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Fireproof sealing of cable shafts and cable trays in high-rise buildings

Fireproof sealing of cable shafts and cable trays in high-rise buildings

Effective fireproof sealing of cable shafts and trays in high-rise buildings relies on proper materials, installation techniques, and compliance with fire safety standards to prevent fire and smoke spread.Key PrinciplesFireproof sealing in high-rise buildings is critical because cable shafts can act as chimneys, rapidly spreading fire and smoke between floors, increasing danger and complicating firefighting efforts . The performance of a fireproof sealing system depends not only on the material properties but also on the construction process, including gap size, packing, and installation integrity .Materials and SystemsFire-Resistant Coatings and TapesProducts like FLAMMOTECT-A and DG-CR 0.7 form a protective shield around cables, preventing flame propagation and maintaining cable functionality during fire .These coatings also enhance resistance to environmental factors such as UV, moisture, and chemicals, making them suitable for both indoor and outdoor applications .Modular Firestop SystemsSystems like FIRSTO are designed for multi-cable and cable tray penetrations through fire-rated walls and floors.They are modular, easy to install, and allow for later addition or removal of cables without compromising fire protection .FIRSTO systems prevent smoke and fire spread while withstanding mechanical loads, making them ideal for high-rise building applications .Penetration Sealing MaterialsFire-rated boards, firestop packs, firestop mastic, and fire-resistant mineral wool are commonly used to seal gaps around cables and trays .For large openings, a fire-resistant backing plate should be installed before sealing.Gaps between firestop packs and cables should not exceed 1 cm², and packing thickness should be at least 24 cm .All gaps inside and around metal trunking must be sealed completely, and cover plates should be properly dimensioned and painted for uniformity .Comprehensive Fire Protection PortfoliosCompanies like KBS provide a range of fire protection products for cable penetrations, including coatings and sealing systems, tested to meet international standards and building code requirements .These systems are validated through fire tests and certifications, ensuring reliable performance in emergencies .Installation ConsiderationsEnsure floor and wall finishes in electrical shafts are completed before firestopping.Follow a stepwise process: reserved openings → busway installation → distribution box installation → conduit and cable routing → grounding → waterproofing → firestopping .Sealing must be tight and crack-free, with orderly placement of firestop packs.Proper layout and positioning facilitate both installation and future maintenance .Performance EvaluationFireproof sealing systems should be evaluated for thermal insulation, smoke sealing capacity, and overall integrity .Fire dynamics simulations and entity tests can reveal failure points, such as cracking, and the effect of gap size on smoke and flame diffusion .Regular inspection and maintenance are essential to ensure long-term effectiveness.SummaryFor high-rise buildings, fireproof sealing of cable shafts and trays requires a combination of high-quality materials, modular systems, precise installation, and compliance with fire safety standards. Using coatings, tapes, firestop packs, and modular systems like FIRSTO or KBS ensures that cables remain functional during fire, prevents smoke and flame spread, and supports safe evacuation and firefighting operations .

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