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Chapter 3 Wiring Methods and Materials
|
336.104
|
For ungrounded, grounded, and equipment grounding conductors, the conductor sizes shall be 14 AWG through 1000 kcmil copper, nickel, or nickel-coated copper and 12 AWG through 1000 kcmil aluminum or copper-clad aluminum. Insulation types shall be one of the types listed in Table 310.4(1) or Table 310.4(2) that is suitable for branch circuit and feeder circuits or one that is identified for such use. For control and signal conductors, the minimum conductor sizes shall be 18 AWG copper, nickel, or nickel-coated copper, 14 AWG copper-clad aluminum, and 12 AWG aluminum. [336.104](https://2023.antflix.net#336.104)
|
https://2023.antflix.net#336.104
|
Chapter 3 Wiring Methods and Materials
|
336.104(A)
|
Where used for fire alarm systems, conductors shall also be in accordance with 760.49. [336.104(A)](https://2023.antflix.net#336.104(A))
|
https://2023.antflix.net#336.104(A)
|
Chapter 3 Wiring Methods and Materials
|
336.104(B)
|
Conductors in Type TC cable used for thermocouple circuits in accordance with Part III of Article 724 shall also be permitted to be any of the materials used for thermocouple extension wire. [336.104(B)](https://2023.antflix.net#336.104(B))
|
https://2023.antflix.net#336.104(B)
|
Chapter 3 Wiring Methods and Materials
|
336.104(C)
|
Insulated conductors of 18 AWG and 16 AWG copper shall also be in accordance with 724.49. [336.104(C)](https://2023.antflix.net#336.104(C))
|
https://2023.antflix.net#336.104(C)
|
Chapter 3 Wiring Methods and Materials
|
336.116
|
The outer jacket shall be a flame-retardant, nonmetallic material. [336.116](https://2023.antflix.net#336.116)
|
https://2023.antflix.net#336.116
|
Chapter 3 Wiring Methods and Materials
|
336.120
|
There shall be no voltage marking on a Type TC cable employing thermocouple extension wire. [336.120](https://2023.antflix.net#336.120)
|
https://2023.antflix.net#336.120
|
Chapter 3 Wiring Methods and Materials
|
336.130
|
Cable listed and marked Type TC-ER-HL shall comply with the following: The overall nonmetallic jacket shall be suitable for the environment.The overall cable construction shall be essentially circular in cross-section.The overall nonmetallic jacket shall be continuous and gas/vapor tight.For construction greater than 25.4 mm (1 in.) in diameter, the following shall apply:The equipment grounding conductor shall be bare.A metallic shield shall be included over all conductors under the outer jacket. [336.130](https://2023.antflix.net#336.130)
|
https://2023.antflix.net#336.130
|
Chapter 3 Wiring Methods and Materials
|
337.1
|
This article covers the use, installation, and construction specifications for up through 2000 volt Type P cable (armored and unarmored). [337.1](https://2023.antflix.net#337.1)
|
https://2023.antflix.net#337.1
|
Chapter 3 Wiring Methods and Materials
|
337.6
|
Type P cables and associated fittings shall be listed. [337.6](https://2023.antflix.net#337.6)
|
https://2023.antflix.net#337.6
|
Chapter 3 Wiring Methods and Materials
|
337.10
|
Type P cable shall be permitted to be used: Under engineering supervision in industrial installations where conditions of maintenance and supervision ensure that only qualified persons monitor and service the system.In hazardous (classified) locations where specifically permitted by other articles in this Code. [337.10](https://2023.antflix.net#337.10)
|
https://2023.antflix.net#337.10
|
Chapter 3 Wiring Methods and Materials
|
337.12
|
Type P cable shall not be installed or used: Where it will be exposed to physical damageWhere not specifically permitted by other articles in the Code [337.12](https://2023.antflix.net#337.12)
|
https://2023.antflix.net#337.12
|
Chapter 3 Wiring Methods and Materials
|
337.24
|
The minimum bending radii during installations and handling in service shall be adequate to prevent damage to the cable. [337.24](https://2023.antflix.net#337.24)
|
https://2023.antflix.net#337.24
|
Chapter 3 Wiring Methods and Materials
|
337.30
|
Type P cable shall be supported and secured by 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. [337.30](https://2023.antflix.net#337.30)
|
https://2023.antflix.net#337.30
|
Chapter 3 Wiring Methods and Materials
|
337.31
|
Where single-conductor cables are used, the installation shall comply with 300.20. [337.31](https://2023.antflix.net#337.31)
|
https://2023.antflix.net#337.31
|
Chapter 3 Wiring Methods and Materials
|
337.80
|
