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Chapter 3 Wiring Methods and Materials
|
354.28
|
For termination, the conduit shall be trimmed away from the conductors or cables using an approved method that will not damage the conductor or cable insulation or jacket. All conduit ends shall be trimmed inside and out to remove rough edges. [354.28](https://2023.antflix.net#354.28)
|
https://2023.antflix.net#354.28
|
Chapter 3 Wiring Methods and Materials
|
354.46
|
Where the NUCC enters a box, fitting, or other enclosure, a bushing or adapter shall be provided to protect the conductor or cable from abrasion unless the design of the box, fitting, or enclosure provides equivalent protection. Informational Note: See 300.4(G) for the protection of conductors size 4 AWG or larger. [354.46](https://2023.antflix.net#354.46)
|
https://2023.antflix.net#354.46
|
Chapter 3 Wiring Methods and Materials
|
354.48
|
All joints between conduit, fittings, and boxes shall be made by an approved method. [354.48](https://2023.antflix.net#354.48)
|
https://2023.antflix.net#354.48
|
Chapter 3 Wiring Methods and Materials
|
354.50
|
All terminations between the conductors or cables and equipment shall be made by an approved method for that type of conductor or cable. [354.50](https://2023.antflix.net#354.50)
|
https://2023.antflix.net#354.50
|
Chapter 3 Wiring Methods and Materials
|
354.56
|
Splices and taps shall be made in junction boxes or other enclosures. [354.56](https://2023.antflix.net#354.56)
|
https://2023.antflix.net#354.56
|
Chapter 3 Wiring Methods and Materials
|
354.60
|
Where equipment grounding is required, an assembly containing a separate grounding conductor shall be used. Exception No. 1: The equipment grounding conductor shall be permitted to be run separately from the conduit 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 to ground equipment as permitted in 250.142. [354.60](https://2023.antflix.net#354.60)
|
https://2023.antflix.net#354.60
|
Chapter 3 Wiring Methods and Materials
|
354.100(A)
|
NUCC is an assembly that is provided in continuous lengths shipped in a coil, reel, or carton. [354.100(A)](https://2023.antflix.net#354.100(A))
|
https://2023.antflix.net#354.100(A)
|
Chapter 3 Wiring Methods and Materials
|
354.100(B)
|
The nonmetallic underground conduit shall be listed and composed of a material that is resistant to moisture and corrosive agents. It shall also be capable of being supplied on reels without damage or distortion and shall be of sufficient strength to withstand abuse, such as impact or crushing, in handling and during installation without damage to conduit or conductors. [354.100(B)](https://2023.antflix.net#354.100(B))
|
https://2023.antflix.net#354.100(B)
|
Chapter 3 Wiring Methods and Materials
|
354.100(C)
|
Conductors and cables used in NUCC shall be listed and shall comply with 310.10(C). Conductors of different systems shall be installed in accordance with 300.3(C). [354.100(C)](https://2023.antflix.net#354.100(C))
|
https://2023.antflix.net#354.100(C)
|
Chapter 3 Wiring Methods and Materials
|
354.100(D)
|
The maximum number of conductors or cables in NUCC shall not exceed that permitted by the percentage fill in Table 1, Chapter 9. [354.100(D)](https://2023.antflix.net#354.100(D))
|
https://2023.antflix.net#354.100(D)
|
Chapter 3 Wiring Methods and Materials
|
354.120
|
NUCC shall be clearly and durably marked at least every 3.05 m (10 ft) as required by 110.21. The type of conduit material shall also be included in the marking. Identification of conductors or cables used in the assembly shall be provided on a tag attached to each end of the assembly or to the side of a reel. Enclosed conductors or cables shall be marked in accordance with 310.8. [354.120](https://2023.antflix.net#354.120)
|
https://2023.antflix.net#354.120
|
Chapter 3 Wiring Methods and Materials
|
355.1
|
This article covers the use, installation, and construction specification for reinforced thermosetting resin conduit (RTRC) and associated fittings. [355.1](https://2023.antflix.net#355.1)
|
https://2023.antflix.net#355.1
|
Chapter 3 Wiring Methods and Materials
|
355.6
|
RTRC, factory elbows, and associated fittings shall be listed. [355.6](https://2023.antflix.net#355.6)
|
https://2023.antflix.net#355.6
|
Chapter 3 Wiring Methods and Materials
|
355.10
|
The use of RTRC shall be permitted in accordance with 355.10(A) through (I). [355.10](https://2023.antflix.net#355.10)
|
https://2023.antflix.net#355.10
|
Chapter 3 Wiring Methods and Materials
|
355.10(A)
|
