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Chapter 3 Wiring Methods and Materials
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326.116
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The conduit shall be a medium density polyethylene identified as suitable for use with natural gas rated pipe in metric designator 53, 78, or 103 (trade size 2, 3, or 4). The percent fill dimensions for the conduit are shown in Table 326.116. The size of the conduit permitted for each conductor size shall be calculated for a percent fill not to exceed those found in Table 1, Chapter 9. Table 326.116 Conduit Dimensions Conduit Size Actual Outside Diameter Actual Inside Diameter Metric Designator Trade Size mm in. mm in. 53 2 60 2.375 49.46 1.947 78 3 89 3.500 73.30 2.886 103 4 114 4.500 94.23 3.710 [326.116](https://2023.antflix.net#326.116)
|
https://2023.antflix.net#326.116
|
Chapter 3 Wiring Methods and Materials
|
326.120
|
The cable shall be marked in accordance with 310.8(A), (B)(1), and (D). [326.120](https://2023.antflix.net#326.120)
|
https://2023.antflix.net#326.120
|
Chapter 3 Wiring Methods and Materials
|
330.1
|
This article covers the use, installation, and construction specifications of metal-clad cable, Type MC. [330.1](https://2023.antflix.net#330.1)
|
https://2023.antflix.net#330.1
|
Chapter 3 Wiring Methods and Materials
|
330.6
|
Type MC cable shall be listed. Fittings used for connecting Type MC cable to boxes, cabinets, or other equipment shall be listed and identified for such use. [330.6](https://2023.antflix.net#330.6)
|
https://2023.antflix.net#330.6
|
Chapter 3 Wiring Methods and Materials
|
330.10(A)
|
Type MC cable shall be permitted as follows: For services, feeders, and branch circuits.For power, lighting, control, and signal circuits.Indoors or outdoors.Exposed or concealed.To be direct buried where identified for such use.In cable tray where identified for such use.In any raceway.As aerial cable on a messenger.In hazardous (classified) locations where specifically permitted by other articles in this Code.In dry locations and embedded in plaster finish on brick or other masonry except in damp or wet locations.In damp or wet locations where a corrosion-resistant jacket is provided over the metallic covering and any of the following conditions are met:The metallic covering is impervious to moisture.A jacket resistant to moisture is provided under the metal covering.The insulated conductors under the metallic covering are listed for use in wet locations.Where single-conductor cables are used, all phase conductors and, where used, the grounded conductor shall be grouped together to minimize induced voltage on the sheath. [330.10(A)](https://2023.antflix.net#330.10(A))
|
https://2023.antflix.net#330.10(A)
|
Chapter 3 Wiring Methods and Materials
|
330.10(B)
|
Type MC cable shall be permitted to be installed in compliance with Parts II and III of Article 725 and 770.133 as applicable and in accordance with 330.10(B)(1) through (B)(4). Informational Note: The "Uses Permitted" is not an all-inclusive list. [330.10(B)](https://2023.antflix.net#330.10(B))
|
https://2023.antflix.net#330.10(B)
|
Chapter 3 Wiring Methods and Materials
|
330.10(B)(1)
|
Type MC cable installed in cable tray shall comply with 392.10, 392.12, 392.18, 392.20, 392.22, 392.30, 392.46, 392.56, 392.60(C), and 392.80. [330.10(B)(1)](https://2023.antflix.net#330.10(B)(1))
|
https://2023.antflix.net#330.10(B)(1)
|
Chapter 3 Wiring Methods and Materials
|
330.10(B)(2)
|
Direct-buried cable shall comply with 300.5 or 305.15, as appropriate. [330.10(B)(2)](https://2023.antflix.net#330.10(B)(2))
|
https://2023.antflix.net#330.10(B)(2)
|
Chapter 3 Wiring Methods and Materials
|
330.10(B)(3)
|
Type MC cable installed as service-entrance cable shall be permitted in accordance with 230.43. [330.10(B)(3)](https://2023.antflix.net#330.10(B)(3))
|
https://2023.antflix.net#330.10(B)(3)
|
Chapter 3 Wiring Methods and Materials
|
330.10(B)(4)
|
Type MC cable installed outside of buildings or structures or as aerial cable shall comply with 225.10, 396.10, and 396.12. [330.10(B)(4)](https://2023.antflix.net#330.10(B)(4))
|
https://2023.antflix.net#330.10(B)(4)
|
Chapter 3 Wiring Methods and Materials
|
330.12
|
Type MC cable shall not be used under either of the following conditions: Where subject to physical damageWhere exposed to any of the destructive corrosive conditions in (a) or (b), unless the metallic sheath or armor is resistant to the conditions or is protected by material resistant to the conditions:Direct buried in the earth or embedded in concrete unless identified for direct burialExposed to cinder fills, strong chlorides, caustic alkalis, or vapors of chlorine or of hydrochloric acids [330.12](https://2023.antflix.net#330.12)
|
https://2023.antflix.net#330.12
|
Chapter 3 Wiring Methods and Materials
|
330.15
|
Exposed runs of cable, except as provided in 300.11(B), shall closely follow the surface of the building finish or of running boards. Exposed runs shall also be permitted to be installed on the underside of joists where supported at each joist and located so as not to be subject to physical damage. [330.15](https://2023.antflix.net#330.15)
|
https://2023.antflix.net#330.15
|
Chapter 3 Wiring Methods and Materials
|
330.17
|
Type MC cable shall be protected in accordance with 300.4(A), (C), and (D) where installed through or parallel to framing members. [330.17](https://2023.antflix.net#330.17)
|
https://2023.antflix.net#330.17
|
Chapter 3 Wiring Methods and Materials
|
330.23
|
The installation of Type MC cable in accessible attics or roof spaces shall also comply with 320.23. [330.23](https://2023.antflix.net#330.23)
|
https://2023.antflix.net#330.23
|
Chapter 3 Wiring Methods and Materials
|
330.24
|
