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Chapter 7 Special Conditions | 722.135(E) | The substitutions for cables listed in Table 722.135(E) shall be permitted. Where substitute cables are installed, the installation requirements of the articles described in 722.3(0) shall also apply. CI cables shall be permitted to be installed to provide 2-hour circuit integrity. See 722.135(F). Informational Note: See 800.179 for information on Types CMP, CMR, CM, and CMX. [722.135(E)](https://2023.antflix.net#722.135(E)) | https://2023.antflix.net#722.135(E) |
Chapter 7 Special Conditions | 722.135(F) | CI cable, a fire-resistive cable system, or a listed electrical circuit protective system shall be permitted for use in systems that supply critical circuits to ensure survivability for continued circuit operation for a specified time under fire conditions. [722.135(F)](https://2023.antflix.net#722.135(F)) | https://2023.antflix.net#722.135(F) |
Chapter 7 Special Conditions | 722.135(G) | Conductors in Type PLTC cables used for Class 2 thermocouple circuits shall be permitted to be any of the materials used for thermocouple extension wire. [722.135(G)](https://2023.antflix.net#722.135(G)) | https://2023.antflix.net#722.135(G) |
Chapter 7 Special Conditions | 722.135(H) | Where 4-pair cables are used to transmit power and data to a powered device, 725.144 shall apply. [722.135(H)](https://2023.antflix.net#722.135(H)) | https://2023.antflix.net#722.135(H) |
Chapter 7 Special Conditions | 722.135(I) | Circuit conductors that extend beyond one building and are run such that they are subject to accidental contact with electric light or power conductors operating over 300 volts to ground, or are exposed to lightning on interbuilding circuits on the same premises, shall comply with the following: For other than coaxial conductors, 800.44, 800.53, 800.100, 805.50, 805.93, 805.170(A), and 805.170(B)For coaxial conductors, 800.44, 820.93, and 820.100The installation requirements of Part I of Article 300Table 722.135(B) Installation of Listed Cables in Buildings Applications Cable Type1 Plenum Riser General-Purpose Limited-Use Under Carpet PLTC In ducts specifically fabricated for environmental air as described in 300.22(B)2 Cables in lengths as short as practicable to perform the required function Y N N N N N In metal raceway that complies with 300.22(B) Y Y Y Y N Y In other spaces used for environmental air (plenums) as described in 300.22(C) Cables in other spaces used for environmental air Y N N N N N Cables in metal raceway that complies with 300.22(C) Y Y Y Y N Y Cables in plenum communications raceways Y N N N N N Cables in plenum cable routing assemblies Y N N N N N Cables supported by open metal cable trays Y N N N N N Cables or cables installed in raceways or cable routing assemblies supported by solid bottom metal cable trays with solid metal covers Y Y Y Y N Y In risers and vertical runs Cables in vertical runs penetrating one or more floors and in vertical runs in a shaft Y Y N N N N Cables in metal raceways Y Y Y Y N Y Cables in fireproof shafts Y Y Y N N Y Cables in plenum communications raceways Y Y N N N N Cables in plenum cable routing assemblies Y Y N N N N Cables in riser communications raceways Y Y N N N N Cables in riser cable routing assemblies Y Y N N N N Cables in one- and two-family dwellings Y Y Y Y3 N Y Cables and innerducts installed in metal raceways in a riser having firestops at each floor2 Cables Y Y Y Y N Y Cables in plenum communications raceways(innerduct) Y Y Y Y N Y Cables in riser communications raceways (innerduct) Y Y Y Y N Y Cables in general-purpose communications raceways (innerduct) Y Y Y Y N Y In fireproof riser shafts having firestops at each floor2 Cables Y Y Y N N Y Cables in plenum communications raceways or plenum cable routing assemblies Y Y Y N N Y Cables in riser communications raceways or riser cable routing assemblies Y Y Y N N Y Cables in general-purpose communications raceways or general-purpose cable routing assemblies Y Y Y N N Y In cable trays Outdoors N N N N N Y Cables, or cables in plenum, riser, or general-purpose communications raceways, installed indoors Y Y Y N N Y In cross-connect arrays Cables, and cables in plenum, riser, or general-purpose communications raceways or cable routing assemblies Y Y Y N N Y In one-, two-, and multifamily dwellings, and in building locations other than the locations covered above Cables Y Y Y Y3 N Y Cables in plenum, riser, or general-purpose communications raceways or cable routing assemblies, or raceways recognized in Chapter 3 Y Y Y Y N Y Cables in nonconcealed spaces Y Y Y Y4 Y Y Under carpet, floor covering, modular flooring, and planks N N N N Y N 1"N" indicates that the cable type shall not be installed in the application. "Y" indicates that the cable type shall be permitted to be installed in the application, subject to any limitations described in this article or the articles described in 722.3(O).2In 300.22(B), cables shall be permitted in ducts specifically fabricated for environmental air only if directly associated with the air distribution system.3Limited-use cable shall be permitted to be installed only in one-, two-, and multifamily dwellings and only if the cable is smaller in diameter than 6.35 mm (0.25 in.).4The exposed length of cable shall not exceed 3.05 m (10 ft).Table 722.135(E) Cable Substitutions Cable Type Permitted Substitutions CL3P CMP CL2P CMP, CL3P CL3R CMP, CL3P, CMR CL2R CMP, CL3P, CL2P, CMR, CL3R PLTC None CL3 CMP, CL3P, CMR, CL3R, CMG, CM, PLTC CL2 CMP, CL3P, CL2P, CMR, CL3R, CL2R, CMG, CM, PLTC, CL3 CL3X CMP, CL3P, CMR, CL3R, CMG, CM, PLTC, CL3, CMX CL2X CMP, CL3P, CL2P, CMR, CL3R, CL2R, CMG, CM, PLTC, CL3, CL2, CMX, CL3X FPLP CMP FPLR CMP, FPLP, CMR FPL CMP, FPLP, CMR, FPLR, CMG, CM OFNP None OFCP OFNP OFNR OFNP OFCR OFNP, OFCP, OFNR OFNG, OFN OFNP, OFNR OFCG, OFC OFNP, OFCP, OFNR, OFCR, OFNG, OFN CMUC None [722.135(I)](https://2023.antflix.net#722.135(I)) | https://2023.antflix.net#722.135(I) |
Chapter 7 Special Conditions | 722.179 | Cables installed in buildings shall be listed in accordance with 722.179(A) and marked in accordance with 722.179(B), and they shall be permitted to be marked in accordance with 722.179(C). Exception: Optical fiber cables that are installed in compliance with 770.48 shall not be required to be listed. [722.179](https://2023.antflix.net#722.179) | https://2023.antflix.net#722.179 |
Chapter 7 Special Conditions | 722.179(A) | Cables installed as wiring methods within buildings shall be listed as resistant to the spread of fire and other criteria in accordance with 722.179(A)(1) through (A) (16). Informational Note No. 1: See UL 13, Standard for Power-Limited Circuit Cables, for applicable requirements for listing of Class 2 and Class 3 cable and power-limited tray cable (PLTC). Informational Note No. 2: See UL 1424, Cables for Power-Limited Fire-Alarm Circuits, for applicable requirements for listing of power-limited fire alarm cable. Informational Note No. 3: See UL 1651, Optical Fiber Cable, for applicable requirements for listing of optical fiber cable. Informational Note No. 4: See UL 1400-2, Outline for Fault-Managed Power Systems - Part 2: Requirements for Class 4 Cables, for applicable requirements for listing of Class 4 cable. [722.179(A)](https://2023.antflix.net#722.179(A)) | https://2023.antflix.net#722.179(A) |
