When designing for horizontal pathways in an environment that requires fire-stopping for penetrating a rated wall, what is the MAXIMUM till ratio for telecommunications cabling in a cable tray?

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When designing for horizontal pathways in an environment that requires fire-stopping for penetrating a rated wall, what is the MAXIMUM till ratio for telecommunications cabling in a cable tray?
A . 20 percent
B . 40 percent
C . 50 percent
D . There is no fill ratio for cable tray

Answer: B