RTRC shall be permitted in walls, floors, and ceilings. [355.10(A)](https://2023.antflix.net#355.10(A))
|
https://2023.antflix.net#355.10(A)
|
Chapter 3 Wiring Methods and Materials
|
355.10(B)
|
RTRC shall be permitted in locations subject to severe corrosive influences as covered in 300.6 and where subject to chemicals for which the materials are specifically approved. [355.10(B)](https://2023.antflix.net#355.10(B))
|
https://2023.antflix.net#355.10(B)
|
Chapter 3 Wiring Methods and Materials
|
355.10(C)
|
RTRC shall be permitted in cinder fill. [355.10(C)](https://2023.antflix.net#355.10(C))
|
https://2023.antflix.net#355.10(C)
|
Chapter 3 Wiring Methods and Materials
|
355.10(D)
|
RTRC shall be permitted in portions of dairies, laundries, canneries, or other wet locations, and in locations where walls are frequently washed, the entire conduit system, including boxes and fittings used therewith, shall be installed and equipped so as to prevent water from entering the conduit. All supports, bolts, straps, screws, and so forth, shall be of corrosion-resistant materials or be protected against corrosion by approved corrosion-resistant materials. [355.10(D)](https://2023.antflix.net#355.10(D))
|
https://2023.antflix.net#355.10(D)
|
Chapter 3 Wiring Methods and Materials
|
355.10(E)
|
RTRC shall be permitted for use in dry and damp locations not prohibited by 355.12. [355.10(E)](https://2023.antflix.net#355.10(E))
|
https://2023.antflix.net#355.10(E)
|
Chapter 3 Wiring Methods and Materials
|
355.10(F)
|
RTRC shall be permitted for exposed work if identified for such use. Informational Note: RTRC, Type XW, is identified for areas of physical damage. [355.10(F)](https://2023.antflix.net#355.10(F))
|
https://2023.antflix.net#355.10(F)
|
Chapter 3 Wiring Methods and Materials
|
355.10(G)
|
For underground installations, see 300.5 and 305.15. [355.10(G)](https://2023.antflix.net#355.10(G))
|
https://2023.antflix.net#355.10(G)
|
Chapter 3 Wiring Methods and Materials
|
355.10(H)
|
RTRC shall be permitted to support nonmetallic conduit bodies not larger than the largest trade size of an entering raceway. These conduit bodies shall not support luminaires or other equipment and shall not contain devices other than splicing devices as permitted by 110.14(B) and 314.16(C)(2). [355.10(H)](https://2023.antflix.net#355.10(H))
|
https://2023.antflix.net#355.10(H)
|
Chapter 3 Wiring Methods and Materials
|
355.10(I)
|
Conductors or cables rated at a temperature higher than the listed temperature rating of RTRC conduit shall be permitted to be installed in RTRC conduit, if the conductors or cables are not operated at a temperature higher than the listed temperature rating of the RTRC conduit. [355.10(I)](https://2023.antflix.net#355.10(I))
|
https://2023.antflix.net#355.10(I)
|
Chapter 3 Wiring Methods and Materials
|
355.12
|
RTRC shall not be used under the following conditions. [355.12](https://2023.antflix.net#355.12)
|
https://2023.antflix.net#355.12
|
Chapter 3 Wiring Methods and Materials
|
355.12(A)
|
In any hazardous (classified) location, except as permitted by other articles in this CodeIn Class I, Division 2 locations, except as permitted in 501.10(B)(1)(6) [355.12(A)](https://2023.antflix.net#355.12(A))
|
https://2023.antflix.net#355.12(A)
|
Chapter 3 Wiring Methods and Materials
|
355.12(B)
|
For the support of luminaires or other equipment not described in 355.10(H). [355.12(B)](https://2023.antflix.net#355.12(B))
|
https://2023.antflix.net#355.12(B)
|
Chapter 3 Wiring Methods and Materials
|
355.12(C)
|
Where subject to physical damage unless identified for such use. [355.12(C)](https://2023.antflix.net#355.12(C))
|
https://2023.antflix.net#355.12(C)
|
Chapter 3 Wiring Methods and Materials
|
355.12(D)
|
Where subject to ambient temperatures in excess of 50°C (122°F) unless listed otherwise. [355.12(D)](https://2023.antflix.net#355.12(D))
|
https://2023.antflix.net#355.12(D)
|
Chapter 3 Wiring Methods and Materials
|
355.12(E)
|
In theaters and similar locations, except as provided in 518.4 and 520.5. [355.12(E)](https://2023.antflix.net#355.12(E))
|
https://2023.antflix.net#355.12(E)
|
Chapter 3 Wiring Methods and Materials
|
355.20(A)
|
RTRC smaller than metric designator 16 (trade size 1/2) shall not be used. [355.20(A)](https://2023.antflix.net#355.20(A))
|
https://2023.antflix.net#355.20(A)
|
Chapter 3 Wiring Methods and Materials
|
355.20(B)
|
RTRC larger than metric designator 155 (trade size 6) shall not be used. Informational Note: See 300.1(C) for the trade sizes and metric designators that are for identification purposes only and do not relate to actual dimensions. [355.20(B)](https://2023.antflix.net#355.20(B))
