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Chapter 3 Wiring Methods and Materials
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362.2
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ENT shall not be reconditioned. [362.2](https://2023.antflix.net#362.2)
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https://2023.antflix.net#362.2
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Chapter 3 Wiring Methods and Materials
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362.6
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ENT and associated fittings shall be listed. [362.6](https://2023.antflix.net#362.6)
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https://2023.antflix.net#362.6
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Chapter 3 Wiring Methods and Materials
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362.10
|
For the purpose of this article, the first floor of a building shall be that floor that has 50 percent or more of the exterior wall surface area level with or above finished grade. One additional level that is the first level and not designed for human habitation and used only for vehicle parking, storage, or similar use shall be permitted. The use of ENT and fittings shall be permitted in the following: In any building not exceeding three floors above grade as follows:For exposed work, where not prohibited by 362.12Concealed within walls, floors, and ceilingsIn any building exceeding three floors above grade concealed within combustible or noncombustible walls, floors, and ceilings where the walls, floors, and ceilings provide a thermal barrier of material that has at least a 15-minute finish rating as identified in listings of fire-rated assemblies.Exception to (2): Where an approved automatic fire protective system(s) is installed on all floors, ENT shall be permitted to be used within walls, floors, and ceilings, exposed or concealed, in buildings exceeding three floors above grade.Informational Note No. 1: A finish rating is established for assemblies containing combustible (wood) supports. The finish rating is defined as the time at which the wood stud or wood joist reaches an average temperature rise of 121°C (250°F) or an individual temperature of 163°C (325°F) as measured on the plane of the wood nearest the fire. A finish rating is not intended to represent a rating for a membrane ceiling.Informational Note No. 2: See NFPA 13-2022, Standard for the Installation of Sprinkler Systems, a recognized fire sprinkler system(s) standard.In locations subject to severe corrosive influences as covered in 300.6 and where subject to chemicals for which the materials are specifically approved.In concealed, dry, and damp locations not prohibited by 362.12.Above suspended ceilings where the suspended ceilings provide a thermal barrier of material that has at least a 15-minute finish rating as identified in listings of fire-rated assemblies, except as permitted in 362.10(1)a.Exception to (5): ENT shall be permitted to be used above suspended ceilings in buildings exceeding three floors above grade where the building is protected throughout by an approved automatic fire protective system.Informational Note No. 3: See NFPA 13-2022, Standard for the Installation of Sprinkler Systems, a recognized fire sprinkler system(s) standard.Encased in poured concrete floors, ceilings, walls, and slabs.Embedded in a concrete slab on grade where ENT is placed on sand or approved screenings, provided fittings identified for this purpose are used for connections.For wet locations as permitted in this section or in a concrete slab on or belowgrade, with fittings listed for the purpose.Metric designator 16 through 27 (trade size 1/2 through 1) as listed manufactured prewired assembly.With conductors or cables rated at a temperature higher than the listed temperature rating of ENT if the conductors or cables are not operated at a temperature higher than the listed temperature rating of the ENT. [362.10](https://2023.antflix.net#362.10)
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https://2023.antflix.net#362.10
|
Chapter 3 Wiring Methods and Materials
|
362.12
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ENT shall not be used in the following: In any hazardous (classified) location, except as permitted by other articles in this CodeFor the support of luminaires and other equipmentWhere subject to ambient temperatures in excess of 50°C (122°F) unless listed otherwiseFor direct earth burialIn exposed locations, except as permitted by 362.10(1), 362.10(5), and 362.10(8)In theaters and similar locations, except as provided in 518.4 and 520.5Where exposed to the direct rays of the sun, unless identified as sunlight resistantWhere subject to physical damageInformational Note: Extreme cold may cause some types of nonmetallic conduits to become brittle and therefore more susceptible to damage from physical contact. [362.12](https://2023.antflix.net#362.12)
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https://2023.antflix.net#362.12
|
Chapter 3 Wiring Methods and Materials
|
362.20(A)
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ENT smaller than metric designator 16 (trade size 1/2) shall not be used. [362.20(A)](https://2023.antflix.net#362.20(A))
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https://2023.antflix.net#362.20(A)
|
Chapter 3 Wiring Methods and Materials
