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Chapter 3 Wiring Methods and Materials | 376.100(C) | Suitable bushings, shields, or fittings having smooth, rounded edges shall be provided where conductors pass between wireways, through partitions, around bends, between wireways and cabinets or junction boxes, and at other locations where necessary to prevent abrasion of the insulation of the conductors. [376.100(C)](https://2023.antflix.net#376.100(C)) | https://2023.antflix.net#376.100(C) |
Chapter 3 Wiring Methods and Materials | 376.100(D) | Covers shall be securely fastened to the wireway. [376.100(D)](https://2023.antflix.net#376.100(D)) | https://2023.antflix.net#376.100(D) |
Chapter 3 Wiring Methods and Materials | 376.120 | Metal wireways shall be so marked that their manufacturer's name or trademark will be visible after installation. [376.120](https://2023.antflix.net#376.120) | https://2023.antflix.net#376.120 |
Chapter 3 Wiring Methods and Materials | 378.1 | This article covers the use, installation, and construction specifications for nonmetallic wireways and associated fittings. [378.1](https://2023.antflix.net#378.1) | https://2023.antflix.net#378.1 |
Chapter 3 Wiring Methods and Materials | 378.6 | Nonmetallic wireways and associated fittings shall be listed. [378.6](https://2023.antflix.net#378.6) | https://2023.antflix.net#378.6 |
Chapter 3 Wiring Methods and Materials | 378.10 | The use of nonmetallic wireways shall be permitted in the following:
Only for exposed work, except as permitted in 378.10(4).
Where subject to corrosive environments where identified for the use.
In wet locations where listed for the purpose.
Informational Note: Extreme cold may cause nonmetallic wireways to become brittle and therefore more susceptible to damage from physical contact.
As extensions to pass transversely through walls if the length passing through the wall is unbroken. Access to the conductors shall be maintained on both sides of the wall.
[378.10](https://2023.antflix.net#378.10) | https://2023.antflix.net#378.10 |
Chapter 3 Wiring Methods and Materials | 378.12 | Nonmetallic wireways shall not be used in the following: Where subject to physical damageIn any hazardous (classified) location, except as permitted by other articles in this CodeWhere exposed to sunlight unless listed and marked as suitable for the purposeWhere subject to ambient temperatures other than those for which nonmetallic wireway is listedFor conductors whose insulation temperature limitations would exceed those for which the nonmetallic wireway is listed [378.12](https://2023.antflix.net#378.12) | https://2023.antflix.net#378.12 |
Chapter 3 Wiring Methods and Materials | 378.20 | Where single conductor cables comprising each phase, neutral, or grounded conductor of an alternating-current circuit are connected in parallel as permitted in 310.10(G), the conductors shall be installed in groups consisting of not more than one conductor per phase, neutral, or grounded conductor to prevent current imbalance in the paralleled conductors due to inductive reactance. [378.20](https://2023.antflix.net#378.20) | https://2023.antflix.net#378.20 |
Chapter 3 Wiring Methods and Materials | 378.21 | No conductor larger than that for which the nonmetallic wireway is designed shall be installed in any nonmetallic wireway. [378.21](https://2023.antflix.net#378.21) | https://2023.antflix.net#378.21 |
Chapter 3 Wiring Methods and Materials | 378.22 | The sum of cross-sectional areas of all contained conductors or cables at any cross section of the nonmetallic wireway shall not exceed 20 percent of the interior cross-sectional area of the nonmetallic wireway. Conductors for signaling circuits or controller conductors between a motor and its starter and used only for starting duty shall not be considered as current-carrying conductors. The adjustment factors specified in 310.15(C)(1) shall be applicable to the current-carrying conductors up to and including the 20 percent fill specified in the first paragraph of this section. [378.22](https://2023.antflix.net#378.22) | https://2023.antflix.net#378.22 |
Chapter 3 Wiring Methods and Materials | 378.23 | Insulated conductors installed in a nonmetallic wireway shall comply with 378.23(A) and (B). [378.23](https://2023.antflix.net#378.23) | https://2023.antflix.net#378.23 |
Chapter 3 Wiring Methods and Materials | 378.23(A) | Where insulated conductors are deflected within a nonmetallic wireway, either at the ends or where conduits, fittings, or other raceways or cables enter or leave the nonmetallic wireway, or where the direction of the nonmetallic wireway is deflected greater than 30 degrees, dimensions corresponding to one wire per terminal in Table 312.6(A) shall apply. [378.23(A)](https://2023.antflix.net#378.23(A)) | https://2023.antflix.net#378.23(A) |