The ampacity of Type P cable shall be determined in accordance with 310.14(A) or (B) for 14 AWG and larger conductors. For 18 AWG and 16 AWG conductors, the ampacities shall be determined in accordance with Table 402.5 or 310.14(B). When installed in cable tray, the ampacities shall be permitted to be determined in accordance with 392.80. The installation shall not exceed the temperature ratings of terminations and equipment. [337.80](https://2023.antflix.net#337.80)
|
https://2023.antflix.net#337.80
|
Chapter 3 Wiring Methods and Materials
|
337.104
|
Conductors shall be of tinned copper. Conductors shall employ flexible stranding. The minimum conductor size shall be 18 AWG. [337.104](https://2023.antflix.net#337.104)
|
https://2023.antflix.net#337.104
|
Chapter 3 Wiring Methods and Materials
|
337.108
|
An equipment grounding conductor complying with 250.122 shall be provided within multiconductor Type P cable. [337.108](https://2023.antflix.net#337.108)
|
https://2023.antflix.net#337.108
|
Chapter 3 Wiring Methods and Materials
|
337.112
|
Insulated conductors shall be a thermoset type identified for use in Type P cable. All conductors shall be suitable for wet locations. The minimum wall thickness shall be 0.76 mm (30 mils). [337.112](https://2023.antflix.net#337.112)
|
https://2023.antflix.net#337.112
|
Chapter 3 Wiring Methods and Materials
|
337.114
|
Metallic shield(s) shall be permitted over a single conductor or groups of conductors. [337.114](https://2023.antflix.net#337.114)
|
https://2023.antflix.net#337.114
|
Chapter 3 Wiring Methods and Materials
|
337.115
|
Multiconductor cables shall have an overall nonmetallic jacket that is impervious to moisture, corrosion resistant, and sunlight resistant. When installed external to an enclosure or industrial machinery, single conductor cables shall have an overall nonmetallic jacket that is impervious to moisture, corrosion resistant, and sunlight resistant. Single conductor cables rated 2000 volts with conductor sizes equal to or larger than 4/0 AWG shall be permitted to use an increased insulation thickness in lieu of using a separate cable jacket. When the increased insulation thickness is used, the insulation material shall be sunlight resistant. [337.115](https://2023.antflix.net#337.115)
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https://2023.antflix.net#337.115
|
Chapter 3 Wiring Methods and Materials
|
337.116
|
Armor shall be permitted over the jacket. If provided, the armor or metallic covering shall be a braided basket weave type consisting of wire laid closely together, flat and parallel, and forming a basket weave that shall firmly grip the cable. The wire shall be commercial bronze, tinned copper, stainless steel, or aluminum. The armor shall not be used as a current-carrying conductor or as an equipment grounding conductor. A nonmetallic jacket that conforms to 337.115 shall be provided over the armor. [337.116](https://2023.antflix.net#337.116)
|
https://2023.antflix.net#337.116
|
Chapter 3 Wiring Methods and Materials
|
337.120
|
Type P cable shall be marked in accordance with 310.8. When an armor is provided, the cable shall be marked accordingly. [337.120](https://2023.antflix.net#337.120)
|
https://2023.antflix.net#337.120
|
Chapter 3 Wiring Methods and Materials
|
338.1
|
This article covers the use, installation, and construction specifications of service-entrance cable. [338.1](https://2023.antflix.net#338.1)
|
https://2023.antflix.net#338.1
|
Chapter 3 Wiring Methods and Materials
|
338.6
|
Type SE and USE cables and associated fittings shall be listed. [338.6](https://2023.antflix.net#338.6)
|
https://2023.antflix.net#338.6
|
Chapter 3 Wiring Methods and Materials
|
338.10(A)
|
Service-entrance cable shall be permitted to be used as service-entrance conductors and shall be installed in accordance with 230.6, 230.7, and Parts II, III, and IV of Article 230. [338.10(A)](https://2023.antflix.net#338.10(A))
|
https://2023.antflix.net#338.10(A)
|
Chapter 3 Wiring Methods and Materials
|
338.10(B)(1)
|
Type SE service-entrance cables shall be permitted in wiring systems where all of the circuit conductors of the cable are of the thermoset or thermoplastic type. [338.10(B)(1)](https://2023.antflix.net#338.10(B)(1))
|
https://2023.antflix.net#338.10(B)(1)
|
Chapter 3 Wiring Methods and Materials
|
338.10(B)(2)
|
Type SE service-entrance cable shall be permitted for use where the insulated conductors are used for circuit wiring and the uninsulated conductor is used only for equipment grounding purposes. Exception: In existing installations, uninsulated conductors shall be permitted as a grounded conductor in accordance with 250.32 and 250.140, where the uninsulated grounded conductor of the cable originates in service equipment, and with 225.30 through 225.40. [338.10(B)(2)](https://2023.antflix.net#338.10(B)(2))