Chapter 7 Special Conditions | 722.179(A)(1) | Plenum cable shall be listed as suitable for use in ducts, plenums, and other space for environmental air and shall be listed as having adequate fire-resistant and low-smoke producing characteristics. Refer to Table 722.179(B) for plenum cable types. Informational Note: See NFPA 262-2019, Standard Method of Test for Flame Travel and Smoke of Wires and Cables for Use in Air-Handling Spaces, for the test method used to determine that a cable is low-smoke producing and fire resistant, exhibiting a maximum peak optical density of 0.50 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.52 m (5 ft) or less. [722.179(A)(1)](https://2023.antflix.net#722.179(A)(1)) | https://2023.antflix.net#722.179(A)(1) |
Chapter 7 Special Conditions | 722.179(A)(2) | Riser cable shall be listed as suitable for use in a vertical run in a shaft or from floor to floor and shall be listed as having fire-resistant characteristics capable of preventing the carrying of fire from floor to floor. Informational Note: See ANSI/UL 1666-2012, Test for Flame Propagation Height of Electrical and Optical-Fiber Cable Installed Vertically in Shafts, for the cable requirements defining fire-resistant characteristics capable of preventing the carrying of fire from floor to floor. [722.179(A)(2)](https://2023.antflix.net#722.179(A)(2)) | https://2023.antflix.net#722.179(A)(2) |
Chapter 7 Special Conditions | 722.179(A)(3) | General-purpose cable shall be listed as resistant to the spread of fire and as suitable for general-purpose use, except for use in risers, ducts, plenums, and other space used for environmental air. Informational Note: See UL 2556, Wire and Cable lest Methods, for defining resistant to the spread of fire. One method is to demonstrate that the cables do not spread fire to the top of the tray in the UL Flame Exposure, Vertical Tray Flame Test. The smoke measurements in the test method are not applicable. A 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 FT4 Vertical Flame Test. [722.179(A)(3)](https://2023.antflix.net#722.179(A)(3)) | https://2023.antflix.net#722.179(A)(3) |
Chapter 7 Special Conditions | 722.179(A)(4) | Alternative general-purpose optical fiber cable shall be listed as suitable for general-purpose use, with the exception of risers and plenums, and shall also be resistant to the spread of fire. Informational Note: See CSA C22.2 No. 0.3-M-2001, Test Methods for Electrical Wires and Cables, for the CSA vertical flame test - cables in cable trays, that can also be used to define resistance to the spread of fire when the damage (char length) does not exceed 1.5 m (4 ft 11 in.). [722.179(A)(4)](https://2023.antflix.net#722.179(A)(4)) | https://2023.antflix.net#722.179(A)(4) |
Chapter 7 Special Conditions | 722.179(A)(5) | Limited-use cable shall be listed as suitable for use in dwellings and raceways and shall be listed as resistant to flame spread. Informational Note: See ANSI/UL 2556, Standard for Wire and Cable Test Methods, for one method of determining that cable is resistant to flame spread by testing the cable to the FV-2/VW-1 test. [722.179(A)(5)](https://2023.antflix.net#722.179(A)(5)) | https://2023.antflix.net#722.179(A)(5) |
Chapter 7 Special Conditions | 722.179(A)(6) | Type PLTC nonmetallic-sheathed, power-limited tray cable shall be listed as being suitable for cable trays, resistant to the spread of fire, and sunlight- and moisture-resistant. Type PLTC cable used in a wet location shall be listed for use in wet locations and marked "wet" or "wet location." Informational Note: See ANSI/UL 1685-2010, Standard for Safety for Vertical-Tray Fire-Propagation and Smoke-Release Test for Electrical and Optical-Fiber Cables, for the UL flame exposure, vertical tray flame test that is used to determine resistance to the spread of fire when cables do not spread fire to the top of the tray. The smoke measurements in the test method are not applicable. See CSA C22.2 No. 0.3-M-2001, Test Methods for Electrical Wires and Cables, for the CSA vertical flame test - cables in cable trays that can also be used to define resistance to the spread of fire when the damage (char length) does not exceed 1.5 m (4 ft 11 in.). [722.179(A)(6)](https://2023.antflix.net#722.179(A)(6)) | https://2023.antflix.net#722.179(A)(6) |
Chapter 7 Special Conditions | 722.179(A)(7) | Cables that are used for survivability of critical circuits under fire conditions shall comply with either 722.179(A)(7)(a), (A)(7)(b), or (A)(7)(c). Informational Note: See NFPA 72, National Fire Alarm and Signaling Code, 12.4.3 and 12.4.4, for additional information on fire alarm CI cable, fire-resistive cable systems, or electrical circuit protective systems used for fire alarm circuits to comply with the survivability requirements to maintain the circuit's electrical function during fire conditions for a defined period of time.CI Cables. CI cables of the types specified in 722.179(A)(1), (A)(2), (A)(3), (A)(4), and (A)(6) and used for survivability of critical circuits shall be marked with the additional classification using the suffix "CI" To maintain its listed fire-resistive rating, CI cable shall only be installed in free air in accordance with 722.24(C). CI cables shall only be permitted to be installed in a raceway where specifically listed and marked as part of a fire-resistive cable system as covered in 722.179(A)(7)(b).Informational Note: See UL 2196, Fire Test for Circuit Integrity of Fire-Resistive Power, Instrumentation, Control and Data Cables, and UL 1425, Cables for Non—Power-Limited Fire-Alarm Circuits, for information on establishing a rating for CI cable. The UL Guide Information for Nonpower-limited Fire Alarm Circuits (HNHT) contains information to identify the cable and its installation limitations to maintain the fire-resistive rating.Fire-Resistive Cables. Fire-resistive cables of the types specified in 722.179(A)(1), (A)(2), (A)(3), (A)(4), (A)(6), and (A)(7)(a) that are part of a fire-resistive cable system shall be identified with the system identifier and hourly rating marked on the protectant or the smallest unit container and installed in accordance with the listing of the system.Informational Note: See UL 2196, Fire Test for Circuit Integrity of Fire-Resistive Power, Instrumentation, Control and Data Cables, for information on establishing a rating for a fire-resistive cable system. The UL Guide Information for Electrical Circuit Integrity Systems (FHIT) contains information to identify the system and its installation limitations to maintain a minimum fire-resistive rating.Electrical Circuit Protective System. Protectants for cables of the types specified in 722.179(A)(1), (A)(2), (A)(3), (A)(4), and (A)(6) that are part of an electrical circuit protective system shall be identified with the protective system identifier and hourly rating marked on the protectant or the smallest unit container and installed in accordance with the listing of the protective system.Informational Note: See UL 1724, Fire Tests for Electrical Circuit Protective Systems, for information on establishing a rating for an electrical circuit protective system. The UL Guide Information for Electrical Circuit Integrity Systems (FHIT) contains information to identify the system and its installation limitations to maintain the fire-resistive rating. [722.179(A)(7)](https://2023.antflix.net#722.179(A)(7)) | https://2023.antflix.net#722.179(A)(7) |
