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Chapter 3 Wiring Methods and Materials | 390.15(D) | In office occupancies, approved metal flat-top raceways, if not over 100 mm (4 in.) in width, shall be permitted to be laid flush with the concrete floor surface, provided they are covered with substantial linoleum that is not less than 1.6 mm (1/16 in.) thick or with equivalent floor covering. Where more than one and ... | https://2023.antflix.net#390.15(D) |
Chapter 3 Wiring Methods and Materials | 390.20 | No conductor larger than that for which the raceway is designed shall be installed in underfloor raceways. [390.20](https://2023.antflix.net#390.20) | https://2023.antflix.net#390.20 |
Chapter 3 Wiring Methods and Materials | 390.22 | The combined cross-sectional area of all conductors or cables shall not exceed 40 percent of the interior cross-sectional area of the raceway. [390.22](https://2023.antflix.net#390.22) | https://2023.antflix.net#390.22 |
Chapter 3 Wiring Methods and Materials | 390.23 | The ampacity adjustment factors in 310.15(C) shall apply to conductors installed in underfloor raceways. [390.23](https://2023.antflix.net#390.23) | https://2023.antflix.net#390.23 |
Chapter 3 Wiring Methods and Materials | 390.56 | Splices and taps shall be made only in junction boxes. For the purposes of this section, so-called loop wiring (continuous, unbroken conductor connecting the individual outlets) shall not be considered to be a splice or tap. Exception: Splices and taps shall be permitted in trench-type flush raceway having a removable ... | https://2023.antflix.net#390.56 |
Chapter 3 Wiring Methods and Materials | 390.57 | When an outlet is abandoned, discontinued, or removed, the sections of circuit conductors supplying the outlet shall be removed from the raceway. No splices or reinsulated conductors, such as would be the case with abandoned outlets on loop wiring, shall be allowed in raceways. [390.57](https://2023.antflix.net#390.57) | https://2023.antflix.net#390.57 |
Chapter 3 Wiring Methods and Materials | 390.70 | Underfloor raceways shall be laid so that a straight line from the center of one junction box to the center of the next junction box coincides with the centerline of the raceway system. Raceways shall be firmly held in place to prevent disturbing this alignment during construction. [390.70](https://2023.antflix.net#390... | https://2023.antflix.net#390.70 |
Chapter 3 Wiring Methods and Materials | 390.71 | A suitable marker shall be installed at or near each end of each straight run of raceways to locate the last insert. [390.71](https://2023.antflix.net#390.71) | https://2023.antflix.net#390.71 |
Chapter 3 Wiring Methods and Materials | 390.73 | Dead ends of raceways shall be closed. [390.73](https://2023.antflix.net#390.73) | https://2023.antflix.net#390.73 |
Chapter 3 Wiring Methods and Materials | 390.74 | Junction boxes shall be leveled to the floor grade and sealed to prevent the free entrance of water or concrete. Junction boxes used with metal raceways shall be metal and shall be electrically continuous with the raceways. [390.74](https://2023.antflix.net#390.74) | https://2023.antflix.net#390.74 |
Chapter 3 Wiring Methods and Materials | 390.75 | Inserts shall be leveled and sealed to prevent the entrance of concrete. Inserts used with metal raceways shall be metal and shall be electrically continuous with the raceway. Inserts set in or on fiber raceways before the floor is laid shall be mechanically secured to the raceway. Inserts set in fiber raceways after t... | https://2023.antflix.net#390.75 |
Chapter 3 Wiring Methods and Materials | 390.76 | Connections from underfloor raceways to distribution centers and wall outlets shall be made by approved fittings or by any of the wiring methods in Chapter 3, where installed in accordance with the respective articles. [390.76](https://2023.antflix.net#390.76) | https://2023.antflix.net#390.76 |
Chapter 3 Wiring Methods and Materials | 392.1 | This article covers cable tray systems, including ladder, ventilated trough, ventilated channel, solid bottom, and other similar structures. Informational Note: See ANSI/NEMA-VE 1-2017, Metal Cable Tray Systems, and NECA/NEMA 105-2015, Standard for Installing Metal Cable Tray Systems, for further information on cable t... | https://2023.antflix.net#392.1 |
Chapter 3 Wiring Methods and Materials | 392.10 | Cable tray shall be permitted to be used as a support system for wiring methods containing service conductors, feeders, branch circuits, communications circuits, control circuits, and signaling circuits. Single insulated cables and single insulated conductors shall be permitted in cable tray only when installed in acco... | https://2023.antflix.net#392.10 |
Chapter 3 Wiring Methods and Materials | 392.10(A) | The wiring methods in Table 392.10(A) shall be permitted to be installed in cable tray systems under the conditions described in their respective articles and sections.
