Cable tray connection to cable trunking

Cable trays can be securely connected to cable trunking by aligning the systems, providing proper support, and ensuring continuity and protection of cables.

Key Considerations

Alignment and Support: When connecting a cable tray to a trunking system, ensure both systems are properly aligned to allow smooth cable transition. Cable trays should be supported at intervals not exceeding 1.2 meters for straight runs, while trunking should be supported at 2-meter intervals, with additional fixings near bends or offsets at 150 mm from each side of the fitting . Supports can include steel brackets, threaded rods, or channel hold-down clips, all corrosion-protected. Transition and Continuity: Use appropriate splice plates or transition fittings to join the open tray to the enclosed trunking. Ensure that any cut edges of the tray are smoothed and treated with rust-proofing agents to prevent damage to cables . Earth continuity conductors should be provided across the connection to maintain grounding. Cable Retention: At the point where cables move from tray to trunking, install retaining bars or insulating devices to prevent cables from falling out when covers are removed . All unused holes in the trunking or tray should be sealed with grommets to maintain safety and prevent debris ingress. Clearances and Accessibility: Maintain a minimum clearance of 50 mm from the floor and 150 mm from other services to allow safe installation and future maintenance . Ensure the trunking cover is properly secured with clamps or screws to protect cables from environmental exposure, especially in roof or outdoor installations. Installation Sequence:

1. Inspect and clean both tray and trunking components.
2. Mark the route according to approved shop drawings.
3. Install supports for both systems, ensuring proper spacing and alignment.
4. Cut and prepare tray ends for connection, smoothing edges and applying rust protection.
5. Join tray to trunking using splice plates or transition fittings.
6. Lay cables, install retaining devices, and secure trunking covers.
7. Verify grounding continuity and inspect the installation for compliance with safety standards . By following these steps, the connection between cable trays and trunking will be mechanically secure, electrically safe, and allow for efficient cable management and maintenance.