Fireproof bricks, blocks, and intumescent devices are used to protect cable trays from fire, smoke, and heat penetration, ensuring compliance with fire safety standards.

Types of Fireproof Bricks and Blocks

1. Firestop Blocks (CFS-BL) These are pre-formed blocks designed to seal openings around cable trays, preventing fire and smoke spread. They are available in various shapes such as bricks, plugs, or cushions and are suitable for both new construction and retrofits. They are UL or ETA certified for firestop applications and can be used in concrete, gypsum, or other fire-rated walls . 2. Intumescent Blocks Intumescent urethane foam blocks expand when exposed to high temperatures, filling gaps and impeding fire, smoke, and gas passage. Products like the EZ-Path Cable Tray Retrofit Device allow stacking in a brick-like fashion around cable trays, providing up to 100% visual fill and restoring fire resistance without additional sealants . 3. Moldable Putty and Caulks For smaller penetrations or irregular openings, moldable putty or intumescent caulks can complement fireproof bricks. These materials adhere to surfaces, conform to shapes, and block heat penetration, protecting both the cable tray and surrounding structure .

Installation Considerations

• Sizing: Ensure the fireproof block or brick is sized to cover the opening around the cable tray, typically 1.5 inches larger than the tray on all sides for optimal protection .
• Stacking and Compression: Intumescent blocks are often compressed and stacked to fill the opening completely.
• Compatibility: Check that the product is compatible with the wall type (concrete, gypsum, or other fire-rated assemblies) and cable tray style (ladder, solid bottom, or channel).
• Certifications: Use products with UL, ETA, or other recognized fire ratings to ensure compliance with local fire codes and standards .

Advantages

• Rapid Installation: Pre-formed blocks and retrofit devices allow quick installation without disrupting active cable systems.
• Fire and Smoke Containment: Blocks and intumescent materials prevent fire spread along cable trays and protect structural elements.
• Reusability: Some systems, like the EZ-Path device, can be reused for additional cables or retrofits . Using fireproof bricks or blocks for cable trays is essential for maintaining fire-rated penetrations, protecting electrical infrastructure, and ensuring compliance with safety regulations. Selecting the right type depends on the wall construction, tray size, and whether the installation is new or a retrofit.