|
https://2023.antflix.net#338.10(B)(2)
|
Chapter 3 Wiring Methods and Materials
|
338.10(B)(3)
|
Type SE service-entrance cable used to supply appliances shall not be subject to conductor temperatures in excess of the temperature specified for the type of insulation involved. [338.10(B)(3)](https://2023.antflix.net#338.10(B)(3))
|
https://2023.antflix.net#338.10(B)(3)
|
Chapter 3 Wiring Methods and Materials
|
338.10(B)(4)
|
Interior Installations. Interior installations shall comply with the following:In addition to the provisions of this article, Type SE service-entrance cable used for interior wiring shall comply with the installation requirements of Part II of Article 334, excluding 334.80.Where more than two Type SE 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).For Type SE cable with ungrounded conductor sizes 10 AWG and smaller, where installed in contact with thermal insulation, the ampacity shall be in accordance with 60°C (140°F) conductor temperature rating. The maximum conductor temperature rating shall be permitted to be used for ampacity adjustment and correction purposes, if the final ampacity does not exceed that for a 60°C (140°F) rated conductor.Exterior Installations. Exterior installations shall comply with the following:In addition to the provisions of this article, service-entrance cable used for feeders or branch circuits, where installed as exterior wiring, shall be installed in accordance with Part I of Article 225. The cable shall be supported in accordance with 334.30.Type USE cable installed as underground feeder and branch circuit cable shall comply with Part II of Article 340.Exception: Single-conductor Type USE and multi-rated USE conductors shall not be subject to the ampacity limitations of Part II of Article 340. [338.10(B)(4)](https://2023.antflix.net#338.10(B)(4))
|
https://2023.antflix.net#338.10(B)(4)
|
Chapter 3 Wiring Methods and Materials
|
338.12(A)
|
Type SE cable shall not be used under the following conditions or in the following locations: Where subject to physical damage unless protected in accordance with 230.50(B)Underground with or without a racewayFor exterior branch circuits and feeder wiring unless the installation complies with Part I of Article 225 and is supported in accordance with 334.30 or is used as messenger-supported wiring as permitted in Part II of Article 396 [338.12(A)](https://2023.antflix.net#338.12(A))
|
https://2023.antflix.net#338.12(A)
|
Chapter 3 Wiring Methods and Materials
|
338.12(B)
|
Type USE cable shall not be used under the following conditions or in the following locations: For interior wiringFor aboveground installations except where USE cable emerges from the ground and is terminated in an enclosure at an outdoor location and the cable is protected in accordance with 300.5(D)As aerial cable unless it is a multiconductor cable identified for use aboveground and installed as messenger-supported wiring in accordance with 225.10 and Part II of Article 396 [338.12(B)](https://2023.antflix.net#338.12(B))
|
https://2023.antflix.net#338.12(B)
|
Chapter 3 Wiring Methods and Materials
|
338.24
|
Bends in Types USE and SE 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. [338.24](https://2023.antflix.net#338.24)
|
https://2023.antflix.net#338.24
|
Chapter 3 Wiring Methods and Materials
|
338.100(A)
|
Cabled assemblies of multiple single-conductor Type USE conductors shall be permitted for direct burial. All conductors shall be insulated. Informational Note: The term "cabled" refers to a manufacturing process of twisting single conductors together and may also be referred to as "plexed." [338.100(A)](https://2023.antflix.net#338.100(A))
|
https://2023.antflix.net#338.100(A)
|
Chapter 3 Wiring Methods and Materials
|
338.100(B)
|
Type SE or USE cable with an overall covering containing two or more conductors shall be permitted to have one conductor uninsulated. [338.100(B)](https://2023.antflix.net#338.100(B))
|
https://2023.antflix.net#338.100(B)
|
Chapter 3 Wiring Methods and Materials
|
338.120
|
Service-entrance cable shall be marked as required in 310.8. Cable with the neutral conductor smaller than the ungrounded conductors shall be so marked. [338.120](https://2023.antflix.net#338.120)
|
https://2023.antflix.net#338.120
|
Chapter 3 Wiring Methods and Materials
|
340.1
|