Chapter 7 Special Conditions | 722.179(A)(8) | Class 3 single conductors used as other wiring within buildings shall be listed Type CL3 and shall not be smaller than 18 AWG. Informational Note: See ANSI/UL 1685-2010, Standard for Safety for Vertical-Tray Fire-Propagation and Smoke-Release Test for Electrical and Optical-Fiber Cables, for the UL flame exposure, vertical tray flame test that is used to determine resistance to the spread of fire when cables do not spread fire to the top of the tray. The smoke measurements in the test method are not applicable. See CSA C22.2 No. 0.3-M-2001, Test Methods for Electrical Wires and Cables, for the CSA vertical flame test - cables in cable trays that can also be used to define resistance to the spread of fire when the damage (char length) does not exceed 1.5 m (4 ft 11 in.). [722.179(A)(8)](https://2023.antflix.net#722.179(A)(8)) | https://2023.antflix.net#722.179(A)(8) |
Chapter 7 Special Conditions | 722.179(A)(9) | Class 2 and Class 3 LP cables shall be listed as suitable for carrying power and data up to a specified current limit for each conductor without exceeding the temperature rating of the cable. The cables shall be marked with the suffix "-LP (XXA)" where XXA designates the current limit in amperes per conductor. Informational Note: An example of the marking on 23 AWG, 4-pair, Class 2 cable rated 75°C with an LP current rating of 0.6 amperes per conductor is "CL2-LP (0.6A) 75°C 23 AWG 4-pair." [722.179(A)(9)](https://2023.antflix.net#722.179(A)(9)) | https://2023.antflix.net#722.179(A)(9) |
Chapter 7 Special Conditions | 722.179(A)(10) | Undercarpet cable shall be listed as suitable for use under carpet, floor covering, modular tiles, and planks. Informational Note: See UL 444, Standard for Safety for Communications Cables, for the compressive loading test used to determine the suitability of cable for undercarpet use. [722.179(A)(10)](https://2023.antflix.net#722.179(A)(10)) | https://2023.antflix.net#722.179(A)(10) |
Chapter 7 Special Conditions | 722.179(A)(11) | Cable used in a wet location shall be listed for use in wet locations and be marked "wet" or "wet location" or have a moisture-impervious metal sheath. [722.179(A)(11)](https://2023.antflix.net#722.179(A)(11)) | https://2023.antflix.net#722.179(A)(11) |
Chapter 7 Special Conditions | 722.179(A)(12) | Field-assembled optical fiber cable shall comply with 722.179(A) (12) (a) through (d). The specific combination of jacket and optical fibers intended to be installed as a field-assembled optical fiber cable shall be one of the types in 722.179(A)(1), (A)(2), or (A)(3) and shall be marked in accordance with Table 179(B).The jacket of a field-assembled optical fiber cable shall have a surface marking indicating the specific optical fibers with which it is identified for use.The optical fibers shall have a permanent marking, such as a marker tape, indicating the jacket with which they are identified for use.The jacket without fibers shall meet the listing requirements for communications raceways in 800.182(A), (B), or (C) in accordance with the cable marking. [722.179(A)(12)](https://2023.antflix.net#722.179(A)(12)) | https://2023.antflix.net#722.179(A)(12) |
Chapter 7 Special Conditions | 722.179(A)(13) | Composite optical fiber cables shall be listed as electrical cables based on the type of electrical conductors. [722.179(A)(13)](https://2023.antflix.net#722.179(A)(13)) | https://2023.antflix.net#722.179(A)(13) |
Chapter 7 Special Conditions | 722.179(A)(14) | Class 2 cables shall have a voltage rating of not less than 150 volts. Class 3 cables shall have a voltage rating of not less than 300 volts. Class 2 and Class 3 cables shall have a temperature rating of not less than 60°C (140°F). [722.179(A)(14)](https://2023.antflix.net#722.179(A)(14)) | https://2023.antflix.net#722.179(A)(14) |
Chapter 7 Special Conditions | 722.179(A)(15) | PFLA cables shall comply with 722.179(A) (15) (a) through (A)(15)(d). Conductors for cables, other than coaxial cables, shall be solid or stranded copper. Coaxial cables shall be permitted to use 30 percent conductivity copper-covered steel center conductor wire.The size of conductors in a multiconductor cable shall not be smaller than 26 AWG. Single conductors shall not be smaller than 18 AWG. Conductors of 26 AWG shall be permitted only where spliced with a connector listed as suitable for 26 AWG to 24 AWG or larger conductors that are terminated on equipment or where the 26 AWG conductors are terminated on equipment listed as suitable for 26 AWG conductors.Cables shall have a voltage rating of not less than 300 volts.Cables shall have a temperature rating of not less than 60°C (140°F). [722.179(A)(15)](https://2023.antflix.net#722.179(A)(15)) | https://2023.antflix.net#722.179(A)(15) |
Chapter 7 Special Conditions | 722.179(A)(16)(1) | Conductors of sizes not smaller than 24 AWG shall be permitted to be used. [722.179(A)(16)(1)](https://2023.antflix.net#722.179(A)(16)(1)) | https://2023.antflix.net#722.179(A)(16)(1) |
Chapter 7 Special Conditions | 722.179(A)(16)(2) | Insulation on conductors shall be rated not less than 450 volts dc. [722.179(A)(16)(2)](https://2023.antflix.net#722.179(A)(16)(2)) | https://2023.antflix.net#722.179(A)(16)(2) |
Chapter 7 Special Conditions | 722.179(A)(16)(3) | Cables shall have a voltage rating of not less than 450 volts dc. Voltage ratings shall not be marked on the cables. [722.179(A)(16)(3)](https://2023.antflix.net#722.179(A)(16)(3)) | https://2023.antflix.net#722.179(A)(16)(3) |
Chapter 7 Special Conditions | 722.179(A)(16)(4) | Cables shall have a temperature rating of not less than 60°C (140°F). [722.179(A)(16)(4)](https://2023.antflix.net#722.179(A)(16)(4)) | https://2023.antflix.net#722.179(A)(16)(4) |
Chapter 7 Special Conditions | 722.179(A)(16)(5) | Cables shall comply with any requirements provided in the listing of the system. Informational Note: See UL 1400-1, Outline for Fault-Managed Power Distribution Technologies - Part 1: General Requirements, for information on determining applicable requirements for the listing of Class 4 power systems. Excessive cable lengths can result in higher capacitance which could affect the safety of the circuit. [722.179(A)(16)(5)](https://2023.antflix.net#722.179(A)(16)(5)) | https://2023.antflix.net#722.179(A)(16)(5) |
Chapter 7 Special Conditions | 722.179(B) | Cables shall be durably marked on the surface in accordance with the following: The AWG size or circular mil area shall be repeated at intervals not exceeding 610 mm (24 in.).All other markings shall be repeated at intervals not exceeding 1.0 m (40 in.).The proper type designation for the type of cable shall be marked in accordance with Table 722.179(B).The manufacturer's name, trademark, or other distinctive marking by which the organization responsible for the product can be readily identified shall be marked.The AWG size or circular mil area shall be marked.Informational Note No. 1: See Chapter 9, Table 8, for conductor area expressed in SI units for conductor sizes specified in AWG or circular mil area.The temperature rating for a temperature rating exceeding 60°C (140°F) shall be marked.Informational Note No. 2: A minimum temperature rating of 60°C is assumed for cables not marked with a temperature rating.Voltage ratings shall not be marked on the cables.Exception: Voltage markings shall be permitted where the cable has multiple listings and a voltage marking is required for one or more of the listings.Informational Note No. 3: Voltage markings on cables could be misinterpreted to suggest that the cables may be suitable for Class 1 electric light and power applications.Informational Note No. 4: Cable types are listed in descending order of tire resistance rating. [722.179(B)](https://2023.antflix.net#722.179(B)) | https://2023.antflix.net#722.179(B) |
