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Chapter 3 Wiring Methods and Materials | 300.6(A) | Ferrous metal raceways, cable trays, cablebus, auxiliary gutters, cable armor, boxes, cable sheathing, cabinets, enclosures (other than surrounding fences and walls), elbows, couplings, nipples, fittings, supports, and support hardware shall be suitably protected against corrosion inside and outside (except threads at ... | https://2023.antflix.net#300.6(A) |
Chapter 3 Wiring Methods and Materials | 300.6(A)(1) | Where protected from corrosion solely by enamel, ferrous metal raceways, cable trays, cablebus, auxiliary gutters, cable armor, boxes, cable sheathing, cabinets, enclosures (other than surrounding fences and walls), elbows, couplings, nipples, fittings, supports, and support hardware shall not be used outdoors or in we... | https://2023.antflix.net#300.6(A)(1) |
Chapter 3 Wiring Methods and Materials | 300.6(A)(2) | Where boxes, cabinets, or enclosures (other than surrounding fences and walls) have an approved system of organic coatings and are marked "Raintight," "Rainproof," or "Outdoor Type," they shall be permitted outdoors. [300.6(A)(2)](https://2023.antflix.net#300.6(A)(2)) | https://2023.antflix.net#300.6(A)(2) |
Chapter 3 Wiring Methods and Materials | 300.6(A)(3) | Ferrous metal raceways, cable armor, boxes, cable sheathing, cabinets, enclosures (other than surrounding fences and walls), elbows, couplings, nipples, fittings, supports, and support hardware shall be permitted to be installed in concrete, in direct contact with the earth, or in areas subject to severe corrosive infl... | https://2023.antflix.net#300.6(A)(3) |
Chapter 3 Wiring Methods and Materials | 300.6(B) | Aluminum raceways, cable trays, cablebus, auxiliary gutters, cable armor, boxes, cable sheathing, cabinets, enclosures (other than surrounding fences and walls), elbows, couplings, nipples, fittings, supports, and support hardware embedded or encased in concrete or in direct contact with the earth shall be provided wit... | https://2023.antflix.net#300.6(B) |
Chapter 3 Wiring Methods and Materials | 300.6(C) | Nonmetallic raceways, cable trays, cablebus, auxiliary gutters, boxes, cables with a nonmetallic outer jacket and internal metal armor or jacket, cable sheathing, cabinets, enclosures (other than surrounding fences and walls), elbows, couplings, nipples, fittings, supports, and support hardware shall be made of materia... | https://2023.antflix.net#300.6(C) |
Chapter 3 Wiring Methods and Materials | 300.6(C)(1) | Where exposed to sunlight, the materials shall be listed as sunlight resistant or shall be identified as sunlight resistant. [300.6(C)(1)](https://2023.antflix.net#300.6(C)(1)) | https://2023.antflix.net#300.6(C)(1) |
Chapter 3 Wiring Methods and Materials | 300.6(C)(2) | Where subject to exposure to chemical solvents, vapors, splashing, or immersion, materials or coatings shall either be inherently resistant to chemicals based on their listing or be identified for the specific chemical reagent. [300.6(C)(2)](https://2023.antflix.net#300.6(C)(2)) | https://2023.antflix.net#300.6(C)(2) |
Chapter 3 Wiring Methods and Materials | 300.6(D) | In portions of dairy processing facilities, laundries, canneries, and other indoor wet locations, and in locations where walls are frequently washed or where there are surfaces of absorbent materials, such as damp paper or wood, the entire wiring system, where installed exposed, including all boxes, cabinets, enclosure... | https://2023.antflix.net#300.6(D) |
Chapter 3 Wiring Methods and Materials | 300.7(A) | Where portions of a raceway or sleeve are known to be subjected to different temperatures, and where condensation is known to be a problem, as in cold storage areas of buildings or where passing from the interior to the exterior of a building, the raceway or sleeve shall be sealed to prevent the circulation of warm air... | https://2023.antflix.net#300.7(A) |
Chapter 3 Wiring Methods and Materials | 300.7(B) | Raceways shall be provided with expansion, expansion-deflection, or deflection fittings where necessary to compensate for thermal expansion, deflection, and contraction. Informational Note No. 1: Table 352.44(A) and Table 355.44 provide the expansion information for polyvinyl chloride (PVC) and for reinforced thermoset... | https://2023.antflix.net#300.7(B) |
Chapter 3 Wiring Methods and Materials | 300.8 | Raceways or cable trays containing electrical conductors shall not contain any pipe, tube, or equal for steam, water, air, gas, drainage, or any service other than electrical. [300.8](https://2023.antflix.net#300.8) | https://2023.antflix.net#300.8 |