|
362.20(B)
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ENT larger than metric designator 63 (trade size 21/2) shall not be used. Informational Note: See 300.1(C) for the metric designators and trade sizes. These are for identification purposes only and do not relate to actual dimensions. [362.20(B)](https://2023.antflix.net#362.20(B))
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https://2023.antflix.net#362.20(B)
|
Chapter 3 Wiring Methods and Materials
|
362.22
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The number of conductors shall not exceed that permitted by the percentage fill in Table 1, Chapter 9. Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles. The number of cables shall not exceed the allowable percentage fill specified in Table 1, Chapter 9. [362.22](https://2023.antflix.net#362.22)
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https://2023.antflix.net#362.22
|
Chapter 3 Wiring Methods and Materials
|
362.24(A)
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Bends shall be so made that the tubing will not be damaged and the internal diameter of the tubing will not be effectively reduced. Bends shall be permitted to be made manually without auxiliary equipment, and the radius of the curve to the centerline of such bends shall not be less than shown in Table 2, Chapter 9 using the column "Other Bends." [362.24(A)](https://2023.antflix.net#362.24(A))
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https://2023.antflix.net#362.24(A)
|
Chapter 3 Wiring Methods and Materials
|
362.24(B)
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The total degrees of bends in a tubing run shall not exceed 360 degrees between pull points. [362.24(B)](https://2023.antflix.net#362.24(B))
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https://2023.antflix.net#362.24(B)
|
Chapter 3 Wiring Methods and Materials
|
362.28
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All cut ends shall be trimmed inside and outside to remove rough edges. [362.28](https://2023.antflix.net#362.28)
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https://2023.antflix.net#362.28
|
Chapter 3 Wiring Methods and Materials
|
362.30
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ENT shall be installed as a complete system in accordance with 300.18 and shall be securely fastened in place by an approved means and supported in accordance with 362.30(A) and (B). [362.30](https://2023.antflix.net#362.30)
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https://2023.antflix.net#362.30
|
Chapter 3 Wiring Methods and Materials
|
362.30(A)
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ENT shall be securely fastened at intervals not exceeding 900 mm (3 ft). In addition, ENT shall be securely fastened in place within 900 mm (3 ft) of each outlet box, device box, junction box, cabinet, or fitting where it terminates. Where used, cable ties shall be listed for the application and for securing and supporting. Exception No. 1: Lengths not exceeding a distance of 1.8 m (6 ft) from a luminaire, terminal connection for tap connections to lighting luminaires shall be permitted without being secured. Exception No. 2: Lengths not exceeding 1.8 m (6 ft) from the last point where the raceway is securely fastened for connections within an accessible ceiling to luminaire(s) or other equipment. Exception No. 3: For concealed work in finished buildings or prefinished wall panels where such securing is impracticable, unbroken lengths (without coupling) of ENT shall be permitted to be fished. [362.30(A)](https://2023.antflix.net#362.30(A))
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https://2023.antflix.net#362.30(A)
|
Chapter 3 Wiring Methods and Materials
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362.30(B)
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Horizontal runs of ENT supported by openings in framing members at intervals not exceeding 900 mm (3 ft) and securely fastened within 900 mm (3 ft) of termination points shall be permitted. [362.30(B)](https://2023.antflix.net#362.30(B))
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https://2023.antflix.net#362.30(B)
|
Chapter 3 Wiring Methods and Materials
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362.46
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Where a tubing enters a box, fitting, or other enclosure, a bushing or adapter shall be provided to protect the wire from abrasion unless the box, fitting, or enclosure design provides equivalent protection. Informational Note: See 300.4(G) for the protection of conductors size 4 AWG or larger. [362.46](https://2023.antflix.net#362.46)
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https://2023.antflix.net#362.46
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Chapter 3 Wiring Methods and Materials
|
362.48
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All joints between lengths of tubing and between tubing and couplings, fittings, and boxes shall be by an approved method. [362.48](https://2023.antflix.net#362.48)
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https://2023.antflix.net#362.48
|
Chapter 3 Wiring Methods and Materials
|
362.56
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Splices and taps shall be made only in accordance with 300.15. [362.56](https://2023.antflix.net#362.56)
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https://2023.antflix.net#362.56
