Fireproof board installed on cable trays

Adding fireproof boards to cable trays significantly enhances fire protection, thermal insulation, and structural stability, ensuring cables remain functional during fire events.

Purpose and Benefits

Fireproof boards are used to encapsulate or line cable trays, forming a protective barrier that prevents fire from spreading along cable runs. They provide several key benefits:

• Exceptional Fire Resistance: High-density calcium silicate boards and other fireproof materials are non-combustible and can protect cables for 1–2 hours or more, maintaining cable functionality during a fire .
• Thermal Insulation: These boards have low thermal conductivity, reducing heat transfer to cables and preventing insulation failure .
• Structural Stability: Fireproof boards retain their shape and strength under high temperatures, ensuring the enclosure continues to protect cables mechanically .
• Environmental Protection: Some fireproof coatings and tapes also shield cables from UV, moisture, chemicals, and saltwater, extending cable lifespan .

Types of Fireproof Boards and Systems

1. High-Density Calcium Silicate Boards: Used to construct box structures or as encapsulation layers around existing trays. They are classified as Class A non-combustible materials .
2. Fire-Resistant Boards in Cable Trays: Typically 5–12 mm thick, these boards form the core protective layer in specialized fire-resistant cable trays, providing up to 60 minutes of fire resistance .
3. Intumescent Fire-Blocking Sections: Lightweight, compact systems that expand under high temperatures to fill cavities, creating a secondary fire barrier. They allow easy addition or removal of cables without damaging the tray .
4. Fire Protection Coatings and Tapes: Products like FLAMMOTECT-A and DG-CR 0.7 form a protective shield around cables and trays, preventing flame propagation and enhancing environmental resistance .

Installation Considerations

• Fireproof boards can be directly applied to existing cable trays or used in prefabricated fire-resistant trays .
• Intumescent sections and fireproof coatings are suitable for both new installations and retrofits, allowing flexibility in maintenance and upgrades .
• Proper installation ensures continuous fire barriers, especially at tray joints, bends, and penetrations through walls or floors .

Applications

Fireproof boards in cable trays are widely used in industrial plants, high-rise buildings, hospitals, airports, power stations, and nuclear facilities, where maintaining cable functionality during fire is critical . They are suitable for both indoor and outdoor environments and can be adapted to curved or arc-shaped trays for aesthetic and functional purposes . Adding fireproof boards to cable trays is a proven method to enhance fire safety, protect critical infrastructure, and comply with fire protection standards, ensuring reliable operation of power and communication systems during emergencies.