Chapter 7 Special Conditions | 722.179(C) | Cables shall be permitted to be surface marked to indicate special characteristics of the cable materials. Informational Note No. 1: Examples of these characteristics include, but are not limited to, limited smoke, halogen free, low smoke and halogen free, and sunlight resistant. Informational Note No. 2: Some examples of optional markings are STI to indicate limited smoke characteristics. See UL 2556, Wire and Cable Test Methods; HF to indicate halogen free. See in UL 2885, Outline of Investigation for Acid Gas, Acidity and Conductivity of Combusted Materials; and LSHF to indicate halogen free and low-smoke characteristics. See IEC 61034-2, Measurement of smoke density of cables burning under defined conditions - Part 2: Test procedure and requirements. Table 722.179(B) Cable Type Markings Cable Type Cable Marking Class 4 plenum cable CL4P Class 3 plenum cable CL3P Class 2 plenum cable CL2P Power-limited fire alarm plenum cable FPLP Nonconductive optical fiber plenum cable OFNP Conductive optical fiber plenum cable OFCP Class 4 riser cable CL4R Class 3 riser cable CL3R Class 2 riser cable CL2R Power-limited fire alarm riser cable FPLR Nonconductive optical fiber riser cable OFNR Conductive optical fiber riser cable OFCR Class 4 general-purpose cable CL4 Class 3 general-purpose cable CL3 Class 2 general-purpose cable CL2 Power-limited fire alarm cable FPL Nonconductive general-purpose optical fiber cable OFN Conductive general-purpose optical fiber cable OFC Alternative nonconductive general-purpose optical fiber cable OFNG Alternative conductive general-purpose optical fiber cable OFCG Class 3 cable - limited use CL3X Class 2 cable - limited use CL2X Undercarpet cable CMUC Note: All types of CL2, CL3, and FPL cables containing optical fibers are provided with the suffix "-OF." [722.179(C)](https://2023.antflix.net#722.179(C)) | https://2023.antflix.net#722.179(C) |
Chapter 7 Special Conditions | 724.1 | This article covers Class 1 circuits, including power-limited Class 1 remote-control and signaling circuits, that are not an integral part of a device or utilization equipment. Informational Note: See 300.26 for classifications of remote-control and signaling circuits. [724.1](https://2023.antflix.net#724.1) | https://2023.antflix.net#724.1 |
Chapter 7 Special Conditions | 724.3 | In addition to the requirements of this article, circuits and equipment shall comply with 724.3(A) through (J). [724.3](https://2023.antflix.net#724.3) | https://2023.antflix.net#724.3 |
Chapter 7 Special Conditions | 724.3(A) | The number and size of conductors shall comply with 300.17. [724.3(A)](https://2023.antflix.net#724.3(A)) | https://2023.antflix.net#724.3(A) |
Chapter 7 Special Conditions | 724.3(B) | Installation of Class 1 circuits shall comply with 300.21. [724.3(B)](https://2023.antflix.net#724.3(B)) | https://2023.antflix.net#724.3(B) |
Chapter 7 Special Conditions | 724.3(C) | Class 1 circuits installed in ducts, plenums, and other spaces used for environmental air shall comply with 300.22. [724.3(C)](https://2023.antflix.net#724.3(C)) | https://2023.antflix.net#724.3(C) |
Chapter 7 Special Conditions | 724.3(D) | Class 1 circuits shall not be installed in any hazardous (classified) locations except as permitted by other articles of this Code. [724.3(D)](https://2023.antflix.net#724.3(D)) | https://2023.antflix.net#724.3(D) |
Chapter 7 Special Conditions | 724.3(E) | Cable tray installations shall comply with Parts I and II of Article 392. [724.3(E)](https://2023.antflix.net#724.3(E)) | https://2023.antflix.net#724.3(E) |
Chapter 7 Special Conditions | 724.3(F) | Installation of raceways shall comply with 300.7 (A). [724.3(F)](https://2023.antflix.net#724.3(F)) | https://2023.antflix.net#724.3(F) |
Chapter 7 Special Conditions | 724.3(G) | Vertical installations of circuit integrity (CI) cables and conductors installed in a raceway or conductors and cables of electrical circuit protective systems shall comply with 300.19. [724.3(G)](https://2023.antflix.net#724.3(G)) | https://2023.antflix.net#724.3(G) |
Chapter 7 Special Conditions | 724.3(H) | Bushings shall be installed where cables emerge from raceways used for mechanical support or protection in accordance with 300.15(C). [724.3(H)](https://2023.antflix.net#724.3(H)) | https://2023.antflix.net#724.3(H) |
Chapter 7 Special Conditions | 724.3(I) | Installation of conductors with other systems shall comply with 300.8. [724.3(I)](https://2023.antflix.net#724.3(I)) | https://2023.antflix.net#724.3(I) |
Chapter 7 Special Conditions | 724.3(J) | Equipment grounding conductors shall be identified in accordance with 250.119. [724.3(J)](https://2023.antflix.net#724.3(J)) | https://2023.antflix.net#724.3(J) |
Chapter 7 Special Conditions | 724.21 | Access to electrical equipment shall not be denied by an accumulation of wires and cables preventing the removal of panels, including suspended ceiling panels. [724.21](https://2023.antflix.net#724.21) | https://2023.antflix.net#724.21 |
Chapter 7 Special Conditions | 724.24 | Class 1 circuits shall be installed in a neat and workmanlike manner. Cables and conductors installed exposed on the surfaces of ceilings and sidewalls shall be supported by the building structure such that the cable will not be damaged by normal building use. Such cables shall be supported by straps, staples, hangers, cable ties, or similar fittings that are designed and installed to not damage the cable. The installation shall also comply with the requirements of 300.4 and 300.11. Informational Note: Paint, plaster, cleaners, abrasives, corrosive residues, or other contaminants can result in an undetermined alteration of Class 1 cable properties. [724.24](https://2023.antflix.net#724.24) | https://2023.antflix.net#724.24 |
Chapter 7 Special Conditions | 724.30 | Class 1 circuits shall be identified at terminal and junction locations in a manner that prevents unintentional interference with other circuits during testing and servicing. [724.30](https://2023.antflix.net#724.30) | https://2023.antflix.net#724.30 |
Chapter 7 Special Conditions | 724.31 | If controlling safety-control equipment, Class 1 circuits shall be provided with physical protection if the failure of such equipment to operate introduces a direct fire or life hazard. All conductors of such circuits shall be installed in rigid metal conduit, intermediate metal conduit, rigid nonmetallic conduit, electrical metallic tubing, Type MI cable, or Type MC cable, or be otherwise suitably protected from physical damage. [724.31](https://2023.antflix.net#724.31) | https://2023.antflix.net#724.31 |
Chapter 7 Special Conditions | 724.40 | Class 1 circuits shall be supplied from a source with a rated output of not more than 30 volts and 1000 volt-amperes. [724.40](https://2023.antflix.net#724.40) | https://2023.antflix.net#724.40 |