Chapter 3 Wiring Methods and Materials | 300.9 | Where raceways are installed in wet locations above grade, the interior of these raceways shall be considered to be a wet location. Insulated conductors and cables installed in raceways in wet locations above grade shall comply with 310.10(C). [300.9](https://2023.antflix.net#300.9) | https://2023.antflix.net#300.9 |
Chapter 3 Wiring Methods and Materials | 300.10 | Metal raceways, cable armor, and other metal enclosures for conductors shall be metallically joined together into a continuous electrical conductor and shall be connected to all boxes, fittings, and cabinets to provide effective electrical continuity. Unless specifically permitted elsewhere in this Code, raceways and c... | https://2023.antflix.net#300.10 |
Chapter 3 Wiring Methods and Materials | 300.11(A) | Raceways, cable assemblies, boxes, cabinets, and fittings shall be securely fastened in place. [300.11(A)](https://2023.antflix.net#300.11(A)) | https://2023.antflix.net#300.11(A) |
Chapter 3 Wiring Methods and Materials | 300.11(B) | Support wires that do not provide secure support shall not be the sole support. Support wires and associated fittings that provide secure support and that are installed in addition to the ceiling grid support wires shall be permitted as the sole support. Where independent support wires are used, they shall be secured a... | https://2023.antflix.net#300.11(B) |
Chapter 3 Wiring Methods and Materials | 300.11(B)(1) | Wiring located within the cavity of a fire-rated floor-ceiling or roof-ceiling assembly shall not be secured to, or supported by, the ceiling assembly, including the ceiling support wires. An independent means of secure support shall be provided and shall be permitted to be attached to the assembly. Where independent s... | https://2023.antflix.net#300.11(B)(1) |
Chapter 3 Wiring Methods and Materials | 300.11(B)(2) | Wiring located within the cavity of a non-fire-rated floor-ceiling or roof-ceiling assembly shall not be secured to, or supported by, the ceiling assembly, including the ceiling support wires. An independent means of secure support shall be provided and shall be permitted to be attached to the assembly. Where independe... | https://2023.antflix.net#300.11(B)(2) |
Chapter 3 Wiring Methods and Materials | 300.11(C) | Raceways shall be used only as a means of support for other raceways, cables, or nonelectrical equipment under any of the following conditions: Where the raceway or means of support is identified as a means of supportWhere the raceway contains power supply conductors for electrically controlled equipment and is used to... | https://2023.antflix.net#300.11(C) |
Chapter 3 Wiring Methods and Materials | 300.11(D) | Cable wiring methods shall not be used as a means of support for other cables, raceways, or nonelectrical equipment. [300.11(D)](https://2023.antflix.net#300.11(D)) | https://2023.antflix.net#300.11(D) |
Chapter 3 Wiring Methods and Materials | 300.12 | Raceways, cable armors, and cable sheaths shall be continuous between cabinets, boxes, conduit bodies, fittings, or other enclosures or outlets. Exception No. 1: Short sections of raceways used to provide support or protection of cable assemblies from physical damage shall not be required to be mechanically continuous.... | https://2023.antflix.net#300.12 |
Chapter 3 Wiring Methods and Materials | 300.13(A) | Conductors in raceways shall be continuous between outlets, boxes, devices, and so forth. There shall be no splice or tap within a raceway unless permitted by 300.15, 368.56(A), 376.56, 378.56, 384.56, 386.56, 388.56, or 390.56. [300.13(A)](https://2023.antflix.net#300.13(A)) | https://2023.antflix.net#300.13(A) |
Chapter 3 Wiring Methods and Materials | 300.13(B) | In multiwire branch circuits, the continuity of a grounded conductor shall not depend on device connections such as lampholders, receptacles, and so forth where the removal of such devices would interrupt the continuity. [300.13(B)](https://2023.antflix.net#300.13(B)) | https://2023.antflix.net#300.13(B) |
Chapter 3 Wiring Methods and Materials | 300.14 | At least 150 mm (6 in.) of free conductor, measured from the point in the box where it emerges from its raceway or cable sheath, shall be left at each outlet, junction, and switch point for splices or the connection of luminaires or devices. The 150 mm (6 in.) free conductor shall be permitted to be spliced or unsplice... | https://2023.antflix.net#300.14 |
Chapter 3 Wiring Methods and Materials | 300.15 | A box shall be installed at each outlet and switch point for concealed knob-and-tube wiring. Fittings and connectors shall be used only with the specific wiring methods for which they are designed and listed. Where the wiring method is conduit, tubing, Type AC cable, Type MC cable, Type MI cable, nonmetallic-sheathed c... | https://2023.antflix.net#300.15 |
