Fireproofing treatment for cable tray bends

Effective fireproofing for cable tray bends can be achieved using intumescent wraps, fire-resistant coatings, and firestop pillows to maintain cable integrity and prevent flame propagation.

Fire-Resistant Coatings and Tapes

Products like FLAMMOTECT-A and DG-CR 0.7 fire protection tape provide a protective shield around cables, including those in bends, delaying fire spread and maintaining functionality during a fire. These coatings are resistant to environmental factors such as UV, moisture, and chemicals, making them suitable for both indoor and outdoor installations in industrial, commercial, and sensitive facilities like hospitals or power plants (Flamro) .

Fire Protection Wraps and Bandages

Fire protection wraps and bandages are flexible, heat-resistant materials that can be wrapped around cable tray bends. They expand under heat to seal gaps and prevent fire propagation along the cable system. Their high elasticity allows them to conform to bends and irregular shapes, ensuring complete coverage without compromising cable access for maintenance (Flamro) .

Intumescent Fireproof Pillows

AF BAGS are intumescent and ablative fireproof pillows designed for cable tray penetrations, including bends. They consist of a non-combustible fiberglass casing filled with intumescent compounds and thermal insulators. These pillows can be inserted into bends or tight spaces, providing fire protection up to EI 240 (EN 1366-3). They are repositionable, facilitating maintenance or system modifications, and are suitable for cables up to 21 mm in diameter (AF Systems) .

Firestop Materials for Penetrations

For cable tray bends that pass through walls or slabs, firestop packs, mineral wool, and intumescent caulks can be used to seal gaps. Proper installation requires tight packing without voids, with a recommended gap area not exceeding 1 cm² and a minimum packing thickness of 24 cm. Firestop materials ensure that fire and smoke are contained at the penetration point, maintaining the integrity of the cable system (AllPCB) .

Installation Considerations

• Ensure complete coverage of the bend with wraps, coatings, or pillows.
• Use flexible materials for tight or irregular bends to maintain fireproofing continuity.
• Verify product certifications (e.g., EN 1366-3, ETA) for compliance with local fire safety standards.
• Consider environmental resistance if the cable tray is exposed to UV, moisture, or chemicals.
• Maintain accessibility for inspection and maintenance by using repositionable solutions like intumescent pillows. By combining these solutions—coatings, wraps, and pillows—cable tray bends can be effectively protected against fire, ensuring both safety and operational continuity.