Solution for Sealing Cable Trays in Low Voltage Wiring Shafts

Modular firestop systems, foam-based seals, and heat-shrinkable cable entry seals provide effective solutions for sealing cable trays in low voltage wiring shafts.

Modular Firestop Systems

FIRSTO firestops are designed specifically for multi-cable and cable tray penetrations through fire-rated walls and floors. They are modular, easy to assemble around existing cable runs, and allow for later addition or removal of cables. These systems prevent the spread of smoke and fire while withstanding mechanical loads, making them ideal for low voltage wiring shafts in commercial or industrial buildings (CSD Sealing Systems) .

Foam-Based Sealing Solutions

FYLLOFOAM is a foam rubber system suitable for sealing cable trays passing through conduit openings. It is fire-tested for up to E240 rating and can be combined with conduit sleeves or frames for B-class or A60/E160-rated penetrations. The foam sheets can be cut to size, and gaps around cables can be filled with kneadable rubber like FIRAQUA to ensure smoke tightness. This solution is particularly effective in sandwich constructions or walls with varying thicknesses (Beele) . EPDM, neoprene, and foil-faced foams are also recommended for cable entry sealing. These materials provide water, gas, and fire resistance, as well as thermal and acoustic insulation. EPDM foam offers excellent UV and ozone resistance, while neoprene blends provide flexibility and durability for general-purpose sealing (BCB International) .

Heat-Shrinkable Cable Entry Seals

Raychem cable entry seals (CES) are heat-shrinkable, watertight, and fume-tight solutions for cable penetrations into panels, junction boxes, or bulkheads. They can accommodate single or multiple cables and are available with factory-applied adhesive for secure installation. These seals are suitable for applications requiring long-term environmental protection and can be used in aerospace, industrial, or commercial settings (TE Connectivity) .

Key Considerations

• Fire Rating: Ensure the chosen system meets the required fire-resistance rating for walls or floors.
• Cable Flexibility: Modular or foam systems allow for easy addition or removal of cables.
• Environmental Protection: Select materials that provide water, gas, and smoke tightness.
• Mechanical Load: Systems like FIRSTO can withstand heavy mechanical stress, important for cable trays in shafts. By combining modular firestop systems, foam-based seals, and heat-shrinkable cable entry seals, you can achieve a comprehensive, fire-safe, and watertight solution for sealing cable trays in low voltage wiring shafts.