Chapter 3 Wiring Methods and Materials | 300.15(A) | A box or conduit body shall not be required for each splice, junction, switch, pull, termination, or outlet points in wiring methods with removable covers, such as wireways, multioutlet assemblies, auxiliary gutters, and surface raceways. The covers shall be accessible after installation. [300.15(A)](https://2023.antfl... | https://2023.antflix.net#300.15(A) |
Chapter 3 Wiring Methods and Materials | 300.15(B) | An integral junction box or wiring compartment as part of approved equipment shall be permitted in lieu of a box. [300.15(B)](https://2023.antflix.net#300.15(B)) | https://2023.antflix.net#300.15(B) |
Chapter 3 Wiring Methods and Materials | 300.15(C) | A box or conduit body shall not be required where cables enter or exit from conduit or tubing that is used to provide cable support or protection against physical damage. A fitting shall be provided on the end(s) of the conduit or tubing to protect the cable from abrasion. [300.15(C)](https://2023.antflix.net#300.15(C)... | https://2023.antflix.net#300.15(C) |
Chapter 3 Wiring Methods and Materials | 300.15(D) | A box or conduit body shall not be required where accessible fittings are used for straight-through splices in mineral-insulated metal-sheathed cable. [300.15(D)](https://2023.antflix.net#300.15(D)) | https://2023.antflix.net#300.15(D) |
Chapter 3 Wiring Methods and Materials | 300.15(E) | A wiring device with integral enclosure identified for the use, having brackets that securely fasten the device to walls or ceilings of conventional on-site frame construction, for use with nonmetallic-sheathed cable, shall be permitted in lieu of a box or conduit body. Informational Note: See 334.30(C); 545.10; 550.15... | https://2023.antflix.net#300.15(E) |
Chapter 3 Wiring Methods and Materials | 300.15(F) | A fitting identified for the use shall be permitted in lieu of a box or conduit body where conductors are not spliced or terminated within the fitting. The fitting shall be accessible after installation, unless listed for concealed installation. [300.15(F)](https://2023.antflix.net#300.15(F)) | https://2023.antflix.net#300.15(F) |
Chapter 3 Wiring Methods and Materials | 300.15(G) | As permitted in 300.5(E), a box or conduit body shall not be required for splices and taps in direct-buried conductors and cables. [300.15(G)](https://2023.antflix.net#300.15(G)) | https://2023.antflix.net#300.15(G) |
Chapter 3 Wiring Methods and Materials | 300.15(H) | As permitted in 334.40(B), a box or conduit body shall not be required for insulated devices supplied by nonmetallic-sheathed cable. [300.15(H)](https://2023.antflix.net#300.15(H)) | https://2023.antflix.net#300.15(H) |
Chapter 3 Wiring Methods and Materials | 300.15(I) | A box or conduit body shall not be required where a splice, switch, terminal, or pull point is in a cabinet or cutout box, in an enclosure for a switch or overcurrent device as permitted in 312.8, in a motor controller as permitted in 430.10(A), or in a motor control center. [300.15(I)](https://2023.antflix.net#300.15(... | https://2023.antflix.net#300.15(I) |
Chapter 3 Wiring Methods and Materials | 300.15(J) | A box or conduit body shall not be required where a luminaire is used as a raceway as permitted in 410.64. [300.15(J)](https://2023.antflix.net#300.15(J)) | https://2023.antflix.net#300.15(J) |
Chapter 3 Wiring Methods and Materials | 300.15(K) | A box or conduit body shall not be required for splices where conductors are embedded as permitted in 424.40, 424.41 (D), 426.22(C), 426.24(A), and 427.19(A). [300.15(K)](https://2023.antflix.net#300.15(K)) | https://2023.antflix.net#300.15(K) |
Chapter 3 Wiring Methods and Materials | 300.15(L) | A box or conduit body shall not be required for conductors in manholes or handhole enclosures, except where connecting to electrical equipment. The installation shall comply with Part V of Article 110 for manholes, and 314.30 for handhole enclosures. [300.15(L)](https://2023.antflix.net#300.15(L)) | https://2023.antflix.net#300.15(L) |
Chapter 3 Wiring Methods and Materials | 300.16(A) | A box, conduit body, or terminal fitting having a separately bushed hole for each conductor shall be used wherever a change is made from conduit, electrical metallic tubing, electrical nonmetallic tubing, nonmetallic-sheathed cable, Type AC cable, Type MC cable, or mineral-insulated, metal-sheathed cable and surface ra... | https://2023.antflix.net#300.16(A) |
