How to secure a flat cable tray

Secure flat cable trays using appropriate supports, proper spacing, vibration-damping hardware, and non-penetrative systems to ensure stability and protect cables.

Choosing the Right Support System

For flat surfaces, especially rooftops, it is recommended to use non-penetrative, freestanding supports rather than placing trays directly on concrete slabs or cut-down struts. These supports, such as rubber or UV-stabilized feet, elevate the tray above the surface, preventing water pooling and reducing trip hazards while protecting the roof membrane and cables. Adjustable supports like the Fix-it Foot or High Bloc allow for height customization and improved clearance for cables and pipes.

Mounting and Fixing Options

Cable trays can be secured using several methods depending on the installation environment: Wall-mounted brackets: Keep trays flush against walls, preventing sagging and movement. Ceiling-mounted supports: Suspend trays to maintain clearance and airflow, ideal for large areas. Floor-mounted bases: Suitable for industrial settings with heavy-duty cables.

Suspended rods: Threaded rods can suspend trays from ceilings, ensuring proper height and stability.

Vibration and Load Considerations

In environments with vibration, such as industrial plants, it is important to use locking fasteners and vibration-damping materials. Ordinary bolts can loosen over time due to vibration, causing tray movement and potential cable damage. Ladder-type trays are preferred over wire mesh trays in high-vibration areas because they are more robust and less prone to weld failure.

Ensure supports are spaced appropriately to handle the weight of the cables and any additional loads.

Safety and Compliance

Follow industry standards such as BS EN 61537 for cable tray systems and BS 6946 for channel supports. Ensure that the tray and supports are strong enough to meet current and future load requirements, and regularly inspect for loose bolts or worn components. Proper installation not only protects cables but also reduces trip hazards and prevents damage to the supporting surface.

Summary

To secure a flat cable tray effectively: Use non-penetrative, adjustable supports to elevate the tray. Select the appropriate mounting method (wall, ceiling, floor, or suspended rods). Incorporate vibration-damping hardware and locking fasteners in high-vibration areas.

Maintain proper support spacing and load capacity. Follow relevant safety standards and perform regular inspections. By combining these practices, you ensure a stable, safe, and long-lasting cable tray installation that protects both the cables and the supporting surface.