In a fire-rated floor-ceiling cavity, wiring shall not be supported by which items?

• A. True
• B. False
• C. Sometimes
• D. Not specified

Answer: (A)

Wiring inside a fire-rated floor–ceiling cavity must be supported only by listed electrical supports attached to the structural framing. It should not be supported by components such as ductwork, piping, or suspended ceiling elements within the cavity, because these non-structural items aren’t guaranteed to maintain the fire rating and can deform, burn, or fail in a fire, creating paths for heat, smoke, or structural compromise. Use proper clamps, staples, or straps rated for fire-rated assemblies and ensure any penetrations through the fire barrier are firestopped with listed methods. So, the statement that wiring shall not be supported by those items is correct.