Fire protection requirements for trough-type cable trays

Trough-type cable trays can be effectively protected from fire using fire-resistant materials, coatings, and proper firestopping techniques to ensure cable functionality and safety in critical installations.

Fire-

Resistant Trough Cable TraysTrough-type cable trays are fully enclosed, providing directional protection and shielding for sensitive cables such as communication, computer, and thermocouple lines. Their enclosed design enhances flame retardancy, prevents dust and moisture ingress, and offers mechanical and electromagnetic protection. These trays are suitable for high-risk environments like chemical plants, high-rise buildings, tunnels, subways, and electronic factories due to their structural stability, long-span capability, and corrosion resistance (galvcabletray.com).

Material Selection

The fire resistance and durability of trough-type trays depend on the material composition: Galvanized steel: General indoor useStainless steel: Corrosive or chemical environmentsFiberglass-reinforced plastic (FRP): High chemical resistance and lightweight applications Always verify that the tray meets local and international fire codes and request certified test reports such as UL, CE, or national fire ratings to ensure compliance (accio.com).

Fireproofing Coatings and Tapes

Fire protection can be enhanced with specialized coatings and tapes: FLAMMOTECT-A coating: Forms a protective shield around cables, preventing flame propagationDG-CR 0. 7 fire protection tape: Provides additional fire resistance and environmental protection against UV, moisture, and chemicals These solutions ensure that cables remain operational during a fire, supporting reliable power and communication in critical facilities like hospitals, airports, and power plants (flamro.com).

Firestopping Techniques

When cable trays pass through walls, slabs, or shafts, proper firestopping is essential: Seal openings with fire-rated boards, firestop packs, firestop mastic, or mineral woolEnsure gaps around cables are minimal (≤1 cm²) and packing thickness is sufficient (≥24 cm)Install fire-resistant backing plates for large openingsCover plates should be square, consistent, and painted to maintain integrity and aesthetics This prevents fire and smoke from spreading through penetrations while maintaining cable functionality (allpcb.com).

Installation Considerations

Maintain horizontal deviation ≤2 mm/m and vertical deviation ≤3 mm/mEnsure trays are level, plumb, and securely mountedSegregate power and signal cables to reduce interferenceSelect tray width and thickness based on cable weight and quantity to prevent deformation (zeroinstrument.com) SummaryEffective fire protection for trough-type cable trays combines material selection, fireproof coatings, firestopping, and precise installation. By choosing the right tray material, applying fire-resistant coatings or tapes, and sealing penetrations properly, you can ensure cable integrity, operational reliability, and compliance with fire safety standards in industrial, commercial, and critical infrastructure environments.