How to seal the edges of cable trays
Use edge protectors, grommets, or fireproof sealing pillows to safely cover and seal cable tray edges, preventing abrasion, environmental damage, and fire hazards.
Edge Protection with Grommets and Sleeves
Sharp edges on cable trays can damage cables over time. Flexible grommet strips or EdgeGuard grommets are ideal for covering straight or irregular cut-outs. These are typically made of PVC or flame-retardant PVC-FR, and they provide strain relief, bend protection, and abrasion resistance for cables routed along sharp edges . For metallic trays, protector sleeves with stainless steel inner cores can be used to grip the tray securely while preventing corrosion and rust .
End Caps and Covers
For open ends of cable trays or Unistrut channels, PVC or halogen-free end caps can be installed to cover the side of the channel after installation. These end caps prevent cables from rubbing against sharp edges and provide a neat, finished appearance . Stainless steel end caps are also available for high-durability applications.
Fireproof Sealing
In areas where fire safety is critical, intumescent fireproof pillows (AF BAGS) can be used to seal cable tray penetrations. These are certified under EN 1366-3 and can provide protection up to EI 240. They consist of a non-combustible fiberglass casing filled with intumescent compounds and thermal insulators, which expand under heat to seal gaps around cables . This method is particularly useful for wall, floor, or sandwich panel penetrations.
Additional Sealing Techniques
For environmental protection against dust, moisture, or gases, cable entry seals, compression seals, or multi-cable entry seals can be applied at tray edges or entry points. These seals prevent contaminants from entering the system and maintain system efficiency . Duct seal putty or specialized sealants can also be used to fill small gaps around cables, providing a non-conductive, moisture-resistant barrier .
Installation Tips
- Measure the tray and cable dimensions to select the correct size of grommet, sleeve, or fireproof pillow .
- Clean the tray edges and cables to ensure proper adhesion and fit of protective components .
- Install grommets or sleeves along the edges before laying cables to prevent abrasion.
- Use end caps for open tray ends to secure cables and improve safety.
- Apply fireproof pillows in penetrations where fire resistance is required, ensuring the certified depth and coverage are met . By combining mechanical edge protection, environmental sealing, and fireproof solutions, you can effectively seal cable tray edges, prolong cable life, and maintain safety and compliance.
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