Ladder-type cable trays should be installed using proper support systems, alignment, and spacing to ensure safe, durable, and code-compliant cable management.

Preparation and Material Handling

Before installation, all cable trays, ladders, and accessories must be inspected for damage and verified against approved shop drawings. Materials should be stored horizontally on a flat surface with timber supports at intervals of approximately one meter to prevent bending or moisture damage, and they should be protected from direct sunlight and rain during storage . Only approved materials should be used, and any discrepancies must be reported immediately.

Route Marking and Layout

The installation area should be cleared and marked according to the approved shop drawings. Routes should be planned for horizontal and vertical runs only, avoiding interference with other services. Adequate clearance must be maintained for cable pulling, future maintenance, and ventilation . Structural members should not be cut or drilled without approval from the project engineer or general contractor .

Support Systems

Ladder trays are supported using trapeze, swing, or threaded rod hangers. The most common method is the trapeze support, where vertical hangers are threaded through cross members, with hex nuts and washers used to adjust and level the tray. The cross member should allow for horizontal adjustment and secure attachment of tray clips . Supports must be strong enough to carry the cable load, including future additions, and should comply with deflection limits specified by the manufacturer .

Installation Sequence

1. Install supports first: Position vertical hangers and cross members, ensuring they are level and aligned.
2. Place ladder trays: Attach trays to the supports using tray clips, either inside or outside the tray, depending on site conditions.
3. Check alignment and level: Ensure the trays are straight, level, and properly spaced.
4. Secure connections: Tighten all nuts and bolts, leaving slight adjustment room for final leveling.
5. Verify clearances: Confirm that there is sufficient space for cable pulling and maintenance .

Safety and Best Practices

• Ladder trays are mechanical support systems for cables only and should not be used as walkways or lifting apparatus .
• All personnel must be trained and competent in electrical installation practices.
• Follow local codes and standards such as BS EN 61537 or the Canadian Electrical Code (CEC) for design and installation .
• Avoid overloading trays and ensure proper grounding and bonding where required. By following these steps, ladder-type cable trays can be installed safely, efficiently, and in compliance with industry standards, ensuring long-term reliability and ease of maintenance.