|
https://2023.antflix.net#355.20(B)
|
Chapter 3 Wiring Methods and Materials
|
355.22
|
The number of conductors shall not exceed that permitted by the percentage fill specified 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. [355.22](https://2023.antflix.net#355.22)
|
https://2023.antflix.net#355.22
|
Chapter 3 Wiring Methods and Materials
|
355.24(A)
|
Bends shall be so made that the conduit will not be damaged and the internal diameter of the conduit will not be effectively reduced. Field bends shall be made only with identified bending equipment. The radius of the curve to the centerline of such bends shall not be less than shown in Table 2, Chapter 9. [355.24(A)](https://2023.antflix.net#355.24(A))
|
https://2023.antflix.net#355.24(A)
|
Chapter 3 Wiring Methods and Materials
|
355.24(B)
|
The total degrees of bends in a conduit run shall not exceed 360 degrees between pull points. [355.24(B)](https://2023.antflix.net#355.24(B))
|
https://2023.antflix.net#355.24(B)
|
Chapter 3 Wiring Methods and Materials
|
355.28
|
All cut ends shall be trimmed inside and outside to remove rough edges. [355.28](https://2023.antflix.net#355.28)
|
https://2023.antflix.net#355.28
|
Chapter 3 Wiring Methods and Materials
|
355.30
|
RTRC shall be installed as a complete system in accordance with 300.18 and shall be securely fastened in place and supported in accordance with 355.30(A) and (B). [355.30](https://2023.antflix.net#355.30)
|
https://2023.antflix.net#355.30
|
Chapter 3 Wiring Methods and Materials
|
355.30(A)
|
RTRC shall be securely fastened within 900 mm (3 ft) of each outlet box, junction box, device box, conduit body, or other conduit termination. Conduit listed for securing at other than 900 mm (3 ft) shall be permitted to be installed in accordance with the listing. [355.30(A)](https://2023.antflix.net#355.30(A))
|
https://2023.antflix.net#355.30(A)
|
Chapter 3 Wiring Methods and Materials
|
355.30(B)
|
RTRC shall be supported as required in Table 355.30(B). Conduit listed for support at spacing other than as shown in Table 355.30(B) shall be permitted to be installed in accordance with the listing. Horizontal runs of RTRC supported by openings through framing members at intervals not exceeding those in Table 355.30(B) and securely fastened within 900 mm (3 ft) of termination points shall be permitted. Table 355.30(B) Support of Reinforced Thermosetting Resin Conduit (RTRC) Conduit Size Maximum Spacing Between Supports Metric Designator Trade Size mm or m ft 16—27 1/2—1 900 mm 3 35-53 11/4—2 1.5 m 5 63-78 21/2—3 1.8 m 6 91-129 31/2—5 2.1 m 7 155 6 2.5 m 8 [355.30(B)](https://2023.antflix.net#355.30(B))
|
https://2023.antflix.net#355.30(B)
|
Chapter 3 Wiring Methods and Materials
|
355.44
|
Expansion fittings for RTRC shall be provided to compensate for thermal expansion and contraction where the length change, in accordance with Table 355.44, is expected to be 6 mm (1/4 in.) or greater in a straight run between securely mounted items such as boxes, cabinets, elbows, or other conduit terminations. Table 355.44 Expansion Characteristics of Reinforced Thermosetting Resin Conduit (RTRC) Coefficient of Thermal Expansion = 2.7 × 10-5 mm/mm/°C (1.5 × 10-5 in./in./°F) Temperature Change (°C) Length Change of RTRC Conduit (mm/m) Temperature Change (°F) Length Change of RTRC Conduit (in./100 ft) Temperature Change (°F) Length Change of RTRC Conduit (in./100 ft) 5 0.14 5 0.09 105 1.89 10 0.27 10 0.18 110 1.98 15 0.41 15 0.27 115 2.07 20 0.54 20 0.36 120 2.16 25 0.68 25 0.45 125 2.25 30 0.81 30 0.54 130 2.34 35 0.95 35 0.63 135 2.43 40 1.08 40 0.72 140 2.52 45 1.22 45 0.81 145 2.61 50 1.35 50 0.90 150 2.70 55 1.49 55 0.99 155 2.79 60 1.62 60 1.08 160 2.88 65 1.76 65 1.17 165 2.97 70 1.89 70 1.26 170 3.06 75 2.03 75 1.35 175 3.15 80 2.16 80 1.44 180 3.24 85 2.30 85 1.53 185 3.33 90 2.43 90 1.62 190 3.42 95 2.57 95 1.71 195 3.51 100 2.70 100 1.80 200 3.60 [355.44](https://2023.antflix.net#355.44)
|
https://2023.antflix.net#355.44
|
Chapter 3 Wiring Methods and Materials
|
355.46
|
Where a conduit 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 4 AWG and larger at bushings. [355.46](https://2023.antflix.net#355.46)
|
https://2023.antflix.net#355.46
|
Chapter 3 Wiring Methods and Materials
|
355.48
|
All joints between lengths of conduit, and between conduit and couplings, fitting, and boxes, shall be made by an approved method. [355.48](https://2023.antflix.net#355.48)
|
https://2023.antflix.net#355.48
|
Chapter 3 Wiring Methods and Materials
|
355.56
|
