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Chapter 3 Wiring Methods and Materials
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369.120
|
All IBP shall be marked to indicate the following information: The maximum rated voltage phase-to-phase or phase-to-groundThe maximum rated ampacityThe manufacturer's name, trademark, or other distinctive marking by which the organization responsible for the product can be readily identifiedThe equivalent AWG size or circular mil area of the conductorThe maximum rated conductor temperatureThe rated peak withstand current rating in rms symmetrical amperes or kAEnclosure type designation, if other than Type 1Rated short-time withstand current and duration if greater than 2 seconds [369.120](https://2023.antflix.net#369.120)
|
https://2023.antflix.net#369.120
|
Chapter 3 Wiring Methods and Materials
|
370.1
|
This article covers the use and installation requirements of cablebus and associated fittings. [370.1](https://2023.antflix.net#370.1)
|
https://2023.antflix.net#370.1
|
Chapter 3 Wiring Methods and Materials
|
370.10
|
Cablebus shall be permitted as follows: At any voltage or current for which spaced conductors are rated and where installed only for exposed work, except as permitted in 370.18For branch circuits, feeders, and servicesTo be installed indoors, outdoors, or in corrosive, wet, or damp locations where identified for the use [370.10](https://2023.antflix.net#370.10)
|
https://2023.antflix.net#370.10
|
Chapter 3 Wiring Methods and Materials
|
370.12
|
Cablebus shall not be permitted to be installed in the following: HoistwaysHazardous (classified) locations, unless specifically permitted in Chapter 5 [370.12](https://2023.antflix.net#370.12)
|
https://2023.antflix.net#370.12
|
Chapter 3 Wiring Methods and Materials
|
370.18
|
Cablebus shall be permitted to extend transversely through partitions and walls or vertically through platforms and floors in wet or dry locations where the installation, complete with the installed cables, is made in accordance with 300.21. [370.18](https://2023.antflix.net#370.18)
|
https://2023.antflix.net#370.18
|
Chapter 3 Wiring Methods and Materials
|
370.20(A)
|
The current-carrying conductors in cablebus shall comply with the following: Have an insulation rating of 75°C (167°F) or higher and be of an approved type suitable for the applicationBe sized in accordance with the design of the cablebus but in no case be smaller than 1/0 [370.20(A)](https://2023.antflix.net#370.20(A))
|
https://2023.antflix.net#370.20(A)
|
Chapter 3 Wiring Methods and Materials
|
370.20(B)
|
Approved terminating means shall be used for connections to cablebus conductors. Informational Note No. 1: See 110.14(C) for conductor temperature limitations due to termination provisions for installations up to and including 2000 volts. Informational Note No. 2: See 110.40 for conductor temperature limitations due to termination provisions for installations 2001 volts to 35,000 volts. [370.20(B)](https://2023.antflix.net#370.20(B))
|
https://2023.antflix.net#370.20(B)
|
Chapter 3 Wiring Methods and Materials
|
370.22
|
The number of conductors shall be that for which the cablebus is designed. [370.22](https://2023.antflix.net#370.22)
|
https://2023.antflix.net#370.22
|
Chapter 3 Wiring Methods and Materials
|
370.23
|
Cablebus shall be protected against overcurrent in accordance with the ampacity of the cablebus conductors in accordance with 240.4. Exception: Overcurrent protection shall be permitted in accordance with 245.26 and 245.27. [370.23](https://2023.antflix.net#370.23)
|
https://2023.antflix.net#370.23
|
Chapter 3 Wiring Methods and Materials
|
370.30(A)
|
Cablebus shall be securely supported at intervals not exceeding 3.7 m (12 ft). Where spans longer than 3.7 m (12 ft) are required, the structure shall be specifically designed for the required span length. [370.30(A)](https://2023.antflix.net#370.30(A))
|
https://2023.antflix.net#370.30(A)
|
Chapter 3 Wiring Methods and Materials
|
370.30(B)
|
The insulated conductors shall be supported on blocks or other identified mounting means. The individual conductors in a cablebus shall be supported at intervals not greater than 900 mm (3 ft) for horizontal runs and 450 mm (11/2 ft) for vertical runs. Vertical and horizontal spacing between supported conductors shall be not less than one conductor diameter at the points of support. [370.30(B)](https://2023.antflix.net#370.30(B))
