Percent of cross section of conduit and tubing for conductors and cables.
Municipal Code of Chicago § 14E-9-001
in effect14E-9-001 Percent of cross section of conduit and tubing for conductors and cables.
Chapter 9, Table 1 of NFPA 70 is adopted by reference with the following modification:
1. Revise Note 1 to read:
"See Informative Annex C for the maximum number of selected carrying-conductors (Types THHN, THWN, and THWN-2 only), all of the same size (total cross-sectional area including insulation) permitted in trade sizes of the applicable conduit or tubing."
2. Revise Note 10 to read:
"(10) Informative Annex C includes conductor types THHN, THWN and THWN-2 only. All other conductor types shall use Tables 5 and 5A for dimensions of conductors and Table 4 for the applicable conduit or tubing capacity. Solid and round concentric-lay-stranded conductor values are grouped together for the purpose of Table 5. Round compact-stranded conductor values are shown in Table 5A. If the actual values of the conductor diameter and area are known, they shall be permitted to be used."
(Amend Coun. J. 4-10-19, p. 100029, Art. VI, § 9)
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2672332Fetched: 10/24/2026