Table 392.10(A) Wiring Methods
Wiring Method
Article
Armored cable: Type AC
320
CATV cables
800 and 820
Class 2 and Class 3 cables
722 and 7... | https://2023.antflix.net#392.10(A) |
Chapter 3 Wiring Methods and Materials | 392.10(B) | The wiring methods in Table 392.10(A) shall be permitted to be used in any industrial establishment under the conditions described in their respective articles. In industrial establishments only, where conditions of maintenance and supervision ensure that only qualified persons service the installed cable tray system, ... | https://2023.antflix.net#392.10(B) |
Chapter 3 Wiring Methods and Materials | 392.10(B)(1) | Single-conductor cables and single insulated conductors shall be permitted to be installed in accordance with 392.10(B)(1)(a) through (B)(1)(c).Single-conductor cables and single insulated conductors shall be 1/0 AWG or larger and shall be of a type listed and marked on the surface for use in cable trays. Where 1/0 AWG... | https://2023.antflix.net#392.10(B)(1) |
Chapter 3 Wiring Methods and Materials | 392.10(B)(2) | Single- and multiconductor medium voltage cables shall be Type MV cable. Single conductors shall be installed in accordance with 392.10(B)(1). [392.10(B)(2)](https://2023.antflix.net#392.10(B)(2)) | https://2023.antflix.net#392.10(B)(2) |
Chapter 3 Wiring Methods and Materials | 392.10(C) | Cable trays in hazardous (classified) locations shall contain only the cable types and raceways permitted by other articles in this Code. [392.10(C)](https://2023.antflix.net#392.10(C)) | https://2023.antflix.net#392.10(C) |
Chapter 3 Wiring Methods and Materials | 392.10(D) | In addition to the uses permitted elsewhere in 392.10, nonmetallic cable tray shall be permitted in corrosive areas and in areas requiring voltage isolation. [392.10(D)](https://2023.antflix.net#392.10(D)) | https://2023.antflix.net#392.10(D) |
Chapter 3 Wiring Methods and Materials | 392.10(E) | In airports where maintenance and supervision conditions ensure that only qualified persons can access, install, or service the cable, airfield lighting cable used in series circuits that are rated up to 5000 volts and are powered by constant current regulators shall be permitted to be installed in cable trays. Informa... | https://2023.antflix.net#392.10(E) |
Chapter 3 Wiring Methods and Materials | 392.12 | Cable tray systems shall not be used in hoistways or where subject to severe physical damage. [392.12](https://2023.antflix.net#392.12) | https://2023.antflix.net#392.12 |
Chapter 3 Wiring Methods and Materials | 392.18(A) | Cable trays shall be installed as a complete system. Field bends or modifications shall be so made that the electrical continuity of the cable tray system and support for the cables is maintained. Cable tray systems shall be permitted to have mechanically discontinuous segments between cable tray runs or between cable ... | https://2023.antflix.net#392.18(A) |
Chapter 3 Wiring Methods and Materials | 392.18(B) | Each run of cable tray shall be completed before the installation of cables. [392.18(B)](https://2023.antflix.net#392.18(B)) | https://2023.antflix.net#392.18(B) |
Chapter 3 Wiring Methods and Materials | 392.18(C) | In portions of runs where additional protection is required, covers or enclosures providing the required protection shall be of a material that is compatible with the cable tray. [392.18(C)](https://2023.antflix.net#392.18(C)) | https://2023.antflix.net#392.18(C) |
