Article Overview
When a cable tray passes through a side wall, it must be properly firestopped and protected using sleeves, intumescent coatings, or fire-rated materials to maintain wall integrity and safety.
Firestopping Requirements
Cable trays penetrating walls, especially fire-rated walls, must be sealed to prevent fire and smoke from spreading. Openings should be tightly sealed with firestop materials such as fire-rated boards, firestop packs, firestop mastic, or fire-resistant mineral wool. Gaps between the cable tray and wall should not exceed 1 cm², and packing thickness should be at least 24 cm. Cover plates should be square, evenly painted, and fully close the opening to maintain fire integrity .
Use of Sleeves
A recommended method is to install a sleeve system. The cable tray is stopped a few feet short of the wall, a sleeve is installed through the wall, and the tray continues on the other side. This allows the intumescent material to expand properly and provides a controlled penetration that can be firestopped to match the wall rating. Sleeves also facilitate grounding and reduce the risk of fire spread due to heat conduction through the metal tray .
Intumescent Coatings
If a cable tray must pass directly through a fire-rated wall, it should be coated with an intumescent material for a sufficient distance on both sides of the wall. Intumescent coatings expand when exposed to heat, sealing gaps and protecting combustible materials on the opposite side .
Installation Considerations
- Ensure the wall and floor finishes are complete before firestopping .
- For large openings, install a fire-resistant backing plate before sealing .
- Maintain reasonable layout and positioning to allow future maintenance and cable additions .
- Use UL-listed or EN-tested firestop products to ensure compliance with safety standards .
Summary
Properly passing a cable tray through a side wall requires firestopping, protective sleeves, or intumescent coatings, careful sealing of gaps, and adherence to tested fire-rated systems. This approach ensures safety, maintains wall integrity, and allows for future maintenance without compromising fire protection.
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