Splices and taps shall be made in accordance with 300.15. [355.56](https://2023.antflix.net#355.56)
|
https://2023.antflix.net#355.56
|
Chapter 3 Wiring Methods and Materials
|
355.60
|
Where equipment grounding is required, a separate grounding conductor shall be installed in the conduit. Exception No. 1: The equipment grounding conductor shall be permitted to be run separately from the circuit conductors as permitted in 250.134, Exception No. 2, for dc circuits and 250.134, Exception No. 1, for separately run equipment grounding conductors. Exception No. 2: An equipment grounding conductor shall not be required where the grounded conductor is used to ground equipment as in 250.142(A). [355.60](https://2023.antflix.net#355.60)
|
https://2023.antflix.net#355.60
|
Chapter 3 Wiring Methods and Materials
|
355.100
|
RTRC and fittings shall be composed of suitable nonmetallic material that is resistant to moisture and chemical atmospheres. For use aboveground, it shall also be flame retardant, resistant to impact and crushing, resistant to distortion from heat under conditions likely to be encountered in service, and resistant to low temperature and sunlight effects. For use underground, the material shall be acceptably resistant to moisture and corrosive agents and shall be of sufficient strength to withstand abuse, such as by impact and crushing, in handling and during installation. Where intended for direct burial, without encasement in concrete, the material shall also be capable of withstanding continued loading that is likely to be encountered after installation. [355.100](https://2023.antflix.net#355.100)
|
https://2023.antflix.net#355.100
|
Chapter 3 Wiring Methods and Materials
|
355.120
|
Each length of RTRC 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 unless it is visually identifiable. For conduit recognized for use aboveground, these markings shall be permanent. For conduit limited to underground use only, these markings shall be sufficiently durable to remain legible until the material is installed. Conduit shall be permitted to be surface marked to indicate special characteristics of the material. Informational Note: Examples of these markings include but are not limited to "limited smoke" and "sunlight resistant." [355.120](https://2023.antflix.net#355.120)
|
https://2023.antflix.net#355.120
|
Chapter 3 Wiring Methods and Materials
|
356.1
|
This article covers the use, installation, and construction specifications for liquidtight flexible nonmetallic conduit (LFNC) and associated fittings. [356.1](https://2023.antflix.net#356.1)
|
https://2023.antflix.net#356.1
|
Chapter 3 Wiring Methods and Materials
|
356.6
|
LFNC and associated fittings shall be listed. [356.6](https://2023.antflix.net#356.6)
|
https://2023.antflix.net#356.6
|
Chapter 3 Wiring Methods and Materials
|
356.10
|
LFNC shall be permitted to be used in exposed or concealed locations for the following purposes: Where flexibility is required for installation, operation, or maintenance.Where protection of the contained conductors is required from vapors, machine oils, liquids, or solids.For outdoor locations where listed and marked as suitable for the purpose.For direct burial where listed and marked for the purpose.Installed in lengths longer than 1.8 m (6 ft) where secured in accordance with 356.30.LFNC-B as a listed manufactured prewired assembly, metric designator 16 through 27 (trade size 1/2 through 1) conduit.For encasement in concrete where listed for direct burial and installed in compliance with 356.42.In locations subject to severe corrosive influences as covered in 300.6 and where subject to chemicals for which the materials are specifically approved.Conductors or cables rated at a temperature higher than the listed temperature rating of LFNC shall be permitted to be installed in LFNC, provided the conductors or cables are not operated at a temperature higher than the listed temperature rating of the LFNC.Informational Note: Extreme cold can cause some types of nonmetallic conduits to become brittle and therefore more susceptible to damage from physical contact. [356.10](https://2023.antflix.net#356.10)
|
https://2023.antflix.net#356.10
|
Chapter 3 Wiring Methods and Materials
|
356.12
|
LFNC shall not be used as follows: Where subject to physical damageWhere any combination of ambient and conductor temperatures is in excess of that for which it is listedIn lengths longer than 1.8 m (6 ft), except as permitted by 356.10(5) or where a longer length is approved as essential for a required degree of flexibilityIn any hazardous (classified) location, except as permitted by other articles in this Code [356.12](https://2023.antflix.net#356.12)
