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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?
I think this question is based off Figure 18.4, Page 18-16 or 1463. It doesn't give enough information to answer correctly though. 177 would be a guess.
BICSI provides guidelines on the maximum number of cable runs that can be installed in a raceway system based on its cross-sectional area. According to BICSI, the maximum number of cable runs in a raceway system can be calculated as follows:
Maximum number of cable runs = Cross-sectional area × (Fill ratio) ÷ Cable area
For a typical Category 5e UTP (unshielded twisted pair) cable, the cable area is approximately 32 sq mm (0.05 sq in).
Number of cable runs = 115,000 sq mm × (40%) ÷ 32 sq mm = 1,437.5
Now assuming 3 cables per work area (people it can serve)
479 = 1437.5 ÷ 3
Therefore, none of the options (A to E) are correct.
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