Chapter 3 Wiring Methods and Materials | 392.18(D) | Cable trays shall be permitted to extend transversely through partitions and walls or vertically through platforms and floors in wet or dry locations where the installations, complete with installed cables, are made in accordance with 300.21. [392.18(D)](https://2023.antflix.net#392.18(D)) | https://2023.antflix.net#392.18(D) |
Chapter 3 Wiring Methods and Materials | 392.18(E) | Cable trays shall be exposed and accessible, except as permitted by 392.18(D). [392.18(E)](https://2023.antflix.net#392.18(E)) | https://2023.antflix.net#392.18(E) |
Chapter 3 Wiring Methods and Materials | 392.18(F) | Sufficient space shall be provided and maintained about cable trays to permit adequate access for installing and maintaining the cables. [392.18(F)](https://2023.antflix.net#392.18(F)) | https://2023.antflix.net#392.18(F) |
Chapter 3 Wiring Methods and Materials | 392.18(G) | In industrial facilities where conditions of maintenance and supervision ensure that only qualified persons service the installation and where the cable tray systems are designed and installed to support the load, such systems shall be permitted to support raceways and cables, and boxes and conduit bodies covered in 31... | https://2023.antflix.net#392.18(G) |
Chapter 3 Wiring Methods and Materials | 392.18(H) | Cable trays containing conductors operating over 600 volts shall have a permanent, legible warning notice carrying the wording "DANGER - HIGH VOLTAGE - KEEP AWAY" placed in a readily visible position on all cable trays, with the spacing of warning notices not to exceed 3 m (10 ft). The danger marking(s) or labels shall... | https://2023.antflix.net#392.18(H) |
Chapter 3 Wiring Methods and Materials | 392.20(A) | Multiconductor cables operating at 1000 volts or less shall be permitted to be installed in the same tray. [392.20(A)](https://2023.antflix.net#392.20(A)) | https://2023.antflix.net#392.20(A) |
Chapter 3 Wiring Methods and Materials | 392.20(B) | Cables operating at over 1000 volts and those operating at 1000 volts or less installed in the same cable tray shall comply with either of the following: The cables operating at over 1000 volts are Type MC.The cables operating at over 1000 volts are separated from the cables operating at 1000 volts or less by a solid f... | https://2023.antflix.net#392.20(B) |
Chapter 3 Wiring Methods and Materials | 392.20(C) | 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 im... | https://2023.antflix.net#392.20(C) |
Chapter 3 Wiring Methods and Materials | 392.20(D) | Where any of the single conductors installed in ladder or ventilated trough cable trays are 1/0 through 4/0 AWG, all single conductors shall be installed in a single layer. Conductors that are bound together to comprise each circuit group shall be permitted to be installed in other than a single layer. [392.20(D)](http... | https://2023.antflix.net#392.20(D) |
Chapter 3 Wiring Methods and Materials | 392.22(A) | The number of multiconductor cables, rated 2000 volts or less, permitted in a single cable tray shall not exceed the requirements of this section. The conductor sizes shall apply to both aluminum and copper conductors. Where dividers are used, fill calculations shall apply to each divided section of the cable tray. [39... | https://2023.antflix.net#392.22(A) |
Chapter 3 Wiring Methods and Materials | 392.22(A)(1) | Where ladder or ventilated trough cable trays contain multiconductor power or lighting cables, or any mixture of multiconductor power, lighting, control, and signal cables, the maximum number of cables shall conform to 392.22(A)(1)(a) through (A)(1)(c).