|
https://2023.antflix.net#370.30(B)
|
Chapter 3 Wiring Methods and Materials
|
370.42
|
A cablebus system shall include fittings for the following: Changes in horizontal or vertical direction of the runTerminations in or on connected apparatus or equipment or the enclosures for such equipmentAdditional physical protection where required, such as guards where subject to severe physical damage [370.42](https://2023.antflix.net#370.42)
|
https://2023.antflix.net#370.42
|
Chapter 3 Wiring Methods and Materials
|
370.60
|
A cablebus system shall be grounded and/or bonded as applicable: Cablebus framework, where bonded, shall be permitted to be used as the equipment grounding conductor for branch circuits and feeders.A cablebus installation shall be grounded and bonded in accordance with Part V and Part VI of Article 250, excluding 250.86. Exception No. 2. [370.60](https://2023.antflix.net#370.60)
|
https://2023.antflix.net#370.60
|
Chapter 3 Wiring Methods and Materials
|
370.80
|
The ampacity of conductors in cablebus shall be in accordance with 310.17 and 310.19 for installations up to and including 2000 volts, or with Table 315.60(C)(3) and Table 315.60(C)(4) for installations 2001 volts to 35,000 volts. [370.80](https://2023.antflix.net#370.80)
|
https://2023.antflix.net#370.80
|
Chapter 3 Wiring Methods and Materials
|
370.120(A)
|
Each cablebus system shall include a nameplate at each terminating end of the system with the manufacturer's name or trade designation and the maximum diameter, number, voltage rating, and ampacity of the conductors to be installed. Nameplates shall be visible after installation. [370.120(A)](https://2023.antflix.net#370.120(A))
|
https://2023.antflix.net#370.120(A)
|
Chapter 3 Wiring Methods and Materials
|
370.120(B)
|
Each section and fitting of a cablebus system shall be identified with a marking that corresponds to the manufacturer's installation instructions. [370.120(B)](https://2023.antflix.net#370.120(B))
|
https://2023.antflix.net#370.120(B)
|
Chapter 3 Wiring Methods and Materials
|
371.1
|
This article covers the use and installation requirements of flexible bus systems and associated fittings. [371.1](https://2023.antflix.net#371.1)
|
https://2023.antflix.net#371.1
|
Chapter 3 Wiring Methods and Materials
|
371.6
|
Flexible bus systems shall be listed. [371.6](https://2023.antflix.net#371.6)
|
https://2023.antflix.net#371.6
|
Chapter 3 Wiring Methods and Materials
|
371.10
|
Flexible bus systems shall be permitted for the following: Services, feeders, and branch circuitsIndoorsOutdoors where identified for outdoor useInstalled in corrosive, wet, or damp locations where identified for useExposedBehind access panels where the space behind the access panel is not used for air-handling purposesTo penetrate through walls and floors in accordance with 371.18 [371.10](https://2023.antflix.net#371.10)
|
https://2023.antflix.net#371.10
|
Chapter 3 Wiring Methods and Materials
|
371.12
|
Flexible bus systems shall not be permitted to be installed in the following: HoistwaysWhere exposed to severe physical damageHazardous (classified) locations, unless specifically permitted in Chapter 5Air-handling spaces [371.12](https://2023.antflix.net#371.12)
|
https://2023.antflix.net#371.12
|
Chapter 3 Wiring Methods and Materials
|
371.14
|
Flexible bus systems shall be designed and specified for specific installation site applications by a qualified engineer within the limits of the listing and manufacturer's installation instructions. All documentation shall be available to the authority having jurisdiction. [371.14](https://2023.antflix.net#371.14)
|
https://2023.antflix.net#371.14
|
Chapter 3 Wiring Methods and Materials
|
371.17
|
Overcurrent protection shall be provided in accordance with 371.17(A) through (G). [371.17](https://2023.antflix.net#371.17)
|
https://2023.antflix.net#371.17
|
Chapter 3 Wiring Methods and Materials
|
371.17(A)
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Flexible bus systems installed for services shall be protected against overcurrent in accordance with 230.90. [371.17(A)](https://2023.antflix.net#371.17(A))
|
https://2023.antflix.net#371.17(A)
|
Chapter 3 Wiring Methods and Materials
|
371.17(B)
|