|
Chapter 3 Wiring Methods and Materials
|
362.60
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Where equipment grounding is required, a separate grounding conductor shall be installed in the raceway in compliance with Article 250, Part VI. Exception No. 1: The equipment grounding conductor shall be permitted to be run separately from the raceway where used for grounding dc circuits as permitted in 250.134, Exception No. 2. Exception No. 2: The equipment grounding conductor shall not be required where the grounded conductor is used as part of the effective ground-fault path as permitted in 250.142. [362.60](https://2023.antflix.net#362.60)
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https://2023.antflix.net#362.60
|
Chapter 3 Wiring Methods and Materials
|
362.100
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ENT shall be made of material that does not exceed the ignitibility, flammability, smoke generation, and toxicity characteristics of rigid (nonplasticized) polyvinyl chloride. ENT, as a prewired manufactured assembly, shall be provided in continuous lengths capable of being shipped in a coil, reel, or carton without damage. [362.100](https://2023.antflix.net#362.100)
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https://2023.antflix.net#362.100
|
Chapter 3 Wiring Methods and Materials
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362.120
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ENT shall be clearly and durably marked at least every 3 m (10 ft) as required in the first sentence of 110.21(A). The type of material shall also be included in the marking. Marking for limited smoke shall be permitted on the tubing that has limited smoke-producing characteristics. The type, size, and quantity of conductors used in prewired manufactured assemblies shall be identified by means of a printed tag or label attached to each end of the manufactured assembly and either the carton, coil, or reel. The enclosed conductors shall be marked in accordance with 310.8. [362.120](https://2023.antflix.net#362.120)
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https://2023.antflix.net#362.120
|
Chapter 3 Wiring Methods and Materials
|
366.1
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This article covers the use, installation, and construction requirements of metal auxiliary gutters and nonmetallic auxiliary gutters and associated fittings. [366.1](https://2023.antflix.net#366.1)
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https://2023.antflix.net#366.1
|
Chapter 3 Wiring Methods and Materials
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366.6(A)
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Nonmetallic auxiliary gutters installed outdoors shall be listed for all of the following conditions: Exposure to sunlightUse in wet locationsMaximum ambient temperature of the installation [366.6(A)](https://2023.antflix.net#366.6(A))
|
https://2023.antflix.net#366.6(A)
|
Chapter 3 Wiring Methods and Materials
|
366.6(B)
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Nonmetallic auxiliary gutters installed indoors shall be listed for the maximum ambient temperature of the installation. [366.6(B)](https://2023.antflix.net#366.6(B))
|
https://2023.antflix.net#366.6(B)
|
Chapter 3 Wiring Methods and Materials
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366.10(A)(1)
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Sheet metal auxiliary gutters shall be permitted for indoor and outdoor use. [366.10(A)(1)](https://2023.antflix.net#366.10(A)(1))
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https://2023.antflix.net#366.10(A)(1)
|
Chapter 3 Wiring Methods and Materials
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366.10(A)(2)
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Sheet metal auxiliary gutters installed in wet locations shall be suitable for such locations. [366.10(A)(2)](https://2023.antflix.net#366.10(A)(2))
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https://2023.antflix.net#366.10(A)(2)
|
Chapter 3 Wiring Methods and Materials
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366.10(B)
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Nonmetallic auxiliary gutters shall be listed for the maximum ambient temperature of the installation and marked for the installed conductor insulation temperature rating. Informational Note: Extreme cold may cause nonmetallic auxiliary gutters to become brittle and therefore more susceptible to damage from physical contact. [366.10(B)](https://2023.antflix.net#366.10(B))
|
https://2023.antflix.net#366.10(B)
|
Chapter 3 Wiring Methods and Materials
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366.10(B)(1)
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Nonmetallic auxiliary gutters shall be permitted to be installed outdoors where listed and marked as suitable for the purpose. [366.10(B)(1)](https://2023.antflix.net#366.10(B)(1))
|
https://2023.antflix.net#366.10(B)(1)
|
Chapter 3 Wiring Methods and Materials
|
366.10(B)(2)
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Nonmetallic auxiliary gutters shall be permitted to be installed indoors. [366.10(B)(2)](https://2023.antflix.net#366.10(B)(2))
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https://2023.antflix.net#366.10(B)(2)
|
Chapter 3 Wiring Methods and Materials