|
https://2023.antflix.net#356.12
|
Chapter 3 Wiring Methods and Materials
|
356.20(A)
|
LFNC smaller than metric designator 16 (trade size 1/2) shall not be used unless permitted for metric designator 12 (trade size 3/8) as follows: For enclosing the leads of motors as permitted in 430.245(B)In lengths not exceeding 1.8 m (6 ft) as part of a listed assembly for tap connections to luminaires as required in 410.117(C), or for utilization equipment [356.20(A)](https://2023.antflix.net#356.20(A))
|
https://2023.antflix.net#356.20(A)
|
Chapter 3 Wiring Methods and Materials
|
356.20(B)
|
LFNC larger than metric designator 103 (trade size 4) 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. [356.20(B)](https://2023.antflix.net#356.20(B))
|
https://2023.antflix.net#356.20(B)
|
Chapter 3 Wiring Methods and Materials
|
356.22
|
The number of conductors shall not exceed that permitted by the percentage fill specified 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. [356.22](https://2023.antflix.net#356.22)
|
https://2023.antflix.net#356.22
|
Chapter 3 Wiring Methods and Materials
|
356.24(A)
|
Bends in conduit shall be so made that the conduit is not damaged and the internal diameter of the conduit is not effectively reduced. Bends shall be permitted to be made manually without auxiliary equipment. The radius of the curve to the centerline of any bend shall not be less than shown in Table 2, Chapter 9 using the column "Other Bends." [356.24(A)](https://2023.antflix.net#356.24(A))
|
https://2023.antflix.net#356.24(A)
|
Chapter 3 Wiring Methods and Materials
|
356.24(B)
|
The total degrees of bends in a conduit run shall not exceed 360 degrees between pull points. [356.24(B)](https://2023.antflix.net#356.24(B))
|
https://2023.antflix.net#356.24(B)
|
Chapter 3 Wiring Methods and Materials
|
356.28
|
All cut ends of conduit shall be trimmed inside and outside to remove rough edges. [356.28](https://2023.antflix.net#356.28)
|
https://2023.antflix.net#356.28
|
Chapter 3 Wiring Methods and Materials
|
356.30
|
LFNC shall be securely fastened and supported in accordance with one of the following: Where installed in lengths exceeding 1.8 m (6 ft), the conduit shall be securely fastened at intervals not exceeding 900 mm (3 ft) and within 300 mm (12 in.) on each side of every outlet box, junction box, cabinet, or fitting. Where used, cable ties shall be listed for the application and for securing and supporting.Securing or supporting of the conduit shall not be required where it is fished, installed in lengths not exceeding 900 mm (3 ft) at terminals where flexibility is required, or installed in lengths not exceeding 1.8 m (6 ft) from a luminaire terminal connection for tap conductors to luminaires permitted in 410.117(C).Horizontal runs of LFNC supported by openings through framing members at intervals not exceeding 900 mm (3 ft) and securely fastened within 300 mm (12 in.) of termination points shall be permitted.Securing or supporting of LFNC shall not be required where installed in 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 a luminaire(s) or other equipment. For the purpose of 356.30, listed liquidtight flexible nonmetallic conduit fittings shall be permitted as a means of support. [356.30](https://2023.antflix.net#356.30)
|
https://2023.antflix.net#356.30
|
Chapter 3 Wiring Methods and Materials
|
356.42
|
Only fittings listed for use with LFNC shall be used. Angle connectors shall not be used for concealed raceway installations. Straight LFNC fittings are permitted for direct burial or encasement in concrete. [356.42](https://2023.antflix.net#356.42)
|
https://2023.antflix.net#356.42
|
Chapter 3 Wiring Methods and Materials
|
356.56
|
Splices and taps shall be made in accordance with 300.15. [356.56](https://2023.antflix.net#356.56)
|
https://2023.antflix.net#356.56
|
Chapter 3 Wiring Methods and Materials
|
356.60
|
Where equipment grounding is required, a separate grounding conductor shall be installed in the conduit. Exception No. 1: The equipment grounding conductor shall be permitted to be run separately from the circuit conductors as permitted in 250.134, Exception No. 2, for dc circuits and 250.134, Exception No. 1, for separately run equipment grounding conductors. Exception No. 2: The equipment grounding conductor shall not be required where the grounded conductor is used to ground equipment as permitted in 250.142. [356.60](https://2023.antflix.net#356.60)
|
https://2023.antflix.net#356.60
|
Chapter 3 Wiring Methods and Materials