Bends in Type MC cable shall be so made that the cable will not be damaged. The radius of the curve of the inner edge of any bend shall not be less than required in 330.24(A) through (C). [330.24](https://2023.antflix.net#330.24)
|
https://2023.antflix.net#330.24
|
Chapter 3 Wiring Methods and Materials
|
330.24(A)
|
Ten times the external diameter of the metallic sheath for cable not more than 19 mm (3/4 in.) in external diameterTwelve times the external diameter of the metallic sheath for cable more than 19 mm (3/4 in.) but not more than 38 mm (11/2 in.) in external diameterFifteen times the external diameter of the metallic sheath for cable more than 38 mm (11/2 in.) in external diameter [330.24(A)](https://2023.antflix.net#330.24(A))
|
https://2023.antflix.net#330.24(A)
|
Chapter 3 Wiring Methods and Materials
|
330.24(B)
|
Seven times the external diameter of the metallic sheath. [330.24(B)](https://2023.antflix.net#330.24(B))
|
https://2023.antflix.net#330.24(B)
|
Chapter 3 Wiring Methods and Materials
|
330.24(C)
|
Twelve times the overall diameter of one of the individual conductors or seven times the overall diameter of the multiconductor cable, whichever is greater. [330.24(C)](https://2023.antflix.net#330.24(C))
|
https://2023.antflix.net#330.24(C)
|
Chapter 3 Wiring Methods and Materials
|
330.30(A)
|
Type MC cable shall be supported and secured by staples; cable ties listed and identified for securement and support; straps, hangers, or similar fittings; or other approved means designed and installed so as not to damage the cable. Type MC cable fittings shall be permitted as a means of cable support. [330.30(A)](https://2023.antflix.net#330.30(A))
|
https://2023.antflix.net#330.30(A)
|
Chapter 3 Wiring Methods and Materials
|
330.30(B)
|
Unless otherwise permitted in this Code, cables shall be secured at intervals not exceeding 1.8 m (6 ft). Cables containing four or fewer conductors sized no larger than 10 AWG shall be secured within 300 mm (12 in.) of every box, cabinet, fitting, or other cable termination. In vertical installations, listed cables with ungrounded conductors 250 kcmil and larger shall be permitted to be secured at intervals not exceeding 3 m (10 ft). [330.30(B)](https://2023.antflix.net#330.30(B))
|
https://2023.antflix.net#330.30(B)
|
Chapter 3 Wiring Methods and Materials
|
330.30(C)
|
Unless otherwise permitted in this Code, cables shall be supported at intervals not exceeding 1.8 m (6 ft). Horizontal runs of Type MC cable installed in wooden or metal framing members or similar supporting means shall be considered supported and secured where such support does not exceed 1.8 m (6 ft) intervals. [330.30(C)](https://2023.antflix.net#330.30(C))
|
https://2023.antflix.net#330.30(C)
|
Chapter 3 Wiring Methods and Materials
|
330.30(D)
|
Type MC cable shall be permitted to be unsupported and unsecured where the cable complies with any of the following: Is fished between access points through concealed spaces in finished buildings or structures and supporting is impracticalIs not more than 1.8 m (6 ft) in length from the last point of cable support to the point of connection to luminaires or other electrical equipment and the cable and point of connection are within an accessible ceilingIs Type MC of the interlocked armor type in lengths not exceeding 900 mm (3 ft) from the last point where it is securely fastened and is used to connect equipment where flexibility is necessary to minimize the transmission of vibration from equipment or to provide flexibility for equipment that requires movement after installation [330.30(D)](https://2023.antflix.net#330.30(D))
|
https://2023.antflix.net#330.30(D)
|
Chapter 3 Wiring Methods and Materials
|
330.31
|
Where single-conductor cables with a nonferrous armor or sheath are used, the installation shall comply with 300.20. [330.31](https://2023.antflix.net#330.31)
|
https://2023.antflix.net#330.31
|
Chapter 3 Wiring Methods and Materials
|
330.80
|
The ampacity of Type MC cable shall be determined in accordance with 310.14 or 315.60 for 14 AWG and larger conductors and in accordance with Table 402.5 for 18 AWG and 16 AWG conductors. The installation shall not exceed the temperature ratings of terminations and equipment. [330.80](https://2023.antflix.net#330.80)
|
https://2023.antflix.net#330.80
|
Chapter 3 Wiring Methods and Materials
|
330.80(A)
|
The ampacities for Type MC cable installed in cable tray shall be determined in accordance with 392.80. [330.80(A)](https://2023.antflix.net#330.80(A))
|
https://2023.antflix.net#330.80(A)
|
Chapter 3 Wiring Methods and Materials
|
330.80(B)
|
Where single Type MC conductors are grouped together in a triangular or square configuration and installed on a messenger or exposed with a maintained free airspace of not less than 2.15 times one conductor diameter (2.15 × O.D.) of the largest conductor contained within the configuration and adjacent conductor configurations or cables, the ampacity of the conductors shall not exceed the allowable ampacities in the following tables: Table 310.20 for conductors rated 0 volts through 2000 voltsTable 315.60(C)(1) and Table 315.60(C)(2) for conductors rated over 2000 volts [330.80(B)](https://2023.antflix.net#330.80(B))
|
https://2023.antflix.net#330.80(B)
|
Chapter 3 Wiring Methods and Materials
|
330.80(C)
|
Where more than two Type MC cables containing two or more current-carrying conductors in each cable are installed in contact with thermal insulation, caulk, or sealing foam without maintaining spacing between cables, the ampacity of each conductor shall be adjusted in accordance with Table 310.15(C)(1). [330.80(C)](https://2023.antflix.net#330.80(C))
|
https://2023.antflix.net#330.80(C)
|
Chapter 3 Wiring Methods and Materials
|
330.104
|
For ungrounded, grounded, and equipment grounding conductors, the minimum conductor sizes shall be 14 AWG copper, nickel, or nickel-coated copper and 12 AWG aluminum or copper-clad aluminum. For control and signal conductors, minimum conductor sizes shall be 18 AWG copper, nickel, or nickel-coated copper, 14 AWG copper-clad aluminum, and 12 AWG aluminum. [330.104](https://2023.antflix.net#330.104)