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366.10(C)
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Auxiliary gutters shall be permitted to extend a distance not greater than 9 m (30 ft) beyond the equipment that it supplements. Exception: Where used in accordance with 620.35 for elevators, an auxiliary gutter shall be permitted to extend a distance greater than 9 m (30 ft) beyond the equipment it supplements. [366.10(C)](https://2023.antflix.net#366.10(C))
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https://2023.antflix.net#366.10(C)
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Chapter 3 Wiring Methods and Materials
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366.12
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Auxiliary gutters shall not be used to enclose switches, overcurrent devices, appliances, or other similar equipment. [366.12](https://2023.antflix.net#366.12)
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https://2023.antflix.net#366.12
|
Chapter 3 Wiring Methods and Materials
|
366.20
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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. [366.20](https://2023.antflix.net#366.20)
|
https://2023.antflix.net#366.20
|
Chapter 3 Wiring Methods and Materials
|
366.22(A)
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The sum of the cross-sectional areas of all contained conductors and cables at any cross section of a sheet metal auxiliary gutter shall not exceed 20 percent of the interior cross-sectional area of the sheet metal auxiliary gutter. [366.22(A)](https://2023.antflix.net#366.22(A))
|
https://2023.antflix.net#366.22(A)
|
Chapter 3 Wiring Methods and Materials
|
366.22(B)
|
The sum of cross-sectional areas of all contained conductors and cables at any cross section of the nonmetallic auxiliary gutter shall not exceed 20 percent of the interior cross-sectional area of the nonmetallic auxiliary gutter. [366.22(B)](https://2023.antflix.net#366.22(B))
|
https://2023.antflix.net#366.22(B)
|
Chapter 3 Wiring Methods and Materials
|
366.23(A)
|
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 sheet metal auxiliary gutter. 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 current carried continuously in bare copper bars in sheet metal auxiliary gutters shall not exceed 1.55 amperes/mm2 (1000 amperes/in.2) of cross section of the conductor. For aluminum bars, the current carried continuously shall not exceed 1.09 amperes/mm2 (700 amperes/in.2) of cross section of the conductor. [366.23(A)](https://2023.antflix.net#366.23(A))
|
https://2023.antflix.net#366.23(A)
|
Chapter 3 Wiring Methods and Materials
|
366.23(B)
|
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 366.22(B). [366.23(B)](https://2023.antflix.net#366.23(B))
|
https://2023.antflix.net#366.23(B)
|
Chapter 3 Wiring Methods and Materials
|
366.30(A)
|
Sheet metal auxiliary gutters shall be supported and secured throughout their entire length at intervals not exceeding 1.5 m (5 ft). [366.30(A)](https://2023.antflix.net#366.30(A))
|
https://2023.antflix.net#366.30(A)
|
Chapter 3 Wiring Methods and Materials
|
366.30(B)
|
Nonmetallic auxiliary gutters shall be supported and secured 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). [366.30(B)](https://2023.antflix.net#366.30(B))
|
https://2023.antflix.net#366.30(B)
|
Chapter 3 Wiring Methods and Materials
|
366.44
|
Expansion fittings shall be installed where expected length change, due to expansion and contraction due to temperature change, is more than 6 mm (0.25 in.). [366.44](https://2023.antflix.net#366.44)
|
https://2023.antflix.net#366.44
|
Chapter 3 Wiring Methods and Materials
|
366.56
|
Splices and taps shall comply with 366.56(A) through (D). [366.56](https://2023.antflix.net#366.56)
|
https://2023.antflix.net#366.56
|
Chapter 3 Wiring Methods and Materials
|
366.56(A)
|
Splices or taps shall be permitted within gutters where they are accessible by means of removable covers or doors. The conductors, including splices and taps, shall not fill the gutter to more than 75 percent of its area. [366.56(A)](https://2023.antflix.net#366.56(A))
|
https://2023.antflix.net#366.56(A)
|
Chapter 3 Wiring Methods and Materials
|
366.56(B)
|
Taps from bare conductors shall leave the gutter opposite their terminal connections, and conductors shall not be brought in contact with uninsulated current-carrying parts of different voltages. [366.56(B)](https://2023.antflix.net#366.56(B))
|
https://2023.antflix.net#366.56(B)
|
Chapter 3 Wiring Methods and Materials
|
366.56(C)
|
All taps shall be suitably identified at the gutter as to the circuit or equipment that they supply. [366.56(C)](https://2023.antflix.net#366.56(C))
|
https://2023.antflix.net#366.56(C)
|
Chapter 3 Wiring Methods and Materials
|
366.56(D)
|
Tap connections from conductors in auxiliary gutters shall be provided with overcurrent protection as required in 240.21. [366.56(D)](https://2023.antflix.net#366.56(D))
|
https://2023.antflix.net#366.56(D)
|
Chapter 3 Wiring Methods and Materials
|
366.58(A)
|
Where insulated conductors are deflected within an auxiliary gutter, either at the ends or where conduits, fittings, or other raceways or cables enter or leave the gutter, or where the direction of the gutter is deflected greater than 30 degrees, dimensions corresponding to one wire per terminal in Table 312.6(A) shall apply. [366.58(A)](https://2023.antflix.net#366.58(A))