Flexible bus systems installed as feeders shall be protected against overcurrent in accordance with 215.3. Exception: The applicable requirements of 240.4 shall be permitted. [371.17(B)](https://2023.antflix.net#371.17(B))
|
https://2023.antflix.net#371.17(B)
|
Chapter 3 Wiring Methods and Materials
|
371.17(C)
|
Flexible bus systems installed as branch circuits shall be protected against overcurrent in accordance with 210.20. Exception: The applicable requirements of 240.4 shall be permitted. [371.17(C)](https://2023.antflix.net#371.17(C))
|
https://2023.antflix.net#371.17(C)
|
Chapter 3 Wiring Methods and Materials
|
371.17(D)
|
Flexible bus systems installed on a transformer secondary to the disconnect and overcurrent protection device shall be protected from overcurrent in accordance with 240.21 (C). [371.17(D)](https://2023.antflix.net#371.17(D))
|
https://2023.antflix.net#371.17(D)
|
Chapter 3 Wiring Methods and Materials
|
371.17(E)
|
Flexible bus systems installed from generator terminals that meet the size requirement in 445.13 shall be permitted to be protected against overload by the generator overload protective device(s) required by 445.12. [371.17(E)](https://2023.antflix.net#371.17(E))
|
https://2023.antflix.net#371.17(E)
|
Chapter 3 Wiring Methods and Materials
|
371.17(F)
|
Flexible bus systems installed for battery systems shall be protected from overcurrent in accordance with 240.21 (H). [371.17(F)](https://2023.antflix.net#371.17(F))
|
https://2023.antflix.net#371.17(F)
|
Chapter 3 Wiring Methods and Materials
|
371.17(G)
|
Overcurrent protection shall be required at the point where flexible bus systems are reduced in size. Exception: For industrial establishments only, omission of overcurrent protection shall be permitted at points where a flexible bus system is reduced in size, provided that the length of the flexible bus system having a reduced size does not exceed 15 m (50 ft) and has a current rating at least equal to one-third the rating or setting of the overcurrent device ahead of the point of connection and provided that such a flexible bus system is free from contact with combustible material. [371.17(G)](https://2023.antflix.net#371.17(G))
|
https://2023.antflix.net#371.17(G)
|
Chapter 3 Wiring Methods and Materials
|
371.18
|
Installation of flexible bus systems shall comply with 371.18(A) through (E). [371.18](https://2023.antflix.net#371.18)
|
https://2023.antflix.net#371.18
|
Chapter 3 Wiring Methods and Materials
|
371.18(A)
|
Flexible bus systems shall be installed under design engineering supervision and in accordance with the manufacturer's instructions, including supporting and securing. All documentation shall be available to the authority having jurisdiction. [371.18(A)](https://2023.antflix.net#371.18(A))
|
https://2023.antflix.net#371.18(A)
|
Chapter 3 Wiring Methods and Materials
|
371.18(B)
|
Flexible bus systems subject to physical damage shall have approved protective means installed. Informational Note: Typical methods of protecting flexible bus systems from physical damage include suitable barriers, guards, or elevation. [371.18(B)](https://2023.antflix.net#371.18(B))
|
https://2023.antflix.net#371.18(B)
|
Chapter 3 Wiring Methods and Materials
|
371.18(C)
|
Flexible bus systems shall be permitted to extend transversely through partitions or walls if the section within the wall is continuous and protected against physical damage. Where the flexible bus systems penetrate a fire-resistant-rated wall or partition, the installation shall be made in accordance with 300.21. [371.18(C)](https://2023.antflix.net#371.18(C))
|
https://2023.antflix.net#371.18(C)
|
Chapter 3 Wiring Methods and Materials
|
371.18(D)
|
Flexible bus systems shall be permitted to extend vertically through dry floors and platforms. Where the flexible bus systems penetrate a fire-resistant-rated floor or ceiling, the installation shall be made in accordance with 300.21. [371.18(D)](https://2023.antflix.net#371.18(D))
|
https://2023.antflix.net#371.18(D)
|
Chapter 3 Wiring Methods and Materials
|
371.18(E)
|
Flexible bus systems shall be permitted to extend vertically through floors and platforms in wet locations as follows: Where there are curbs or other suitable means to prevent waterflow through the floor or platform openingWhere the flexible bus system provides a means to seal the floor penetrationWhere the flexible bus systems penetrate a fire-resistant-rated floor or ceiling, the installation shall be made in accordance with 300.21. [371.18(E)](https://2023.antflix.net#371.18(E))