Chapter 3 Wiring Methods and Materials | 300.16(B) | A bushing shall be permitted in lieu of a box or terminal where the conductors emerge from a raceway and enter or terminate at equipment, such as open switchboards, unenclosed control equipment, or similar equipment. The bushing shall be of the insulating type for other than lead-sheathed conductors. [300.16(B)](https:... | https://2023.antflix.net#300.16(B) |
Chapter 3 Wiring Methods and Materials | 300.17 | The number and size of conductors and cables in any raceway shall not be more than will permit dissipation of the heat and ready installation or withdrawal of the conductors or cables without damage to the conductors or cables, or to their insulation. Informational Note: See the following sections of this Code. interme... | https://2023.antflix.net#300.17 |
Chapter 3 Wiring Methods and Materials | 300.18(A) | Raceways other than busways, listed manufactured assemblies in accordance with 604.100, or exposed raceways having hinged or removable covers shall be installed complete between outlet, junction, or splicing points prior to the installation of conductors or cables. Where required to facilitate the installation of utili... | https://2023.antflix.net#300.18(A) |
Chapter 3 Wiring Methods and Materials | 300.18(B) | Metal raceways shall not be supported, terminated, or connected by welding to the raceway unless specifically designed to be or otherwise specifically permitted to be in this Code. [300.18(B)](https://2023.antflix.net#300.18(B)) | https://2023.antflix.net#300.18(B) |
Chapter 3 Wiring Methods and Materials | 300.19(A) | Conductors in vertical raceways shall be supported if the vertical rise exceeds the values in Table 300.19(A). At least one support method shall be provided for each conductor at the top of the vertical raceway or as close to the top as practical. Intermediate supports shall be provided as necessary to limit supported ... | https://2023.antflix.net#300.19(A) |
Chapter 3 Wiring Methods and Materials | 300.19(B) | Support methods and spacing intervals for fire-resistive cables and conductors shall comply with any restrictions provided in the listing of the electrical circuit protective system or fire-resistive cable system used and in no case shall exceed the values in Table 300.19(A). [300.19(B)](https://2023.antflix.net#300.19... | https://2023.antflix.net#300.19(B) |
Chapter 3 Wiring Methods and Materials | 300.19(C) | One of the following methods of support shall be used: Clamping devices constructed of or employing insulating wedges inserted in the ends of the raceways. Where clamping of insulation does not adequately support the cable, the conductor also shall be clamped.Inserting boxes at the required intervals in which insulatin... | https://2023.antflix.net#300.19(C) |
Chapter 3 Wiring Methods and Materials | 300.20(A) | Where conductors carrying alternating current are installed in ferrous metal enclosures or ferrous metal raceways, they shall be arranged so as to avoid heating the surrounding ferrous metal by induction. To accomplish this, all phase conductors and, where used, the grounded conductor and all equipment grounding conduc... | https://2023.antflix.net#300.20(A) |
Chapter 3 Wiring Methods and Materials | 300.20(B) | Where a single conductor carrying alternating current passes through metal with magnetic properties, the inductive effect shall be minimized by either cutting slots in the metal between the individual holes through which the individual conductors pass or passing all the conductors in the circuit through an insulating w... | https://2023.antflix.net#300.20(B) |
Chapter 3 Wiring Methods and Materials | 300.21 | Electrical installations in hollow spaces, vertical shafts, and ventilation or air-handling ducts shall be made so that the possible spread of fire or products of combustion will not be substantially increased. Openings around electrical penetrations into or through fire-resistant-rated walls, partitions, floors, or ce... | https://2023.antflix.net#300.21 |
Chapter 3 Wiring Methods and Materials | 300.22 | The requirements of this section shall apply to the installation and uses of electrical wiring and equipment in ducts used for dust, loose stock, or vapor removal; ducts specifically fabricated for environmental air; and other spaces used for environmental air (plenums). Informational Note: See Part VI of Article 424 f... | https://2023.antflix.net#300.22 |
Chapter 3 Wiring Methods and Materials | 300.22(A) | No wiring systems of any type shall be installed in ducts used to transport dust, loose stock, or flammable vapors. No wiring system of any type shall be installed in any duct, or shaft containing only such ducts, used for vapor removal or for ventilation of commercial-type cooking equipment. [300.22(A)](https://2023.a... | https://2023.antflix.net#300.22(A) |