Where all of the cables are 4/0 AWG or larger, the sum of the dia... | https://2023.antflix.net#392.22(A)(1) |
Chapter 3 Wiring Methods and Materials | 392.22(A)(2) | Where a ladder or ventilated trough cable tray having a usable inside depth of 150 mm (6 in.) or less contains multiconductor control and/or signal cables only, the sum of the cross-sectional areas of all cables at any cross section shall not exceed 50 percent of the interior cross-sectional area of the cable tray. A d... | https://2023.antflix.net#392.22(A)(2) |
Chapter 3 Wiring Methods and Materials | 392.22(A)(3) | Where solid bottom cable trays contain multiconductor power or lighting cables, or any mixture of multiconductor power, lighting, control, and signal cables, the maximum number of cables shall conform to 392.22(A)(3)(a) through (A)(3)(c). Where all of the cables are 4/0 AWG or larger, the sum of the diameters of all ca... | https://2023.antflix.net#392.22(A)(3) |
Chapter 3 Wiring Methods and Materials | 392.22(A)(4) | Where a solid bottom cable tray having a usable inside depth of 150 mm (6 in.) or less contains multiconductor control and/or signal cables only, the sum of the cross sectional areas of all cables at any cross-section shall not exceed 40 percent of the interior cross-sectional area of the cable tray. A depth of 150 mm ... | https://2023.antflix.net#392.22(A)(4) |
Chapter 3 Wiring Methods and Materials | 392.22(A)(5) | Where ventilated channel cable trays contain multiconductor cables of any type, 392.22(A)(5)(a) and (A)(5)(b) shall apply. Where only one multiconductor cable is installed, the cross-sectional area shall not exceed the value specified in Column 1 of Table 392.22(A)(5).Where more than one multiconductor cable is install... | https://2023.antflix.net#392.22(A)(5) |
Chapter 3 Wiring Methods and Materials | 392.22(A)(6) | Where solid channel cable trays contain multiconductor cables of any type, 392.22(A)(6)(a) and (A)(6)(b) shall apply. Where only one multiconductor cable is installed, the cross-sectional area of the cable shall not exceed the value specified in Column 1 of Table 392.22(A)(6).Where more than one multiconductor cable is... | https://2023.antflix.net#392.22(A)(6) |
Chapter 3 Wiring Methods and Materials | 392.22(B) | The number of single conductor cables, rated 2000 volts or less, permitted in a single cable tray section shall not exceed the requirements of this section. The single conductors, or conductor assemblies, shall be evenly distributed across the cable tray. The conductor sizes shall apply to both aluminum and copper cond... | https://2023.antflix.net#392.22(B) |
Chapter 3 Wiring Methods and Materials | 392.22(B)(1) | Where ladder or ventilated trough cable trays contain single-conductor cables, the maximum number of single conductors shall conform to 392.22(B)(1)(a) through (B)(1)(d). Where all of the cables are 1000 kcmil or larger, the sum of the diameters of all single-conductor cables shall not exceed the cable tray width, and ... | https://2023.antflix.net#392.22(B)(1) |
Chapter 3 Wiring Methods and Materials | 392.22(B)(2) | Where 50 mm (2 in.), 75 mm (3 in.), 100 mm (4 in.), or 150 mm (6 in.) wide ventilated channel cable trays contain single-conductor cables, the sum of the diameters of all single conductors shall not exceed the inside width of the channel. [392.22(B)(2)](https://2023.antflix.net#392.22(B)(2)) | https://2023.antflix.net#392.22(B)(2) |
Chapter 3 Wiring Methods and Materials | 392.22(C) | The number of cables rated 2001 volts or over permitted in a single cable tray shall not exceed the requirements of this section.
The sum of the diameters of single-conductor and multiconductor cables shall not exceed the cable tray width, and the cables shall be installed in a single layer. Where single conductor cabl... | https://2023.antflix.net#392.22(C) |
Chapter 3 Wiring Methods and Materials | 392.30(A) | Cable trays shall be supported at intervals in accordance with the installation instructions. [392.30(A)](https://2023.antflix.net#392.30(A)) | https://2023.antflix.net#392.30(A) |
Chapter 3 Wiring Methods and Materials | 392.30(B) | Cables and conductors shall be secured to and supported by the cable tray system in accordance with the following, as applicable: In other than horizontal runs, the cables shall be fastened securely to transverse members of the cable tray.Supports shall be provided to prevent stress on cables where they enter raceways ... | https://2023.antflix.net#392.30(B) |