Chapter 3 Wiring Methods and Materials | 378.23(B) | Where insulated conductors 4 AWG or larger are pulled through a wireway, the distance between raceway and cable entries enclosing the same conductor shall not be less than that required in 314.28(A)(1) for straight pulls and in 314.28(A)(2) for angle pulls. When transposing cable size into raceway size, the minimum metric designator (trade size) raceway required for the number and size of conductors in the cable shall be used. [378.23(B)](https://2023.antflix.net#378.23(B)) | https://2023.antflix.net#378.23(B) |
Chapter 3 Wiring Methods and Materials | 378.30 | Nonmetallic wireway shall be supported in accordance with 378.30(A) and (B). [378.30](https://2023.antflix.net#378.30) | https://2023.antflix.net#378.30 |
Chapter 3 Wiring Methods and Materials | 378.30(A) | Nonmetallic wireways shall be supported where run horizontally at intervals not to exceed 900 mm (3 ft), and at each end or joint, unless listed for other support intervals. In no case shall the distance between supports exceed 3 m (10 ft). [378.30(A)](https://2023.antflix.net#378.30(A)) | https://2023.antflix.net#378.30(A) |
Chapter 3 Wiring Methods and Materials | 378.30(B) | Vertical runs of nonmetallic wireway shall be securely supported at intervals not exceeding 1.2 m (4 ft), unless listed for other support intervals, and shall not have more than one joint between supports. Adjoining nonmetallic wireway sections shall be securely fastened together to provide a rigid joint. [378.30(B)](https://2023.antflix.net#378.30(B)) | https://2023.antflix.net#378.30(B) |
Chapter 3 Wiring Methods and Materials | 378.44 | Expansion fittings for nonmetallic wireway shall be provided to compensate for thermal expansion and contraction where the length change is expected to be 6 mm (0.25 in.) or greater in a straight run. Informational Note: See Table 352.44(A) for expansion characteristics of PVC conduit. The expansion characteristics of PVC nonmetallic wireway are identical. [378.44](https://2023.antflix.net#378.44) | https://2023.antflix.net#378.44 |
Chapter 3 Wiring Methods and Materials | 378.56 | Splices and taps shall be permitted within a nonmetallic wireway, provided they are accessible. The conductors, including splices and taps, shall not fill the nonmetallic wireway to more than 75 percent of its area at that point. [378.56](https://2023.antflix.net#378.56) | https://2023.antflix.net#378.56 |
Chapter 3 Wiring Methods and Materials | 378.58 | Dead ends of nonmetallic wireway shall be closed using listed fittings. [378.58](https://2023.antflix.net#378.58) | https://2023.antflix.net#378.58 |
Chapter 3 Wiring Methods and Materials | 378.60 | Where equipment grounding is required, a separate grounding conductor shall be installed in the nonmetallic wireway. A separate equipment grounding conductor shall not be required where the grounded conductor is used to ground equipment as permitted in 250.142. [378.60](https://2023.antflix.net#378.60) | https://2023.antflix.net#378.60 |
Chapter 3 Wiring Methods and Materials | 378.70 | Extensions from nonmetallic wireway shall be made with cord pendants or any wiring method of Chapter 3. A separate equipment grounding conductor shall be installed in, or an equipment grounding connection shall be made to, any of the wiring methods used for the extension. [378.70](https://2023.antflix.net#378.70) | https://2023.antflix.net#378.70 |
Chapter 3 Wiring Methods and Materials | 378.120 | Nonmetallic wireways shall be marked so that the manufacturer's name or trademark and interior cross-sectional area in square inches shall be visible after installation. Marking for limited smoke shall be permitted on the nonmetallic wireways that have limited smoke-producing characteristics. [378.120](https://2023.antflix.net#378.120) | https://2023.antflix.net#378.120 |
Chapter 3 Wiring Methods and Materials | 380.1 | This article covers the use and installation requirements for multioutlet assemblies. Informational Note: See Article 100 for the definition of multioutlet assembly. [380.1](https://2023.antflix.net#380.1) | https://2023.antflix.net#380.1 |
Chapter 3 Wiring Methods and Materials | 380.10 | The use of a multioutlet assembly shall be permitted in dry locations. [380.10](https://2023.antflix.net#380.10) | https://2023.antflix.net#380.10 |
Chapter 3 Wiring Methods and Materials | 380.12 | A multioutlet assembly shall not be installed as follows: Where concealed, except that it shall be permissible to surround the back and sides of a metal multioutlet assembly by the building finish or recess a nonmetallic multioutlet assembly in a baseboardWhere subject to severe physical damageWhere the voltage is 300 volts or more between conductors unless the assembly is of metal having a thickness of not less than 1.02 mm (0.040 in.)Where subject to corrosive vaporsIn hoistwaysIn any hazardous (classified) location, except as permitted by other articles in this CodeWhere cord and plug connected [380.12](https://2023.antflix.net#380.12) | https://2023.antflix.net#380.12 |
Chapter 3 Wiring Methods and Materials | 380.23 | For field-assembled multioutlet assemblies, insulated conductors shall comply with 380.23(A) and (B), as applicable. [380.23](https://2023.antflix.net#380.23) | https://2023.antflix.net#380.23 |