|
https://2023.antflix.net#371.18(E)
|
Chapter 3 Wiring Methods and Materials
|
371.20
|
Flexible bus system terminations shall comply with 371.20(A) and (B). [371.20](https://2023.antflix.net#371.20)
|
https://2023.antflix.net#371.20
|
Chapter 3 Wiring Methods and Materials
|
371.20(A)
|
Flexible bus systems shall be terminated with fittings or connectors listed for flexible bus systems. Informational Note: See 110.14(C) for conductor temperature limitations due to termination provisions. [371.20(A)](https://2023.antflix.net#371.20(A))
|
https://2023.antflix.net#371.20(A)
|
Chapter 3 Wiring Methods and Materials
|
371.20(B)
|
The connection of a flexible bus system to the distribution equipment shall comply with one of the following: Be listed and marked by the specific distribution equipment as an acceptable means of terminationBe listed and identified for the specific distribution equipment as an acceptable means of terminationIncorporate, as part of the listed flexible bus system, a transition box to interface between the flexible bus system and the distribution equipment [371.20(B)](https://2023.antflix.net#371.20(B))
|
https://2023.antflix.net#371.20(B)
|
Chapter 3 Wiring Methods and Materials
|
371.30
|
Flexible insulated bus conductors shall be supported on identified mounting means at intervals not greater than 900 mm (3 ft) for horizontal runs and 450 mm (11/2 ft) for vertical runs unless otherwise permitted by the product listing. Flexible bus systems shall be secured and supported by listed associated fittings in accordance with 371.30(A) through (C). [371.30](https://2023.antflix.net#371.30)
|
https://2023.antflix.net#371.30
|
Chapter 3 Wiring Methods and Materials
|
371.30(A)
|
Associated fittings shall be part of a listed flexible bus system. [371.30(A)](https://2023.antflix.net#371.30(A))
|
https://2023.antflix.net#371.30(A)
|
Chapter 3 Wiring Methods and Materials
|
371.30(B)
|
The support brackets for flexible bus systems shall be secured to the building structure or to other associated fittings that are secured to the building structure. [371.30(B)](https://2023.antflix.net#371.30(B))
|
https://2023.antflix.net#371.30(B)
|
Chapter 3 Wiring Methods and Materials
|
371.30(C)
|
Flexible bus systems shall be permitted to be installed in support trays supplied as associated fittings for the listed flexible bus system. Support trays shall not be required to be continuous. [371.30(C)](https://2023.antflix.net#371.30(C))
|
https://2023.antflix.net#371.30(C)
|
Chapter 3 Wiring Methods and Materials
|
371.40
|
Flexible bus systems shall have a short circuit current rating sufficient for the available fault current. [371.40](https://2023.antflix.net#371.40)
|
https://2023.antflix.net#371.40
|
Chapter 3 Wiring Methods and Materials
|
371.60
|
Conductive associated fitting supports for flexible bus systems shall be bonded together and grounded. [371.60](https://2023.antflix.net#371.60)
|
https://2023.antflix.net#371.60
|
Chapter 3 Wiring Methods and Materials
|
371.120
|
Each section of flexible bus systems shall be marked with the manufacturer's name or trade designation, voltage rating, and current rating. Markings shall be located so as to be visible after installation. [371.120](https://2023.antflix.net#371.120)
|
https://2023.antflix.net#371.120
|
Chapter 3 Wiring Methods and Materials
|
371.120(A)
|
A system nameplate shall contain the manufacturer's name or trademark and the flexible bus system ratings. The ratings shall include the voltage, phase, current rating, short circuit current rating, and applicable environmental ratings. The nameplate shall be installed at each end of the flexible bus system. The nameplate shall be visible after installation. [371.120(A)](https://2023.antflix.net#371.120(A))
|
https://2023.antflix.net#371.120(A)
|
Chapter 3 Wiring Methods and Materials
|
371.120(B)
|
Associated fittings shall be marked as suitable for flexible bus systems. [371.120(B)](https://2023.antflix.net#371.120(B))
|
https://2023.antflix.net#371.120(B)
|
Chapter 3 Wiring Methods and Materials
|
371.120(C)
|
The flexible insulated bus shall be marked along the insulation with the manufacturer's name or trademark, voltage, manufacturer's part identification, and insulation temperature ratings. [371.120(C)](https://2023.antflix.net#371.120(C))
