An existing ceiling raceway system has 115,000 sq mm (177 sq in) of cross-sectional area available for distribution of cable runs. How many can be served by the existing system?

115 incorrectly applies the metric value (115,000) divided by 1,000, which is not the BICSI-defined calculation method for ceiling raceway capacity.

160 does not result from any standard calculation method applied to the given cross-sectional area of 177 sq in or 115,000 sq mm.

Per BICSI TDMM, a ceiling distribution raceway provides one work area outlet position per square inch of usable cross-sectional area. With 177 sq in (115,000 sq mm) available, the system supports exactly 177 work areas, directly matching answer C.

189 overstates capacity and cannot be derived from the correct BICSI formula of 1 sq in per cable position applied to 177 sq in.

195 exceeds the physically available area and is not produced by any recognized BICSI calculation for ceiling raceway distribution capacity.