|
356.100
|
LFNC-B as a prewired manufactured assembly shall be provided in continuous lengths capable of being shipped in a coil, reel, or carton without damage. [356.100](https://2023.antflix.net#356.100)
|
https://2023.antflix.net#356.100
|
Chapter 3 Wiring Methods and Materials
|
356.120
|
LFNC shall be marked at least every 600 mm (2 ft) in accordance with 110.21. The marking shall include a type designation in accordance with the definition of Conduit, Liquidtight Flexible Nonmetallic (LFNC) in Article 100 and the trade size. Conduit that is intended for outdoor use or direct burial shall be marked. 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. [356.120](https://2023.antflix.net#356.120)
|
https://2023.antflix.net#356.120
|
Chapter 3 Wiring Methods and Materials
|
358.1
|
This article covers the use, installation, and construction specifications for electrical metallic tubing (EMT) and associated fittings. [358.1](https://2023.antflix.net#358.1)
|
https://2023.antflix.net#358.1
|
Chapter 3 Wiring Methods and Materials
|
358.6
|
EMT, factory elbows, and associated fittings shall be listed. [358.6](https://2023.antflix.net#358.6)
|
https://2023.antflix.net#358.6
|
Chapter 3 Wiring Methods and Materials
|
358.10(A)
|
The use of EMT shall be permitted for both exposed and concealed work for the following: In concrete, in direct contact with the earth, in direct burial applications with fittings identified for direct burial, or in areas subject to severe corrosive influences where installed in accordance with 358.10(B)In dry, damp, and wet locationsIn any hazardous (classified) location as permitted by other articles in this CodeFor manufactured wiring systems as permitted in 604.100(A)(2) [358.10(A)](https://2023.antflix.net#358.10(A))
|
https://2023.antflix.net#358.10(A)
|
Chapter 3 Wiring Methods and Materials
|
358.10(B)(1)
|
Galvanized steel and stainless steel EMT, elbows, and fittings shall be permitted to be installed in concrete, in direct contact with the earth, or in areas subject to severe corrosive influences where protected by corrosion protection and approved as suitable for the condition. [358.10(B)(1)](https://2023.antflix.net#358.10(B)(1))
|
https://2023.antflix.net#358.10(B)(1)
|
Chapter 3 Wiring Methods and Materials
|
358.10(B)(2)
|
Aluminum EMT shall be provided with approved supplementary corrosion protection where encased in concrete or in direct contact with the earth. [358.10(B)(2)](https://2023.antflix.net#358.10(B)(2))
|
https://2023.antflix.net#358.10(B)(2)
|
Chapter 3 Wiring Methods and Materials
|
358.10(C)
|
Galvanized steel and stainless steel EMT shall be permitted to be installed in cinder concrete or cinder fill where subject to permanent moisture when protected on all sides by a layer of noncinder concrete at least 50 mm (2 in.) thick or when the tubing is installed at least 450 mm (18 in.) under the fill. [358.10(C)](https://2023.antflix.net#358.10(C))
|
https://2023.antflix.net#358.10(C)
|
Chapter 3 Wiring Methods and Materials
|
358.10(D)
|
All supports, bolts, straps, screws, and so forth shall be of corrosion-resistant materials or protected against corrosion by corrosion-resistant materials. Informational Note: See 300.6 for protection against corrosion. [358.10(D)](https://2023.antflix.net#358.10(D))
|
https://2023.antflix.net#358.10(D)
|
Chapter 3 Wiring Methods and Materials
|
358.10(E)
|
Steel and stainless steel EMT shall be permitted to be installed where subject to physical damage. [358.10(E)](https://2023.antflix.net#358.10(E))
|
https://2023.antflix.net#358.10(E)
|
Chapter 3 Wiring Methods and Materials
|
358.12
|
EMT shall not be used under the following conditions: Where subject to severe physical damageFor the support of luminaires or other equipment except conduit bodies no larger than the largest trade size of the tubing [358.12](https://2023.antflix.net#358.12)
|
https://2023.antflix.net#358.12
|
Chapter 3 Wiring Methods and Materials
|
358.14
|
Where practicable, dissimilar metals in contact anywhere in the system shall be avoided to eliminate the possibility of galvanic action. Stainless steel and aluminum fittings and enclosures shall be permitted to be used with galvanized steel EMT, and galvanized steel fittings and enclosures shall be permitted to be used with aluminum EMT where not subject to severe corrosive influences. Stainless steel EMT shall only be used with the following:Stainless steel fittingsStainless steel boxes and enclosuresSteel (galvanized, painted, powder or PVC coated, and so forth) boxes and enclosures when not subject to severe corrosive influencesStainless steel, nonmetallic, or approved accessories [358.14](https://2023.antflix.net#358.14)