Chapter 3 Wiring Methods and Materials | 380.23(A) | Where insulated conductors are deflected within a multioutlet assembly, either at the ends or where conduits, fittings, or other raceways or cables enter or leave the multioutlet assembly, or where the direction of the multioutlet assembly is deflected greater than 30 degrees, dimensions corresponding to one wire per terminal in Table 312.6(A) shall apply. [380.23(A)](https://2023.antflix.net#380.23(A)) | https://2023.antflix.net#380.23(A) |
Chapter 3 Wiring Methods and Materials | 380.23(B) | Where insulated conductors 4 AWG or larger are pulled through a multioutlet assembly, the distance between raceway and cable entries enclosing the same conductor shall not be less than that required by 314.28(A)(1) for straight pulls and 314.28(A)(2) for angle pulls. When transposing cable size into raceway size, the minimum metric designator (trade size) raceway required for the number and size of conductors in the cable shall be used. [380.23(B)](https://2023.antflix.net#380.23(B)) | https://2023.antflix.net#380.23(B) |
Chapter 3 Wiring Methods and Materials | 380.76 | It shall be permissible to extend a metal multioutlet assembly through (not run within) dry partitions if arrangements are made for removing the cap or cover on all exposed portions and no outlet is located within the partitions. [380.76](https://2023.antflix.net#380.76) | https://2023.antflix.net#380.76 |
Chapter 3 Wiring Methods and Materials | 382.1 | This article covers the use, installation, and construction specifications for nonmetallic extensions. [382.1](https://2023.antflix.net#382.1) | https://2023.antflix.net#382.1 |
Chapter 3 Wiring Methods and Materials | 382.6 | Concealable nonmetallic extensions and associated fittings and devices shall be listed. The starting/source tap device for the extension shall contain and provide the following protection for all load-side extensions and devices: Supplementary overcurrent protectionLevel of protection equivalent to a Class A GFCILevel of protection equivalent to a portable GFCILine and load-side miswire protectionProvide protection from the effects of arc faults [382.6](https://2023.antflix.net#382.6) | https://2023.antflix.net#382.6 |
Chapter 3 Wiring Methods and Materials | 382.10 | Nonmetallic extensions shall be permitted only in accordance with 382.10(A), (B), and (C). [382.10](https://2023.antflix.net#382.10) | https://2023.antflix.net#382.10 |
Chapter 3 Wiring Methods and Materials | 382.10(A) | The extension shall be from an existing outlet on a 15- or 20-ampere branch circuit. Where a concealable nonmetallic extension originates from a nongrounding-type receptacle, the installation shall comply with 250.130(C), 406.4(D)(2)(b), or 406.4(D)(2)(c). [382.10(A)](https://2023.antflix.net#382.10(A)) | https://2023.antflix.net#382.10(A) |
Chapter 3 Wiring Methods and Materials | 382.10(B) | The extension shall be run exposed, or concealed as permitted in 382.15, and in a dry location. [382.10(B)](https://2023.antflix.net#382.10(B)) | https://2023.antflix.net#382.10(B) |
Chapter 3 Wiring Methods and Materials | 382.10(C) | For nonmetallic surface extensions mounted directly on the surface of walls or ceilings, the building shall be occupied for residential or office purposes and shall not exceed three floors above grade. Where identified for the use, concealable nonmetallic extensions shall be permitted more than three floors above grade. Informational Note No. 1: See 310.14(A)(3) for temperature limitation of conductors. Informational Note No. 2: See 362.10 for definition of First Floor. [382.10(C)](https://2023.antflix.net#382.10(C)) | https://2023.antflix.net#382.10(C) |
Chapter 3 Wiring Methods and Materials | 382.12 | Nonmetallic extensions shall not be used as follows: In unfinished basements, attics, or roof spacesWhere the voltage between conductors exceeds 150 volts for nonmetallic surface extensions and 300 volts for aerial cableWhere subject to corrosive vaporsWhere run through a floor or partition, or outside the room in which it originates [382.12](https://2023.antflix.net#382.12) | https://2023.antflix.net#382.12 |
Chapter 3 Wiring Methods and Materials | 382.15(A) | One or more extensions shall be permitted to be run in any direction from an existing outlet, but not on the floor or within 50 mm (2 in.) from the floor. [382.15(A)](https://2023.antflix.net#382.15(A)) | https://2023.antflix.net#382.15(A) |
Chapter 3 Wiring Methods and Materials | 382.15(B) | Where identified for the use, nonmetallic extensions shall be permitted to be concealed with paint, texture, concealing compound, plaster, wallpaper, tile, wall paneling, or other similar materials and installed in accordance with 382.15(A). [382.15(B)](https://2023.antflix.net#382.15(B)) | https://2023.antflix.net#382.15(B) |
Chapter 3 Wiring Methods and Materials | 382.24(A) | A bend that reduces the normal spacing between the conductors shall be covered with a cap to protect the assembly from physical damage. [382.24(A)](https://2023.antflix.net#382.24(A)) | https://2023.antflix.net#382.24(A) |