|
https://2023.antflix.net#366.58(A)
|
Chapter 3 Wiring Methods and Materials
|
366.58(B)
|
Where insulated conductors 4 AWG or larger are pulled through an auxiliary gutter, 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 314.28(A)(2) for angle pulls. [366.58(B)](https://2023.antflix.net#366.58(B))
|
https://2023.antflix.net#366.58(B)
|
Chapter 3 Wiring Methods and Materials
|
366.60
|
Metal auxiliary gutters shall be connected to an equipment grounding conductor(s), to an equipment bonding jumper, or to the grounded conductor where permitted or required by 250.92(B)(1) or 250.142. [366.60](https://2023.antflix.net#366.60)
|
https://2023.antflix.net#366.60
|
Chapter 3 Wiring Methods and Materials
|
366.100(A)
|
Gutters shall be constructed and installed so that adequate electrical and mechanical continuity of the complete system is secured. [366.100(A)](https://2023.antflix.net#366.100(A))
|
https://2023.antflix.net#366.100(A)
|
Chapter 3 Wiring Methods and Materials
|
366.100(B)
|
Gutters 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. [366.100(B)](https://2023.antflix.net#366.100(B))
|
https://2023.antflix.net#366.100(B)
|
Chapter 3 Wiring Methods and Materials
|
366.100(C)
|
Suitable bushings, shields, or fittings having smooth, rounded edges shall be provided where conductors pass between gutters, through partitions, around bends, between gutters and cabinets or junction boxes, and at other locations where necessary to prevent abrasion of the insulation of the conductors. [366.100(C)](https://2023.antflix.net#366.100(C))
|
https://2023.antflix.net#366.100(C)
|
Chapter 3 Wiring Methods and Materials
|
366.100(D)
|
Covers shall be securely fastened to the gutter. [366.100(D)](https://2023.antflix.net#366.100(D))
|
https://2023.antflix.net#366.100(D)
|
Chapter 3 Wiring Methods and Materials
|
366.100(E)
|
Bare conductors shall be securely and rigidly supported so that the minimum clearance between bare current-carrying metal parts of different voltages mounted on the same surface will not be less than 50 mm (2 in.), nor less than 25 mm (1 in.) for parts that are held free in the air. A clearance not less than 25 mm (1 in.) shall be secured between bare current-carrying metal parts and any metal surface. Adequate provisions shall be made for the expansion and contraction of busbars. [366.100(E)](https://2023.antflix.net#366.100(E))
|
https://2023.antflix.net#366.100(E)
|
Chapter 3 Wiring Methods and Materials
|
366.120(A)
|
Nonmetallic auxiliary gutters installed outdoors shall have the following markings: Suitable for exposure to sunlightSuitable for use in wet locationsInstalled conductor insulation temperature rating [366.120(A)](https://2023.antflix.net#366.120(A))
|
https://2023.antflix.net#366.120(A)
|
Chapter 3 Wiring Methods and Materials
|
366.120(B)
|
Nonmetallic auxiliary gutters installed indoors shall be marked with the installed conductor insulation temperature rating. [366.120(B)](https://2023.antflix.net#366.120(B))
|
https://2023.antflix.net#366.120(B)
|
Chapter 3 Wiring Methods and Materials
|
368.1
|
This article covers service-entrance, feeder, and branch-circuit busways and associated fittings. [368.1](https://2023.antflix.net#368.1)
|
https://2023.antflix.net#368.1
|
Chapter 3 Wiring Methods and Materials
|
368.10
|
Busways shall be permitted to be installed where they are located in accordance with 368.10(A) through (C). Informational Note: See 300.21 for information concerning the spread of fire or products of combustion. [368.10](https://2023.antflix.net#368.10)
|
https://2023.antflix.net#368.10
|
Chapter 3 Wiring Methods and Materials
|
368.10(A)
|
Busways shall be permitted to be located in the open where visible, except as permitted in 368.10(C). [368.10(A)](https://2023.antflix.net#368.10(A))
|
https://2023.antflix.net#368.10(A)
|
Chapter 3 Wiring Methods and Materials
|
368.10(B)
|
Busways shall be permitted to be installed behind access panels, provided the busways are totally enclosed, of nonventilating-type construction, and installed so that the joints between sections and at fittings are accessible for maintenance purposes. Where installed behind access panels, means of access shall be provided, and either of the following conditions shall be met: The space behind the access panels shall not be used for air-handling purposes.Where the space behind the access panels is used for environmental air, other than ducts and plenums, there shall be no provisions for plug-in connections, and the conductors shall be insulated. [368.10(B)](https://2023.antflix.net#368.10(B))
|
https://2023.antflix.net#368.10(B)
|
Chapter 3 Wiring Methods and Materials
|
368.10(C)
|
Busways shall be permitted to be installed through walls or floors in accordance with 368.10(C)(1) and (C)(2). [368.10(C)](https://2023.antflix.net#368.10(C))
|
https://2023.antflix.net#368.10(C)
|
Chapter 3 Wiring Methods and Materials
|
368.10(C)(1)
|
Unbroken lengths of busway shall be permitted to be extended through dry walls. [368.10(C)(1)](https://2023.antflix.net#368.10(C)(1))
|
https://2023.antflix.net#368.10(C)(1)
|
Chapter 3 Wiring Methods and Materials
|
368.10(C)(2)
|
