors installed in accordance with 240.21(B)(3) shall be permitted to have overcurrent protection as specified in that section. [240.21(C)(5)](https://2023.antflix.net#240.21(C)(5)) | https://2023.antflix.net#240.21(C)(5) |
Chapter 2 Wiring and Protection | 240.21(C)(6) | Where the length of secondary conductor does not exceed 7.5 m (25 ft) and complies with all of the following: The secondary conductors shall have an ampacity that is not less than the value of the primary-to-secondary voltage ratio multiplied by one-third of the rating of the overcurrent device protecting the primary o... | https://2023.antflix.net#240.21(C)(6) |
Chapter 2 Wiring and Protection | 240.21(D) | Service conductors shall be permitted to be protected by overcurrent devices in accordance with 230.91. [240.21(D)](https://2023.antflix.net#240.21(D)) | https://2023.antflix.net#240.21(D) |
Chapter 2 Wiring and Protection | 240.21(E) | Busways and busway taps shall be permitted to be protected against overcurrent in accordance with 368.17. [240.21(E)](https://2023.antflix.net#240.21(E)) | https://2023.antflix.net#240.21(E) |
Chapter 2 Wiring and Protection | 240.21(F) | Motor-feeder and branch-circuit conductors shall be permitted to be protected against overcurrent in accordance with 430.28 and 430.53, respectively. [240.21(F)](https://2023.antflix.net#240.21(F)) | https://2023.antflix.net#240.21(F) |
Chapter 2 Wiring and Protection | 240.21(G) | Conductors from generator terminals that meet the size requirement in 445.13 shall be permitted to be protected against overload by the generator overload protective device(s) required by 445.12. [240.21(G)](https://2023.antflix.net#240.21(G)) | https://2023.antflix.net#240.21(G) |
Chapter 2 Wiring and Protection | 240.21(H) | Overcurrent protection shall be permitted to be installed as close as practicable to the storage battery terminals in an unclassified location. Installation of the overcurrent protection within a hazardous (classified) location shall also be permitted. [240.21(H)](https://2023.antflix.net#240.21(H)) | https://2023.antflix.net#240.21(H) |
Chapter 2 Wiring and Protection | 240.22 | No overcurrent device shall be connected in series with any conductor that is intentionally grounded, unless one of the following two conditions is met: The overcurrent device opens all conductors of the circuit, including the grounded conductor, and is designed so that no pole can operate independently.Where required ... | https://2023.antflix.net#240.22 |
Chapter 2 Wiring and Protection | 240.24(A) | Circuit breakers and switches containing fuses shall be readily accessible and installed so that the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is not more than 2.0 m (6 ft 7 in.) above the floor or working platform, unless one of the following applies: Fo... | https://2023.antflix.net#240.24(A) |
Chapter 2 Wiring and Protection | 240.24(B) | Each occupant shall have ready access to all overcurrent devices protecting the conductors supplying that occupancy, unless otherwise permitted in 240.24(B)(1) and (B)(2). [240.24(B)](https://2023.antflix.net#240.24(B)) | https://2023.antflix.net#240.24(B) |
Chapter 2 Wiring and Protection | 240.24(B)(1) | Where electric service and electrical maintenance are provided by the building management and where these are under continuous building management supervision, the service overcurrent protective devices and feeder overcurrent protective devices supplying more than one occupancy shall be permitted to be accessible only ... | https://2023.antflix.net#240.24(B)(1) |
Chapter 2 Wiring and Protection | 240.24(B)(2) | Where electric service and electrical maintenance are provided by the building management and where these are under continuous building management supervision, the branch-circuit overcurrent protective devices supplying any guest rooms, guest suites, or sleeping rooms in dormitory units without permanent provisions for... | https://2023.antflix.net#240.24(B)(2) |
Chapter 2 Wiring and Protection | 240.24(C) | Overcurrent protective devices shall be located where they will not be exposed to physical damage. Informational Note: See 110.11 for information on deteriorating agents that could cause physical damage. [240.24(C)](https://2023.antflix.net#240.24(C)) | https://2023.antflix.net#240.24(C) |
Chapter 2 Wiring and Protection | 240.24(D) | Overcurrent protective devices shall not be located in the vicinity of easily ignitible material, such as in clothes closets. [240.24(D)](https://2023.antflix.net#240.24(D)) | https://2023.antflix.net#240.24(D) |
Chapter 2 Wiring and Protection | 240.24(E) | Overcurrent protective devices, other than supplementary overcurrent protection, shall not be located in bathrooms, showering facilities, or locker rooms with showering facilities. [240.24(E)](https://2023.antflix.net#240.24(E)) | https://2023.antflix.net#240.24(E) |
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