Chapter 3 Wiring Methods and Materials | 300.22(B) | Equipment, devices, and the wiring methods specified in this section shall be permitted within such ducts only if necessary for the direct action upon, or sensing of, the contained air. Where equipment or devices are installed and illumination is necessary to facilitate maintenance and repair, enclosed gasketed-type lu... | https://2023.antflix.net#300.22(B) |
Chapter 3 Wiring Methods and Materials | 300.22(C) | This section shall apply to spaces not specifically fabricated for environmental air-handling purposes but used for air-handling purposes as a plenum. This section shall not apply to habitable rooms or areas of buildings, the prime purpose of which is not air handling. Informational Note No. 1: The space over a hung ce... | https://2023.antflix.net#300.22(C) |
Chapter 3 Wiring Methods and Materials | 300.22(C)(1) | The wiring methods for other spaces used for environmental air shall be limited to totally enclosed, nonventilated, insulated busway having no provisions for plugin connections, Type MI cable without an overall nonmetallic covering, Type MC cable without an overall nonmetallic covering, Type AC cable, or other factory-... | https://2023.antflix.net#300.22(C)(1) |
Chapter 3 Wiring Methods and Materials | 300.22(C)(2) | The requirements in 300.22(C)(2)(a) or (C)(2)(b) shall apply to the use of metallic cable tray systems in other spaces used for environmental air (plenums), where accessible. Metal Cable Tray Systems. Metal cable tray systems shall be permitted to support the wiring methods specified in 300.22(C)(1).Solid Side and Bott... | https://2023.antflix.net#300.22(C)(2) |
Chapter 3 Wiring Methods and Materials | 300.22(C)(3) | Electrical equipment with a metal enclosure, or electrical equipment with a nonmetallic enclosure listed for use within an air-handling space and having low smoke and heat release properties, and associated wiring material suitable for the ambient temperature shall be permitted to be installed in such other spaces unle... | https://2023.antflix.net#300.22(C)(3) |
Chapter 3 Wiring Methods and Materials | 300.22(D) | Where the installation complies with the special requirements specified in 645.4, electrical wiring in air-handling areas beneath raised floors for information technology equipment shall be permitted in accordance with 645.5(E). [300.22(D)](https://2023.antflix.net#300.22(D)) | https://2023.antflix.net#300.22(D) |
Chapter 3 Wiring Methods and Materials | 300.23 | Cables, raceways, and equipment installed behind panels designed to allow access, including suspended ceiling panels, shall be arranged and secured to allow the removal of panels and access to the equipment. [300.23](https://2023.antflix.net#300.23) | https://2023.antflix.net#300.23 |
Chapter 3 Wiring Methods and Materials | 300.25 | Where an exit enclosure is required to have a fire resistance rating, only electrical wiring methods serving equipment permitted by the authority having jurisdiction in the exit enclosure shall be installed within the exit enclosure. Exception: Where egress lighting is required on outside exterior doorways from the exi... | https://2023.antflix.net#300.25 |
Chapter 3 Wiring Methods and Materials | 300.26 | Remote-control and signaling circuits shall be classified as either power-limited or non-power-limited and comply with the following:Class 1 power-limited remote-control and signaling circuits shall comply with 724.3.Class 2 and Class 3 power-limited remote-control and signaling circuits shall comply with 725.3.Non-pow... | https://2023.antflix.net#300.26 |
Chapter 3 Wiring Methods and Materials | 305.1 | This article covers wiring methods and materials for systems rated over 1000 volts ac, 1500 volts dc, nominal. [305.1](https://2023.antflix.net#305.1) | https://2023.antflix.net#305.1 |
Chapter 3 Wiring Methods and Materials | 305.3 | Conductors shall be permitted to be installed in accordance with any of the wiring methods identified in Table 305.3. Exposed runs of Type MV cables, bare conductors, and bare busbars shall be permitted in locations accessible only to qualified persons. Busbars shall be permitted to be either copper or aluminum. Except... | https://2023.antflix.net#305.3 |
Chapter 3 Wiring Methods and Materials | 305.4 | Conductors of circuits rated over 1000 volts ac, 1500 volts dc, nominal, shall not occupy the same equipment wiring enclosure, cable, or raceway with conductors of circuits rated 1000 volts ac, 1500 volts dc, nominal, or less unless otherwise permitted as follows: Where contained within the individual wiring enclosure,... | https://2023.antflix.net#305.4 |