Chapter 3 Wiring Methods and Materials | 382.24(B) | Concealable extensions shall be permitted to be folded back over themselves and flattened as required for installation. [382.24(B)](https://2023.antflix.net#382.24(B)) | https://2023.antflix.net#382.24(B) |
Chapter 3 Wiring Methods and Materials | 382.30(A) | Nonmetallic surface extensions shall be secured in place by approved means at intervals not exceeding 200 mm (8 in.), with an allowance for 300 mm (12 in.) to the first fastening where the connection to the supplying outlet is by means of an attachment plug. There shall be at least one fastening between each two adjacent outlets supplied. An extension shall be attached to only woodwork or plaster finish and shall not be in contact with any metal work or other conductive material other than with metal plates on receptacles. [382.30(A)](https://2023.antflix.net#382.30(A)) | https://2023.antflix.net#382.30(A) |
Chapter 3 Wiring Methods and Materials | 382.30(B) | All surface-mounted concealable nonmetallic extension components shall be firmly anchored to the wall or ceiling using an adhesive or mechanical anchoring system identified for this use. [382.30(B)](https://2023.antflix.net#382.30(B)) | https://2023.antflix.net#382.30(B) |
Chapter 3 Wiring Methods and Materials | 382.40 | Each run shall terminate in a fitting, connector, or box that covers the end of the assembly. All fittings, connectors, and devices shall be of a type identified for the use. [382.40](https://2023.antflix.net#382.40) | https://2023.antflix.net#382.40 |
Chapter 3 Wiring Methods and Materials | 382.42(A) | All receptacles, receptacle housings, and self-contained devices used with concealable nonmetallic extensions shall be identified for this use. [382.42(A)](https://2023.antflix.net#382.42(A)) | https://2023.antflix.net#382.42(A) |
Chapter 3 Wiring Methods and Materials | 382.42(B) | Receptacle housings and self-contained devices designed either for surface or for recessed mounting shall be permitted for use with concealable nonmetallic extensions. Receptacle housings and self-contained devices shall incorporate means for facilitating entry and termination of concealable nonmetallic extensions and for electrically connecting the housing or device. Receptacle and self-contained devices shall comply with 406.4. Power and communications outlets installed together in common housing shall be permitted in accordance with 800.133(A)(3), Exception No. 2. [382.42(B)](https://2023.antflix.net#382.42(B)) | https://2023.antflix.net#382.42(B) |
Chapter 3 Wiring Methods and Materials | 382.56 | Extensions shall consist of a continuous unbroken length of the assembly, without splices, and without exposed conductors between fittings, connectors, or devices. Taps shall be permitted where approved fittings completely covering the tap connections are used. Aerial cable and its tap connectors shall be provided with an approved means for polarization. Receptacle-type tap connectors shall be of the locking type. [382.56](https://2023.antflix.net#382.56) | https://2023.antflix.net#382.56 |
Chapter 3 Wiring Methods and Materials | 382.100 | Concealable nonmetallic extensions shall be of a multilayer flat conductor design consisting of a center ungrounded conductor enclosed by a sectioned grounded conductor and an overall sectioned equipment grounding conductor. [382.100](https://2023.antflix.net#382.100) | https://2023.antflix.net#382.100 |
Chapter 3 Wiring Methods and Materials | 382.104 | Concealable nonmetallic extensions shall be constructed, using flat copper conductors equivalent to 14 AWG or 12 AWG conductor sizes, and constructed per 382.104(A), (B), and (C). [382.104](https://2023.antflix.net#382.104) | https://2023.antflix.net#382.104 |
Chapter 3 Wiring Methods and Materials | 382.104(A) | The ungrounded conductor shall consist of one or more ungrounded flat conductor(s) enclosed in accordance with 382.104(B) and (C) and identified in accordance with 310.6(C). [382.104(A)](https://2023.antflix.net#382.104(A)) | https://2023.antflix.net#382.104(A) |
Chapter 3 Wiring Methods and Materials | 382.104(B) | The grounded conductor shall consist of two sectioned inner flat conductors that enclose the center ungrounded conductor(s). The sectioned grounded conductor shall be enclosed by the sectioned equipment grounding conductor and identified in accordance with 200.6. [382.104(B)](https://2023.antflix.net#382.104(B)) | https://2023.antflix.net#382.104(B) |
Chapter 3 Wiring Methods and Materials | 382.104(C) | The equipment grounding conductor shall consist of two overall sectioned conductors that enclose the grounded conductor and ungrounded conductor(s) and shall comply with 250.4(A)(5). The equipment grounding conductor layers shall be identified by any one of the following methods: As permitted in 250.119A clear coveringOne or more continuous green stripes or hash marksThe term "Equipment Grounding Conductor" printed at regular intervals throughout the cable [382.104(C)](https://2023.antflix.net#382.104(C)) | https://2023.antflix.net#382.104(C) |
