Do fire cable trays need to be fixed

Yes, fire-rated cable trays must be securely fixed to the building structure using fire-resistant fixings to ensure safety and compliance.Importance of Fixing Fire Cable TraysFire-rated cable trays are designed to maintain the integrity of electrical circuits during a fire, supporting critical systems such as fire alarms, emergency lighting, and life safety communications. Proper mechanical fixing prevents cables from falling, stretching, or becoming damaged during a fire, which could compromise their function when it is most needed . Non-metallic fixings, plastic ties, or aluminum supports are generally not suitable because they may fail under high temperatures .Regulatory and Safety RequirementsModern wiring regulations, including the 18th Edition, require that all cables, not just those in escape routes, are supported to prevent premature collapse in a fire . Fire-rated cables must be installed with fixings that maintain their position and integrity, ensuring the circuit continues to operate for the required duration, often up to 120 minutes for life safety systems . Fixings must be appropriately sized to avoid crushing insulation or damaging the cable, which could reduce fire performance .Installation and Firestopping ConsiderationsCable trays should be installed according to load capacity, spacing, and ventilation requirements to reduce overheating and fire risk . When passing through walls, floors, or slabs, firestopping materials such as fire-rated boards, mineral wool, or firestop mastic must be used to seal openings tightly, preventing the spread of fire and smoke . Large openings may require fire-resistant backing plates, and all gaps must be sealed both internally and externally .Maintenance and InspectionRoutine inspection is critical. Check that tray connections are firm, straight, and properly aligned, and confirm grounding continuity. Fireproof trays require scheduled inspection for coating integrity and sealing effectiveness . Any signs of corrosion, deformation, or damage should prompt immediate corrective action to maintain fire safety.SummaryFire-rated cable trays must be securely fixed using metal fixings that can withstand high temperatures. Proper installation, firestopping, and regular maintenance are essential to ensure that critical electrical systems remain operational during a fire, protecting both occupants and property .