Fixing on the top plate of the cable tray

Cable tray covers are secured using clamps and bolts, with proper torque and positioning to ensure stability and prevent sagging.

General Procedure

Position the Cover: Place the cover on top of the cable tray or ladder, ensuring it aligns with the tray edges and any pre-drilled holes for clamps. Install Clamps: Use HD cover clamps or standard cover clamps depending on tray size. For a typical 3-meter cover, three clamps are recommended, with additional clamps for trays 600 mm wide or larger.

Position clamps evenly along the cover. Bolt and Nut Assembly: Insert the bolt through the clamp and tray, then loosely attach the nut. Ensure the bolt passes through the pre-drilled holes in both the cover and clamp.

For larger trays, a central bolt may be added to prevent sagging. Tightening: Once all clamps and bolts are in place, tighten the nuts and bolts to the recommended torque, typically 6 Nm for standard HD cover clamps. Use a torque wrench to ensure consistent and secure fastening.

Anti-

Sag Measures: For wide trays, use anti-sag clamps in conjunction with HD cover clamps. Drill holes as required and secure with pop rivets or additional bolts to maintain structural integrity. Final Check: Verify that all clamps are properly seated, bolts are tightened to specification, and the cover is flush with the tray.

This ensures long-term stability, safety, and ease of maintenance.

Best Practices

Always use manufacturer-recommended clamps and bolts to match tray type and material. Ensure even spacing of clamps to prevent cover deformation or sagging. For heavy-duty or industrial installations, consider full-height splice plates or bolted couplers for added strength.

Maintain proper torque control to prevent loosening due to vibration or thermal expansion. Follow installation standards such as BS EN 61537 for cable trays and BS 6946 for channel support systems. By following these steps, the top plate or cover of a cable tray will be securely fixed, protecting cables and maintaining the structural integrity of the tray system.