Floor penetrations shall comply with 368.10(C)(2)(a) and (C)(2)(b). Busways shall be permitted to be extended vertically through dry floors if totally enclosed (unventilated) where passing through and for a minimum distance of 1.8 m (6 ft) above the floor to provide adequate protection from physical damage.In other than industrial establishments, where a vertical riser penetrates two or more dry floors, a minimum 100-mm (4-in.) high curb shall be installed around all floor openings for riser busways to prevent liquids from entering the opening. The curb shall be installed within 300 mm (12 in.) of the floor opening. Electrical equipment shall be located so that it will not be damaged by liquids that are retained by the curb. [368.10(C)(2)](https://2023.antflix.net#368.10(C)(2))
|
https://2023.antflix.net#368.10(C)(2)
|
Chapter 3 Wiring Methods and Materials
|
368.12(A)
|
Busways shall not be installed where subject to severe physical damage or corrosive vapors. [368.12(A)](https://2023.antflix.net#368.12(A))
|
https://2023.antflix.net#368.12(A)
|
Chapter 3 Wiring Methods and Materials
|
368.12(B)
|
Busways shall not be installed in hoistways. [368.12(B)](https://2023.antflix.net#368.12(B))
|
https://2023.antflix.net#368.12(B)
|
Chapter 3 Wiring Methods and Materials
|
368.12(C)
|
Busways shall not be installed in any hazardous (classified) location, unless specifically approved for such use. Informational Note: See 501.10(B). [368.12(C)](https://2023.antflix.net#368.12(C))
|
https://2023.antflix.net#368.12(C)
|
Chapter 3 Wiring Methods and Materials
|
368.12(D)
|
Busways shall not be installed outdoors or in wet or damp locations unless identified for such use. [368.12(D)](https://2023.antflix.net#368.12(D))
|
https://2023.antflix.net#368.12(D)
|
Chapter 3 Wiring Methods and Materials
|
368.12(E)
|
Lighting busway and trolley busway shall not be installed less than 2.5 m (8 ft) above the floor or working platform unless provided with an identified cover. [368.12(E)](https://2023.antflix.net#368.12(E))
|
https://2023.antflix.net#368.12(E)
|
Chapter 3 Wiring Methods and Materials
|
368.17
|
Overcurrent protection shall be provided in accordance with 368.17(A) through (D). [368.17](https://2023.antflix.net#368.17)
|
https://2023.antflix.net#368.17
|
Chapter 3 Wiring Methods and Materials
|
368.17(A)
|
A busway shall be protected against overcurrent in accordance with the current rating of the busway. Exception No. 1: The applicable provisions of 240.4 shall be permitted. Exception No. 2: Where used as transformer secondary ties, 450.6(A)(3) shall be permitted. [368.17(A)](https://2023.antflix.net#368.17(A))
|
https://2023.antflix.net#368.17(A)
|
Chapter 3 Wiring Methods and Materials
|
368.17(B)
|
Overcurrent protection shall be required where busways are reduced in ampacity. Exception: For industrial establishments only, omission of overcurrent protection shall be permitted at points where busways are reduced in ampacity, provided that the length of the busway having the smaller ampacity does not exceed 15 m (50 ft) and has an ampacity at least equal to one-third the rating or setting of the overcurrent device next back on the line, and provided that such busway is free from contact with combustible material. [368.17(B)](https://2023.antflix.net#368.17(B))
|
https://2023.antflix.net#368.17(B)
|
Chapter 3 Wiring Methods and Materials
|
368.17(C)
|
Where a busway is used as a feeder, devices or plug-in connections for tapping off feeder or branch circuits from the busway shall contain the overcurrent devices required for the protection of the feeder or branch circuits. The plug-in device shall consist of an externally operable circuit breaker or an externally operable fusible switch. Where such devices are mounted out of reach and contain disconnecting means, suitable means such as ropes, chains, or sticks shall be provided for operating the disconnecting means from the floor. Exception No. 1: As permitted in 240.21. Exception No. 2: For fixed or semifixed luminaires, where the branch-circuit overcurrent device is part of the luminaire cord plug on cord-connected luminaires. Exception No. 3: Where luminaires without cords are plugged directly into the busway and the overcurrent device is mounted on the luminaire. Exception No. 4: Where the branch-circuit overcurrent plug-in device is directly supplying a readily accessible disconnect, a method of floor operation shall not be required. [368.17(C)](https://2023.antflix.net#368.17(C))
|
https://2023.antflix.net#368.17(C)
|
Chapter 3 Wiring Methods and Materials
|
368.17(D)
|
A busway used as a branch circuit shall be protected against overcurrent in accordance with 210.20. [368.17(D)](https://2023.antflix.net#368.17(D))
|
https://2023.antflix.net#368.17(D)
|
Chapter 3 Wiring Methods and Materials
|
368.30
|
Busways shall be securely supported at intervals not exceeding 1.5 m (5 ft) unless otherwise designed and marked. [368.30](https://2023.antflix.net#368.30)
|
https://2023.antflix.net#368.30
|
Chapter 3 Wiring Methods and Materials
|
368.56
|
Branches from busways shall be permitted to be made in accordance with 368.56(A), (B), and (C). [368.56](https://2023.antflix.net#368.56)
|
https://2023.antflix.net#368.56
|
Chapter 3 Wiring Methods and Materials
|
368.56(A)
|
