Ladder-type cable tray installation scheme

Ladder-style cable trays should be installed following approved shop drawings, proper support spacing, and safety standards to ensure secure, accessible, and load-compliant cable management.

Planning and Preparation

Before installation, review the approved shop drawings to determine the layout, length, and location of the cable trays and ladders in the building. Inspect all materials upon delivery to ensure they match the approved submittal and are free from damage. Store trays horizontally on a flat surface with timber supports at intervals of about one meter, protecting them from moisture and sunlight.

Ensure all personnel involved are competent and familiar with electrical installation practices and safety standards.

Support and Mounting

Ladder trays must be supported at regular intervals to prevent sagging and maintain load capacity. Typical support spacing is 1. 2 meters on center for straight runs, with additional supports near bends, offsets, or junctions.

Supports can be mounted to floors, walls, ceilings, or equipment racks using threaded rods, Unistrut channels, or other approved hardware. Ensure supports are strong enough to carry the total cable load, including future additions, and avoid cutting or drilling structural members without approval.

Installation Sequence

Mark the route on slabs, walls, or ceilings using a chalk line to match the approved drawings. Install supports at the designated intervals, ensuring alignment and level positioning. Place ladder trays onto the supports, securing them with spring knots, bolts, or other manufacturer-recommended fasteners.

Connect tray sections using standard fittings, maintaining proper gaps and alignment for smooth cable routing. Install bends, offsets, and junctions with additional supports within 150 mm of each fitting to maintain stability. Check for sharp edges or burrs and remove them to prevent cable damage.

Safety and Best Practices

Ladder trays are not designed to support personnel; they are intended solely for cable support. Ensure trays are properly grounded and, where required, seismic restraints are installed. Maintain sufficient space for cable installation and future maintenance.

Cover trays exposed to direct sunlight or heat to prevent cable degradation. Use cable retaining bars or insulating devices to prevent cables from falling out when covers are removed.

Material Considerations

Ladder trays are typically made of tubular steel and come in various widths and load classes to match the expected cable load. Select a tray class that reflects the total working load and support span for each application to ensure safety and cost-effectiveness. By following these steps and adhering to manufacturer guidelines and safety standards, ladder-style cable trays can be installed efficiently, providing durable and organized cable management for electrical and data systems.