Chapter 3 Wiring Methods and Materials | 382.112 | The ungrounded and grounded flat conductor layers shall be individually insulated and comply with 310.14(A)(3). The equipment grounding conductor shall be covered or insulated. [382.112](https://2023.antflix.net#382.112) | https://2023.antflix.net#382.112 |
Chapter 3 Wiring Methods and Materials | 382.120(A) | Concealable nonmetallic extensions shall be clearly and durably marked on both sides at intervals of not more than 610 mm (24 in.) with the information required by 310.8(A) and with the following additional information: Material of conductorsMaximum temperature ratingAmpacity [382.120(A)](https://2023.antflix.net#382.120(A)) | https://2023.antflix.net#382.120(A) |
Chapter 3 Wiring Methods and Materials | 382.120(B) | Conductors shall be clearly and durably identified on both sides throughout their length as specified in 382.104. [382.120(B)](https://2023.antflix.net#382.120(B)) | https://2023.antflix.net#382.120(B) |
Chapter 3 Wiring Methods and Materials | 384.1 | This article covers the use, installation, and construction specifications of strut-type channel raceway. [384.1](https://2023.antflix.net#384.1) | https://2023.antflix.net#384.1 |
Chapter 3 Wiring Methods and Materials | 384.6 | Strut-type channel raceways and accessories shall be listed and identified for such use. [384.6](https://2023.antflix.net#384.6) | https://2023.antflix.net#384.6 |
Chapter 3 Wiring Methods and Materials | 384.10 | The use of strut-type channel raceways shall be permitted in the following: Where exposed.In dry locations.In locations subject to corrosive vapors where protected by finishes approved for the condition.As power poles.In hazardous (classified) locations as permitted in Chapter 5.As extensions of unbroken lengths through walls, partitions, and floors where closure strips are removable from either side and the portion within the wall, partition, or floor remains covered.Ferrous channel raceways and fittings protected from corrosion solely by enamel shall be permitted only indoors. [384.10](https://2023.antflix.net#384.10) | https://2023.antflix.net#384.10 |
Chapter 3 Wiring Methods and Materials | 384.12 | Strut-type channel raceways shall not be used as follows: Where concealed.Ferrous channel raceways and fittings protected from corrosion solely by enamel shall not be permitted where subject to severe corrosive influences. [384.12](https://2023.antflix.net#384.12) | https://2023.antflix.net#384.12 |
Chapter 3 Wiring Methods and Materials | 384.21 | No conductor larger than that for which the raceway is listed shall be installed in strut-type channel raceways. [384.21](https://2023.antflix.net#384.21) | https://2023.antflix.net#384.21 |
Chapter 3 Wiring Methods and Materials | 384.22 | The number of conductors or cables permitted in strut-type channel raceways shall not exceed the percentage fill using Table 384.22 and applicable cross-sectional area of specific types and sizes of wire given in the tables in Chapter 9. The adjustment factors of 310.15(C)(1) shall not apply to conductors installed in strut-type channel raceways where all of the following conditions are met:The cross-sectional area of the raceway exceeds 2500 mm2 (4 in.2).The current-carrying conductors do not exceed 30 in number.The sum of the cross-sectional areas of all contained conductors does not exceed 20 percent of the interior cross-sectional area of the strut-type channel raceways.Table 384.22 Channel Size and Inside Cross-Sectional Area Size Channel Area 40% Area* 25% Area† in.2 mm2 in.2 mm2 in.2 mm2 15/8 × 15/16 0.887 572 0.355 229 0.222 143 15/8 × 1 1.151 743 0.460 297 0.288 186 15/8 × 13/8 1.677 1076 0.671 433 0.419 270 15/8 × 15/8 2.028 1308 0.811 523 0.507 327 15/8 × 27/16 3.169 2045 1.267 817 0.792 511 15/8 × 31/4 4.308 2780 1.723 1112 1.077 695 11/2 × 3/4 0.849 548 0.340 219 0.212 137 11/2 × 11/2 1.828 1179 0.731 472 0.457 295 11/2 × 17/8 2.301 1485 0.920 594 0.575 371 11/2 × 3 3.854 2487 1.542 995 0.964 622 *Raceways with external joiners shall use a 40 percent wire fill calculation to determine the number of conductors permitted.†Raceways with internal joiners shall use a 25 percent wire fill calculation to determine the number of conductors permitted. [384.22](https://2023.antflix.net#384.22) | https://2023.antflix.net#384.22 |
Chapter 3 Wiring Methods and Materials | 384.30(A) | A surface mount strut-type channel raceway shall be secured to the mounting surface with retention straps external to the channel at intervals not exceeding 3 m (10 ft) and within 900 mm (3 ft) of each outlet box, cabinet, junction box, or other channel raceway termination. [384.30(A)](https://2023.antflix.net#384.30(A)) | https://2023.antflix.net#384.30(A) |
Chapter 3 Wiring Methods and Materials | 384.30(B) | Strut-type channel raceways shall be permitted to be suspension mounted in air with identified methods at intervals not to exceed 3 m (10 ft) and within 900 mm (3 ft) of channel raceway terminations and ends. [384.30(B)](https://2023.antflix.net#384.30(B)) | https://2023.antflix.net#384.30(B) |