Chapter 3 Wiring Methods and Materials | 392.44 | Expansion splice plates for cable trays shall be provided where necessary to compensate for thermal expansion and contraction. [392.44](https://2023.antflix.net#392.44) | https://2023.antflix.net#392.44 |
Chapter 3 Wiring Methods and Materials | 392.46 | A box shall not be required where cables or conductors are installed in bushed conduit and tubing used for support or for protection against physical damage or where conductors or cables transition to a raceway wiring method from the cable tray. Conductors shall be permitted to enter equipment in accordance with 392.46... | https://2023.antflix.net#392.46 |
Chapter 3 Wiring Methods and Materials | 392.46(A) | Individual conductors or multiconductor cables with entirely nonmetallic sheaths shall be permitted to enter enclosures where they are terminated through nonflexible bushed conduit or tubing installed for their protection provided they are secured at the point of transition from the cable tray and the conduit or tubing... | https://2023.antflix.net#392.46(A) |
Chapter 3 Wiring Methods and Materials | 392.46(B) | Individual conductors or multiconductor cables with entirely nonmetallic sheaths shall be permitted to enter enclosures through openings associated with flanges from cable trays where the cable tray is attached to the flange and the flange is mounted directly to the equipment. The openings shall be made such that the c... | https://2023.antflix.net#392.46(B) |
Chapter 3 Wiring Methods and Materials | 392.56 | Cable splices and Type MV cable joints made and insulated by approved methods shall be permitted to be located within a cable tray, provided they are accessible. Splices and Type MV cable joints shall be permitted to project above the side rails where not subject to physical damage. [392.56](https://2023.antflix.net#39... | https://2023.antflix.net#392.56 |
Chapter 3 Wiring Methods and Materials | 392.60(A) | Metal cable trays shall be permitted to be used as equipment grounding conductors where continuous maintenance and supervision ensure that qualified persons service the installed cable tray system and the cable tray complies with this section. Metal cable trays that support electrical conductors shall be grounded as re... | https://2023.antflix.net#392.60(A) |
Chapter 3 Wiring Methods and Materials | 392.60(B) | Steel or aluminum cable tray systems shall be permitted to be used as equipment grounding conductors, provided all the following requirements are met:
The cable tray sections and fittings are identified as an equipment grounding conductor.
The minimum cross-sectional area of cable trays conform to the requirements in ... | https://2023.antflix.net#392.60(B) |
Chapter 3 Wiring Methods and Materials | 392.60(C) | Where metal cable tray systems are mechanically discontinuous, as permitted in 392.18(A), a bonding jumper sized in accordance with 250.102 shall connect the two sections of the cable tray, or the cable tray and the raceway or equipment. Bonding shall be in accordance with 250.96. [392.60(C)](https://2023.antflix.net#3... | https://2023.antflix.net#392.60(C) |
Chapter 3 Wiring Methods and Materials | 392.80(A) | Informational Note: See 110.14(C) for conductor temperature limitations due to termination provisions. [392.80(A)](https://2023.antflix.net#392.80(A)) | https://2023.antflix.net#392.80(A) |
Chapter 3 Wiring Methods and Materials | 392.80(A)(1) | The ampacity of multiconductor cables, nominally rated 2000 volts or less, installed according to the requirements of 392.22(A) shall be as given in Table 310.16 and Table 310.18, subject to 392.80(A)(1)(a), (A)(1)(b), (A)(1)(c), and 310.14(A)(2). The adjustment factors of 310.15(C)(1) shall apply only to multiconducto... | https://2023.antflix.net#392.80(A)(1) |
Chapter 3 Wiring Methods and Materials | 392.80(A)(2) | The ampacity of single-conductor cables shall be as permitted by 310.14(A)(2). The adjustment factors of 310.15(C)(1) shall not apply to the ampacity of cables in cable trays. The ampacity of single-conductor cables, or single conductors cabled together (triplexed, quadruplexed, and so forth), nominally rated 2000 volt... | https://2023.antflix.net#392.80(A)(2) |
Chapter 3 Wiring Methods and Materials | 392.80(A)(3) | Where a cable tray contains a combination of multiconductor and single-conductor cables, the ampacities shall be as given in 392.80(A)(1) for multiconductor cables and 392.80(A)(2) for single-conductor cables, provided that the following conditions apply: The sum of the multiconductor cable fill area as a percentage of... | https://2023.antflix.net#392.80(A)(3) |
