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CLASS 2 REMOTE-CONTROL, SIGNALING AND POWER-LIMITED CIRCUITS

E4303.2.2 Type CL2 cables. Cables for general-purpose operate at 150 volts or less to ground and the Class 2
use, shall be listed as resistant to the spread of fire and circuits are installed using Types CL3, CL3R, or
listed for the use. [725.179 (C)] CL3P or permitted substitute cables, and provided
E4303.2.3 Type CL2X cables. Type CL2X limited-use that these Class 3 cable conductors extending beyond
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cable shall be listed as suitable for use in dwellings and their jacket are separated by a minimum of / inch
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raceways and shall be listed as resistant to flame spread. (6.4 mm) or by a nonconductive sleeve or nonconduc-
[725.179 (D)] tive barrier from all other conductors. [725.136(D)]
E4303.2.4 Type CL2R cables. Cables installed in a verti- E4304.2 Other applications. Conductors of Class 2 circuits
cal run in a shaft or installed from floor to floor shall be shall be separated by not less than 2 inches (51 mm) from
listed as suitable for use in a vertical run in a shaft or from conductors of any electric light, power, Class 1 or nonpower-
floor to floor and shall be listed as having fire-resistant limited fire alarm circuits except where one of the following
characteristics capable of preventing fire from being con- conditions is met:
veyed from floor to floor. [725.179(B)] 1. All of the electric light, power, Class 1 and nonpower-
Exception: CL2X and CL3X cables with a diameter of limited fire alarm circuit conductors are in raceways or
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less than / inch (6.4 mm) and CL2P, CL3P, CL3R, in metal-sheathed, metal-clad, nonmetallic-sheathed or
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CL2 and CL3 cables shall be permitted in risers in one- Type UF cables.
and two-family dwelling units. [725.133 (G)] 2. All of the Class 2 circuit conductors are in raceways or
E4303.2.5 Marking. Cables shall be marked in accor- in metal-sheathed, metal-clad, nonmetallic-sheathed or
dance with Table E4303.2.5. Voltage ratings shall not be Type UF cables. [725.136(I)]
marked on cables. E4304.3 Class 2 circuits with communications circuits.
Table E4303.2.5 [Table 725.179(J)] Where Class 2 circuit conductors are in the same cable as
CABLE MARKING communications circuits, the Class 2 circuits shall be classi-
CABLE MARKING TYPE fied as communications circuits and shall meet the require-
ments of Article 800 of NFPA 70. The cables shall be listed

CL2P Class 2 plenum cable
as communications cables or multipurpose cables.
CL2R Class 2 riser cable
Cables constructed of individually listed Class 2 and com-
CL2 Class 2 cable munications cables under a common jacket shall be permitted
CL2X Class 2 cable, limited use to be classified as communications cables. The fire-resistance
rating of the composite cable shall be determined by the per-
formance of the composite cable. [725.139 (D)(1)]
SECTION E4304 E4304.4 Class 2 cables with other circuit cables. Jacketed
INSTALLATION REQUIREMENTS cables of Class 2 circuits shall be permitted in the same enclo-
E4304.1 Separation from other conductors. In cables, com- sure or raceway with jacketed cables of any of the following:
partments, enclosures, outlet boxes, device boxes, and race- 1. Power-limited fire alarm systems in compliance with
ways, conductors of Class 2 circuits shall not be placed in any Article 760 of NFPA 70.
cable, compartment, enclosure, outlet box, device box, race-
way, or similar fitting with conductors of electric light, power, 2. Nonconductive and conductive optical fiber cables in
Class 1 and nonpower-limited fire alarm circuits. (725.136) compliance with Article 770 of NFPA 70.
Exceptions: 3. Communications circuits in compliance with Article
800 of NFPA 70.
1. Where the conductors of the electric light, power,
Class 1 and nonpower-limited fire alarm circuits are 4. Community antenna television and radio distribution
separated by a barrier from the Class 2 circuits. In systems in compliance with Article 820 of NFPA 70.
enclosures, Class 2 circuits shall be permitted to be 5. Low-power, network-powered broadband communica-
installed in a raceway within the enclosure to sepa- tions in compliance with Article 830 of NFPA 70.
rate them from Class 1, electric light, power and [725.139(E)]
nonpower-limited fire alarm circuits. [725.136(B)] E4304.5 Installation of conductors and cables. Cables and
2. Class 2 conductors in compartments, enclosures, conductors installed exposed on the surface of ceilings and
device boxes, outlet boxes and similar fittings where sidewalls shall be supported by the building structure in such
electric light, power, Class 1 or nonpower-limited fire a manner that they will not be damaged by normal building
alarm circuit conductors are introduced solely to con- use. Such cables shall be supported by straps, staples, hangers,
nect to the equipment connected to the Class 2 cir- cable ties or similar fittings designed so as to not damage the
cuits. The electric light, power, Class 1 and cable. Nonmetallic cable ties and other nonmetallic accesso-
nonpower-limited fire alarm circuit conductors shall ries used to secure and support cables located in stud cavity
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be routed to maintain a minimum of / inch (6.4 mm) and joist space plenums shall be listed as having low smoke
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separation from the conductors and cables of the and heat release properties. The installation shall comply with
Class 2 circuits; or the electric light power, Class 1 Table E3802.1 regarding cables run parallel with framing
and nonpower-limited fire alarm circuit conductors members and furring strips. The installation of wires and

780 2018 INTERNATIONAL RESIDENTIAL CODE ®
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