Chicago Electrical Code (CEC)

Section 300.11 states:> "Conductors and equipment shall be securely fastened to ceilings and walls. Exception: Where raceways or other approved means of support are provided."Section 300.22 states:> "In commercial, industrial, institutional, and multifamily dwellings (other than one- and two-family dwellings):> (A) Conductors shall be installed in raceways, except as permitted in (B).> (B) As provided in this section, conductors shall be permitted to be installed without raceways in accessible attics and in unfinished basements."Interpretation

Based on the above sections, low voltage wire (such as for security systems, intercoms, etc.) installed in ceilings in Chicago is required to be installed in conduit or another approved means of support. This is because it is not considered to be in an accessible attic or unfinished basement.

Exceptions:

There may be some exceptions to this rule, such as: Where the ceiling is a suspended ceiling and the wires are attached to the ceiling grid. Where the wires are run through existing conduit or other approved raceways.However, it is always best to consult with a qualified electrician or the local building department for specific guidance on your project. Flag for review