This article covers the use, installation, and construction specifications for underground feeder and branch-circuit cable. Type UF. [340.1](https://2023.antflix.net#340.1)
|
https://2023.antflix.net#340.1
|
Chapter 3 Wiring Methods and Materials
|
340.6
|
Type UF cable and associated fittings shall be listed. [340.6](https://2023.antflix.net#340.6)
|
https://2023.antflix.net#340.6
|
Chapter 3 Wiring Methods and Materials
|
340.10
|
Type UF cable shall be permitted as follows: For use underground, including direct burial in the earth.As single-conductor cables. Where installed as single-conductor cables, all conductors of the feeder or branch circuit, including the grounded conductor and equipment grounding conductor, if any, shall be installed in accordance with 300.3.For wiring in wet, dry, or corrosive locations.Installed as nonmetallic-sheathed cable. Where so installed, the installation and conductor requirements shall comply with Parts II and III of Article 334, except for 334.12(B), and shall be of the multiconductor type.As single-conductor cables as the nonheating leads for heating cables as provided in 424.43.Supported by cable trays. Type UF cable supported by cable trays shall be of the multiconductor type.Informational Note: See 310.14(A)(3) for temperature limitation of conductors. [340.10](https://2023.antflix.net#340.10)
|
https://2023.antflix.net#340.10
|
Chapter 3 Wiring Methods and Materials
|
340.12
|
Type UF cable shall not be used as follows: As service-entrance cableIn commercial garagesIn theaters and similar locationsIn motion picture studiosIn storage battery roomsIn hoistways or on elevators or escalatorsIn hazardous (classified) locations, except as specifically permitted by other articles in this CodeEmbedded in poured cement, concrete, or aggregate, except where embedded in plaster as nonheating leads where permitted in 424.43Where exposed to direct rays of the sun, unless identified as sunlight resistantInformational Note: The sunlight-resistant marking on the jacket does not apply to the individual conductors.Where subject to physical damageAs overhead cable, except where installed as messenger-supported wiring in accordance with Part II of Article 396 [340.12](https://2023.antflix.net#340.12)
|
https://2023.antflix.net#340.12
|
Chapter 3 Wiring Methods and Materials
|
340.24
|
Bends in Type UF cable shall be so made that the cable is not damaged. The radius of the curve of the inner edge of any bend 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. [340.24](https://2023.antflix.net#340.24)
|
https://2023.antflix.net#340.24
|
Chapter 3 Wiring Methods and Materials
|
340.80
|
The ampacity of Type UF cable shall be that of 60°C (140°F) conductors in accordance with 310.14. [340.80](https://2023.antflix.net#340.80)
|
https://2023.antflix.net#340.80
|
Chapter 3 Wiring Methods and Materials
|
340.104
|
The conductors shall be sizes 14 AWG copper or 12 AWG aluminum or copper-clad aluminum through 4/0 AWG. [340.104](https://2023.antflix.net#340.104)
|
https://2023.antflix.net#340.104
|
Chapter 3 Wiring Methods and Materials
|
340.108
|
In addition to the insulated conductors, the cable shall be permitted to have an insulated or bare equipment grounding conductor. [340.108](https://2023.antflix.net#340.108)
|
https://2023.antflix.net#340.108
|
Chapter 3 Wiring Methods and Materials
|
340.112
|
The conductors of Type UF shall be one of the moisture-resistant types listed in Table 310.4(1) that is suitable for branch-circuit wiring or one that is identified for such use. Where installed as a substitute wiring method for NM cable, the conductor insulation shall be rated 90°C (194°F). [340.112](https://2023.antflix.net#340.112)
|
https://2023.antflix.net#340.112
|
Chapter 3 Wiring Methods and Materials
|
340.116
|
The overall covering shall be flame retardant; moisture, fungus, and corrosion resistant; and suitable for direct burial in the earth. [340.116](https://2023.antflix.net#340.116)
|
https://2023.antflix.net#340.116
|
Chapter 3 Wiring Methods and Materials
|
342.1
|
This article covers the use, installation, and construction specifications for intermediate metal conduit (IMC) and associated fittings. [342.1](https://2023.antflix.net#342.1)
|
https://2023.antflix.net#342.1
|
Chapter 3 Wiring Methods and Materials
|
342.6
|
IMC, factory elbows and couplings, and associated fittings shall be listed. [342.6](https://2023.antflix.net#342.6)
|
https://2023.antflix.net#342.6
|
Chapter 3 Wiring Methods and Materials
|
342.10(A)
|
Use of IMC shall be permitted under all atmospheric conditions and occupancies. [342.10(A)](https://2023.antflix.net#342.10(A))