Chapter 3 Wiring Methods and Materials | 305.5 | The conductor shall not be bent to a radius less than 8 times the overall diameter for nonshielded conductors or 12 times the overall diameter for shielded or lead-covered conductors during or after installation. For multiconductor or multiplexed single-conductor cables having individually shielded conductors, the mini... | https://2023.antflix.net#305.5 |
Chapter 3 Wiring Methods and Materials | 305.6 | Metallic raceways and associated conductors shall be arranged to avoid heating of the raceway in accordance with 300.20. [305.6](https://2023.antflix.net#305.6) | https://2023.antflix.net#305.6 |
Chapter 3 Wiring Methods and Materials | 305.7 | Suitable covers shall be installed on all boxes, fittings, and similar enclosures to prevent accidental contact with energized parts or physical damage to parts or insulation. [305.7](https://2023.antflix.net#305.7) | https://2023.antflix.net#305.7 |
Chapter 3 Wiring Methods and Materials | 305.8 | Where raceways are installed in wet locations above grade, the interior of these raceways shall be considered to be a wet location. Insulated conductors and cables installed in raceways in wet locations above grade shall be either moisture-impervious metal-sheathed or of a type listed for use in wet locations. [305.8](... | https://2023.antflix.net#305.8 |
Chapter 3 Wiring Methods and Materials | 305.9 | Exposed runs of braid-covered insulated conductors shall have a flame-retardant braid. If the conductors used do not have this protection, a flame-retardant saturant shall be applied to the braid covering after installation. This treated braid covering shall be stripped back a safe distance at conductor terminals, acco... | https://2023.antflix.net#305.9 |
Chapter 3 Wiring Methods and Materials | 305.10 | Metallic and semiconducting insulation shielding components of shielded cables shall be removed for a distance dependent on the circuit voltage and insulation. Stress reduction means shall be provided at all terminations of factory-applied shielding. Metallic shielding components such as tapes, wires, or braids, or com... | https://2023.antflix.net#305.10 |
Chapter 3 Wiring Methods and Materials | 305.11 | Where cable conductors emerge from a metal sheath and where protection against moisture or physical damage is necessary, the insulation of the conductors shall be protected by a cable sheath terminating device. [305.11](https://2023.antflix.net#305.11) | https://2023.antflix.net#305.11 |
Chapter 3 Wiring Methods and Materials | 305.12 | Danger signs shall be conspicuously posted at points of access to conductors in all raceway systems and cable systems. The sign(s) shall meet the requirements in 110.21(B), shall be readily visible, and shall state the following: DANGER-HIGH VOLTAGE-KEEP OUT [305.12](https://2023.antflix.net#305.12) | https://2023.antflix.net#305.12 |
Chapter 3 Wiring Methods and Materials | 305.15(A) | Underground conductors shall be identified for the voltage and conditions under which they are installed. Conductors used for direct-burial applications shall be of a type identified for such use. Underground cables shall be installed in accordance with 305.15(A)(1), (A)(2), or (A)(3), and the installation shall meet t... | https://2023.antflix.net#305.15(A) |
Chapter 3 Wiring Methods and Materials | 305.15(A)(1) | Underground cables, including nonshielded, Type MC and moisture-impervious metal sheath cables, shall have those sheaths grounded through an effective grounding path meeting the requirements of 250.4(A)(5) or 250.4(B)(4). They shall be direct buried or installed in raceways identified for the use. [305.15(A)(1)](https:... | https://2023.antflix.net#305.15(A)(1) |
Chapter 3 Wiring Methods and Materials | 305.15(A)(2) | In industrial establishments, where conditions of maintenance and supervision ensure that only qualified persons service the installed cable, nonshielded single-conductor cables with insulation types up to 2000 volts that are listed for direct burial shall be permitted to be directly buried. [305.15(A)(2)](https://2023... | https://2023.antflix.net#305.15(A)(2) |
Chapter 3 Wiring Methods and Materials | 305.15(A)(3) | Other nonshielded cables not covered in 305.15(A)(1) or (A)(2) shall be installed in rigid metal conduit, intermediate metal conduit, or rigid nonmetallic conduit encased in not less than 75 mm (3 in.) of concrete. [305.15(A)(3)](https://2023.antflix.net#305.15(A)(3)) | https://2023.antflix.net#305.15(A)(3) |
Chapter 3 Wiring Methods and Materials | 305.15(B) | The interior of enclosures or raceways installed underground shall be considered to be a wet location. Insulated conductors and cables installed in these enclosures or raceways in underground installations shall be listed for use in wet locations and shall be either moisture-impervious metal-sheathed or of a type liste... | https://2023.antflix.net#305.15(B) |