Chapter 7 Special Conditions | 724.40(A) | Transformers shall be permitted to supply Class 1 circuits. Informational Note: See Parts I and II of Article 450 for information on transformers used to supply a Class 1 circuit. [724.40(A)](https://2023.antflix.net#724.40(A)) | https://2023.antflix.net#724.40(A) |
Chapter 7 Special Conditions | 724.40(B) | Power sources other than transformers shall be protected by overcurrent devices rated at not more than 167 percent of the volt-ampere rating of the source divided by the rated voltage. The overcurrent devices shall not be interchangeable with overcurrent devices of higher ratings. The overcurrent device shall be permitted to be an integral part of the power supply. To comply with the 1000 volt-ampere limitation of 724.40, the maximum output (VAmax) of power sources other than transformers shall be limited to 2500 volt-amperes, and the product of the maximum current (Imax) and maximum voltage (Vmax) shall not exceed 10,000 volt-amperes. These ratings shall be determined with any overcurrent-protective device bypassed. VAmax is the maximum volt-ampere output after one minute of operation regardless of load and with overcurrent protection bypassed, if used. Current-limiting impedance shall not be bypassed when determining VAmax. Imax is the maximum output current under any noncapacitive load, including short circuit, and with overcurrent protection bypassed, if used. Current-limiting impedance should not be bypassed when determining Where a current-limiting impedance listed for the purpose or as part of a listed product is used in combination with a stored energy source, such as a storage battery, to limit the output current, Imax limits apply after 5 seconds. Vmax is the maximum output voltage regardless of load with rated input applied. [724.40(B)](https://2023.antflix.net#724.40(B)) | https://2023.antflix.net#724.40(B) |
Chapter 7 Special Conditions | 724.43 | Overcurrent protection for conductors 14 AWG and larger shall be provided in accordance with the conductor ampacity, without applying the ampacity adjustment and correction factors specified in 310.15 to the ampacity calculation. Overcurrent protection shall not exceed 7 amperes for 18 AWG conductors and 10 amperes for 16 AWG. Exception: Where other articles of this Code permit or require other overcurrent protection. [724.43](https://2023.antflix.net#724.43) | https://2023.antflix.net#724.43 |
Chapter 7 Special Conditions | 724.45 | Overcurrent devices shall be located as specified in 724.45(A) through (E). [724.45](https://2023.antflix.net#724.45) | https://2023.antflix.net#724.45 |
Chapter 7 Special Conditions | 724.45(A) | Overcurrent devices shall be located at the point where the conductor to be protected receives its supply. [724.45(A)](https://2023.antflix.net#724.45(A)) | https://2023.antflix.net#724.45(A) |
Chapter 7 Special Conditions | 724.45(B) | Class 1 circuit conductors shall be permitted to be tapped, without overcurrent protection at the tap, where the overcurrent device protecting the circuit conductor is sized to protect the tap conductor. [724.45(B)](https://2023.antflix.net#724.45(B)) | https://2023.antflix.net#724.45(B) |
Chapter 7 Special Conditions | 724.45(C) | Class 1 circuit conductors 14 AWG and larger that are tapped from the load side of the overcurrent protective device(s) of a controlled light and power circuit shall require only short-circuit and ground-fault protection and shall be permitted to be protected by the branch-circuit overcurrent protective device(s) where the rating of the protective device(s) is not more than 300 percent of the ampacity of the Class 1 circuit conductor. [724.45(C)](https://2023.antflix.net#724.45(C)) | https://2023.antflix.net#724.45(C) |
Chapter 7 Special Conditions | 724.45(D) | Class 1 circuit conductors supplied by the secondary of a single-phase transformer having only a 2-wire (single-voltage) secondary shall be permitted to be protected by overcurrent protection provided on the primary side of the transformer if the protection is in accordance with 450.3 and does not exceed the value determined by multiplying the secondary conductor ampacity by the secondary-to-primary transformer voltage ratio. Transformer secondary conductors other than 2-wire shall not be considered to be protected by the primary overcurrent protection. [724.45(D)](https://2023.antflix.net#724.45(D)) | https://2023.antflix.net#724.45(D) |
Chapter 7 Special Conditions | 724.45(E) | Class 1 circuit conductors supplied by the output of a single-phase, listed electronic power source other than a transformer having only a 2-wire (single-voltage) output for connection to Class 1 circuits shall be permitted to be protected by overcurrent protection provided on the input side of the electronic power source if the protection does not exceed the value determined by multiplying the Class 1 circuit conductor ampacity by the output-to-input voltage ratio. Electronic power source outputs other than 2-wire (single voltage) shall not be considered to be protected by the primary overcurrent protection. [724.45(E)](https://2023.antflix.net#724.45(E)) | https://2023.antflix.net#724.45(E) |
Chapter 7 Special Conditions | 724.46 | Class 1 circuits shall be installed in accordance with 300.2 through 300.26. Exception No. 1: The requirements of 724.48 through 724.51 shall be permitted to apply in installations of Class 1 circuits. Exception No. 2: Methods permitted or required by other articles of this Code shall apply to installations of Class 1 circuits. [724.46](https://2023.antflix.net#724.46) | https://2023.antflix.net#724.46 |
Chapter 7 Special Conditions | 724.48 | Class 1 circuits shall be permitted to be installed with other circuits as specified in 724.48(A) and (B). [724.48](https://2023.antflix.net#724.48) | https://2023.antflix.net#724.48 |
Chapter 7 Special Conditions | 724.48(A) | Class 1 circuits shall be permitted to occupy the same cable, cable tray, enclosure, or raceway regardless of whether the individual circuits are alternating current or direct current if all conductors are insulated for the maximum voltage of any conductor in the cable, cable tray, enclosure, or raceway. [724.48(A)](https://2023.antflix.net#724.48(A)) | https://2023.antflix.net#724.48(A) |
Chapter 7 Special Conditions | 724.48(B) | Class 1 circuits shall be permitted to be installed with power-supply conductors as specified in 724.48(B)(1) through (B)(4). [724.48(B)](https://2023.antflix.net#724.48(B)) | https://2023.antflix.net#724.48(B) |
Chapter 7 Special Conditions | 724.48(B)(1) | Class 1 circuits and power-supply circuits shall be permitted to occupy the same cable, enclosure, or raceway without a barrier only where the equipment powered is functionally associated. Class 1 circuits shall be permitted to be installed together with the conductors of electric light, power, non-power-limited fire alarm systems, and medium-power network-powered broadband communications circuits where separated by a barrier. [724.48(B)(1)](https://2023.antflix.net#724.48(B)(1)) | https://2023.antflix.net#724.48(B)(1) |
Chapter 7 Special Conditions | 724.48(B)(2) | Class 1 circuits and power-supply circuits shall be permitted to be installed in factory- or field-assembled control centers. [724.48(B)(2)](https://2023.antflix.net#724.48(B)(2)) | https://2023.antflix.net#724.48(B)(2) |