|
https://2023.antflix.net#342.10(A)
|
Chapter 3 Wiring Methods and Materials
|
342.10(B)
|
IMC, elbows, couplings, and fittings shall be permitted to be installed in concrete, in direct contact with the earth, in direct burial applications, or in areas subject to severe corrosive influences where protected by corrosion protection approved for the condition. [342.10(B)](https://2023.antflix.net#342.10(B))
|
https://2023.antflix.net#342.10(B)
|
Chapter 3 Wiring Methods and Materials
|
342.10(C)
|
IMC shall be permitted to be installed in or under cinder fill where subject to permanent moisture where protected on all sides by a layer of noncinder concrete not less than 50 mm (2 in.) thick; where the conduit is not less than 450 mm (18 in.) under the fill; or where protected by corrosion protection approved for the condition. [342.10(C)](https://2023.antflix.net#342.10(C))
|
https://2023.antflix.net#342.10(C)
|
Chapter 3 Wiring Methods and Materials
|
342.10(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. [342.10(D)](https://2023.antflix.net#342.10(D))
|
https://2023.antflix.net#342.10(D)
|
Chapter 3 Wiring Methods and Materials
|
342.10(E)
|
IMC shall be permitted to be installed where subject to severe physical damage. [342.10(E)](https://2023.antflix.net#342.10(E))
|
https://2023.antflix.net#342.10(E)
|
Chapter 3 Wiring Methods and Materials
|
342.14
|
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 IMC where not subject to severe corrosive influences. Stainless steel IMC 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 [342.14](https://2023.antflix.net#342.14)
|
https://2023.antflix.net#342.14
|
Chapter 3 Wiring Methods and Materials
|
342.20(A)
|
IMC smaller than metric designator 16 (trade size 1/2) shall not be used. [342.20(A)](https://2023.antflix.net#342.20(A))
|
https://2023.antflix.net#342.20(A)
|
Chapter 3 Wiring Methods and Materials
|
342.20(B)
|
IMC larger than metric designator 155 (trade size 6) 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. [342.20(B)](https://2023.antflix.net#342.20(B))
|
https://2023.antflix.net#342.20(B)
|
Chapter 3 Wiring Methods and Materials
|
342.22
|
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. [342.22](https://2023.antflix.net#342.22)
|
https://2023.antflix.net#342.22
|
Chapter 3 Wiring Methods and Materials
|
342.24(A)
|
Bends of IMC shall be so made that the conduit will not be damaged and the internal diameter of the conduit will not be effectively reduced. The radius of the curve of any field bend to the centerline of the conduit shall not be less than indicated in Table 2, Chapter 9. [342.24(A)](https://2023.antflix.net#342.24(A))
|
https://2023.antflix.net#342.24(A)
|
Chapter 3 Wiring Methods and Materials
|
342.24(B)
|
The total degrees of bends in a conduit run shall not exceed 360 degrees between pull points. [342.24(B)](https://2023.antflix.net#342.24(B))
|
https://2023.antflix.net#342.24(B)
|
Chapter 3 Wiring Methods and Materials
|
342.28
|
All cut ends shall be reamed or otherwise finished to remove rough edges. Where conduit is threaded in the field, a standard cutting die with a taper of 1 in 16 (3/4 in. taper per foot) shall be used. Informational Note: See ANSI/ASME B1.20.1-2013, Standard for Pipe Threads, General Purpose (Inch). [342.28](https://2023.antflix.net#342.28)
|
https://2023.antflix.net#342.28
|
Chapter 3 Wiring Methods and Materials
|
342.30
|
IMC shall be installed as a complete system in accordance with 300.18 and shall be securely fastened in place and supported in accordance with 342.30(A) and (B). [342.30](https://2023.antflix.net#342.30)
|
https://2023.antflix.net#342.30
|
Chapter 3 Wiring Methods and Materials
|
342.30(A)
|
IMC shall be secured in accordance with one of the following: IMC shall be securely fastened within 900 mm (3 ft) of each outlet box, junction box, device box, cabinet, conduit body, or other conduit termination.Where structural members do not readily permit fastening within 900 mm (3 ft), fastening shall be permitted to be increased to a distance of 1.5 m (5 ft).Where approved, conduit shall not be required to be securely fastened within 900 nun (3 ft) of the service head for above-the-roof termination of a mast.Exception: For concealed work in finished buildings or prefinished wall panels where such securing is impracticable, unbroken lengths (without coupling) of IMC shall be permitted to be fished. [342.30(A)](https://2023.antflix.net#342.30(A))
|
https://2023.antflix.net#342.30(A)
|
Chapter 3 Wiring Methods and Materials
|
342.30(B)
|
