Class 1, class 2, and class 3 remote-control, signaling, and power-limited circuits.
Municipal Code of Chicago § 14E-7-725
in effect14E-7-725 Class 1, class 2, and class 3 remote-control, signaling, and power-limited circuits.
The provisions of Article 725 of NFPA 70 are adopted by reference with the following modifications:
1. Revise section 725.3 to read:
"725.3 Other Articles. Circuits and equipment shall comply with the articles or sections listed in 725.3(A) through (N). Only those sections of Article 300 referenced in this article shall apply to Class 1, Class 2, and Class 3 circuits.
(A) Number and Size of Conductors in Raceway. Installations shall comply with 300.17.
(B) Spread of Fire or Products of Combustion. Installation of Class 1, Class 2, and Class 3 circuits shall comply with 300.21.
(C) Ducts, Plenums, and Other Air-Handling Spaces. Class 1, Class 2, and Class 3 circuits installed in ducts, plenums, or other space used for environmental air shall comply with 300.22.
(D) Hazardous (Classified) Locations. Articles 500 through 516 and Article 517, Part IV, where installed in hazardous (classified) locations.
(E) Cable Trays. Article 392, where installed in cable tray.
(F) Motor Control Circuits. Article 430, Part VI, where tapped from the load side of the motor branch- circuit protective device(s) as specified in 430.72(A).
(G) Instrumentation Tray Cable. See Article 727.
(H) Raceways Exposed to Different Temperatures. Installations shall comply with 300.7(A).
(I) Vertical Support for Fire-Rated Cables and Conductors. Vertical installations of circuit integrity (CI) cables and conductors installed in a raceway or conductors and cables of electrical circuit protective systems shall be installed in accordance with 300.19.
(J) Bushing. A bushing shall be installed where cables emerge from raceway used for mechanical support or protection in accordance with 300.15(C).
(K) Installation of Conductors with Other Systems. Installations shall comply with 300.8.
(L) Corrosive, Damp, or Wet Locations. Class 2 and Class 3 cables installed in corrosive, damp, or wet locations shall comply with the applicable requirements in 110.11, 300.5(B), 300.6, 300.9, and 310.10(G).
(M) Cable Routing Assemblies. Class 2, Class 3, and Type PLTC cables shall be permitted to be installed in riser cable routing assemblies, and general-purpose cable routing assemblies selected in accordance with Table 800.154(C), listed in accordance with the provisions of 800.182, and installed in accordance with 800.110(C) and 800.113.
(N) Communications Raceways. Class 2, Class 3, and Type PLTC cables shall be permitted to be installed in plenum communications raceways, riser communications raceways, and general-purpose communications raceways selected in accordance with the provisions of Table 800.154(b), listed in accordance with 800.182, and installed in accordance with 800.113."
2. Revise subsection 725.135(B) and (C) to read:
"(B) Ducts Specifically Fabricated for Environmental Air. Wires and cables installed in ducts specifically fabricated for environmental air shall be installed in accordance with 300.22(B).
(C) Other Spaces Used for Environmental Air (Plenums). Wires and cables installed in other spaces used for environmental air (plenums) shall be installed in accordance with 300.22(C)."
3. Revise the first paragraph of section 725.144 to read:
"The requirements of 725.144(A) and (B) shall apply to Class 2 and Class 3 circuits that transmit power and data to a powered device. The requirements of Parts I and III of Article 725, 300.11, and 300.22 shall apply to Class 2 and Class 3 circuits that transmit power and data. The conductors that carry power for the data circuits shall be copper. The current in the power circuit shall not exceed the current limitation of the connectors."
4. Revise Table 725.154 to read:
"Applications of Listed Class 2, Class 3, CMUC, and PLTC Cables in Buildings
Applications | Wire and Cable Type
CL2P & CL3P | CL2R & CL3R | CL2 & CL3 | CL2X & CL3X | CMUC | PLTC
Applications | Wire and Cable Type
CL2P & CL3P | CL2R & CL3R | CL2 & CL3 | CL2X & CL3X | CMUC | PLTC
In fabricated ducts as described in 300.22(B) | In fabricated ducts | N | 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 as described in 300.22(C) | In other spaces used for environmental air | N | N | N | N | N | N
In metal raceway that complies with 300.22(C) | Y* | Y* | Y* | Y* | N | Y*
In risers | In vertical runs | Y* | Y* | N | N | N | N
In metal raceways | Y* | Y* | Y* | Y* | N | Y*
In fireproof shafts | Y* | Y* | Y* | Y* | N | Y*
In plenum communications raceways | Y* | Y* | N | N | N | N
In riser communications raceways | Y* | Y* | N | N | N | N
In riser cable routing assemblies | Y* | Y* | N | N | N | N
In one- and two-family dwellings | Y* | Y* | Y* | Y* | N | Y*
Within buildings in other than air-handling spaces and risers | General | Y* | Y* | Y* | Y* | N | Y*
In one- and two-family dwellings | Y* | Y* | Y* | Y* | Y* | Y*
In multifamily dwellings | Y* | Y* | Y* | Y* | Y* | Y*
In non-concealed spaces | Y* | Y* | Y* | Y* | Y* | Y*
Supported by cable trays | Y* | Y* | Y* | N | N | Y*
Under carpet | N | N | N | N | Y* | N
In cross-connect arrays | Y* | Y* | Y* | N | N | Y*
In any raceway recognized in Chapter 3 | Y* | Y* | Y* | Y* | N | Y*
In plenum communications raceways | Y* | Y* | Y* | N | N | Y*
In riser communications raceways | Y* | Y* | Y* | N | N | Y*
In riser cable routing assemblies | Y* | Y* | Y* | N | N | Y*
In general-purpose communications raceways | Y* | Y* | Y* | N | N | Y*
In general-purpose cable routing assemblies | Y* | Y* | Y* | N | N | Y*
Note: ‘N" indicates that the cable type shall not be permitted to be installed in the application.
"Y" indicates that the cable type shall be permitted to be installed in the application, subject to the limitations described in 725.130 through 725.143."
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2671761Fetched: 10/24/2026