Chapter 3 Wiring Methods and Materials | 384.56 | Splices and taps shall be permitted in raceways that are accessible after installation by having a removable cover. The conductors, including splices and taps, shall not fill the raceway to more than 75 percent of its area at that point. All splices and taps shall be made by approved methods. [384.56](https://2023.antflix.net#384.56) | https://2023.antflix.net#384.56 |
Chapter 3 Wiring Methods and Materials | 384.60 | Strut-type channel raceway enclosures providing a transition to or from other wiring methods shall have a means for connecting an equipment grounding conductor. Strut-type channel raceways shall be permitted as an equipment grounding conductor in accordance with 250.118(A)(13). Where a snap-fit metal cover for strut-type channel raceways is used to achieve electrical continuity in accordance with the listing, this cover shall not be permitted as the means for providing electrical continuity for a receptacle mounted in the cover. [384.60](https://2023.antflix.net#384.60) | https://2023.antflix.net#384.60 |
Chapter 3 Wiring Methods and Materials | 384.100 | Strut-type channel raceways and their accessories shall be of a construction that distinguishes them from other raceways. Raceways and their elbows, couplings, and other fittings shall be designed such that the sections can be electrically and mechanically coupled together and installed without subjecting the wires to abrasion. They shall comply with 384.100(A), (B), and (C). [384.100](https://2023.antflix.net#384.100) | https://2023.antflix.net#384.100 |
Chapter 3 Wiring Methods and Materials | 384.100(A) | Raceways and accessories shall be formed of steel, stainless steel, or aluminum. [384.100(A)](https://2023.antflix.net#384.100(A)) | https://2023.antflix.net#384.100(A) |
Chapter 3 Wiring Methods and Materials | 384.100(B) | Steel raceways and accessories shall be protected against corrosion by galvanizing or by an organic coating. Informational Note: Enamel and PVC coatings are examples of organic coatings that provide corrosion protection. [384.100(B)](https://2023.antflix.net#384.100(B)) | https://2023.antflix.net#384.100(B) |
Chapter 3 Wiring Methods and Materials | 384.100(C) | Covers of strut-type channel raceways shall be either metal or nonmetallic. [384.100(C)](https://2023.antflix.net#384.100(C)) | https://2023.antflix.net#384.100(C) |
Chapter 3 Wiring Methods and Materials | 384.120 | Each length of strut-type channel raceway shall be clearly and durably identified as required in the first sentence of 110.21 (A). [384.120](https://2023.antflix.net#384.120) | https://2023.antflix.net#384.120 |
Chapter 3 Wiring Methods and Materials | 386.1 | This article covers the use, installation, and construction specifications for surface metal raceways and associated fittings. [386.1](https://2023.antflix.net#386.1) | https://2023.antflix.net#386.1 |
Chapter 3 Wiring Methods and Materials | 386.6 | Surface metal raceway and associated fittings shall be listed. [386.6](https://2023.antflix.net#386.6) | https://2023.antflix.net#386.6 |
Chapter 3 Wiring Methods and Materials | 386.10 | The use of surface metal raceways shall be permitted in the following: In dry locations.In Class I, Division 2 hazardous (classified) locations as permitted in 501.10(B)(3).Under raised floors, as permitted in 645.5(E)(2).Extension through walls and floors. Surface metal raceway shall be permitted to pass transversely through dry walls, dry partitions, and dry floors if the length passing through is unbroken. Access to the conductors shall be maintained on both sides of the wall, partition, or floor. [386.10](https://2023.antflix.net#386.10) | https://2023.antflix.net#386.10 |
Chapter 3 Wiring Methods and Materials | 386.12 | Surface metal raceways shall not be used in the following: Where subject to severe physical damage, unless otherwise approvedWhere the voltage is 300 volts or more between conductors, unless the metal has a thickness of not less than 1.02 mm (0.040 in.) nominalWhere subject to corrosive vaporsIn hoistwaysWhere concealed, except as permitted in 386.10 [386.12](https://2023.antflix.net#386.12) | https://2023.antflix.net#386.12 |
Chapter 3 Wiring Methods and Materials | 386.21 | No conductor larger than that for which the raceway is designed shall be installed in surface metal raceway. [386.21](https://2023.antflix.net#386.21) | https://2023.antflix.net#386.21 |
Chapter 3 Wiring Methods and Materials | 386.22 | The number of conductors or cables installed in surface metal raceway shall not be greater than the number for which the raceway is designed. Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles. The adjustment factors of 310.15(C)(1) shall not apply to conductors installed in surface metal raceways where all of the following conditions are met:The cross-sectional area of the raceway exceeds 2500 mm2 (4 in.2).The current-carrying conductors do not exceed 30 in number.The sum of the cross-sectional areas of all contained conductors does not exceed 20 percent of the interior cross-sectional area of the surface metal raceway. [386.22](https://2023.antflix.net#386.22) | https://2023.antflix.net#386.22 |