Branches from busways shall be permitted to use any of the following wiring methods: Type AC armored cableType MC metal-clad cableType MI mineral-insulated, metal-sheathed cableIMC intermediate metal conduitRMC rigid metal conduitFMC flexible metal conduitLFMC liquidtight flexible metal conduitPVC rigid polyvinyl chloride conduitRTRC reinforced thermosetting resin conduitLFNC liquidtight flexible nonmetallic conduitEMT electrical metallic tubingENT electrical nonmetallic tubingBuswaysStrut-type channel racewaySurface metal racewaySurface nonmetallic racewayWhere a separate equipment grounding conductor is used, connection of the equipment grounding conductor to the busway shall comply with 250.8 and 250.12. [368.56(A)](https://2023.antflix.net#368.56(A))
|
https://2023.antflix.net#368.56(A)
|
Chapter 3 Wiring Methods and Materials
|
368.56(B)
|
Suitable cord and cable assemblies identified for extra-hard usage or hard usage and listed bus drop cable shall be permitted as branches from busways for the connection of portable equipment or the connection of stationary equipment to facilitate their interchange in accordance with 400.10 and 400.12 and the following conditions: The cord or cable shall be attached to the building by an approved means.The length of the cord or cable from a busway plug-in device to a suitable tension take-up support device shall not exceed 1.8 m (6 ft).The cord and cable shall be installed as a vertical riser from the tension take-up support device to the equipment served.Strain relief cable grips shall be provided for the cord or cable at the busway plug-in device and equipment terminations.Exception to (B)(2): In industrial establishments only, where the conditions of maintenance and supervision ensure that only qualified persons service the installation, lengths exceeding 1.8 m (6 ft) shall be permitted between the busway plug-in device and the tension take-up support device where the cord or cable is supported at intervals not exceeding 2.5 m (8 ft). [368.56(B)](https://2023.antflix.net#368.56(B))
|
https://2023.antflix.net#368.56(B)
|
Chapter 3 Wiring Methods and Materials
|
368.56(C)
|
Suitable cord and cable assemblies identified for extra-hard usage or hard usage and listed bus drop cable shall be permitted as branches from trolley-type busways for the connection of movable equipment in accordance with 400.10 and 400.12. [368.56(C)](https://2023.antflix.net#368.56(C))
|
https://2023.antflix.net#368.56(C)
|
Chapter 3 Wiring Methods and Materials
|
368.58
|
A dead end of a busway shall be closed. [368.58](https://2023.antflix.net#368.58)
|
https://2023.antflix.net#368.58
|
Chapter 3 Wiring Methods and Materials
|
368.60
|
Busway shall be connected to an equipment grounding conductor(s), to an equipment bonding jumper, or to the grounded conductor where permitted or required by 250.92(B)(1) or 250.142. [368.60](https://2023.antflix.net#368.60)
|
https://2023.antflix.net#368.60
|
Chapter 3 Wiring Methods and Materials
|
368.120
|
Busways shall be marked with the voltage and current rating for which they are designed, and with the manufacturer's name or trademark in such a manner as to be visible after installation. [368.120](https://2023.antflix.net#368.120)
|
https://2023.antflix.net#368.120
|
Chapter 3 Wiring Methods and Materials
|
368.214
|
Metal-enclosed busways shall be installed so that temperature rise from induced circulating currents in adjacent ferrous metal parts will not be hazardous to personnel or constitute a fire hazard. [368.214](https://2023.antflix.net#368.214)
|
https://2023.antflix.net#368.214
|
Chapter 3 Wiring Methods and Materials
|
368.234(A)
|
Busway runs that have sections located both inside and outside of buildings shall have a vapor seal at the building wall to prevent interchange of air between indoor and outdoor sections. Exception: Vapor seals shall not be required in forced-cooled bus. [368.234(A)](https://2023.antflix.net#368.234(A))
|
https://2023.antflix.net#368.234(A)
|
Chapter 3 Wiring Methods and Materials
|
368.234(B)
|
Fire barriers shall be provided where fire walls, floors, or ceilings are penetrated. Informational Note: See 300.21 for information concerning the spread of fire or products of combustion. [368.234(B)](https://2023.antflix.net#368.234(B))
|
https://2023.antflix.net#368.234(B)
|
Chapter 3 Wiring Methods and Materials
|
368.236
|
Drain plugs, filter drains, or similar methods shall be provided to remove condensed moisture from low points in busway run. [368.236](https://2023.antflix.net#368.236)
|
https://2023.antflix.net#368.236
|
Chapter 3 Wiring Methods and Materials
|
368.237
|
Ventilated busway enclosures shall be installed in accordance with Article 110, Part III, and 495.24. [368.237](https://2023.antflix.net#368.237)
|
https://2023.antflix.net#368.237
|
Chapter 3 Wiring Methods and Materials
|
368.238
|
Where bus enclosures terminate at machines cooled by flammable gas, seal-off bushings, baffles, or other means shall be provided to prevent accumulation of flammable gas in the busway enclosures. All conductor termination and connection hardware shall be accessible for installation, connection, and maintenance. [368.238](https://2023.antflix.net#368.238)
|
https://2023.antflix.net#368.238
|
Chapter 3 Wiring Methods and Materials
|
368.239
|
Switching devices or disconnecting links provided in the busway run shall have the same momentary rating as the busway. Disconnecting links shall be plainly marked to be removable only when bus is de-energized. Switching devices that are not load-break shall be interlocked to prevent operation under load, and disconnecting link enclosures shall be interlocked to prevent access to energized parts. [368.239](https://2023.antflix.net#368.239)
|
https://2023.antflix.net#368.239
