Install fire barriers within the tray to isolate different fire zones. When cable trays pass through walls or floors, seal openings using fire-rated penetration sealing materials. Implementing. FireResistant Solutions provides cable tray covering and fire-protection systems designed to safeguard electrical and data infrastructure in commercial and multifamily buildings. These systems prevent fire and smoke from spreading through open cable pathways, maintaining circuit integrity and code. Cable trays hold the wires for things like power and communication. They seem like separate things, but they need each other to keep buildings safe.