Fireproofing of cables inside cable trays

Cables in trays can be effectively fireproofed using specialized coatings, wraps, bandages, or fire-resistant trays to maintain functionality and prevent flame propagation.

Fireproofing Methods

1. Fire-Resistant Coatings: Cables can be coated with intumescent or ablative fire protection materials. These coatings, such as FLAMMOTECT-A or HENSOMASTIK®, form a protective layer that insulates the cable, delays ignition, and prevents flame spread along the cable length. They also enhance resistance to environmental factors like UV radiation, moisture, and chemicals, ensuring long-term durability and operational reliability during a fire . 2. Fireproof Wraps and Bandages: Flexible wraps like FyreWrap® or HENSOTHERM® bandages can be applied around cable bundles in trays. These systems maintain electrical circuit integrity during exposure to fire, allowing critical systems to continue operating or shut down safely. Bandages also reduce smoke and toxic gas release and prevent burning drips from cable sheaths . 3. Fire-Resistant Cable Trays: Specialized trays, such as the Daken Fire-Resistant Cable Tray, integrate fireproofing into the tray itself. These trays use epoxy-based intumescent systems combined with internal metal reinforcement and ventilation grilles. They form a dense char under high temperatures, reducing heat transfer and preventing cable damage while maintaining structural stability and long-span support .

Installation and Layout Considerations

• Segregation: Power and signal cables should be routed separately to minimize interference and allow targeted fireproofing .
• Tray Material: Indoor trays are typically painted steel or galvanized steel, while outdoor or corrosive environments may require stainless steel, aluminum alloy, or fiberglass-reinforced plastic .
• Mechanical Support: Ensure trays are level, plumb, and securely mounted to prevent deformation under full cable load .
• Functional Retention: Fireproofing should comply with standards like DIN 4102-12 or European Technical Assessments (ETA) to ensure cables remain operational during fire events, especially for emergency lighting, alarms, and communication systems .

Key Benefits

• Maintains cable functionality during fire exposure.
• Prevents flame propagation and reduces smoke and toxic gas release.
• Enhances environmental resistance against moisture, UV, chemicals, and mechanical stress.
• Supports regulatory compliance for safety-critical installations in hospitals, airports, industrial plants, and power facilities . By combining coatings, wraps, and fire-resistant trays, cable systems in trays can achieve robust fire protection, ensuring both safety and operational continuity in high-risk environments.