Chapter 3 Wiring Methods and Materials | 386.30 | Surface metal raceways and associated fittings shall be supported in accordance with the manufacturer's installation instructions. [386.30](https://2023.antflix.net#386.30) | https://2023.antflix.net#386.30 |
Chapter 3 Wiring Methods and Materials | 386.56 | Splices and taps shall be permitted in surface metal raceways having a removable cover that is accessible after installation. The conductors, including splices and taps, shall not fill the raceway to more than 75 percent of its area at that point. Splices and taps in surface metal raceways without removable covers shall be made only in boxes. All splices and taps shall be made by approved methods. Taps of Type FC cable installed in surface metal raceway shall be made in accordance with 322.56(B). [386.56](https://2023.antflix.net#386.56) | https://2023.antflix.net#386.56 |
Chapter 3 Wiring Methods and Materials | 386.60 | Surface metal raceway enclosures providing a transition from other wiring methods shall have a means for connecting an equipment grounding conductor. [386.60](https://2023.antflix.net#386.60) | https://2023.antflix.net#386.60 |
Chapter 3 Wiring Methods and Materials | 386.70 | When combination surface metal raceways are used for both signaling and for lighting and power circuits, the different systems shall be run in separate compartments identified by stamping, imprinting, or color coding of the interior finish. [386.70](https://2023.antflix.net#386.70) | https://2023.antflix.net#386.70 |
Chapter 3 Wiring Methods and Materials | 386.100 | Surface metal raceways shall be of such construction as will distinguish them from other raceways. Surface metal raceways and their elbows, couplings, and similar fittings shall be designed so that the sections can be electrically and mechanically coupled together and installed without subjecting the wires to abrasion. Where covers and accessories of nonmetallic materials are used on surface metal raceways, they shall be identified for such use. [386.100](https://2023.antflix.net#386.100) | https://2023.antflix.net#386.100 |
Chapter 3 Wiring Methods and Materials | 386.120 | Each length of surface metal raceway shall be clearly and durably identified as required in the first sentence of 110.21(A). [386.120](https://2023.antflix.net#386.120) | https://2023.antflix.net#386.120 |
Chapter 3 Wiring Methods and Materials | 388.1 | This article covers the use, installation, and construction specifications for surface nonmetallic raceways and associated fittings. [388.1](https://2023.antflix.net#388.1) | https://2023.antflix.net#388.1 |
Chapter 3 Wiring Methods and Materials | 388.6 | Surface nonmetallic raceway and associated fittings shall be listed. [388.6](https://2023.antflix.net#388.6) | https://2023.antflix.net#388.6 |
Chapter 3 Wiring Methods and Materials | 388.10 | Surface nonmetallic raceways shall be permitted as follows: The use of surface nonmetallic raceways shall be permitted in dry locations.Extension through walls and floors shall be permitted. Surface nonmetallic raceway shall be permitted to pass transversely through dry walls, dry partitions, and dry floors if the length passing through is unbroken. Access to the conductors shall be maintained on both sides of the wall, partition, or floor. [388.10](https://2023.antflix.net#388.10) | https://2023.antflix.net#388.10 |
Chapter 3 Wiring Methods and Materials | 388.12 | Surface nonmetallic raceways shall not be used in the following: Where concealed, except as permitted in 388.10(2)Where subject to severe physical damageWhere the voltage is 300 volts or more between conductors, unless listed for higher voltageIn hoistwaysIn any hazardous (classified) location, except as permitted by other articles in this CodeWhere subject to ambient temperatures exceeding those for which the nonmetallic raceway is listedFor conductors whose insulation temperature limitations would exceed those for which the nonmetallic raceway is listed [388.12](https://2023.antflix.net#388.12) | https://2023.antflix.net#388.12 |
Chapter 3 Wiring Methods and Materials | 388.21 | No conductor larger than that for which the raceway is designed shall be installed in surface nonmetallic raceway. [388.21](https://2023.antflix.net#388.21) | https://2023.antflix.net#388.21 |
Chapter 3 Wiring Methods and Materials | 388.22 | The number of conductors or cables installed in surface nonmetallic raceway shall not be greater than the number for which the raceway is designed. Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles. [388.22](https://2023.antflix.net#388.22) | https://2023.antflix.net#388.22 |
Chapter 3 Wiring Methods and Materials | 388.30 | Surface nonmetallic raceways and associated fittings shall be supported in accordance with the manufacturer's installation instructions. [388.30](https://2023.antflix.net#388.30) | https://2023.antflix.net#388.30 |
