Fireproof cable trays for low-voltage applications

Fireproof cable trays for low-voltage systems are designed to maintain structural integrity and protect cables during fire, using materials like steel, stainless steel, or specialized fire-resistant coatings, and are tested to standards such as DIN 4102-12.Material SelectionFor low-voltage electrical systems, steel and stainless steel trays are commonly used due to their strength and durability, with stainless steel offering superior corrosion resistance . Painted or galvanized steel is suitable for indoor environments, while aluminum or fiberglass-reinforced plastic trays are preferred in corrosive or high-humidity areas . Fire-resistant coatings or specialized fireproof trays, such as Cablofil fireproof cable trays, are designed to withstand high temperatures and prevent fire propagation .Fire Resistance StandardsFireproof cable trays are tested to ensure they can maintain integrity under extreme heat. For example, Cablofil trays are tested according to the German DIN 4102-12 standard, which subjects the entire tray system to temperatures up to 1000°C for 30, 60, and 90 minutes . Other systems, like Durasteel enclosures, are assessed under BS EN 1366-5:2003, evaluating fire resistance from both inside and outside . These standards ensure that low-voltage cables remain operational or protected during a fire.Installation ConsiderationsSegregation: Low-voltage cables should be routed separately from high-voltage or signal cables to reduce interference and fire risk .Mechanical Strength: Tray width and thickness must support the weight of cables without deformation .Firestopping: When trays pass through walls, floors, or slabs, gaps must be sealed with fire-rated boards, mineral wool, or firestop mastic to prevent fire spread .Support and Alignment: Trays must be level, plumb, and securely mounted, with horizontal deviation ≤2 mm/m and vertical deviation ≤3 mm/m .Recommended AccessoriesTo maintain fire integrity, fire-rated cable cleats (e.g., Ellis Patents Phoenix Cable Cleats) are recommended for securing cables within the tray . These prevent cable movement during a fire, reducing the risk of damage or collapse.ApplicationsFireproof cable trays are essential in hospitals, data centers, high-rise buildings, and industrial facilities, where maintaining low-voltage power and communication systems during a fire is critical . Proper selection and installation can minimize equipment damage, ensure safety, and comply with fire protection regulations. By choosing the right material, fireproof standard, and installation method, low-voltage cable systems can be effectively protected against fire hazards, ensuring both safety and operational continuity.