|
https://2023.antflix.net#330.104
|
Chapter 3 Wiring Methods and Materials
|
330.108
|
Where Type MC cable is used to provide an equipment grounding conductor, it shall comply with 250.118(A)(10) and 250.122. [330.108](https://2023.antflix.net#330.108)
|
https://2023.antflix.net#330.108
|
Chapter 3 Wiring Methods and Materials
|
330.112
|
Insulated conductors shall comply with 330.112(A) or (B). [330.112](https://2023.antflix.net#330.112)
|
https://2023.antflix.net#330.112
|
Chapter 3 Wiring Methods and Materials
|
330.112(A)
|
Insulated control and signal conductors in sizes 18 AWG and 16 AWG shall be of a type listed in Table 402.3, with a maximum operating temperature not less than 90°C (194°F) and as permitted by 724.49. Ungrounded, grounded, and equipment grounding conductors 16 AWG and larger shall be of a type listed in Table 310.4(1) or of a type identified for use in Type MC cable. [330.112(A)](https://2023.antflix.net#330.112(A))
|
https://2023.antflix.net#330.112(A)
|
Chapter 3 Wiring Methods and Materials
|
330.112(B)
|
Insulated conductors shall be of a type listed in Table 310.4(2) and Table 315.10(A). [330.112(B)](https://2023.antflix.net#330.112(B))
|
https://2023.antflix.net#330.112(B)
|
Chapter 3 Wiring Methods and Materials
|
330.116
|
Metallic covering shall be one of the following types: smooth metallic sheath, corrugated metallic sheath, or interlocking metal tape armor. The metallic sheath shall be continuous and close fitting. A nonmagnetic sheath or armor shall be used on single conductor Type MC. Supplemental protection of an outer covering of corrosion-resistant material shall be permitted and shall be required where such protection is needed. The sheath shall not be used as a current-carrying conductor. Informational Note: See 300.6 for protection against corrosion. [330.116](https://2023.antflix.net#330.116)
|
https://2023.antflix.net#330.116
|
Chapter 3 Wiring Methods and Materials
|
330.130
|
Where required to be marked MC-HL, the cable shall be listed and shall have a gas/vapor tight continuous corrugated metallic sheath, an overall jacket of suitable polymeric material, and a separate equipment grounding conductor. [330.130](https://2023.antflix.net#330.130)
|
https://2023.antflix.net#330.130
|
Chapter 3 Wiring Methods and Materials
|
332.1
|
This article covers the use, installation, and construction specifications for mineral-insulated, metal-sheathed cable, Type MI. [332.1](https://2023.antflix.net#332.1)
|
https://2023.antflix.net#332.1
|
Chapter 3 Wiring Methods and Materials
|
332.6
|
Type MI cable and associated fittings shall be listed. [332.6](https://2023.antflix.net#332.6)
|
https://2023.antflix.net#332.6
|
Chapter 3 Wiring Methods and Materials
|
332.10
|
Type MI cable shall be permitted as follows: For services, feeders, and branch circuitsFor power, lighting, control, and signal circuitsIn dry, wet, or continuously moist locationsIndoors or outdoorsWhere exposed or concealedWhere embedded in plaster, concrete, fill, or other masonry, whether above or below gradeIn hazardous (classified) locations where specifically permitted by other articles in this CodeWhere exposed to oil and gasolineWhere exposed to corrosive conditions not deteriorating to its sheathIn underground runs where suitably protected against physical damage and corrosive conditionsIn or attached to cable trayInformational Note: The "Uses Permitted" is not an all-inclusive list. [332.10](https://2023.antflix.net#332.10)
|
https://2023.antflix.net#332.10
|
Chapter 3 Wiring Methods and Materials
|
332.12
|
Type MI cable shall not be used under the following conditions or in the following locations: In underground runs unless protected from physical damage, where necessaryWhere exposed to conditions that are destructive and corrosive to the metallic sheath, unless additional protection is provided [332.12](https://2023.antflix.net#332.12)
|
https://2023.antflix.net#332.12
|
Chapter 3 Wiring Methods and Materials
|
332.17
|
Type MI cable shall be protected in accordance with 300.4 where installed through or parallel to framing members. [332.17](https://2023.antflix.net#332.17)
|
https://2023.antflix.net#332.17
|
Chapter 3 Wiring Methods and Materials
|
332.24
|
Bends in Type MI cable shall be so made that the cable will not be damaged. The radius of the inner edge of any bend shall not be less than required as follows: Five times the external diameter of the metallic sheath for cable not more than 19 mm (3/4 in.) in external diameterTen times the external diameter of the metallic sheath for cable greater than 19 mm (3/4 in.) but not more than 25 mm (1 in.) in external diameter [332.24](https://2023.antflix.net#332.24)
|
https://2023.antflix.net#332.24
|
Chapter 3 Wiring Methods and Materials
|
332.30
|
Type MI cable shall be supported and secured by staples, straps, hangers, or similar fittings, designed and installed so as not to damage the cable, at intervals not exceeding 1.8 m (6 ft). [332.30](https://2023.antflix.net#332.30)
|
https://2023.antflix.net#332.30
|
Chapter 3 Wiring Methods and Materials
|
332.30(A)
|
In other than vertical runs, cables installed in accordance with 300.4 shall be considered supported and secured where such support does not exceed 1.8 m (6 ft) intervals. [332.30(A)](https://2023.antflix.net#332.30(A))
|
https://2023.antflix.net#332.30(A)
|
Chapter 3 Wiring Methods and Materials
|
332.30(B)
|
Type MI cable shall be permitted to be unsupported where the cable is fished between access points through concealed spaces in finished buildings or structures and supporting is impracticable. [332.30(B)](https://2023.antflix.net#332.30(B))
|
https://2023.antflix.net#332.30(B)
|
