Cable trays in fire equipment rooms are fixed using fire-resistant supports, brackets, and fasteners, often combined with firestopping materials to ensure stability and safety.

Mechanical Supports and Fasteners

Cable trays are typically mounted using steel or galvanized brackets, hangers, and supports that are securely anchored to walls, ceilings, or structural beams. These supports must ensure that the trays are level, plumb, and capable of bearing the full weight of the cables without deformation or failure under load. Bolts, screws, and splice plates are commonly used to connect tray sections and secure them to the supports, maintaining alignment and mechanical integrity .

Fire-Resistant Materials

In fire equipment rooms, cable trays are often made of steel with fire-resistant coatings, stainless steel, or other fireproof materials to prevent flame propagation and protect the cables during a fire . For additional fire protection, firestop packs, fire-rated boards, firestop mastic, or mineral wool may be used around tray penetrations through walls or floors to seal gaps and maintain fire compartmentation .

Firestopping and Sealing

When cable trays pass through walls, floors, or slabs, openings must be tightly sealed with firestopping materials. This includes installing fire-resistant backing plates for large openings and ensuring that gaps around cables do not exceed recommended dimensions. Cover plates are used to close openings neatly, providing both fire protection and a clean installation .

Additional Considerations

• Grounding: Metal trays must be properly grounded to safely conduct stray electricity and prevent shock hazards .
• Inspection and Maintenance: Periodic checks are required to ensure tray connections remain firm, coatings are intact, and firestopping materials are effective .
• Tray Type Selection: Indoor trays are usually painted steel or galvanized, while outdoor or high-humidity areas may require stainless steel or aluminum alloy trays . By combining mechanical supports, fire-resistant materials, and proper firestopping, cable trays in fire equipment rooms remain secure, functional, and compliant with safety standards.