|
https://2023.antflix.net#371.120(C)
|
Chapter 3 Wiring Methods and Materials
|
372.1
|
This article covers cellular concrete floor raceways, the hollow spaces in floors constructed of precast cellular concrete slabs, together with suitable metal fittings designed to provide access to the floor cells. [372.1](https://2023.antflix.net#372.1)
|
https://2023.antflix.net#372.1
|
Chapter 3 Wiring Methods and Materials
|
372.12
|
Conductors shall not be installed in precast cellular concrete floor raceways as follows: Where subject to corrosive vaporIn any hazardous (classified) location, except as permitted by other articles in this CodeIn commercial garages, other than for supplying ceiling outlets or extensions to the area below the floor but not aboveInformational Note: See 300.8 for installation of conductors with other systems. [372.12](https://2023.antflix.net#372.12)
|
https://2023.antflix.net#372.12
|
Chapter 3 Wiring Methods and Materials
|
372.18
|
Installation of cellular concrete floor raceways shall comply with 372.18(A) through (E). [372.18](https://2023.antflix.net#372.18)
|
https://2023.antflix.net#372.18
|
Chapter 3 Wiring Methods and Materials
|
372.18(A)
|
The header shall be installed in a straight line at right angles to the cells. The header shall be mechanically secured to the top of the precast cellular concrete floor. The end joints shall be closed by a metal closure fitting and sealed against the entrance of concrete. The header shall be electrically continuous throughout its entire length and shall be electrically bonded to the enclosure of the distribution center. [372.18(A)](https://2023.antflix.net#372.18(A))
|
https://2023.antflix.net#372.18(A)
|
Chapter 3 Wiring Methods and Materials
|
372.18(B)
|
Connections from headers to cabinets and other enclosures shall be made by means of listed metal raceways and listed fittings. [372.18(B)](https://2023.antflix.net#372.18(B))
|
https://2023.antflix.net#372.18(B)
|
Chapter 3 Wiring Methods and Materials
|
372.18(C)
|
Junction boxes shall be leveled to the floor grade and sealed against the free entrance of water or concrete. Junction boxes shall be of metal and shall be mechanically and electrically continuous with the header. [372.18(C)](https://2023.antflix.net#372.18(C))
|
https://2023.antflix.net#372.18(C)
|
Chapter 3 Wiring Methods and Materials
|
372.18(D)
|
Inserts shall be leveled and sealed against the entrance of concrete. Inserts shall be of metal and shall be fitted with grounded-type receptacles. An equipment grounding conductor or bonding jumper shall connect the insert receptacles to a positive ground connection provided on the header. Where cutting through the cell wall for setting inserts or other purposes (such as providing access openings between header and cells), chips and other dirt shall not be allowed to remain in the raceway, and the tool used shall be designed so as to prevent the tool from entering the cell and damaging the conductors. [372.18(D)](https://2023.antflix.net#372.18(D))
|
https://2023.antflix.net#372.18(D)
|
Chapter 3 Wiring Methods and Materials
|
372.18(E)
|
A suitable number of markers shall be installed for the future location of cells. [372.18(E)](https://2023.antflix.net#372.18(E))
|
https://2023.antflix.net#372.18(E)
|
Chapter 3 Wiring Methods and Materials
|
372.20
|
No conductor larger than 1/0 AWG shall be installed, except by special permission. [372.20](https://2023.antflix.net#372.20)
|
https://2023.antflix.net#372.20
|
Chapter 3 Wiring Methods and Materials
|
372.22
|
The combined cross-sectional area of all conductors or cables shall not exceed 40 percent of the cross-sectional area of the cell or header. [372.22](https://2023.antflix.net#372.22)
|
https://2023.antflix.net#372.22
|
Chapter 3 Wiring Methods and Materials
|
372.23
|
The ampacity adjustment factors as provided in 310.15(C) shall apply to conductors installed in cellular concrete floor raceways. [372.23](https://2023.antflix.net#372.23)
|
https://2023.antflix.net#372.23
|
Chapter 3 Wiring Methods and Materials
|
372.56
|
Splices and taps shall be made only in header access units or junction boxes. A continuous unbroken conductor connecting the individual outlets is not a splice or tap. [372.56](https://2023.antflix.net#372.56)
|
https://2023.antflix.net#372.56
|