Chapter 3 Wiring Methods and Materials
|
332.30(C)
|
All MI cable installed in cable trays shall comply with 392.30(A). [332.30(C)](https://2023.antflix.net#332.30(C))
|
https://2023.antflix.net#332.30(C)
|
Chapter 3 Wiring Methods and Materials
|
332.31
|
Where single-conductor cables are used, all phase conductors and, where used, the neutral conductor shall be grouped together to minimize induced voltage on the sheath. [332.31](https://2023.antflix.net#332.31)
|
https://2023.antflix.net#332.31
|
Chapter 3 Wiring Methods and Materials
|
332.40(A)
|
Fittings used for connecting Type MI cable to boxes, cabinets, or other equipment shall be identified for such use. [332.40(A)](https://2023.antflix.net#332.40(A))
|
https://2023.antflix.net#332.40(A)
|
Chapter 3 Wiring Methods and Materials
|
332.40(B)
|
Where Type MI cable terminates, an end seal fitting shall be installed immediately after stripping to prevent the entrance of moisture into the insulation. The conductors extending beyond the sheath shall be individually provided with an insulating material. [332.40(B)](https://2023.antflix.net#332.40(B))
|
https://2023.antflix.net#332.40(B)
|
Chapter 3 Wiring Methods and Materials
|
332.80
|
The ampacity of Type MI cable shall be determined in accordance with 310.14. The conductor temperature at the end seal fitting shall not exceed the temperature rating of the listed end seal fitting, and the installation shall not exceed the temperature ratings of terminations or equipment. [332.80](https://2023.antflix.net#332.80)
|
https://2023.antflix.net#332.80
|
Chapter 3 Wiring Methods and Materials
|
332.80(A)
|
The ampacities for Type MI cable installed in cable tray shall be determined in accordance with 392.80(A). [332.80(A)](https://2023.antflix.net#332.80(A))
|
https://2023.antflix.net#332.80(A)
|
Chapter 3 Wiring Methods and Materials
|
332.80(B)
|
Where single Type MI conductors are grouped together in a triangular or square configuration, as required by 332.31, and installed on a messenger or exposed with a maintained free air space of not less than 2.15 times one conductor diameter (2.15 × O.D.) of the largest conductor contained within the configuration and adjacent conductor configurations or cables, the ampacity of the conductors shall not exceed the allowable ampacities of Table 310.17. [332.80(B)](https://2023.antflix.net#332.80(B))
|
https://2023.antflix.net#332.80(B)
|
Chapter 3 Wiring Methods and Materials
|
332.104
|
Type Ml cable conductors shall be of solid copper, nickel, or nickel-coated copper with a resistance corresponding to standard AWG and kcmil sizes. [332.104](https://2023.antflix.net#332.104)
|
https://2023.antflix.net#332.104
|
Chapter 3 Wiring Methods and Materials
|
332.108
|
Where the outer sheath is made of copper, it shall provide an adequate path to serve as an equipment grounding conductor. Where the outer sheath is made of steel, a separate equipment grounding conductor shall be provided. [332.108](https://2023.antflix.net#332.108)
|
https://2023.antflix.net#332.108
|
Chapter 3 Wiring Methods and Materials
|
332.112
|
The conductor insulation in Type MI cable shall be a highly compressed refractory mineral that provides proper spacing for all conductors. [332.112](https://2023.antflix.net#332.112)
|
https://2023.antflix.net#332.112
|
Chapter 3 Wiring Methods and Materials
|
332.116
|
The outer sheath shall be of a continuous construction to provide mechanical protection and moisture seal. [332.116](https://2023.antflix.net#332.116)
|
https://2023.antflix.net#332.116
|
Chapter 3 Wiring Methods and Materials
|
334.1
|
This article covers the use, installation, and construction specifications of nonmetallic-sheathed cable. [334.1](https://2023.antflix.net#334.1)
|
https://2023.antflix.net#334.1
|
Chapter 3 Wiring Methods and Materials
|
334.6
|
Type NM and Type NMC cables and associated fittings shall be listed. [334.6](https://2023.antflix.net#334.6)
|
https://2023.antflix.net#334.6
|
Chapter 3 Wiring Methods and Materials
|
334.10
|
Type NM and Type NMC cables shall be permitted to be used in the following, except as prohibited in 334.12: One- and two-family dwellings and their attached or detached garages, and their storage buildings.Multi-family dwellings and their detached garages permitted to be of Types III, IV, and V construction.Other structures permitted to be of Types III, IV, and V construction. Cables shall be concealed within walls, floors, or ceilings that provide a thermal barrier of material that has at least a 15-minute finish rating as identified in listings of fire-rated assemblies.Informational Note No. 1: See NFPA 220-2021, Standard on Types of Building Construction, or the applicable building code, or both for types of building construction and occupancy classification definitions.Informational Note No. 2: See Informative Annex E for determination of building types.Cable trays in structures permitted to be Types III, IV, or V where the cables are identified for the use.Informational Note No. 3: See 310.14(A)(3) for temperature limitation of conductors.Types I and II construction where installed within raceways permitted to be installed in Types I and II construction. [334.10](https://2023.antflix.net#334.10)
|
https://2023.antflix.net#334.10
|
Chapter 3 Wiring Methods and Materials
|
334.10(A)
|
Type NM cable shall be permitted as follows: For both exposed and concealed work in normally dry locations except as prohibited in 334.10(3)To be installed or fished in air voids in masonry block or tile walls [334.10(A)](https://2023.antflix.net#334.10(A))
|
https://2023.antflix.net#334.10(A)
|
Chapter 3 Wiring Methods and Materials
|
334.10(B)
|
Type NMC cable shall be permitted as follows: For both exposed and concealed work in dry, wet, damp, or corrosive locations, except as prohibited by 334.10(3)In outside and inside walls of masonry block or tileIn a shallow chase in masonry, concrete, or adobe protected against nails or screws by a steel plate at least 1.59 mm (1/16 in.) thick and covered with plaster, adobe, or similar finish [334.10(B)](https://2023.antflix.net#334.10(B))