|
https://2023.antflix.net#358.14
|
Chapter 3 Wiring Methods and Materials
|
358.20(A)
|
EMT smaller than metric designator 16 (trade size 1/2) shall not be used. Exception: Metric designator 12 (trade size 3/8) shall be permitted for enclosing the leads of motors as permitted in 430.245(B). [358.20(A)](https://2023.antflix.net#358.20(A))
|
https://2023.antflix.net#358.20(A)
|
Chapter 3 Wiring Methods and Materials
|
358.20(B)
|
The maximum size of EMT shall be metric designator 155 (trade size 6). 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. [358.20(B)](https://2023.antflix.net#358.20(B))
|
https://2023.antflix.net#358.20(B)
|
Chapter 3 Wiring Methods and Materials
|
358.22
|
The number of conductors shall not exceed that permitted by the percentage fill specified 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. [358.22](https://2023.antflix.net#358.22)
|
https://2023.antflix.net#358.22
|
Chapter 3 Wiring Methods and Materials
|
358.24(A)
|
Bends shall be made so that the tubing is not damaged and the internal diameter of the tubing is not effectively reduced. The radius of the curve of any field bend to the centerline of the tubing shall not be less than shown in Table 2, Chapter 9 for one-shot and full shoe benders. [358.24(A)](https://2023.antflix.net#358.24(A))
|
https://2023.antflix.net#358.24(A)
|
Chapter 3 Wiring Methods and Materials
|
358.24(B)
|
The total degrees of bends in a tubing run shall not exceed 360 degrees between pull points. [358.24(B)](https://2023.antflix.net#358.24(B))
|
https://2023.antflix.net#358.24(B)
|
Chapter 3 Wiring Methods and Materials
|
358.28(A)
|
All cut ends of EMT shall be reamed or otherwise finished to remove rough edges. [358.28(A)](https://2023.antflix.net#358.28(A))
|
https://2023.antflix.net#358.28(A)
|
Chapter 3 Wiring Methods and Materials
|
358.28(B)
|
EMT shall not be threaded. Exception: EMT with factory threaded integral couplings complying with 358.100 shall be permitted. [358.28(B)](https://2023.antflix.net#358.28(B))
|
https://2023.antflix.net#358.28(B)
|
Chapter 3 Wiring Methods and Materials
|
358.30
|
EMT shall be installed as a complete system in accordance with 300.18 and shall be securely fastened in place and supported in accordance with 358.30(A) and (B). [358.30](https://2023.antflix.net#358.30)
|
https://2023.antflix.net#358.30
|
Chapter 3 Wiring Methods and Materials
|
358.30(A)
|
EMT shall be securely fastened in place in accordance with the following: At intervals not to exceed 3 m (10 ft)Within 900 mm (3 ft) of each outlet box, junction box, device box, cabinet, conduit body, or other tubing terminationException No. 1: Fastening of unbroken lengths shall be permitted to be increased to a distance of 1.5 m (5 ft) where structural members do not readily permit fastening within 900 mm (3 ft).Exception No. 2: For concealed work in finished buildings or prefinished wall panels where such securing is impracticable, unbroken lengths (without coupling) of EMT shall be permitted to be fished. [358.30(A)](https://2023.antflix.net#358.30(A))
|
https://2023.antflix.net#358.30(A)
|
Chapter 3 Wiring Methods and Materials
|
358.30(B)
|
Horizontal runs of EMT supported by openings through framing members at intervals not greater than 3 m (10 ft) and securely fastened within 900 mm (3 ft) of termination points shall be permitted. [358.30(B)](https://2023.antflix.net#358.30(B))
|
https://2023.antflix.net#358.30(B)
|
Chapter 3 Wiring Methods and Materials
|
358.42
|
Couplings and connectors used with EMT shall be made up tight. Where buried in masonry or concrete, they shall be concretetight type. Where installed in wet locations, they shall comply with 314.15. [358.42](https://2023.antflix.net#358.42)
|
https://2023.antflix.net#358.42
|
Chapter 3 Wiring Methods and Materials
|
358.56
|
Splices and taps shall be made in accordance with 300.15. [358.56](https://2023.antflix.net#358.56)
|
https://2023.antflix.net#358.56
|
Chapter 3 Wiring Methods and Materials
|
358.60
|
EMT shall be permitted as an equipment grounding conductor. [358.60](https://2023.antflix.net#358.60)
|
https://2023.antflix.net#358.60
|
Chapter 3 Wiring Methods and Materials
|
358.100
|
EMT shall be made of one of the following: Steel with protective coatingsAluminumStainless steel [358.100](https://2023.antflix.net#358.100)
|
https://2023.antflix.net#358.100
|
Chapter 3 Wiring Methods and Materials
|
358.120
|