Chapter 7 Special Conditions | 724.48(B)(3) | Class 1 circuits and power-supply circuits shall be permitted to be installed as underground conductors in manholes in accordance with one of the following: The power-supply or Class 1 circuit conductors are in metal-enclosed cable or Type UF cable.The conductors are permanently separated from power-supply conductors by continuous firmly fixed non-conductors, such as flexible tubing, in addition to insulation on the wire.The conductors are permanently and effectively separated from power-supply conductors and securely fastened to racks, insulators, or other approved supports. [724.48(B)(3)](https://2023.antflix.net#724.48(B)(3)) | https://2023.antflix.net#724.48(B)(3) |
Chapter 7 Special Conditions | 724.48(B)(4) | Installations in cable trays shall comply with the requirements of one of the following: Class 1 circuit conductors and power-supply conductors not functionally associated with the Class 1 circuit conductors shall be separated by a solid fixed barrier of a material compatible with the cable tray.Class 1 circuit conductors and power-supply conductors not functionally associated with the Class 1 circuit conductors shall be permitted to be installed in a cable tray without barriers where all of the conductors are installed with separate multiconductor Type AC, Type MC, Type MI, or Type TC cables and all the conductors in the cables are insulated at 600 volts or greater. [724.48(B)(4)](https://2023.antflix.net#724.48(B)(4)) | https://2023.antflix.net#724.48(B)(4) |
Chapter 7 Special Conditions | 724.49(A) | Conductors that are 18 AWG and 16 AWG shall be permitted to be used if they supply loads that do not exceed the ampacities specified in 402.5 and are installed in a raceway, an approved enclosure, or a listed cable. Conductors larger than 16 AWG shall not supply loads greater than the ampacities specified in 310.14. Flexible cords shall comply with the requirements of Article 400. [724.49(A)](https://2023.antflix.net#724.49(A)) | https://2023.antflix.net#724.49(A) |
Chapter 7 Special Conditions | 724.49(B) | Insulation on conductors shall be rated for the system voltage and not less than 600 volts. Conductors larger than 16 AWG shall comply with the requirements of Article 310. Conductors that are 18 AWG and 16 AWG shall be Type FFH-2, Type KF-2, Type KFF-2, Type PAF, Type PAFF, Type PF, Type PFF, Type PGF, Type PGFF, Type PTF, Type PTFF, Type RFH-2, Type RFHH-2, Type RFHH-3, Type SF-2, SFF-2, Type TF, Type TFF, Type TFFN, Type TFN, Type ZF, or Type ZFF. Conductors with other types and thicknesses of insulation shall be permitted if listed for Class 1 circuit use. [724.49(B)](https://2023.antflix.net#724.49(B)) | https://2023.antflix.net#724.49(B) |
Chapter 7 Special Conditions | 724.51(A) | Where only Class 1 circuit conductors are in a raceway, the number of conductors shall be determined in accordance with 300.17. The ampacity adjustment factors specified in 310.15(C)(1) shall apply only if such conductors carry continuous loads in excess of 10 percent of the ampacity of each conductor. [724.51(A)](https://2023.antflix.net#724.51(A)) | https://2023.antflix.net#724.51(A) |
Chapter 7 Special Conditions | 724.51(B) | Where power-supply conductors and Class 1 circuit conductors are permitted in a raceway in accordance with 724.48, the number of conductors shall be determined in accordance with 300.17. The ampacity adjustment factors specified in 310.15(C)(1) shall apply as follows: To all conductors where the Class 1 circuit conductors carry continuous loads in excess of 10 percent of the ampacity of each conductor and where the total number of conductors is more than threeTo the power-supply conductors only, where the Class 1 circuit conductors do not carry continuous loads in excess of 10 percent of the ampacity of each conductor and where the number of power-supply conductors is more than three [724.51(B)](https://2023.antflix.net#724.51(B)) | https://2023.antflix.net#724.51(B) |
Chapter 7 Special Conditions | 724.51(C) | Where Class 1 circuit conductors are installed in cable trays, they shall comply with the requirements of 392.22 and 392.80(A). [724.51(C)](https://2023.antflix.net#724.51(C)) | https://2023.antflix.net#724.51(C) |
Chapter 7 Special Conditions | 724.52 | Class 1 circuits that extend aerially beyond one building shall also meet the requirements of Part I of Article 225. [724.52](https://2023.antflix.net#724.52) | https://2023.antflix.net#724.52 |
Chapter 7 Special Conditions | 725.1 | This article covers power-limited circuits, including power-limited remote-control and signaling circuits, that are not an integral part of a device or of utilization equipment. Informational Note No. 1: The circuits described herein are characterized by usage and electrical power limitations that differentiate them from electric light and power circuits; therefore, alternative requirements are given regarding minimum wire sizes, ampacity adjustment and correction factors, overcurrent protection, insulation requirements, and wiring methods and materials. Informational Note No. 2: See 300.26 for classifications of remote-control and signaling circuits. [725.1](https://2023.antflix.net#725.1) | https://2023.antflix.net#725.1 |
Chapter 7 Special Conditions | 725.3 | In addition to the requirements of this article, circuits and equipment shall comply with the articles or sections listed in 725.3(A) through (E). Only those sections of Article 300 referenced in this article shall apply to Class 2 and Class 3 circuits. [725.3](https://2023.antflix.net#725.3) | https://2023.antflix.net#725.3 |
Chapter 7 Special Conditions | 725.3(A) | Installation of Class 2 and Class 3 circuits shall comply with 300.21. [725.3(A)](https://2023.antflix.net#725.3(A)) | https://2023.antflix.net#725.3(A) |
Chapter 7 Special Conditions | 725.3(B) | Class 2 and Class 3 circuits installed in ducts, plenums, or other space used for environmental air shall comply with 300.22. [725.3(B)](https://2023.antflix.net#725.3(B)) | https://2023.antflix.net#725.3(B) |
Chapter 7 Special Conditions | 725.3(C) | Motor control circuits tapped from the load side of the motor branch-circuit protective device(s) as specified in 430.72(A) shall comply with Part IV of Article 430. [725.3(C)](https://2023.antflix.net#725.3(C)) | https://2023.antflix.net#725.3(C) |
Chapter 7 Special Conditions | 725.3(D) | Equipment grounding conductors shall be identified in accordance with 250.119. [725.3(D)](https://2023.antflix.net#725.3(D)) | https://2023.antflix.net#725.3(D) |
Chapter 7 Special Conditions | 725.3(E) | The listing and installation of cables for Class 2 and Class 3 circuits shall comply with Part I and Part II of Article 722. [725.3(E)](https://2023.antflix.net#725.3(E)) | https://2023.antflix.net#725.3(E) |
Chapter 7 Special Conditions | 725.10 | Cables and equipment shall be permitted to be used in hazardous (classified) locations where specifically permitted by other articles in this Code. [725.10](https://2023.antflix.net#725.10) | https://2023.antflix.net#725.10 |
Chapter 7 Special Conditions | 725.21 | Access to electrical equipment shall not be denied by an accumulation of wires and cables that prevents removal of panels, including suspended ceiling panels. [725.21](https://2023.antflix.net#725.21) | https://2023.antflix.net#725.21 |
Chapter 7 Special Conditions | 725.24 | Class 2 and Class 3 equipment shall be installed in a neat and workmanlike manner. The installation shall also comply with 300.4 and 300.11. [725.24](https://2023.antflix.net#725.24) | https://2023.antflix.net#725.24 |