|
https://2023.antflix.net#334.10(B)
|
Chapter 3 Wiring Methods and Materials
|
334.12(A)
|
Types NM and NMC cables shall not be permitted as follows: In any dwelling or structure not specifically permitted in 334.10(1), (2), (3), and (5)Exposed within a dropped or suspended ceiling cavity in other than one- and two-family and multifamily dwellingsAs service-entrance cableIn commercial garages having hazardous (classified) locations as defined in 511.3In theaters and similar locations, except where permitted in 518.4(C)In motion picture studiosIn storage battery roomsIn hoistways or on elevators or escalatorsEmbedded in poured cement, concrete, or aggregateIn hazardous (classified) locations, except where specifically permitted by other articles in this Code [334.12(A)](https://2023.antflix.net#334.12(A))
|
https://2023.antflix.net#334.12(A)
|
Chapter 3 Wiring Methods and Materials
|
334.12(B)
|
Type NM cables shall not be used under the following conditions or in the following locations: Where exposed to corrosive fumes or vaporsWhere embedded in masonry, concrete, adobe, fill, or plasterIn a shallow chase in masonry, concrete, or adobe and covered with plaster, adobe, or similar finishIn wet or damp locations [334.12(B)](https://2023.antflix.net#334.12(B))
|
https://2023.antflix.net#334.12(B)
|
Chapter 3 Wiring Methods and Materials
|
334.15
|
In exposed work, except as provided in 300.11(B), cable shall be installed as specified in 334.15(A) through (C). [334.15](https://2023.antflix.net#334.15)
|
https://2023.antflix.net#334.15
|
Chapter 3 Wiring Methods and Materials
|
334.15(A)
|
Cable shall closely follow the surface of the building finish or of running boards. [334.15(A)](https://2023.antflix.net#334.15(A))
|
https://2023.antflix.net#334.15(A)
|
Chapter 3 Wiring Methods and Materials
|
334.15(B)
|
Cable shall be protected from physical damage where necessary by rigid metal conduit, intermediate metal conduit, electrical metallic tubing, Schedule 80 PVC conduit, RTRC marked with the suffix -XW, or other approved means. Where passing through a floor, the cable shall be enclosed in rigid metal conduit, intermediate metal conduit, electrical metallic tubing, Schedule 80 PVC conduit, RTRC marked with the suffix -XW, or other approved means extending at least 150 mm (6 in.) above the floor. Conduit or tubing shall be provided with a bushing or adapter that provides protection from abrasion at the point the cable enters and exits the raceway. Type NMC cable installed in shallow chases or grooves in masonry, concrete, or adobe shall be protected in accordance with the requirements in 300.4(F) and covered with plaster, adobe, or similar finish. [334.15(B)](https://2023.antflix.net#334.15(B))
|
https://2023.antflix.net#334.15(B)
|
Chapter 3 Wiring Methods and Materials
|
334.15(C)
|
Where cable is run at angles with joists in unfinished basements and crawl spaces, it shall be permissible to secure cables not smaller than two 6 AWG or three 8 AWG conductors directly to the lower edges of the joists. Smaller cables shall be run either through bored holes in joists or on running boards. Nonmetallic-sheathed cable installed on the wall of an unfinished basement shall be permitted to be installed in a listed conduit or tubing or shall be protected in accordance with 300.4. Conduit or tubing shall be provided with a bushing or adapter that provides protection from abrasion at the point the cable enters and exits the raceway. The sheath of the nonmetallic-sheathed cable shall extend through the conduit or tubing and into the outlet, device, or junction box not less than 6 mm (1/4 in.). The cable shall be secured within 300 mm (12 in.) of the point where the cable enters the conduit or tubing. Metal conduit, tubing, and metal outlet boxes shall be connected to an equipment grounding conductor complying with 250.86 and 250.148. [334.15(C)](https://2023.antflix.net#334.15(C))
|
https://2023.antflix.net#334.15(C)
|
Chapter 3 Wiring Methods and Materials
|
334.17
|
Types NM and NMC cable shall be protected in accordance with 300.4 where installed through or parallel to framing members. Grommets used as required in 300.4(B)(1) shall remain in place and be listed for the purpose of cable protection. [334.17](https://2023.antflix.net#334.17)
|
https://2023.antflix.net#334.17
|
Chapter 3 Wiring Methods and Materials
|
334.19
|
The sheath on nonmetallic-sheathed cable shall extend not less than 6 mm (1/4 in.) beyond any cable clamp or cable entry. [334.19](https://2023.antflix.net#334.19)
|
https://2023.antflix.net#334.19
|
Chapter 3 Wiring Methods and Materials
|
334.23
|
The installation of cable in accessible attics or roof spaces shall also comply with 320.23. [334.23](https://2023.antflix.net#334.23)
|
https://2023.antflix.net#334.23
|
Chapter 3 Wiring Methods and Materials
|
334.24
|
Bends in Types NM and NMC cable shall be so made that the cable will not be damaged. The radius of the curve of the inner edge of any bend during or after installation shall not be less than five times the diameter of the cable. For flat cables, the major diameter dimension of the cable shall be used to determine the bending radius. [334.24](https://2023.antflix.net#334.24)
|
https://2023.antflix.net#334.24
|
Chapter 3 Wiring Methods and Materials
|
334.30
|
Nonmetallic-sheathed cable shall be supported and secured by staples, cable ties listed and identified for securement and support, or straps, hangers, or similar fittings designed and installed so as not to damage the cable, at intervals not exceeding 1.4 m (41/2 ft) and within 300 mm (12 in.) of every cable entry into enclosures such as outlet boxes, junction boxes, cabinets, or fittings. The cable length between the cable entry and the closest cable support shall not exceed 450 mm (18 in.). Flat cables shall not be stapled on edge. Sections of cable protected from physical damage by raceway shall not be required to be secured within the raceway. [334.30](https://2023.antflix.net#334.30)
