What cable trays should be used for fire elevator cables

Fire-resistant cable trays, tested to maintain circuit integrity (E90 or higher), are required for elevator cables to ensure operation during a fire.

Recommended Cable Tray Types

For fire elevator cables, the following cable tray types are recommended:

• Steel or Stainless Steel Cable Trays: These are highly durable and maintain structural integrity under high temperatures, making them suitable for high-rise buildings and critical systems .
• Fire-Proof Cable Basket Trays: Systems like Cablofil fire-resistant trays are designed for low and high voltage cables, tested according to DIN 4102-12, ensuring functionality for 30, 60, or 90 minutes at temperatures up to 1000°C .
• Fire-Resistant Support Systems: Products tested according to EN 1363-1 or similar standards guarantee that cables remain operational during fire, preventing collapse and maintaining access for rescue operations .
• Integrated Fire-Resistant Systems: Some manufacturers, such as NIEDAX, provide complete fire-resistant cable tray solutions specifically for elevators, emergency lighting, and reporting systems, ensuring circuit integrity during fire events .

Key Considerations

1. Fire Rating: Choose trays with an E90 rating (or higher), meaning the electrical circuit remains functional for at least 90 minutes during a fire .
2. Material Selection: Steel and stainless steel are preferred for their fire resistance and mechanical strength. Fiber-reinforced plastics may be used in specific cases but must meet fire-resistance standards .
3. Installation Compliance: Follow manufacturer instructions and local fire safety regulations. Use fire-rated fastenings and cleats to secure cables and maintain system integrity .
4. Toxicity and Flame Spread: Select materials that do not emit toxic gases and minimize flame propagation to protect building occupants .
5. System Testing: Ensure the cable tray system has been tested with the actual cables installed, as performance can vary depending on cable type and load .

Additional Protection

• Fireproof Coatings and Tapes: Products like FLAMMOTECT-A or DG-CR 0.7 can be applied to cables within trays to further delay fire spread and maintain functionality .
• Cable Cleats: Use fire-rated cleats, such as Ellis Patents Phoenix Cable Cleats, to secure cables and preserve tray integrity during fire exposure . By selecting fire-resistant steel or basket cable trays with appropriate E90 certification, and following proper installation practices, elevator cables can remain operational during a fire, ensuring safety and compliance with fire protection standards.