Chapter 3 Wiring Methods and Materials | 388.56 | Splices and taps shall be permitted in surface nonmetallic raceways having a cover capable of being opened in place that is accessible after installation. The conductors, including splices and taps, shall not fill the raceway to more than 75 percent of its area at that point. Splices and taps in surface nonmetallic raceways without covers capable of being opened in place shall be made only in boxes. All splices and taps shall be made by approved methods. [388.56](https://2023.antflix.net#388.56) | https://2023.antflix.net#388.56 |
Chapter 3 Wiring Methods and Materials | 388.60 | Where equipment grounding is required, a separate grounding conductor shall be installed in the raceway. [388.60](https://2023.antflix.net#388.60) | https://2023.antflix.net#388.60 |
Chapter 3 Wiring Methods and Materials | 388.70 | When combination surface nonmetallic raceways are used both for signaling and for lighting and power circuits, the different systems shall be run in separate compartments identified by stamping, imprinting, or color coding of the interior finish. [388.70](https://2023.antflix.net#388.70) | https://2023.antflix.net#388.70 |
Chapter 3 Wiring Methods and Materials | 388.100 | Surface nonmetallic raceways shall be of such construction as will distinguish them from other raceways. Surface nonmetallic raceways and their elbows, couplings, and similar fittings shall be designed so that the sections can be mechanically coupled together and installed without subjecting the wires to abrasion. Surface nonmetallic raceways and fittings are made of suitable nonmetallic material that is resistant to moisture and chemical atmospheres. It shall also be flame retardant, resistant to impact and crushing, resistant to distortion from heat under conditions likely to be encountered in service, and resistant to low-temperature effects. [388.100](https://2023.antflix.net#388.100) | https://2023.antflix.net#388.100 |
Chapter 3 Wiring Methods and Materials | 388.120 | Surface nonmetallic raceways that have limited smoke-producing characteristics shall be permitted to be so identified. Each length of surface nonmetallic raceway shall be clearly and durably identified as required in the first sentence of 110.21(A). [388.120](https://2023.antflix.net#388.120) | https://2023.antflix.net#388.120 |
Chapter 3 Wiring Methods and Materials | 390.1 | This article covers the use and installation requirements for underfloor raceways. [390.1](https://2023.antflix.net#390.1) | https://2023.antflix.net#390.1 |
Chapter 3 Wiring Methods and Materials | 390.10 | The installation of underfloor raceways shall be permitted beneath the surface of concrete or other flooring material or in office occupancies where laid flush with the concrete floor and covered with linoleum or equivalent floor covering. [390.10](https://2023.antflix.net#390.10) | https://2023.antflix.net#390.10 |
Chapter 3 Wiring Methods and Materials | 390.12 | Underfloor raceways shall not be installed (1) where subject to corrosive vapors or (2) in any hazardous (classified) locations, except as permitted by 504.20 and in Class I, Division 2 locations as permitted in 501.10(B)(3). Unless made of a material approved for the condition or unless corrosion protection approved for the condition is provided, metal underfloor raceways, junction boxes, and fittings shall not be installed in concrete or in areas subject to severe corrosive influences. [390.12](https://2023.antflix.net#390.12) | https://2023.antflix.net#390.12 |
Chapter 3 Wiring Methods and Materials | 390.15 | Raceway coverings shall comply with 390.15(A) through (D). [390.15](https://2023.antflix.net#390.15) | https://2023.antflix.net#390.15 |
Chapter 3 Wiring Methods and Materials | 390.15(A) | Half-round and flat-top raceways not over 100 mm (4 in.) in width shall have not less than 20 mm (3/4 in.) of concrete or wood above the raceway. Exception: As permitted in 390.15(C) and (D) for flat-top raceways. [390.15(A)](https://2023.antflix.net#390.15(A)) | https://2023.antflix.net#390.15(A) |
Chapter 3 Wiring Methods and Materials | 390.15(B) | Flat-top raceways over 100 mm (4 in.) but not over 200 mm (8 in.) wide with a minimum of 25 mm (1 in.) spacing between raceways shall be covered with concrete to a depth of not less than 25 mm (1 in.). Raceways spaced less than 25 mm (1 in.) apart shall be covered with concrete to a depth of 38 mm (11/2 in.). [390.15(B)](https://2023.antflix.net#390.15(B)) | https://2023.antflix.net#390.15(B) |
Chapter 3 Wiring Methods and Materials | 390.15(C) | Trench-type flush raceways with removable covers shall be permitted to be laid flush with the floor surface. Such approved raceways shall be designed so that the cover plates provide adequate mechanical protection and rigidity equivalent to junction box covers. [390.15(C)](https://2023.antflix.net#390.15(C)) | https://2023.antflix.net#390.15(C) |
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