|
https://2023.antflix.net#334.30
|
Chapter 3 Wiring Methods and Materials
|
334.30(A)
|
In other than vertical runs, cables installed in accordance with 300.4 shall be considered to be supported and secured where such support does not exceed 1.4-m (41/2-ft) intervals and the nonmetallic-sheathed cable is securely fastened in place by an approved means within 300 mm (12 in.) of each box, cabinet, conduit body, or other nonmetallic-sheathed cable termination. Informational Note: See 314.17(B)(1) for support where nonmetallic boxes are used. [334.30(A)](https://2023.antflix.net#334.30(A))
|
https://2023.antflix.net#334.30(A)
|
Chapter 3 Wiring Methods and Materials
|
334.30(B)
|
Nonmetallic-sheathed cable shall be permitted to be unsupported where the cable: Is fished between access points through concealed spaces in finished buildings or structures and supporting is impracticable.Is not more than 1.4 m (41/2 ft) from the last point of cable support to the point of connection to a luminaire or other piece of electrical equipment and the cable and point of connection are within an accessible ceiling in one-, two-, or multifamily dwellings. [334.30(B)](https://2023.antflix.net#334.30(B))
|
https://2023.antflix.net#334.30(B)
|
Chapter 3 Wiring Methods and Materials
|
334.30(C)
|
A wiring device identified for the use, without a separate outlet box, and incorporating an integral cable clamp shall be permitted where the cable is secured in place at intervals not exceeding 1.4 m (41/2 ft) and within 300 mm (12 in.) from the wiring device wall opening, and there shall be at least a 300 mm (12 in.) loop of unbroken cable or 150 mm (6 in.) of a cable end available on the interior side of the finished wall to permit replacement. [334.30(C)](https://2023.antflix.net#334.30(C))
|
https://2023.antflix.net#334.30(C)
|
Chapter 3 Wiring Methods and Materials
|
334.40(A)
|
Nonmetallic outlet boxes shall be permitted as provided by 314.3. [334.40(A)](https://2023.antflix.net#334.40(A))
|
https://2023.antflix.net#334.40(A)
|
Chapter 3 Wiring Methods and Materials
|
334.40(B)
|
Self-contained switches, self-contained receptacles, and listed nonmetallic-sheathed cable interconnector devices of insulating material that are listed for use without a box shall be permitted to be used without boxes in exposed or concealed installations. Openings in such devices shall form a close fit around the outer covering of the cable, and the device shall fully enclose the part of the cable from which any part of the covering has been removed. Where connections to conductors are by binding-screw terminals, there shall be available as many terminals as conductors. [334.40(B)](https://2023.antflix.net#334.40(B))
|
https://2023.antflix.net#334.40(B)
|
Chapter 3 Wiring Methods and Materials
|
334.40(C)
|
Wiring devices with integral enclosures identified for such use shall be permitted as provided by 300.15(E). [334.40(C)](https://2023.antflix.net#334.40(C))
|
https://2023.antflix.net#334.40(C)
|
Chapter 3 Wiring Methods and Materials
|
334.80
|
The ampacity of Types NM and NMC cable shall be determined in accordance with 310.14. The ampacity shall not exceed that of a 60°C (140°F) rated conductor. The 90°C (194°F) rating shall be permitted to be used for ampacity adjustment and correction calculations, provided the final calculated ampacity does not exceed that of a 60°C (140°F) rated conductor. The ampacity of Types NM and NMC cable installed in cable trays shall be determined in accordance with 392.80(A). Where more than two NM cables containing two or more current-carrying conductors are installed, without maintaining spacing between the cables, through the same opening in wood framing that is to be sealed with thermal insulation, caulk, or sealing foam, the ampacity of each conductor shall be adjusted in accordance with Table 310.15(C)(1) and 310.14(A)(2), Exception, shall not apply. Where more than two NM cables containing two or more current-carrying conductors are installed in contact with thermal insulation without maintaining spacing between cables, the ampacity of each conductor shall be adjusted in accordance with Table 310.15(C)(1) and 310.14(A)(2), Exception shall not apply. [334.80](https://2023.antflix.net#334.80)
|
https://2023.antflix.net#334.80
|
Chapter 3 Wiring Methods and Materials
|
334.100
|
The outer cable sheath of nonmetallic-sheathed cable shall be a nonmetallic material. [334.100](https://2023.antflix.net#334.100)
|
https://2023.antflix.net#334.100
|
Chapter 3 Wiring Methods and Materials
|
334.104
|
The 600-volt insulated power conductors shall be sizes 14 AWG through 2 AWG copper conductors or sizes 12 AWG through 2 AWG aluminum or copper-clad aluminum conductors. Control and signaling conductors shall be no smaller than 18 AWG copper. [334.104](https://2023.antflix.net#334.104)
|
https://2023.antflix.net#334.104
|
Chapter 3 Wiring Methods and Materials
|
334.108
|
In addition to the insulated conductors, the cable shall have an insulated, covered, or bare equipment grounding conductor. [334.108](https://2023.antflix.net#334.108)
|
https://2023.antflix.net#334.108
|
Chapter 3 Wiring Methods and Materials
|
334.112
|
The insulated power conductors shall be one of the types listed in Table 310.4(1) that are suitable for branch-circuit wiring or one that is identified for use in these cables. Conductor insulation shall be rated at 90°C (194°F). Informational Note: Types NM and NMC cable identified by the markings NM-B and NMC-B meet this requirement. [334.112](https://2023.antflix.net#334.112)