Chapter 3 Wiring Methods and Materials | 305.15(C) | Conductors emerging from the ground shall be enclosed in listed raceways. Raceways installed on poles shall be of rigid metal conduit, intermediate metal conduit, RTRC-XW, Schedule 80 PVC conduit, or equivalent, extending from the minimum cover depth specified in Table 305.15(A) to a point 2.5 m (8 ft) above finished g... | https://2023.antflix.net#305.15(C) |
Chapter 3 Wiring Methods and Materials | 305.15(D) | Direct burial cables shall be permitted to be spliced or tapped without the use of splice boxes if they are installed using materials suitable for the application. The taps and splices shall be watertight and protected from mechanical damage. Where cables are shielded, the shielding shall be continuous across the splic... | https://2023.antflix.net#305.15(D) |
Chapter 3 Wiring Methods and Materials | 305.15(E) | Backfill containing large rocks, paving materials, cinders, large or sharply angular substances, or corrosive materials shall not be placed in an excavation where materials can damage or contribute to the corrosion of raceways, cables, or other substructures or where it might prevent adequate compaction of fill. Protec... | https://2023.antflix.net#305.15(E) |
Chapter 3 Wiring Methods and Materials | 305.15(F) | Where a raceway enters from an underground system, the end within the building shall be sealed with an identified compound to prevent the entrance of moisture. Informational Note: Presence of hazardous gases or vapors might also necessitate sealing of underground conduits or raceways entering buildings. [305.15(F)](htt... | https://2023.antflix.net#305.15(F) |
Chapter 3 Wiring Methods and Materials | 310.1 | This article covers general requirements for conductors rated up to and including 2000 volts and their type designations, insulations, markings, mechanical strengths, ampacity ratings, and uses. These requirements do not apply to conductors that form an integral part of equipment, such as motors, motor controllers, and... | https://2023.antflix.net#310.1 |
Chapter 3 Wiring Methods and Materials | 310.3(A) | The minimum size of conductors for voltage ratings up to and including 2000 volts shall be 14 AWG copper or 12 AWG aluminum or copper-clad aluminum, except as permitted elsewhere in this Code. [310.3(A)](https://2023.antflix.net#310.3(A)) | https://2023.antflix.net#310.3(A) |
Chapter 3 Wiring Methods and Materials | 310.3(B) | Conductors in this article shall be of copper, aluminum, or copper-clad aluminum, unless otherwise specified. Aluminum and copper-clad aluminum shall comply with the following: Solid aluminum conductors 8, 10, and 12 AWG shall be made of an AA-8000 series electrical grade aluminum alloy conductor material.Stranded alum... | https://2023.antflix.net#310.3(B) |
Chapter 3 Wiring Methods and Materials | 310.3(C) | Where installed in raceways, conductors 8 AWG and larger shall be stranded, unless specifically permitted or required elsewhere in this Code to be solid. [310.3(C)](https://2023.antflix.net#310.3(C)) | https://2023.antflix.net#310.3(C) |
Chapter 3 Wiring Methods and Materials | 310.3(D) | Conductors not specifically permitted elsewhere in this Code to be covered or bare shall be insulated. Informational Note: See 250.184 for insulation of neutral conductors of a solidly grounded high-voltage system. [310.3(D)](https://2023.antflix.net#310.3(D)) | https://2023.antflix.net#310.3(D) |
Chapter 3 Wiring Methods and Materials | 310.4 | Insulated conductors shall comply with Table 310.4(1) and Table 310.4(2). Informational Note: Thermoplastic insulation may stiffen at temperatures lower than —10°C (+14°F). Thermoplastic insulation may also be deformed at normal temperatures where subjected to pressure, such as at points of support. Table 310.4(1) Cond... | https://2023.antflix.net#310.4 |
Chapter 3 Wiring Methods and Materials | 310.6(A) | Insulated or covered grounded conductors shall be identified in accordance with 200.6. [310.6(A)](https://2023.antflix.net#310.6(A)) | https://2023.antflix.net#310.6(A) |
Chapter 3 Wiring Methods and Materials | 310.6(B) | Equipment grounding conductors shall be identified in accordance with 250.119. [310.6(B)](https://2023.antflix.net#310.6(B)) | https://2023.antflix.net#310.6(B) |
Chapter 3 Wiring Methods and Materials | 310.6(C) | Conductors that are intended for use as ungrounded conductors, whether used as a single conductor or in multiconductor cables, shall be finished to be clearly distinguishable from grounded conductors and equipment grounding conductors. Distinguishing markings shall not conflict in any manner with the surface markings r... | https://2023.antflix.net#310.6(C) |