IMC shall be supported in accordance with one of the following: Conduit shall be supported at intervals not exceeding 3 m (10 ft).The distance between supports for straight runs of conduit shall be permitted in accordance with Table 344.30(B), provided the conduit is made up with threaded couplings and supports that prevent transmission of stresses to termination where conduit is deflected between supports.Exposed vertical risers from industrial machinery or fixed equipment shall be permitted to be supported at intervals not exceeding 6 m (20 ft) if the conduit is made up with threaded couplings, the conduit is supported and securely fastened at the top and bottom of the riser, and no other means of intermediate support is readily available.Horizontal runs of IMC supported by openings through framing members at intervals not exceeding 3 m (10 ft) and securely fastened within 900 mm (3 ft) of termination points shall be permitted. [342.30(B)](https://2023.antflix.net#342.30(B))
|
https://2023.antflix.net#342.30(B)
|
Chapter 3 Wiring Methods and Materials
|
342.42(A)
|
Threadless couplings and connectors used with conduit shall be made tight. Where buried in masonry or concrete, they shall be the concretetight type. Where installed in wet locations, they shall comply with 314.15. Threadless couplings and connectors shall not be used on threaded conduit ends unless listed for the purpose. [342.42(A)](https://2023.antflix.net#342.42(A))
|
https://2023.antflix.net#342.42(A)
|
Chapter 3 Wiring Methods and Materials
|
342.42(B)
|
Running threads shall not be used on conduit for connection at couplings. [342.42(B)](https://2023.antflix.net#342.42(B))
|
https://2023.antflix.net#342.42(B)
|
Chapter 3 Wiring Methods and Materials
|
342.46
|
Where a conduit enters a box, fitting, or other enclosure, a bushing shall be provided to protect the wires from abrasion unless the box, fitting, or enclosure is designed to provide such protection. Informational Note: See 300.4(G) for the protection of conductors 4 AWG and larger at bushings. [342.46](https://2023.antflix.net#342.46)
|
https://2023.antflix.net#342.46
|
Chapter 3 Wiring Methods and Materials
|
342.56
|
Splices and taps shall be made in accordance with 300.15. [342.56](https://2023.antflix.net#342.56)
|
https://2023.antflix.net#342.56
|
Chapter 3 Wiring Methods and Materials
|
342.60
|
IMC shall be permitted as an equipment grounding conductor. [342.60](https://2023.antflix.net#342.60)
|
https://2023.antflix.net#342.60
|
Chapter 3 Wiring Methods and Materials
|
342.100
|
IMC shall be made of one of the following: Steel, with protective coatingsStainless steel [342.100](https://2023.antflix.net#342.100)
|
https://2023.antflix.net#342.100
|
Chapter 3 Wiring Methods and Materials
|
342.120
|
Each length shall be clearly and durably marked at least every 1.5 m (5 ft) with the letters IMC. Each length shall be marked as required in the first sentence of 110.21(A). [342.120](https://2023.antflix.net#342.120)
|
https://2023.antflix.net#342.120
|
Chapter 3 Wiring Methods and Materials
|
344.1
|
This article covers the use, installation, and construction specifications for rigid metal conduit (RMC) and associated fittings. [344.1](https://2023.antflix.net#344.1)
|
https://2023.antflix.net#344.1
|
Chapter 3 Wiring Methods and Materials
|
344.6
|
RMC, factory elbows and couplings, and associated fittings shall be listed. [344.6](https://2023.antflix.net#344.6)
|
https://2023.antflix.net#344.6
|
Chapter 3 Wiring Methods and Materials
|
344.10(A)(1)
|
Galvanized steel, stainless steel, and red brass RMC shall be permitted under all atmospheric conditions and occupancies. [344.10(A)(1)](https://2023.antflix.net#344.10(A)(1))
|
https://2023.antflix.net#344.10(A)(1)
|
Chapter 3 Wiring Methods and Materials
|
344.10(A)(2)
|
Aluminum RMC shall be permitted to be installed where approved for the environment. [344.10(A)(2)](https://2023.antflix.net#344.10(A)(2))
|
https://2023.antflix.net#344.10(A)(2)
|
Chapter 3 Wiring Methods and Materials
|
344.10(A)(3)
|
Ferrous raceways and fittings protected from corrosion solely by enamel shall be permitted only indoors and in occupancies not subject to severe corrosive influences. [344.10(A)(3)](https://2023.antflix.net#344.10(A)(3))
|
https://2023.antflix.net#344.10(A)(3)
|
Chapter 3 Wiring Methods and Materials
|
344.10(B)(1)
|
Galvanized steel, stainless steel, and red brass RMC, elbows, couplings, and fittings shall be permitted to be installed in concrete, in direct contact with the earth, in direct burial applications, or in areas subject to severe corrosive influences where protected by corrosion protection approved for the condition. [344.10(B)(1)](https://2023.antflix.net#344.10(B)(1))