|
https://2023.antflix.net#334.112
|
Chapter 3 Wiring Methods and Materials
|
334.116
|
The outer sheath of nonmetallic-sheathed cable shall comply with 334.116(A) and (B). [334.116](https://2023.antflix.net#334.116)
|
https://2023.antflix.net#334.116
|
Chapter 3 Wiring Methods and Materials
|
334.116(A)
|
The overall covering shall be flame retardant and moisture resistant. [334.116(A)](https://2023.antflix.net#334.116(A))
|
https://2023.antflix.net#334.116(A)
|
Chapter 3 Wiring Methods and Materials
|
334.116(B)
|
The overall covering shall be flame retardant, moisture resistant, fungus resistant, and corrosion resistant. [334.116(B)](https://2023.antflix.net#334.116(B))
|
https://2023.antflix.net#334.116(B)
|
Chapter 3 Wiring Methods and Materials
|
335.1
|
This article covers the use, installation, and construction specifications of instrumentation tray cable (Type ITC) for application to instrumentation and control circuits operating at 150 volts or less and 5 amperes or less. [335.1](https://2023.antflix.net#335.1)
|
https://2023.antflix.net#335.1
|
Chapter 3 Wiring Methods and Materials
|
335.3
|
In addition to the provisions of this article, installation of Type ITC cable shall comply with other applicable articles of this Code. [335.3](https://2023.antflix.net#335.3)
|
https://2023.antflix.net#335.3
|
Chapter 3 Wiring Methods and Materials
|
335.4
|
Type ITC cable shall be permitted to be used as follows in industrial establishments where the conditions of maintenance and supervision ensure that only qualified persons service the installation: In cable trays.In raceways.In hazardous locations as permitted in 501.10, 502.10, 503.10, 504.20, 504.30, 504.80, and 505.15.Enclosed in a smooth metallic sheath, continuous corrugated metallic sheath, or interlocking tape armor applied over the nonmetallic sheath in accordance with 335.6. The cable shall be supported and secured at intervals not exceeding 1.8 m (6 ft).Cable, without a metallic sheath or armor, that complies with the crush and impact requirements of Type MC cable and is identified for such use with the marking ITC-ER shall be permitted to be installed exposed. The cable shall be continuously supported and protected against physical damage using mechanical protection such as dedicated struts, angles, or channels. The cable shall be secured at intervals not exceeding 1.8 m (6 ft).Exception to (5): Where not subject to physical damage, Type ITC-ER shall be permitted to transition between cable trays and between cable trays and utilization equipment or devices for a distance not to exceed 1.8 m (6 ft) without continuous support. The cable shall be mechanically supported where exiting the cable tray to ensure that the minimum bending radius is not exceeded.As aerial cable on a messenger.Direct buried where identified for the use.Under raised floors in rooms containing industrial process control equipment and rack rooms where arranged to prevent damage to the cable.Under raised floors in information technology equipment rooms in accordance with 645.5(E)(2). [335.4](https://2023.antflix.net#335.4)
|
https://2023.antflix.net#335.4
|
Chapter 3 Wiring Methods and Materials
|
335.5
|
Type ITC cable shall not be installed on circuits operating at more than 150 volts or more than 5 amperes. Installation of Type ITC cable with other cables shall be subject to the stated requirements of the specific articles for the other cables. Where the governing articles do not contain stated requirements for installation with Type ITC cable, the installation of Type ITC cable with the other cables shall not be permitted. Type ITC cable shall not be installed with power, lighting, Class 1 circuits that are not power limited, or non-power-limited circuits. Exception No. 1: Where terminated within equipment or junction boxes and separations are maintained by insulating barriers or other means. Exception No. 2: Where a metallic sheath or armor is applied over the nonmetallic sheath of the Type ITC cable. [335.5](https://2023.antflix.net#335.5)
|
https://2023.antflix.net#335.5
|
Chapter 3 Wiring Methods and Materials
|
335.6
|
The insulated conductors of Type ITC cable shall be in sizes 22 AWG through 12 AWG. The conductor material shall be copper or thermocouple alloy. Insulation on the conductors shall be rated for 300 volts. Shielding shall be permitted. The cable shall be listed as being resistant to the spread of fire. The outer jacket shall be sunlight and moisture resistant. Where a smooth metallic sheath, continuous corrugated metallic sheath, or interlocking tape armor is applied over the nonmetallic sheath, an overall nonmetallic jacket shall not be required. Informational Note: One method of defining resistant to the spread of fire is that the cables do not spread fire to the top of the tray in the UL flame exposure, vertical tray flame test in ANSI/UL 1685-2010, Vertical-Tray Fire-Propagation and Smoke-Release Test for Electrical and Optical-Fiber Cables. The smoke measurements in the test method are not applicable. Another method of defining resistant to the spread of fire is for the damage (char length) not to exceed 1.5 m (4 ft 11 in.) when performing the CSA vertical flame test - cables in cable trays, as described in CSA C22.2 No. 0.3-M-2001, Test Methods for Electrical Wires and Cables. [335.6](https://2023.antflix.net#335.6)
|
https://2023.antflix.net#335.6
|
Chapter 3 Wiring Methods and Materials
|
335.7
|
The cable shall be marked in accordance with 310.8(A)(2) through (A)(5). Voltage ratings shall not be marked on the cable. [335.7](https://2023.antflix.net#335.7)
|
https://2023.antflix.net#335.7
|
Chapter 3 Wiring Methods and Materials
|
335.8
|
The ampacity of the conductors shall be 5 amperes, except for 22 AWG conductors, which shall have an ampacity of 3 amperes. [335.8](https://2023.antflix.net#335.8)
|
https://2023.antflix.net#335.8
