Dimensions of Fireproof Baffles for Cable Trays

Fireproof baffles for cable trays, such as intumescent pillows, typically require a sealing depth of 120 mm for cables up to 21 mm in diameter, with overall dimensions slightly larger than the tray opening to ensure proper fire containment.

Standard Dimensions and Installation

AF BAGS and similar fireproof pillows are designed to seal cable tray penetrations with the following specifications:

• Sealing Depth: 120 mm for cables up to 21 mm in diameter, sufficient to achieve fire ratings up to EI 240 (EN 1366-3) for walls, floors, and sandwich panels .
• Width Consideration: The baffle or pillow should be approximately 6 inches larger than the outside dimensions of the cable tray to ensure complete coverage and fire containment .
• Casing: Non-combustible fiberglass casing containing intumescent compounds, thermal insulators, and water-release products to minimize heat penetration .
• Flexibility: These baffles are repositionable, allowing for maintenance or modification of cable systems without compromising fire protection .

Fire Ratings and Compliance

• EN 1366-3 Certification: Ensures the baffles meet European fire resistance standards for cable tray penetrations .
• UL and NEMA Compliance: Some products, such as 3M Fire Barrier pillows, are UL-classified and suitable for NEMA-compliant installations .
• Installation Guidance: Fireproof baffles should be installed at the end of the project to allow cable routing, and all gaps around the tray should be sealed tightly to prevent smoke or fire passage .

Practical Considerations

• Cable Diameter: For larger cables, multiple pillows or larger baffles may be required.
• Wall Thickness: The certified side of the baffle is typically 120 mm, but adjustments may be needed for thicker walls or slabs .
• Maintenance: Fireproof pillows can be reused or repositioned, making them suitable for evolving cable layouts . By following these dimensions and installation guidelines, fireproof baffles effectively contain fire and smoke, maintain structural integrity, and comply with international fire safety standards.