Chapter 3 Wiring Methods and Materials
|
372.58
|
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 of abandoned outlets on loop wiring, shall be allowed in raceways. [372.58](https://2023.antflix.net#372.58)
|
https://2023.antflix.net#372.58
|
Chapter 3 Wiring Methods and Materials
|
374.1
|
This article covers the use and installation requirements for cellular metal floor raceways. [374.1](https://2023.antflix.net#374.1)
|
https://2023.antflix.net#374.1
|
Chapter 3 Wiring Methods and Materials
|
374.6
|
Cellular metal floor raceways and associated fittings shall be listed. [374.6](https://2023.antflix.net#374.6)
|
https://2023.antflix.net#374.6
|
Chapter 3 Wiring Methods and Materials
|
374.12
|
Conductors shall not be installed in cellular metal floor raceways as follows: Where subject to corrosive vaporIn any hazardous (classified) location, except as permitted by other articles in this CodeIn commercial garages, other than for supplying ceiling outlets or extensions to the area below the floor but not aboveInformational Note: See 300.8 for installation of conductors with other systems. [374.12](https://2023.antflix.net#374.12)
|
https://2023.antflix.net#374.12
|
Chapter 3 Wiring Methods and Materials
|
374.18
|
Installation of cellular metal floor raceways shall comply with 374.18(A) through (D). [374.18](https://2023.antflix.net#374.18)
|
https://2023.antflix.net#374.18
|
Chapter 3 Wiring Methods and Materials
|
374.18(A)
|
Connections between raceways and distribution centers and wall outlets shall be made by means of liquidtight flexible metal conduit, flexible metal conduit where not installed in concrete, rigid metal conduit, intermediate metal conduit, electrical metallic tubing, or approved fittings. Where there are provisions for the termination of an equipment grounding conductor, rigid polyvinyl chloride conduit, reinforced thermosetting resin conduit, electrical nonmetallic tubing, or liquidtight flexible nonmetallic conduit shall be permitted. Where installed in concrete, liquidtight flexible metal conduit and liquidtight flexible nonmetallic conduit shall be listed and marked for direct burial. [374.18(A)](https://2023.antflix.net#374.18(A))
|
https://2023.antflix.net#374.18(A)
|
Chapter 3 Wiring Methods and Materials
|
374.18(B)
|
Junction boxes shall be leveled to the floor grade and sealed against the free entrance of water or concrete. Junction boxes used with these raceways shall be of metal and shall be electrically continuous with the raceway. [374.18(B)](https://2023.antflix.net#374.18(B))
|
https://2023.antflix.net#374.18(B)
|
Chapter 3 Wiring Methods and Materials
|
374.18(C)
|
Inserts shall be leveled to the floor grade and sealed against the entrance of concrete. Inserts shall be of metal and shall be electrically continuous with the raceway. In cutting through the cell wall and setting inserts, chips and other dirt shall not be allowed to remain in the raceway, and tools shall be used that are designed to prevent the tool from entering the cell and damaging the conductors. [374.18(C)](https://2023.antflix.net#374.18(C))
|
https://2023.antflix.net#374.18(C)
|
Chapter 3 Wiring Methods and Materials
|
374.18(D)
|
A suitable number of markers shall be installed for locating cells in the future. [374.18(D)](https://2023.antflix.net#374.18(D))
|
https://2023.antflix.net#374.18(D)
|
Chapter 3 Wiring Methods and Materials
|
374.20
|
No conductor larger than 1/0 AWG shall be installed, except by special permission. [374.20](https://2023.antflix.net#374.20)
|
https://2023.antflix.net#374.20
|
Chapter 3 Wiring Methods and Materials
|
374.22
|
The combined cross-sectional area of all conductors or cables shall not exceed 40 percent of the interior cross-sectional area of the cell or header. [374.22](https://2023.antflix.net#374.22)
|
https://2023.antflix.net#374.22
|
Chapter 3 Wiring Methods and Materials
|
374.23
|
The ampacity adjustment factors in 310.15(C) shall apply to conductors installed in cellular metal floor raceways. [374.23](https://2023.antflix.net#374.23)
|
https://2023.antflix.net#374.23
|
Chapter 3 Wiring Methods and Materials
|
374.56
|
Splices and taps shall be made only in header access units or 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. [374.56](https://2023.antflix.net#374.56)
|
https://2023.antflix.net#374.56
|
Chapter 3 Wiring Methods and Materials
|
374.58
|