|
Chapter 3 Wiring Methods and Materials
|
335.9
|
Overcurrent protection shall not exceed 5 amperes for 20 AWG and larger conductors, and 3 amperes for 22 AWG conductors. [335.9](https://2023.antflix.net#335.9)
|
https://2023.antflix.net#335.9
|
Chapter 3 Wiring Methods and Materials
|
335.10
|
Bends in Type ITC cables shall be made so as not to damage the cable. [335.10](https://2023.antflix.net#335.10)
|
https://2023.antflix.net#335.10
|
Chapter 3 Wiring Methods and Materials
|
336.1
|
This article covers the use, installation, and construction specifications for power and control tray cable, Type TC. [336.1](https://2023.antflix.net#336.1)
|
https://2023.antflix.net#336.1
|
Chapter 3 Wiring Methods and Materials
|
336.6
|
Type TC cables and associated fittings shall be listed. [336.6](https://2023.antflix.net#336.6)
|
https://2023.antflix.net#336.6
|
Chapter 3 Wiring Methods and Materials
|
336.10
|
Type TC cable shall be permitted to be used as follows: For power, lighting, control, and signal circuits.In cable trays, including those with mechanically discontinuous segments up to 300 mm (1 ft).In raceways.In outdoor locations supported by a messenger wire.For Class 1 circuits as permitted in Parts II and III of Article 725.For non-power-limited fire alarm circuits if conductors comply with the requirements of 760.49.Between a cable tray and the utilization equipment or device(s), provided all of the following apply:The cable is Type TC-ER.The cable is installed in industrial establishments where the conditions of maintenance and supervision ensure that only qualified persons service the installation.The cable is continuously supported and protected against physical damage using mechanical protection such as struts, angles, or channels.The cable complies with the crush and impact requirements of Type MC cable and is identified with the marking "TC-ER."The cable is secured at intervals not exceeding 1.8 m (6 ft).Equipment grounding for the utilization equipment is provided by an equipment grounding conductor within the cable. In cables containing conductors sized 6 AWG or smaller, the equipment grounding conductor shall be provided within the cable or, at the time of installation, one or more insulated conductors shall be permanently identified as an equipment grounding conductor in accordance with 250.119(C).Exception to (7): Where not subject to physical damage, Type TC-ER shall be permitted to transition between cable trays and between cable trays and equipment or devices for a distance not to exceed 1.8 m (6 ft) without continuous support. The cable shall be mechanically supported where exiting the cable tray to ensure that the minimum bending radius is not exceeded.Type TC cable shall be resistant to moisture and corrosive agents where installed in wet locations.For one- and two-family dwelling units, Type TC-ER-JP cable containing conductors for both power and control circuits shall be permitted for branch circuits and feeders. Type TC-ER-JP cable used as interior wiring shall be installed per the requirements of Part II of Article 334 and where installed as exterior wiring shall be installed per the requirements of Part II of Article 340.Exception: Where used to connect a generator and associated equipment having terminals rated 75°C (140°F) or higher, the cable shall not be limited in ampacity by 334.80 or 340.80.Informational Note No. 1: See 725.136 for limitations on Class 2 or 3 circuits contained within the same cable with conductors of electric light, power, or Class 1 circuits.Direct buried, where identified for such use.In hazardous (classified) locations where specifically permitted by other articles in this Code.For service-entrance conductors where identified for such use and marked Type TC-ER.Informational Note No. 2: See 310.14(A)(3) for temperature limitation of conductors. [336.10](https://2023.antflix.net#336.10)
|
https://2023.antflix.net#336.10
|
Chapter 3 Wiring Methods and Materials
|
336.12
|
Type TC tray cable shall not be installed or used as follows: Installed where it will be exposed to physical damageInstalled outside a raceway or cable tray system, except as permitted in 336.10(4), 336.10(7), 336.10(9), and 336.10(10)Used where exposed to direct rays of the sun, unless identified as sunlight resistant [336.12](https://2023.antflix.net#336.12)
|
https://2023.antflix.net#336.12
|
Chapter 3 Wiring Methods and Materials
|
336.24
|
Bends in Type TC cable shall be made so as not to damage the cable. For Type TC cable without metal shielding, the minimum bending radius shall be as follows: Four times the overall diameter for cables 25 mm (1 in.) or less in diameterFive times the overall diameter for cables larger than 25 mm (1 in.) but not more than 50 mm (2 in.) in diameterSix times the overall diameter for cables larger than 50 mm (2 in.) in diameterType TC cables with metallic shielding shall have a minimum bending radius of not less than 12 times the cable overall diameter. [336.24](https://2023.antflix.net#336.24)
|
https://2023.antflix.net#336.24
|
Chapter 3 Wiring Methods and Materials
|
336.80
|
The ampacity of Type TC tray cable shall be determined in accordance with 392.80(A) for 14 AWG and larger conductors, in accordance with 402.5 for 18 AWG through 16 AWG conductors where installed in cable trays, and in accordance with 310.14 where installed outside of cable trays, where permitted. [336.80](https://2023.antflix.net#336.80)
|
https://2023.antflix.net#336.80
|
Chapter 3 Wiring Methods and Materials
|
336.100
|
A metallic sheath or armor as defined in 330.116 shall not be permitted either under or over the nonmetallic jacket. Metallic shield(s) shall be permitted over groups of conductors, under the outer jacket, or both. [336.100](https://2023.antflix.net#336.100)
|
https://2023.antflix.net#336.100
|
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