Chapter 7 Special Conditions | 725.30 | Class 2 and Class 3 circuits shall be identified at terminal and junction locations in a manner that prevents unintentional interference with other circuits during testing and servicing. [725.30](https://2023.antflix.net#725.30) | https://2023.antflix.net#725.30 |
Chapter 7 Special Conditions | 725.31 | Where damage to power-limited circuits can result in a failure of safety-control equipment that would introduce a direct fire or life hazard, the power-limited circuits shall be installed in accordance with 724.31. Room thermostats, water temperature regulating devices, and similar controls used in conjunction with electrically controlled household heating and air conditioning shall not be considered safety-control equipment. [725.31](https://2023.antflix.net#725.31) | https://2023.antflix.net#725.31 |
Chapter 7 Special Conditions | 725.60(A) | The power source for a Class 2 or a Class 3 circuit shall be as follows: Informational Note No. 1: Informational Note Figure 725.60 illustrates the relationships between Class 2 or Class 3 power sources, their supply, and the Class 2 or Class 3 circuits.Informational Note No. 2: See Chapter 9, Table 11(A) and Table 11(B), for requirements for listed Class 2 and Class 3 power sources. Informational Note Figure 725.60 Class 2 and Class 3 Circuits. A listed Class 2 or Class 3 transformerA listed Class 2 or Class 3 power supplyOther listed equipment marked to identify the Class 2 or Class 3 power sourceException No. 1 to (3): Thermocouples shall not require listing as a Class 2 power source.Exception No. 2 to (3): Limited power circuits of listed equipment where these circuits have energy levels rated at or below the limits established in Chapter 9, Table 11(A) and Table 11(B).Informational Note No. 3: Examples of other listed equipment are as follows:A circuit card listed for use as a Class 2 or Class 3 power source where used as part of a listed assemblyA current-limiting impedance, listed for the purpose, or part of a listed product, used in conjunction with a non-power-limited transformer or a stored energy source, for example, storage battery, to limit the output currentA thermocoupleLimited voltage/current or limited impedance secondary communications circuits of listed industrial control equipmentListed audio/video, information technology (computer), communications, and industrial equipment limited-power circuitsInformational Note No. 4: One way to determine applicable requirements for listing of information technology (computer) equipment is to refer to UL 60950-1-2011, Standard for Safely of Information Technology Equipment. Another way to determine applicable requirements for listing of audio/video, information technology, and communications equipment is to refer to UL 62368-1-2014, Safety of audio/video, information and communication technology equipment. Typically such circuits are used to interconnect data circuits for the purpose of exchanging information data. One way to determine applicable requirements for listing of industrial equipment is to refer to UL 61010-2-201, Safety requirements for electrical equipment for measurement, control, and laboratory use - Part 2-201: Particular requirements for control equipment, and/or UL 61800-5-1, Adjustable speed electrical power drive systems - Part 5-1: Safety requirements - Electrical, thermal and energy.A battery source or battery source system that is listed and identified as Class 2 [725.60(A)](https://2023.antflix.net#725.60(A)) | https://2023.antflix.net#725.60(A) |
Chapter 7 Special Conditions | 725.60(B) | Class 2 or Class 3 power sources shall not have the output connections paralleled or otherwise interconnected unless listed for such interconnection. [725.60(B)](https://2023.antflix.net#725.60(B)) | https://2023.antflix.net#725.60(B) |
Chapter 7 Special Conditions | 725.60(C) | The equipment supplying the circuits shall be durably marked where plainly visible to indicate each circuit that is a Class 2 or Class 3 circuit. The power sources for limited power circuits in 725.60(A)(3), limited power circuits for listed audio/video equipment, listed information technology equipment, listed communications equipment, and listed industrial equipment in 725.60(A)(4) shall have a label indicating the maximum voltage and rated current output per conductor for each connection point on the power source. Where multiple connection points have the same rating, a single label shall be permitted to be used. Informational Note No. 1: Rated current for power sources covered in 725.144 is the output current per conductor the power source is designed to deliver to an operational load at normal operating conditions, as declared by the manufacturer. Informational Note No. 2: An example of a label is "52V @ 0.433A, 57V MAX" for an IEEE 802.3 compliant Class 8 power source. [725.60(C)](https://2023.antflix.net#725.60(C)) | https://2023.antflix.net#725.60(C) |
Chapter 7 Special Conditions | 725.127 | Conductors and equipment on the supply side of the power source shall be installed in accordance with the appropriate requirements of Chapters 1 through 4. Exception: The input leads of a transformer or other power source supplying Class 2 and Class 3 circuits shall be permitted to be smaller than 14 AWG but not smaller than 18 AWG if they are protected by an overcurrent device rated not over 20 amperes, are not over 305 mm (12 in.) long, and have insulation that complies with 724.49(B). [725.127](https://2023.antflix.net#725.127) | https://2023.antflix.net#725.127 |
Chapter 7 Special Conditions | 725.130 | Class 2 and Class 3 circuits on the load side of the power source shall be permitted to be installed using wiring methods and materials in accordance with 725.130(A), (B), or a combination of both. Parts I and II of Article 722 shall apply. [725.130](https://2023.antflix.net#725.130) | https://2023.antflix.net#725.130 |
Chapter 7 Special Conditions | 725.130(A) | Use of Class 1 wiring methods for Class 2 and Class 3 circuits shall be permitted. Separation from electric light, power, Class 1, non-power-limited fire alarm circuit conductors, and medium-power network-powered broadband communications cables shall comply with 725.136. Exception: The ampacity adjustment factors given in 310.15(C)(1) shall not apply. [725.130(A)](https://2023.antflix.net#725.130(A)) | https://2023.antflix.net#725.130(A) |
Chapter 7 Special Conditions | 725.130(B) | Conductors on the load side of the power source shall be insulated in accordance with 722.179 and be installed in accordance with 722.135 and 725.136 through 725.144. Exception No. 1: As provided for in 620.21 for elevators and similar equipment. Exception No. 2: Other wiring methods and materials installed in accordance with 725.3 shall be permitted to extend or replace the conductors and cables described in 722.179(A) and permitted by 725.130(B). Exception No. 3: Bare Class 2 conductors shall be permitted as part of a listed intrusion protection system where installed in accordance with the listing instructions for the system. [725.130(B)](https://2023.antflix.net#725.130(B)) | https://2023.antflix.net#725.130(B) |