Chapter 3 Wiring Methods and Materials | 310.8(A) | All conductors and cables shall be marked to indicate the following information, using the applicable method described in 310.8(B): The maximum rated voltage.The proper type letter or letters for the type of wire or cable as specified elsewhere in this Code.The manufacturer's name, trademark, or other distinctive marki... | https://2023.antflix.net#310.8(A) |
Chapter 3 Wiring Methods and Materials | 310.8(B)(1) | The following conductors and cables shall be durably marked on the surface: Single-conductor and multiconductor thermoset and thermoplastic-insulated wire and cableNonmetallic-sheathed cableService-entrance cableUnderground feeder and branch-circuit cableTray cableIrrigation cablePower-limited tray cableInstrumentation... | https://2023.antflix.net#310.8(B)(1) |
Chapter 3 Wiring Methods and Materials | 310.8(B)(2) | Metal-covered multiconductor cables shall employ a marker tape located within the cable and running for its complete length. Exception No. 1: Type MI cable shall not require a marker tape. Exception No. 2: Type AC cable shall not require a marker tape. Exception No. 3: The information required in 310.8(A) shall be perm... | https://2023.antflix.net#310.8(B)(2) |
Chapter 3 Wiring Methods and Materials | 310.8(B)(3) | The following conductors and cables shall be marked by means of a printed tag attached to the coil, reel, or carton: Type MI cableSwitchboard wiresMetal-covered, single-conductor cablesType AC cable [310.8(B)(3)](https://2023.antflix.net#310.8(B)(3)) | https://2023.antflix.net#310.8(B)(3) |
Chapter 3 Wiring Methods and Materials | 310.8(B)(4) | The information required in 310.8(A)(4) shall be permitted to be marked on the surface of the individual insulated conductors for the following multiconductor cables: Type MC cableTray cableIrrigation cablePower-limited tray cablePower-limited fire alarm cableInstrumentation tray cable [310.8(B)(4)](https://2023.antfli... | https://2023.antflix.net#310.8(B)(4) |
Chapter 3 Wiring Methods and Materials | 310.8(C) | A type letter or letters used alone shall indicate a single insulated conductor. The letter suffixes shall be indicated as follows: D - For two insulated conductors laid parallel within an outer nonmetallic coveringM - For an assembly of two or more insulated conductors twisted spirally within an outer nonmetallic cove... | https://2023.antflix.net#310.8(C) |
Chapter 3 Wiring Methods and Materials | 310.8(D) | All conductors and cables contained in Chapter 3 shall be permitted to be surface marked to indicate special characteristics of the cable materials. These markings include, but are not limited to, markings for limited smoke, sunlight resistant, and so forth. [310.8(D)](https://2023.antflix.net#310.8(D)) | https://2023.antflix.net#310.8(D) |
Chapter 3 Wiring Methods and Materials | 310.10 | The conductors described in 310.4 shall be permitted for use in any of the wiring methods covered in Chapter 3 and as specified in their respective tables or as permitted elsewhere in this Code. [310.10](https://2023.antflix.net#310.10) | https://2023.antflix.net#310.10 |
Chapter 3 Wiring Methods and Materials | 310.10(A) | Insulated conductors and cables used in dry locations shall be any of the types identified in this Code. [310.10(A)](https://2023.antflix.net#310.10(A)) | https://2023.antflix.net#310.10(A) |
Chapter 3 Wiring Methods and Materials | 310.10(B) | Insulated conductors and cables used in dry and damp locations shall be Types FEP, FEPB, MTW, PFA, RHH, RHW, RHW-2, SA, THHN, THW, THW-2, THHW, THWN, THWN-2, TW, XHH, XHHW, XHHW-2, XHHN, XHWN, XHWN-2, Z, or ZW. [310.10(B)](https://2023.antflix.net#310.10(B)) | https://2023.antflix.net#310.10(B) |
Chapter 3 Wiring Methods and Materials | 310.10(C) | Insulated conductors and cables used in wet locations shall comply with one of the following: Be moisture-impervious metal-sheathedBe types MTW, RHW, RHW-2, TW, THW, THW-2, THHW, THWN, THWN-2, XHHW, XHHW-2, XHWN, XHWN-2 or ZWBe of a type listed for use in wet locations [310.10(C)](https://2023.antflix.net#310.10(C)) | https://2023.antflix.net#310.10(C) |
Chapter 3 Wiring Methods and Materials | 310.10(D) | Insulated conductors or cables used where exposed to direct rays of the sun shall comply with one of the following: Conductors and cables shall be listed being sunlight resistant.Conductors and cables shall be covered with insulating material, such as tape or sleeving, that is listed as being sunlight resistant. [310.1... | https://2023.antflix.net#310.10(D) |
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