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. [374.58](https://2023.antflix.net#374.58)
|
https://2023.antflix.net#374.58
|
Chapter 3 Wiring Methods and Materials
|
374.100
|
Cellular metal floor raceways shall be constructed so that adequate electrical and mechanical continuity of the complete system will be secured. They shall provide a complete enclosure for the conductors. The interior surfaces shall be free from burrs and sharp edges, and surfaces over which conductors are drawn shall be smooth. Suitable bushings or fittings having smooth rounded edges shall be provided where conductors pass. [374.100](https://2023.antflix.net#374.100)
|
https://2023.antflix.net#374.100
|
Chapter 3 Wiring Methods and Materials
|
376.1
|
This article covers the use, installation, and construction specifications for metal wireways and associated fittings. [376.1](https://2023.antflix.net#376.1)
|
https://2023.antflix.net#376.1
|
Chapter 3 Wiring Methods and Materials
|
376.10
|
The use of metal wireways shall be permitted as follows: For exposed work.In any hazardous (classified) location, as permitted by other articles in this Code.In wet locations where wireways are listed for the purpose.In concealed spaces as an extension that passes 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. [376.10](https://2023.antflix.net#376.10)
|
https://2023.antflix.net#376.10
|
Chapter 3 Wiring Methods and Materials
|
376.12
|
Metal wireways shall not be used in the following: Where subject to severe physical damageWhere subject to severe corrosive environments [376.12](https://2023.antflix.net#376.12)
|
https://2023.antflix.net#376.12
|
Chapter 3 Wiring Methods and Materials
|
376.20
|
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. Informational Note: The purpose of having all parallel conductor sets within the same group is to prevent current imbalance in the paralleled conductors due to inductive reactance. [376.20](https://2023.antflix.net#376.20)
|
https://2023.antflix.net#376.20
|
Chapter 3 Wiring Methods and Materials
|
376.21
|
No conductor larger than that for which the wireway is designed shall be installed in any wireway. [376.21](https://2023.antflix.net#376.21)
|
https://2023.antflix.net#376.21
|
Chapter 3 Wiring Methods and Materials
|
376.22
|
The number of conductors or cables and their ampacity shall comply with 376.22(A) and (B). [376.22](https://2023.antflix.net#376.22)
|
https://2023.antflix.net#376.22
|
Chapter 3 Wiring Methods and Materials
|
376.22(A)
|
The sum of the cross-sectional areas of all contained conductors and cables at any cross section of a wireway shall not exceed 20 percent of the interior cross-sectional area of the wireway. [376.22(A)](https://2023.antflix.net#376.22(A))
|
https://2023.antflix.net#376.22(A)
|
Chapter 3 Wiring Methods and Materials
|
376.22(B)
|
The adjustment factors in 310.15(C)(1) shall be applied only where the number of current-carrying conductors, including neutral conductors classified as current-carrying under 310.15(E), exceeds 30 at any cross section of the 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. [376.22(B)](https://2023.antflix.net#376.22(B))
|
https://2023.antflix.net#376.22(B)
|
Chapter 3 Wiring Methods and Materials
|
376.23
|
Insulated conductors installed in a metal wireway shall comply with 376.23(A) and (B). [376.23](https://2023.antflix.net#376.23)
|
https://2023.antflix.net#376.23
|
Chapter 3 Wiring Methods and Materials
|
376.23(A)
|
Where insulated conductors are deflected within a metal wireway, either at the ends or where conduits, fittings, or other raceways or cables enter or leave the metal wireway, or where the direction of the metal wireway is deflected greater than 30 degrees, dimensions corresponding to one wire per terminal in Table 312.6(A) shall apply. [376.23(A)](https://2023.antflix.net#376.23(A))
|
https://2023.antflix.net#376.23(A)
|
Chapter 3 Wiring Methods and Materials
|
376.23(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 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. [376.23(B)](https://2023.antflix.net#376.23(B))
|
https://2023.antflix.net#376.23(B)
|
Chapter 3 Wiring Methods and Materials
|
376.30
|
Metal wireways shall be supported in accordance with 376.30(A) and (B). [376.30](https://2023.antflix.net#376.30)
|
https://2023.antflix.net#376.30
|
Chapter 3 Wiring Methods and Materials
|
376.30(A)
|