Chapter 7 Special Conditions | 725.136(A) | Cables and conductors of Class 2 and Class 3 circuits shall not be placed in any cable, cable tray, compartment, enclosure, manhole, outlet box, device box, raceway, or similar fitting with conductors of electric light, power, Class 1, non—power-limited fire alarm circuits, and medium-power network-powered broadband communications circuits unless permitted by 725.136(B) through (I). [725.136(A)](https://2023.antflix.net#725.136(A)) | https://2023.antflix.net#725.136(A) |
Chapter 7 Special Conditions | 725.136(B) | Class 2 and Class 3 circuits shall be permitted to be installed together with the conductors of electric light, power, Class 1, non—power-limited fire alarm, and medium-power network-powered broadband communications circuits where they are separated by a barrier. [725.136(B)](https://2023.antflix.net#725.136(B)) | https://2023.antflix.net#725.136(B) |
Chapter 7 Special Conditions | 725.136(C) | In enclosures, Class 2 and Class 3 circuits shall be permitted to be installed in a raceway to separate them from Class 1, non—power-limited fire alarm, and medium-power network-powered broadband communications circuits. [725.136(C)](https://2023.antflix.net#725.136(C)) | https://2023.antflix.net#725.136(C) |
Chapter 7 Special Conditions | 725.136(D) | Class 2 and Class 3 circuit conductors in compartments, enclosures, device boxes, outlet boxes, or similar fittings shall be permitted to be installed with electric light, power, Class 1, non—power-limited fire alarm, and medium-power network-powered broadband communications circuits where they are introduced solely to connect the equipment connected to Class 2 and Class 3 circuits, and where one of the following applies: The electric light, power, Class 1, non—power-limited fire alarm, and medium-power network-powered broadband communications circuit conductors are routed to maintain a minimum of 6 mm (0.25 in.) separation from the conductors and cables of Class 2 and Class 3 circuits.The circuit conductors operate at 150 volts or less to ground and comply with one of the following:The Class 2 and Class 3 circuits are installed using Type CL3, Type CL3R, or Type CL3P or permitted substitute cables if these Class 3 cable conductors extending beyond the jacket are separated by a minimum of 6 mm (0.25 in.) or by a nonconductive sleeve or nonconductive barrier from all other conductors.The Class 2 and Class 3 circuit conductors are installed as a Class 1 circuit in accordance with 724.40. [725.136(D)](https://2023.antflix.net#725.136(D)) | https://2023.antflix.net#725.136(D) |
Chapter 7 Special Conditions | 725.136(E) | Class 2 and Class 3 circuit conductors entering compartments, enclosures, device boxes, outlet boxes, or similar fittings shall be permitted to be installed with Class 1, non—power-limited fire alarm, and medium-power network-powered broadband communications circuits where they are introduced solely to connect the equipment connected to Class 2 and Class 3 circuits. Where Class 2 and Class 3 circuit conductors must enter an enclosure that is provided with a single opening, they shall be permitted to enter through a single fitting (such as a tee) if the conductors are separated from the conductors of the other circuits by a continuous and firmly fixed nonconductor, such as flexible tubing. [725.136(E)](https://2023.antflix.net#725.136(E)) | https://2023.antflix.net#725.136(E) |
Chapter 7 Special Conditions | 725.136(F) | Underground Class 2 and Class 3 circuit conductors in a manhole shall be permitted to be installed with Class 1, non—power-limited fire alarm, and medium-power network-powered broadband communications circuits where one of the following conditions is met: The electric light, power, Class 1, non—power-limited fire alarm, and medium-power network-powered broadband communications circuit conductors are in a metal-enclosed cable or Type UF cable.The Class 2 and Class 3 circuit conductors are permanently and effectively separated from the conductors of other circuits by a continuous and firmly fixed nonconductor, such as flexible tubing, in addition to the insulation or covering on the wire.The Class 2 and Class 3 circuit conductors are permanently and effectively separated from conductors of the other circuits and securely fastened to racks, insulators, or other approved supports. [725.136(F)](https://2023.antflix.net#725.136(F)) | https://2023.antflix.net#725.136(F) |
Chapter 7 Special Conditions | 725.136(G) | Class 2 and Class 3 circuit conductors shall be permitted to be installed in cable trays where the conductors of the electric light, Class 1, and non—power-limited fire alarm circuits are separated by a solid fixed barrier of a material compatible with the cable tray or where the Class 2 or Class 3 circuits are installed in Type MC cable. [725.136(G)](https://2023.antflix.net#725.136(G)) | https://2023.antflix.net#725.136(G) |
Chapter 7 Special Conditions | 725.136(H) | Class 2 and Class 3 circuits shall be permitted to be installed together with the conductors of electric light, power, Class 1, non—power-limited fire alarm, and medium-power network-powered broadband communications circuits where they are installed using Class 1 wiring methods in accordance with 724.46 and where they are protected by an approved raceway. [725.136(H)](https://2023.antflix.net#725.136(H)) | https://2023.antflix.net#725.136(H) |
Chapter 7 Special Conditions | 725.136(I) | For other applications, conductors of Class 2 and Class 3 circuits shall be separated by at least 50 mm (2 in.) from conductors of any electric light, power, Class 1, non—power-limited fire alarm, or medium-power network-powered broadband communications circuits unless one of the following conditions is met: Either all of the electric light, power, Class 1, non—power-limited fire alarm, and medium-power network-powered broadband communications circuit conductors or all of the Class 2 and Class 3 circuit conductors are in a raceway or in metal-sheathed, metal-clad, nonmetallic-sheathed, Type TC, or Type UF cables.All of the electric light, power, Class 1, non—power-limited fire alarm, and medium-power network-powered broadband communications circuit conductors are permanently separated from all of the Class 2 and Class 3 circuit conductors by a continuous and firmly fixed nonconductor, such as porcelain tubes or flexible tubing, in addition to the insulation on the conductors. [725.136(I)](https://2023.antflix.net#725.136(I)) | https://2023.antflix.net#725.136(I) |
Chapter 7 Special Conditions | 725.139(A) | Conductors of two or more Class 2 circuits shall be permitted within the same cable, enclosure, raceway, or cable routing assembly. [725.139(A)](https://2023.antflix.net#725.139(A)) | https://2023.antflix.net#725.139(A) |
Chapter 7 Special Conditions | 725.139(B) | Conductors of two or more Class 3 circuits shall be permitted within the same cable, enclosure, raceway, or cable routing assembly. [725.139(B)](https://2023.antflix.net#725.139(B)) | https://2023.antflix.net#725.139(B) |
Chapter 7 Special Conditions | 725.139(C) | Conductors of one or more Class 2 circuits shall be permitted within the same cable, enclosure, raceway, or cable routing assembly with conductors of Class 3 circuits if the insulation of the Class 2 circuit conductors in the cable, enclosure, raceway, or cable routing assembly is at least that required for Class 3 circuits. [725.139(C)](https://2023.antflix.net#725.139(C)) | https://2023.antflix.net#725.139(C) |
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