|
Chapter 3 Wiring Methods and Materials
|
368.240
|
Secondary control devices and wiring that are provided as part of the metal-enclosed bus run shall be insulated by fire-retardant barriers from all primary circuit elements with the exception of short lengths of wire, such as at instrument transformer terminals. [368.240](https://2023.antflix.net#368.240)
|
https://2023.antflix.net#368.240
|
Chapter 3 Wiring Methods and Materials
|
368.244
|
Flexible or expansion connections shall be provided in long, straight runs of bus to allow for temperature expansion or contraction, or where the busway run crosses building vibration insulation joints. [368.244](https://2023.antflix.net#368.244)
|
https://2023.antflix.net#368.244
|
Chapter 3 Wiring Methods and Materials
|
368.258
|
Neutral bus, where required, shall be sized to carry all neutral load current, including harmonic currents, and shall have adequate momentary and short-circuit current rating consistent with system requirements. [368.258](https://2023.antflix.net#368.258)
|
https://2023.antflix.net#368.258
|
Chapter 3 Wiring Methods and Materials
|
368.260
|
Metal-enclosed busway shall be grounded. [368.260](https://2023.antflix.net#368.260)
|
https://2023.antflix.net#368.260
|
Chapter 3 Wiring Methods and Materials
|
368.320
|
Each busway run shall be provided with a permanent nameplate on which the following information shall be provided: Rated voltage.Rated continuous current; if bus is forced-cooled, both the normal forced-cooled rating and the self-cooled (not forced-cooled) rating for the same temperature rise shall be given.Rated frequency.Rated impulse withstand voltage.Rated 60-Hz withstand voltage (dry).Rated momentary current.Manufacturer's name or trademark.Informational Note: See IEEE C37.23-2015, IEEE Standard for Metal-Enclosed Bus, for construction and testing requirements for metal-enclosed bus assemblies. [368.320](https://2023.antflix.net#368.320)
|
https://2023.antflix.net#368.320
|
Chapter 3 Wiring Methods and Materials
|
369.1
|
This article covers the use, installation, and construction specifications for insulated bus pipe (IBP) systems. [369.1](https://2023.antflix.net#369.1)
|
https://2023.antflix.net#369.1
|
Chapter 3 Wiring Methods and Materials
|
369.2
|
IBP and IBP systems shall not be reconditioned. [369.2](https://2023.antflix.net#369.2)
|
https://2023.antflix.net#369.2
|
Chapter 3 Wiring Methods and Materials
|
369.6
|
IBP and IBP systems shall be listed. [369.6](https://2023.antflix.net#369.6)
|
https://2023.antflix.net#369.6
|
Chapter 3 Wiring Methods and Materials
|
369.10
|
IBP systems shall be permitted for use on power systems in accordance with the following: As exposed runs in accordance with 305.3.In wet or damp locations only when listed for such use.Installed through walls, in unbroken lengths. Where IBP penetrates an exterior wall, the entire length that penetrates the wall shall be listed for outdoor use, and the opening in the wall shall be sealed by an approved method.Extended vertically through dry floors if totally enclosed in metal where passing through the floor and for a minimum distance of 1.8 m (6 ft) above the floor to provide protection from physical damage.For voltages up to and including 35,000 volts ac nominal. [369.10](https://2023.antflix.net#369.10)
|
https://2023.antflix.net#369.10
|
Chapter 3 Wiring Methods and Materials
|
369.12
|
IBP systems shall not be used under the following conditions: In any hazardous (classified) location except as permitted by other articles in this CodeFor the support of luminaires or other equipmentWhere concealed by the building structureWhere accessible to other than qualified person(s) [369.12](https://2023.antflix.net#369.12)
|
https://2023.antflix.net#369.12
|
Chapter 3 Wiring Methods and Materials
|
369.14
|
IBP systems shall be installed by qualified persons. All documentation shall be available to the authority having jurisdiction. [369.14](https://2023.antflix.net#369.14)
|
https://2023.antflix.net#369.14
|
Chapter 3 Wiring Methods and Materials
|
369.20
|
Manufacturer's supplied terminating means shall be used for IBP system connections or terminations. Connections employing dissimilar metals shall be avoided to eliminate the possibility of galvanic action. 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. [369.20](https://2023.antflix.net#369.20)
|
https://2023.antflix.net#369.20
|
Chapter 3 Wiring Methods and Materials
|
369.80
|
IBP systems shall be used within the marked ampacity of the IBP. [369.80](https://2023.antflix.net#369.80)
|
https://2023.antflix.net#369.80
|
Chapter 3 Wiring Methods and Materials
|
369.90
|
IBP systems shall be used within the maximum rated conductor temperature. [369.90](https://2023.antflix.net#369.90)
|
https://2023.antflix.net#369.90
|
Chapter 3 Wiring Methods and Materials
|
369.100
|
The IBP conductor shall be aluminum or copper. The bus pipe shall be permitted to be solid or hollow. [369.100](https://2023.antflix.net#369.100)
|
https://2023.antflix.net#369.100
|
Chapter 3 Wiring Methods and Materials
|
369.110
|
Fire barriers shall be provided where fire walls, floors, or ceilings are penetrated. Informational Note: See 300.21 for information concerning the spread of fire or products of combustion. [369.110](https://2023.antflix.net#369.110)
|
https://2023.antflix.net#369.110
|
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