How to install ladder-type cable trays

Proper ladder-type cable tray installation ensures safe, durable, and code-compliant cable management while supporting electrical and communication systems effectively.

Planning and Preparation

Before installation, review approved shop drawings to determine tray layout, lengths, and support locations. Conduct a site survey to ensure the area is clear of debris and obstructions, and verify that materials match the approved submittal and specifications . All cable trays, ladders, and accessories should be inspected for damage and stored horizontally on flat surfaces with timber supports at regular intervals, protected from moisture and sunlight .

Material Handling

Cable ladders and trays should be transported using forklifts, cranes, or hand unloading as appropriate, following a safety lifting plan. Accessories and fittings must be organized by type and width to prevent loss and facilitate installation .

Support Structures

Supports must be strong enough to carry the cable load, future additions, and any additional applied loads. Common support methods include threaded rods, Unistrut channels, and center-hung hangers, with maximum support spacing typically around 3.6 meters and load capacities ranging from 318 kg to 340 kg per hanger . Seismic restraints should be installed where required, and supports must be fastened directly to the building structure, avoiding attachment to other services .

Installation Methodology

1. Mark the route on slabs, walls, or ceilings using chalk lines, ensuring alignment with approved drawings .
2. Install supports at marked locations, checking deflection limits and manufacturer recommendations .
3. Assemble cable ladders and trays using standard fittings, ensuring proper spacing and secure connections .
4. Remove burrs and sharp edges to prevent cable damage .
5. Ensure adequate access for cable installation and future maintenance .

Safety Considerations

Cable ladders are not designed for walking or supporting personnel; they are intended solely for cable support . Installation should be performed by competent personnel familiar with electrical safety standards. Pre-start meetings with site engineers, safety officers, and supervisors are recommended to review hazards, tools, and procedures .

Compliance and Best Practices

Follow relevant standards such as BS EN 61537 for cable trays and ladders, and BS 6946 for channel support systems . Use components designed and tested together to ensure system integrity, and coordinate installation with other building services to avoid conflicts . By adhering to these guidelines, ladder-type cable trays can be installed safely, efficiently, and in compliance with industry standards, providing reliable support for electrical and communication cabling.