Chapter 3 Wiring Methods and Materials | 392.80(B) | The ampacity of cables, rated 2001 volts, nominal, or over, installed according to 392.22(C) shall not exceed the requirements of this section. Informational Note: See 110.40 for conductor temperature limitations due to termination provisions. [392.80(B)](https://2023.antflix.net#392.80(B)) | https://2023.antflix.net#392.80(B) |
Chapter 3 Wiring Methods and Materials | 392.80(B)(1) | The ampacity of multiconductor cables shall be as given in Table 315.60(C)(9) and Table 315.60(C)(10), subject to the following: Where cable trays are continuously covered for more than 1.8 m (6 ft) with solid unventilated covers, not more than 95 percent of the ampacities of Table 315.60(C)(9) and Table 315.60(C)(10) ... | https://2023.antflix.net#392.80(B)(1) |
Chapter 3 Wiring Methods and Materials | 392.80(B)(2) | The ampacity of single-conductor cables, or single conductors cabled together (triplexed, quadruplexed, and so forth), shall comply with the following: The ampacities for 1/0 AWG and larger single-conductor cables in uncovered cable trays shall not exceed 75 percent of the ampacities in Table 315.60(C)(3) and Table 315... | https://2023.antflix.net#392.80(B)(2) |
Chapter 3 Wiring Methods and Materials | 392.100(A) | Cable trays shall have suitable strength and rigidity to provide adequate support for all contained wiring. [392.100(A)](https://2023.antflix.net#392.100(A)) | https://2023.antflix.net#392.100(A) |
Chapter 3 Wiring Methods and Materials | 392.100(B) | Cable trays shall not have sharp edges, burrs, or projections that could damage the insulation or jackets of the wiring. [392.100(B)](https://2023.antflix.net#392.100(B)) | https://2023.antflix.net#392.100(B) |
Chapter 3 Wiring Methods and Materials | 392.100(C) | Cable tray systems shall be corrosion resistant. If made of ferrous material, the system shall be protected from corrosion as required by 300.6. [392.100(C)](https://2023.antflix.net#392.100(C)) | https://2023.antflix.net#392.100(C) |
Chapter 3 Wiring Methods and Materials | 392.100(D) | Cable trays shall have side rails or equivalent structural members. [392.100(D)](https://2023.antflix.net#392.100(D)) | https://2023.antflix.net#392.100(D) |
Chapter 3 Wiring Methods and Materials | 392.100(E) | Cable trays shall include fittings or other suitable means for changes in direction and elevation of runs. [392.100(E)](https://2023.antflix.net#392.100(E)) | https://2023.antflix.net#392.100(E) |
Chapter 3 Wiring Methods and Materials | 392.100(F) | Nonmetallic cable trays shall be made of flame-retardant material. [392.100(F)](https://2023.antflix.net#392.100(F)) | https://2023.antflix.net#392.100(F) |
Chapter 3 Wiring Methods and Materials | 393.1 | This article covers the installation of low-voltage suspended ceiling power distribution systems. [393.1](https://2023.antflix.net#393.1) | https://2023.antflix.net#393.1 |
Chapter 3 Wiring Methods and Materials | 393.6 | Suspended ceiling power distribution systems and associated fittings shall be listed as in 393.6(A) or (B). [393.6](https://2023.antflix.net#393.6) | https://2023.antflix.net#393.6 |
Chapter 3 Wiring Methods and Materials | 393.6(A) | Low-voltage suspended ceiling distribution systems operating at 30 volts ac or less or 60 volts dc or less shall be listed as a complete system, with the utilization equipment, power supply, and fittings as part of the same identified system. [393.6(A)](https://2023.antflix.net#393.6(A)) | https://2023.antflix.net#393.6(A) |
Chapter 3 Wiring Methods and Materials | 393.6(B) | A low-voltage suspended ceiling power distribution system assembled from the following parts, listed according to the appropriate function, shall be permitted: Listed low-voltage utilization equipmentListed Class 2 power supplyListed or identified fittings, including connectors and grid rails with bare conductorsListed... | https://2023.antflix.net#393.6(B) |
Chapter 3 Wiring Methods and Materials | 393.10 | Low-voltage suspended ceiling power distribution systems shall be permanently connected and shall be permitted as follows: For listed utilization equipment capable of operation at a maximum of 30 volts ac (42.4 volts peak) or 60 volts dc (24.8 volts peak for dc interrupted at a rate of 10 Hz to 200 Hz) and limited to C... | https://2023.antflix.net#393.10 |
Chapter 3 Wiring Methods and Materials | 393.12 | Suspended ceiling power distribution systems shall not be installed in the following: In damp or wet locationsWhere subject to corrosive fumes or vapors, such as storage battery roomsWhere subject to physical damageIn concealed locationsIn hazardous (classified) locationsAs part of a fire-rated floor-ceiling or roof-ce... | https://2023.antflix.net#393.12 |