|
https://2023.antflix.net#344.10(B)(1)
|
Chapter 3 Wiring Methods and Materials
|
344.10(B)(2)
|
Aluminum RMC shall be provided with approved supplementary corrosion protection where encased in concrete or in direct contact with the earth, or in direct burial applications where identified for the application. [344.10(B)(2)](https://2023.antflix.net#344.10(B)(2))
|
https://2023.antflix.net#344.10(B)(2)
|
Chapter 3 Wiring Methods and Materials
|
344.10(C)
|
Galvanized steel, stainless steel, and red brass RMC shall be permitted to be installed in or under cinder fill where subject to permanent moisture where protected on all sides by a layer of noncinder concrete not less than 50 mm (2 in.) thick; where the conduit is not less than 450 mm (18 in.) under the fill; or where protected by corrosion protection approved for the condition. [344.10(C)](https://2023.antflix.net#344.10(C))
|
https://2023.antflix.net#344.10(C)
|
Chapter 3 Wiring Methods and Materials
|
344.10(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. [344.10(D)](https://2023.antflix.net#344.10(D))
|
https://2023.antflix.net#344.10(D)
|
Chapter 3 Wiring Methods and Materials
|
344.10(E)
|
RMC shall be permitted to be installed where subject to severe physical damage. [344.10(E)](https://2023.antflix.net#344.10(E))
|
https://2023.antflix.net#344.10(E)
|
Chapter 3 Wiring Methods and Materials
|
344.14
|
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 RMC, and galvanized steel fittings and enclosures shall be permitted to be used with aluminum RMC where not subject to severe corrosive influences. Stainless steel rigid conduit 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 [344.14](https://2023.antflix.net#344.14)
|
https://2023.antflix.net#344.14
|
Chapter 3 Wiring Methods and Materials
|
344.20(A)
|
RMC 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). [344.20(A)](https://2023.antflix.net#344.20(A))
|
https://2023.antflix.net#344.20(A)
|
Chapter 3 Wiring Methods and Materials
|
344.20(B)
|
RMC larger than metric designator 155 (trade size 6) 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. [344.20(B)](https://2023.antflix.net#344.20(B))
|
https://2023.antflix.net#344.20(B)
|
Chapter 3 Wiring Methods and Materials
|
344.22
|
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. [344.22](https://2023.antflix.net#344.22)
|
https://2023.antflix.net#344.22
|
Chapter 3 Wiring Methods and Materials
|
344.24(A)
|
Bends of RMC shall be so made that the conduit will not be damaged and so that the internal diameter of the conduit will not be effectively reduced. The radius of the curve of any field bend to the centerline of the conduit shall not be less than indicated in Table 2, Chapter 9 [344.24(A)](https://2023.antflix.net#344.24(A))
|
https://2023.antflix.net#344.24(A)
|
Chapter 3 Wiring Methods and Materials
|
344.24(B)
|
The total degrees of bends in a conduit run shall not exceed 360 degrees between pull points. [344.24(B)](https://2023.antflix.net#344.24(B))
|
https://2023.antflix.net#344.24(B)
|
Chapter 3 Wiring Methods and Materials
|
344.28
|
All cut ends shall be reamed or otherwise finished to remove rough edges. Where conduit is threaded in the field, a standard cutting die with a 1 in 16 taper (3/4 in. taper per foot) shall be used. PVC-coated RMC shall be threaded in accordance with manufacturer's instructions to prevent damage to the exterior coating. Informational Note No. 1: See ANSI/ASME B1.20.1-2013, Standard for Pipe Threads, General Purpose (Inch). Informational Note No. 2: See NECA 101-2013, Standard for Installing Steel Conduits (RMC, IMC, EMT), for information on threading and clamping methods for RMC and PVC-coated RMC. [344.28](https://2023.antflix.net#344.28)
|
https://2023.antflix.net#344.28
|
Chapter 3 Wiring Methods and Materials
|
344.30
|
RMC shall be installed as a complete system in accordance with 300.18 and shall be securely fastened in place and supported in accordance with 344.30(A) and (B). [344.30](https://2023.antflix.net#344.30)
|
https://2023.antflix.net#344.30
|
Chapter 3 Wiring Methods and Materials
|
344.30(A)
|
RMC shall be secured in accordance with one of the following: RMC shall be securely fastened within 900 mm (3 ft) of each outlet box, junction box, device box, cabinet, conduit body, or other conduit termination.Fastening 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).Where approved, conduit shall not be required to be securely fastened within 900 mm (3 ft) of the service head for above-the-roof termination of a mast.Exception: For concealed work in finished buildings or prefinished wall panels where such securing is impracticable, unbroken lengths (without coupling) of RMC shall be permitted to be fished, [344.30(A)](https://2023.antflix.net#344.30(A))
