Fireproofing and Sealing of Cable Trays

Effective fireproofing of cable trays involves using intumescent coatings, fireproof pillows, caulks, and approved penetration seals to maintain cable functionality and prevent fire spread.

Fireproof Coatings and Tapes

Products like FLAMMOTECT-A fire protection coating and DG-CR 0.7 fire protection tape provide a protective shield around cables and trays, preventing flame propagation and maintaining cable operation during a fire. These solutions are highly resistant to environmental factors such as UV radiation, moisture, salt water, oil, and chemicals, making them suitable for both indoor and outdoor installations in high-risk areas like hospitals, airports, industrial plants, and power stations .

Fireproof Pillows for Penetrations

AF BAGS are intumescent and ablative fireproof pillows designed to seal cable tray penetrations in walls, floors, and sandwich panels. Certified under EN 1366-3, they can provide fire resistance up to EI 240. The pillows contain intumescent compounds, thermal insulators, and water-release products, allowing a compact sealing depth (e.g., 120 mm for cables up to 21 mm diameter) while being easily repositioned for maintenance .

Firestop Caulks and Putty

Products like 3M Fire Barrier Moldable Putty+ and IC 15WB Caulk are used to seal cable tray edges, outlet boxes, and through-penetrations. These intumescent materials expand under heat to block fire and smoke, protecting structural steel and cable trays. They are suitable for both new construction and retrofitting existing installations, providing flexibility for evolving cable layouts .

Cable Penetration Seals

Cable penetration seals restore the fire resistance of walls and floors where cable trays pass through. Approved systems, including soft seals and mortar-based solutions, ensure compliance with building authority regulations and verified fire tests. They prevent fire and smoke from spreading through openings, maintaining the integrity of the building's fire compartments .

Installation and Best Practices

• Tray Material Selection: Indoor trays typically use painted steel or galvanized steel; outdoor or corrosive environments may require stainless steel, aluminum alloy, or fiberglass-reinforced plastic .
• Routing and Layout: Keep cable routes short, straight, and segregated between power and signal lines to reduce interference and simplify maintenance .
• Sealing Depth and Coverage: Ensure fireproof pillows or caulks fully cover the penetration area, considering cable diameter and tray width.
• Compliance: Use products certified to relevant standards (e.g., EN 1366-3) and follow manufacturer instructions for installation to maintain fire ratings.

Summary

A comprehensive fireproofing strategy for cable trays combines coatings, tapes, pillows, caulks, and penetration seals. These solutions protect cables from fire, smoke, and environmental hazards while ensuring compliance with safety standards and maintaining operational reliability in critical infrastructure .