Wireways shall be supported where run horizontally at each end and at intervals not to exceed 1.5 m (5 ft) or for individual lengths longer than 1.5 m (5 ft) at each end or joint, unless listed for other support intervals. The distance between supports shall not exceed 3 m (10 ft). [376.30(A)](https://2023.antflix.net#376.30(A))
|
https://2023.antflix.net#376.30(A)
|
Chapter 3 Wiring Methods and Materials
|
376.30(B)
|
Vertical runs of wireways shall be securely supported at intervals not exceeding 4.5 m (15 ft) and shall not have more than one joint between supports. Adjoining wireway sections shall be securely fastened together to provide a rigid joint. [376.30(B)](https://2023.antflix.net#376.30(B))
|
https://2023.antflix.net#376.30(B)
|
Chapter 3 Wiring Methods and Materials
|
376.56(A)
|
Splices and taps shall be permitted within a wireway, provided they are accessible. The conductors, including splices and taps, shall not fill the wireway to more than 75 percent of its area at that point. [376.56(A)](https://2023.antflix.net#376.56(A))
|
https://2023.antflix.net#376.56(A)
|
Chapter 3 Wiring Methods and Materials
|
376.56(B)(1)
|
Power distribution blocks installed in metal wireways shall be listed. Power distribution blocks installed on the line side of the service equipment shall be marked "suitable for use on the line side of service equipment" or equivalent. [376.56(B)(1)](https://2023.antflix.net#376.56(B)(1))
|
https://2023.antflix.net#376.56(B)(1)
|
Chapter 3 Wiring Methods and Materials
|
376.56(B)(2)
|
In addition to the wiring space requirement in 376.56(A), the power distribution block shall be installed in a wireway with dimensions not smaller than specified in the installation instructions of the power distribution block. [376.56(B)(2)](https://2023.antflix.net#376.56(B)(2))
|
https://2023.antflix.net#376.56(B)(2)
|
Chapter 3 Wiring Methods and Materials
|
376.56(B)(3)
|
Wire bending space at the terminals of power distribution blocks shall comply with 312.6(B). [376.56(B)(3)](https://2023.antflix.net#376.56(B)(3))
|
https://2023.antflix.net#376.56(B)(3)
|
Chapter 3 Wiring Methods and Materials
|
376.56(B)(4)
|
Power distribution blocks shall not have uninsulated live parts exposed within a wireway, whether or not the wireway cover is installed. [376.56(B)(4)](https://2023.antflix.net#376.56(B)(4))
|
https://2023.antflix.net#376.56(B)(4)
|
Chapter 3 Wiring Methods and Materials
|
376.56(B)(5)
|
Conductors shall be arranged so the power distribution block terminals are unobstructed following installation. [376.56(B)(5)](https://2023.antflix.net#376.56(B)(5))
|
https://2023.antflix.net#376.56(B)(5)
|
Chapter 3 Wiring Methods and Materials
|
376.58
|
Dead ends of metal wireways shall be closed. [376.58](https://2023.antflix.net#376.58)
|
https://2023.antflix.net#376.58
|
Chapter 3 Wiring Methods and Materials
|
376.60
|
Listed metal wireway shall be permitted as an equipment grounding conductor in accordance with 250.118(A)(13). [376.60](https://2023.antflix.net#376.60)
|
https://2023.antflix.net#376.60
|
Chapter 3 Wiring Methods and Materials
|
376.70
|
Extensions from wireways shall be made with cord pendants installed in accordance with 400.14 or with any wiring method in Chapter 3 that includes a means for equipment grounding. Where a separate equipment grounding conductor is employed, connection of the equipment grounding conductors in the wiring method to the wireway shall comply with 250.8 and 250.12. [376.70](https://2023.antflix.net#376.70)
|
https://2023.antflix.net#376.70
|
Chapter 3 Wiring Methods and Materials
|
376.100(A)
|
Wireways shall be constructed and installed so that electrical and mechanical continuity of the complete system are assured. [376.100(A)](https://2023.antflix.net#376.100(A))
|
https://2023.antflix.net#376.100(A)
|
Chapter 3 Wiring Methods and Materials
|
376.100(B)
|
Wireways shall be of substantial construction and shall provide a complete enclosure for the contained conductors. All surfaces, both interior and exterior, shall be suitably protected from corrosion. Corner joints shall be made tight, and where the assembly is held together by rivets, bolts, or screws, such fasteners shall be spaced not more than 300 mm (12 in.) apart. [376.100(B)](https://2023.antflix.net#376.100(B))
|
https://2023.antflix.net#376.100(B)
|
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