|
https://2023.antflix.net#344.30(A)
|
Chapter 3 Wiring Methods and Materials
|
344.30(B)
|
RMC shall be supported in accordance with one of the following: Conduit shall be supported at intervals not exceeding 3 m (10 ft).The distance between supports for straight runs of conduit shall be permitted in accordance with Table 344.30(B), provided the conduit is made up with threaded couplings and supports that prevent transmission of stresses to termination where conduit is deflected between supports.Exposed vertical risers from industrial machinery or fixed equipment shall be permitted to be supported at intervals not exceeding 6 m (20 ft) if the conduit is made up with threaded couplings, the conduit is supported and securely fastened at the top and bottom of the riser, and no other means of intermediate support is readily available.Horizontal runs of RMC supported by openings through framing members at intervals not exceeding 3 m (10 ft) and securely fastened within 900 mm (3 ft) of termination points shall be permitted.Table 344.30(B) Supports for Rigid Metal Conduit Conduit Size Maximum Distance Between Rigid Metal Conduit Supports Metric Designator Trade Size m ft 16—21 1/2—3/4 3.0 10 27 1 3.7 12 35—41 11/4—11/2 4.3 14 53—63 2—21/2 4.9 16 78 and larger 3 and larger 6.1 20 [344.30(B)](https://2023.antflix.net#344.30(B))
|
https://2023.antflix.net#344.30(B)
|
Chapter 3 Wiring Methods and Materials
|
344.42(A)
|
Threadless couplings and connectors used with conduit shall be made tight. Where buried in masonry or concrete, they shall be the concrete tight type. Where installed in wet locations, they shall comply with 314.15. Threadless couplings and connectors shall not be used on threaded conduit ends unless listed for the purpose. [344.42(A)](https://2023.antflix.net#344.42(A))
|
https://2023.antflix.net#344.42(A)
|
Chapter 3 Wiring Methods and Materials
|
344.42(B)
|
Running threads shall not be used on conduit for connection at couplings. [344.42(B)](https://2023.antflix.net#344.42(B))
|
https://2023.antflix.net#344.42(B)
|
Chapter 3 Wiring Methods and Materials
|
344.46
|
Where a conduit enters a box, fitting, or other enclosure, a bushing shall be provided to protect the wires from abrasion unless the box, fitting, or enclosure is designed to provide such protection. Informational Note: See 300.4(G) for the protection of conductors sizes 4 AWG and larger at bushings. [344.46](https://2023.antflix.net#344.46)
|
https://2023.antflix.net#344.46
|
Chapter 3 Wiring Methods and Materials
|
344.56
|
Splices and taps shall be made in accordance with 300.15. [344.56](https://2023.antflix.net#344.56)
|
https://2023.antflix.net#344.56
|
Chapter 3 Wiring Methods and Materials
|
344.60
|
RMC shall be permitted as an equipment grounding conductor. [344.60](https://2023.antflix.net#344.60)
|
https://2023.antflix.net#344.60
|
Chapter 3 Wiring Methods and Materials
|
344.100
|
RMC shall be made of one of the following: Steel with protective coatingsAluminumRed brassStainless steel [344.100](https://2023.antflix.net#344.100)
|
https://2023.antflix.net#344.100
|
Chapter 3 Wiring Methods and Materials
|
344.120
|
Each length shall be clearly and durably identified in every 3 m (10 ft) as required in the first sentence of 110.21(A). Nonferrous conduit of corrosion-resistant material shall have suitable markings. [344.120](https://2023.antflix.net#344.120)
|
https://2023.antflix.net#344.120
|
Chapter 3 Wiring Methods and Materials
|
348.1
|
This article covers the use, installation, and construction specifications for flexible metal conduit (FMC) and associated fittings. [348.1](https://2023.antflix.net#348.1)
|
https://2023.antflix.net#348.1
|
Chapter 3 Wiring Methods and Materials
|
348.2
|
FMC shall not be reconditioned. [348.2](https://2023.antflix.net#348.2)
|
https://2023.antflix.net#348.2
|
Chapter 3 Wiring Methods and Materials
|
348.6
|
FMC and associated fittings shall be listed. [348.6](https://2023.antflix.net#348.6)
|
https://2023.antflix.net#348.6
|
Chapter 3 Wiring Methods and Materials
|
348.10
|
FMC shall be permitted to be used in exposed and concealed locations. [348.10](https://2023.antflix.net#348.10)
|
https://2023.antflix.net#348.10
|
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