When running alarm wires or power wires through barriers intended to stop the spread of fire or smoke, what should you do?

• A. Properly use fire caulk
• B. Install the wires without barrier treatment
• C. Seal with standard caulk
• D. Use ordinary tape to seal gaps

Answer: (A)

Wires passing through fire-rated barriers must be firestopped to preserve the barrier’s ability to resist flames and smoke. Fire-rated walls and ceilings are designed to slow the spread of fire, but any gap around penetrations can become a path for heat and smoke. Using a listed firestop material, such as fire caulk, seals around the cables and fills the voids so the barrier retains its rating. Fire caulk is formulated to withstand high temperatures and prevents smoke and flame from bypassing the barrier, whereas standard caulk, ordinary tape, or unsealed gaps do not provide the necessary fire resistance. Following the manufacturer’s instructions and applicable code requirements ensures the installation remains compliant and effective in delaying fire spread.