Chapter 3 Wiring Methods and Materials | 393.14(A) | Support wiring shall be installed in a neat and workmanlike manner. Cables and conductors installed exposed on the surface of ceilings and sidewalls shall be supported by the building structure in such a manner that the cable is not damaged by normal building use. Such cables shall be supported by straps, staples, hang... | https://2023.antflix.net#393.14(A) |
Chapter 3 Wiring Methods and Materials | 393.14(B) | Exposed insulated secondary circuit conductors shall be listed, of the type, and installed as described as follows: Class 2 cable supplied by a listed Class 2 power source and installed in accordance with Part I of Article 722 and Parts I and II of Article 725Wiring methods described in Chapter 3 [393.14(B)](https://20... | https://2023.antflix.net#393.14(B) |
Chapter 3 Wiring Methods and Materials | 393.21(A) | A disconnecting means for the Class 2 supply to the power grid system shall be located so as to be accessible and within sight of the Class 2 power source for servicing or maintenance of the grid system. [393.21(A)](https://2023.antflix.net#393.21(A)) | https://2023.antflix.net#393.21(A) |
Chapter 3 Wiring Methods and Materials | 393.21(B) | Where connected to a multiwire branch circuit, the disconnecting means shall simultaneously disconnect all the supply conductors, including the grounded conductors. [393.21(B)](https://2023.antflix.net#393.21(B)) | https://2023.antflix.net#393.21(B) |
Chapter 3 Wiring Methods and Materials | 393.30(A) | A suspended ceiling low-voltage power distribution system shall be secured to the mounting surface of the building structure by hanging wires, screws, or bolts in accordance with the installation and operation instructions. Mounting hardware, such as screws or bolts, shall be either packaged with the suspended ceiling ... | https://2023.antflix.net#393.30(A) |
Chapter 3 Wiring Methods and Materials | 393.30(B) | The individual power grid rails shall be mechanically secured to the overall ceiling grid assembly. [393.30(B)](https://2023.antflix.net#393.30(B)) | https://2023.antflix.net#393.30(B) |
Chapter 3 Wiring Methods and Materials | 393.40(A) | Connections to busbar grid rails, cables, and conductors shall be made with listed insulating devices, and these connections shall be accessible after installation. A soldered connection shall be made mechanically secure before being soldered. Other means of securing leads, such as push-on terminals and spade-type conn... | https://2023.antflix.net#393.40(A) |
Chapter 3 Wiring Methods and Materials | 393.40(B) | Where made in a wall, connections shall be installed in an enclosure in accordance with Parts I, II, and III of Article 314. [393.40(B)](https://2023.antflix.net#393.40(B)) | https://2023.antflix.net#393.40(B) |
Chapter 3 Wiring Methods and Materials | 393.45(A) | The listed Class 2 power supply or transformer primary shall be protected at not greater than 20 amperes. [393.45(A)](https://2023.antflix.net#393.45(A)) | https://2023.antflix.net#393.45(A) |
Chapter 3 Wiring Methods and Materials | 393.45(B) | Listed Class 2 sources shall not have the output connections paralleled or otherwise interconnected unless listed for such interconnection. [393.45(B)](https://2023.antflix.net#393.45(B)) | https://2023.antflix.net#393.45(B) |
Chapter 3 Wiring Methods and Materials | 393.45(C) | A suspended ceiling low-voltage power distribution system shall be permitted to have reverse polarity (backfeed) protection of dc circuits by one of the following means: If the power supply is provided as part of the system, the power supply is provided with reverse polarity (backfeed) protection; orIf the power supply... | https://2023.antflix.net#393.45(C) |
Chapter 3 Wiring Methods and Materials | 393.56 | A busbar splice shall be provided with insulation and mechanical protection equivalent to that of the grid rail busbars involved. [393.56](https://2023.antflix.net#393.56) | https://2023.antflix.net#393.56 |
Chapter 3 Wiring Methods and Materials | 393.57 | Connections in busbar grid rails, cables, and conductors shall be made with listed insulating devices and be accessible after installation. Where made in a wall, connections shall be installed in an enclosure in accordance with Parts I, II, and III of Article 314, as applicable. [393.57](https://2023.antflix.net#393.57... | https://2023.antflix.net#393.57 |
