Thickness of fireproof partition inside cable tray
The minimum recommended thickness for fireproof partitions inside cable trays is 10 millimeters.
Material and Fire Resistance Requirements
Fireproof partitions, also known as fire-blocking sections or fire sections, should be made of non-combustible materials such as gypsum board, mineral wool board, or aluminum-plastic board to ensure effective fire resistance . These partitions are designed to isolate fires within cable trays, preventing the spread of fire along the tray and protecting adjacent equipment and structures .
Installation Guidelines
- Thickness: The partition should be ≥10 mm to maintain fire resistance performance .
- Positioning: Install the partition at least 100 mm away from the edge of the tray to maximize fire containment .
- Width: The partition width should be equal to or greater than the tray width to fully block fire propagation .
- Fixing: Secure the partition with fasteners to ensure stability and reliability .
- Observation: Include observation holes if needed to monitor the internal condition of the tray .
- Maintenance: Regular inspection and maintenance are recommended to ensure the partition remains effective over time .
Additional Considerations
For larger openings or complex cable tray layouts, fire-resistant backing plates, firestop packs, or intumescent materials may be used to enhance fire protection . The gap between firestop materials and cables should be minimal, typically not exceeding 1 cm², and the packing thickness may be up to 24 cm for high-risk installations . Using appropriate fireproof partitions and materials ensures compliance with fire safety standards, reduces the risk of fire propagation, and enhances the overall safety of electrical installations in industrial and commercial settings .
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