Cable Tray Installation with Hangers

Proper cable tray installation with hangers ensures safe, level, and durable support for electrical cables, preventing sagging and structural failure.

Planning and Preparation

Before installation, plan the tray route carefully, considering clearance, load capacity, and cable separation requirements. Review approved shop drawings and verify that all materials, including trays, ladders, and fittings, meet project specifications and are free from damage . Store trays horizontally on flat surfaces with timber supports to prevent deformation and protect from moisture .

Hanger Selection and Spacing

Hangers are the primary support for cable trays, and their spacing depends on tray type and cable load. General guidelines include:

• Heavy power cables: hangers every 1–1.5 meters to prevent sagging .
• Light cables (internet, phone): hangers can be spaced up to 3 meters .
• Maximum support spacing: typically 3.6 meters, with a maximum load per hanger of 318–340 kg . Choose hangers and rods that exceed the current load by at least 25% to allow for future cable additions and ensure system stability . For high ceilings or obstructed areas, wall-mounted metal arms can be used, ensuring bolts are strong enough to anchor the tray securely .

Installation Techniques

• Ceiling or overhead installation: use threaded rods, beam clamps, or heavy horizontal bars to suspend trays. Two rods with a horizontal bar provide maximum stability for multiple stacked trays .
• Wall-mounted installation: secure trays with metal arms and strong wall bolts, especially when supporting heavy cables .
• Center-hung trays: suitable for light cables, using a single rod or bolt for faster assembly . Ensure trays are level, straight, and aligned. Connectors and fittings should be tightened properly, and care should be taken to avoid coating damage on galvanized trays .

Safety and Standards

• Install trays according to BS EN 61537 or equivalent standards for cable tray systems .
• Cable trays are supports for cables only, not walkways or ladders, to prevent personal injury .
• Avoid overloading hangers and maintain proper spacing to prevent bending or collapse .

Material Considerations

• Steel (galvanized or stainless), aluminum, and fiberglass are common tray materials .
• For wet or corrosive environments, hot-dip galvanized finishes are recommended .

Summary

Proper cable tray installation using hangers involves careful planning, correct hanger selection, appropriate spacing, and adherence to safety standards. Following these practices ensures a durable, safe, and scalable cable management system that can accommodate future expansions without structural issues .