Chapter 3 Wiring Methods and Materials | 393.60 | The supply side of the Class 2 power source shall be connected to an equipment grounding conductor in accordance with the applicable requirements in Part IV of Article 250. [393.60](https://2023.antflix.net#393.60) | https://2023.antflix.net#393.60 |
Chapter 3 Wiring Methods and Materials | 393.61 | Class 2 load side circuits for suspended ceiling low-voltage power grid distribution systems shall be permitted to be grounded. [393.61](https://2023.antflix.net#393.61) | https://2023.antflix.net#393.61 |
Chapter 3 Wiring Methods and Materials | 393.100(A) | Current-carrying conductors for load side utilization equipment shall be copper and shall be 18 AWG minimum. Exception: Conductors of a size smaller than 18 AWG, but not smaller than 24 AWG, shall be permitted to be used for Class 2 circuits. Where used, these conductors shall be installed using a Chapter 3 wiring meth... | https://2023.antflix.net#393.100(A) |
Chapter 3 Wiring Methods and Materials | 393.100(B) | The power feed bus rail shall be 16 AWG minimum or equivalent. For a busbar with a circular cross section, the diameter shall be 1.29 mm (0.051 in.) minimum, and, for other than circular busbars, the area shall be 1.32 mm2 (0.002 in.2) minimum. [393.100(B)](https://2023.antflix.net#393.100(B)) | https://2023.antflix.net#393.100(B) |
Chapter 3 Wiring Methods and Materials | 394.1 | This article covers the use, installation, and construction specifications of concealed knob-and-tube wiring. [394.1](https://2023.antflix.net#394.1) | https://2023.antflix.net#394.1 |
Chapter 3 Wiring Methods and Materials | 394.10 | Concealed knob-and-tube wiring shall be permitted to be installed in the hollow spaces of walls and ceilings, or in unfinished attics and roof spaces as provided by 394.23, only as follows: For extensions of existing installationsElsewhere by special permission [394.10](https://2023.antflix.net#394.10) | https://2023.antflix.net#394.10 |
Chapter 3 Wiring Methods and Materials | 394.12 | Concealed knob-and-tube wiring shall not be used in the following: Commercial garagesTheaters and similar locationsMotion picture studiosHazardous (classified) locationsHollow spaces of walls, ceilings, and attics where such spaces are insulated by loose, rolled, or foamed-in-place insulating material that envelops the... | https://2023.antflix.net#394.12 |
Chapter 3 Wiring Methods and Materials | 394.17 | Conductors shall comply with 398.17 where passing through holes in structural members. Where passing through wood cross members in plastered partitions, conductors shall be protected by noncombustible, nonabsorbent, insulating tubes extending not less than 75 mm (3 in.) beyond the wood member. [394.17](https://2023.ant... | https://2023.antflix.net#394.17 |
Chapter 3 Wiring Methods and Materials | 394.19(A) | A clearance of not less than 75 mm (3 in.) shall be maintained between conductors and a clearance of not less than 25 mm (1 in.) between the conductor and the surface over which it passes. [394.19(A)](https://2023.antflix.net#394.19(A)) | https://2023.antflix.net#394.19(A) |
Chapter 3 Wiring Methods and Materials | 394.19(B) | Where space is too limited to provide these minimum clearances, such as at meters, panelboards, outlets, and switch points, the individual conductors shall be enclosed in flexible nonmetallic tubing, which shall be continuous in length between the last support and the enclosure or terminal point. [394.19(B)](https://20... | https://2023.antflix.net#394.19(B) |
Chapter 3 Wiring Methods and Materials | 394.19(C) | Conductors shall comply with 398.19 for clearances from other exposed conductors, piping, and so forth. [394.19(C)](https://2023.antflix.net#394.19(C)) | https://2023.antflix.net#394.19(C) |
Chapter 3 Wiring Methods and Materials | 394.23 | Conductors in unfinished attics and roof spaces shall comply with 394.23(A) or (B). Informational Note: See 310.14(A)(3) for temperature limitation of conductors. [394.23](https://2023.antflix.net#394.23) | https://2023.antflix.net#394.23 |
Chapter 3 Wiring Methods and Materials | 394.23(A) | Conductors shall be installed along the side of or through bored holes in floor joists, studs, or rafters. Where run through bored holes, conductors in the joists and in studs or rafters to a height of not less than 2.1 m (7 ft) above the floor or floor joists shall be protected by substantial running boards extending ... | https://2023.antflix.net#394.23(A) |
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