EMT shall be clearly and durably marked at least every 3 m (10 ft) as required in the first sentence of 110.21 (A). [358.120](https://2023.antflix.net#358.120)
|
https://2023.antflix.net#358.120
|
Chapter 3 Wiring Methods and Materials
|
360.1
|
This article covers the use, installation, and construction specifications for flexible metallic tubing (FMT) and associated fittings. [360.1](https://2023.antflix.net#360.1)
|
https://2023.antflix.net#360.1
|
Chapter 3 Wiring Methods and Materials
|
360.6
|
FMT and associated fittings shall be listed. [360.6](https://2023.antflix.net#360.6)
|
https://2023.antflix.net#360.6
|
Chapter 3 Wiring Methods and Materials
|
360.10
|
FMT shall be permitted to be used for branch circuits as follows: In dry locationsWhere concealedIn accessible locationsFor system voltages of 1000 volts maximum [360.10](https://2023.antflix.net#360.10)
|
https://2023.antflix.net#360.10
|
Chapter 3 Wiring Methods and Materials
|
360.12
|
FMT shall not be used as follows: In hoistwaysIn storage battery roomsIn hazardous (classified) locations unless otherwise permitted under other articles in this CodeUnderground for direct earth burial, or embedded in poured concrete or aggregateWhere subject to physical damageIn lengths over 1.8 m (6 ft) [360.12](https://2023.antflix.net#360.12)
|
https://2023.antflix.net#360.12
|
Chapter 3 Wiring Methods and Materials
|
360.20(A)
|
FMT smaller than metric designator 16 (trade size 1/2) shall not be used. Exception No. 1: FMT of metric designator 12 (trade size 3/8) shall be permitted to be installed in accordance with 300.22(B) and (C). Exception No. 2: FMT of metric designator 12 (trade size 3/8) shall be permitted in lengths not in excess of 1.8 m (6 ft) as part of a listed assembly or for luminaires. See 410.117(C). [360.20(A)](https://2023.antflix.net#360.20(A))
|
https://2023.antflix.net#360.20(A)
|
Chapter 3 Wiring Methods and Materials
|
360.20(B)
|
The maximum size of FMT shall be metric designator 21 (trade size 3/4). 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. [360.20(B)](https://2023.antflix.net#360.20(B))
|
https://2023.antflix.net#360.20(B)
|
Chapter 3 Wiring Methods and Materials
|
360.22(A)
|
The number of conductors in metric designators 16 (trade size 1/2) and 21 (trade size 3/4) shall not exceed that permitted by the percentage fill specified 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. [360.22(A)](https://2023.antflix.net#360.22(A))
|
https://2023.antflix.net#360.22(A)
|
Chapter 3 Wiring Methods and Materials
|
360.22(B)
|
The number of conductors in metric designator 12 (trade size 3/8) shall not exceed that permitted in Table 348.22. [360.22(B)](https://2023.antflix.net#360.22(B))
|
https://2023.antflix.net#360.22(B)
|
Chapter 3 Wiring Methods and Materials
|
360.24(A)
|
When FMT is infrequently flexed in service after installation, the radii of bends measured to the inside of the bend shall not be less than specified in Table 360.24(A).Table 360.24(A) Minimum Radii for Flexing Use
Metric Designator
Trade Size
Minimum Radii for Flexing Use
mm
in.
12
3/8
254.0
10
16
1/2
317.5
121/2
21
3/4
444.5
171/2
[360.24(A)](https://2023.antflix.net#360.24(A))
|
https://2023.antflix.net#360.24(A)
|
Chapter 3 Wiring Methods and Materials
|
360.24(B)
|
Where FMT is bent for installation purposes and is not flexed or bent as required by use after installation, the radii of bends measured to the inside of the bend shall not be less than specified in Table 360.24(B).
Table 360.24(B) Minimum Radii for Fixed Bends
Metric Designator
Trade Size
Minimum Radii for Flexing Use
mm
in.
12
3/8
88.9
31/2
16
1/2
101.6
4
21
3/4
127.0
5
[360.24(B)](https://2023.antflix.net#360.24(B))
|
https://2023.antflix.net#360.24(B)
|
Chapter 3 Wiring Methods and Materials
|
360.56
|
Splices and taps shall be made in accordance with 300.15. [360.56](https://2023.antflix.net#360.56)
|
https://2023.antflix.net#360.56
|
Chapter 3 Wiring Methods and Materials
|
360.60
|
FMT shall be permitted as an equipment grounding conductor where installed in accordance with 250.118(A)(7). [360.60](https://2023.antflix.net#360.60)
|
https://2023.antflix.net#360.60
|
Chapter 3 Wiring Methods and Materials
|
360.120
|
FMT shall be marked according to 110.21. [360.120](https://2023.antflix.net#360.120)
|
https://2023.antflix.net#360.120
|
Chapter 3 Wiring Methods and Materials
|
362.1
|
This article covers the use, installation, and construction specifications for electrical nonmetallic tubing (ENT) and associated fittings. [362.1](https://2023.antflix.net#362.1)
|
https://2023.antflix.net#362.1
|
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