Fireproofing and sealing material content of cable trays

Fireproofing and sealing of cable trays typically use fire-rated boards, firestop packs, firestop mastic, mineral wool, and specialized fire-resistant coatings.

Fire-Resistant Coatings

Cable trays are often coated with intumescent or fire-resistant coatings such as FLAMMOTECT-A or DG-CR 0.7, which form a protective shield around cables to prevent flame propagation and maintain functionality during a fire. These coatings also enhance resistance to environmental factors like UV radiation, moisture, oil, and chemicals, making them suitable for both indoor and outdoor applications . Application methods include spraying, rolling, or brushing, with careful control of thickness to meet fire-resistance standards .

Firestop Materials

For sealing cable trays, especially at wall or floor penetrations, firestop packs, firestop mastic, and fire-resistant mineral wool are commonly used. Firestop packs are placed in an orderly sequence, ensuring gaps between cables and packs do not exceed 1 cm², with a minimum packing thickness of 24 cm. Firestop mastic is applied to seal gaps and ensure airtight, fire-resistant closures, while mineral wool provides thermal insulation and flame resistance .

Tray Construction Materials

The choice of tray material also contributes to fire safety:

• Indoor trays: Painted steel or galvanized steel
• Outdoor trays: Hot-dip galvanized steel or stainless steel
• Corrosive/high-humidity environments: Aluminum alloy or fiberglass-reinforced plastic (FRP) trays These materials are selected for their mechanical strength, corrosion resistance, and ability to withstand high temperatures without deforming.

Additional Fireproofing Measures

• Cover plates and backing plates are used to close openings and reinforce firestopping at penetrations .
• Primers and topcoats with anti-corrosion and weather-resistant properties improve durability and maintain fire-resistance over time .
• Perforated or mesh trays can enhance heat dissipation, reducing the risk of overheating and fire spread .

Summary

Effective fireproofing and sealing of cable trays combine specialized coatings, firestop materials, and robust tray construction. Using these materials ensures compliance with safety standards, prevents fire propagation, and maintains cable functionality in critical infrastructure, industrial, and commercial environments .