Installation of Combined Enclosed Cable Trays

Enclosed cable trays are installed by carefully planning the layout, selecting the appropriate tray type and size, mounting with proper supports, laying cables neatly, grounding, and performing final inspections to ensure safety and compliance.

Planning and Tray Selection

Before installation, plan the cable tray route considering cable types, load, and environmental conditions. Enclosed trays, which can have solid or ventilated bottoms, are ideal for protecting cables from dust, moisture, and mechanical damage, and are often used where aesthetics or electromagnetic interference protection is important. Select the tray material—steel, aluminum, stainless steel, or fiberglass—based on corrosion resistance, strength, and environmental exposure.

Mounting Supports

Enclosed cable trays are typically mounted using trapeze or swing supports. Install vertical hangers at the required spacing (usually 1. 5 to 3 meters apart depending on load and tray type).

Thread hex nuts and slide on square washers, then attach cross members ensuring they are level. The cross member should allow for horizontal adjustment and proper attachment of tray clips. Secure the tray using connectors and fittings, aligning it straight and level.

Laying Cables

Lay cables neatly inside the tray, separating by voltage and function. Use cable ties or straps to organize cables and leave sufficient slack for expansion or future adjustments. Avoid overfilling the tray to prevent overheating and maintain airflow if the tray is ventilated.

Grounding and Bonding

For metal trays, grounding and bonding are essential. Use proper bonding jumpers across tray sections to maintain electrical continuity and comply with safety standards. This ensures protection against electrical faults and reduces electromagnetic interference.

Labeling and Documentation

Label all cables clearly and maintain an updated wiring map. Proper documentation aids in troubleshooting, future modifications, and compliance with standards such as IEC 61537 and NEC Article 392.

Final Inspection and Maintenance

Perform a thorough walkthrough to check for loose clamps, misalignment, or unsupported spans. Routine maintenance should include checking for corrosion, loose wires, or damaged components to extend the tray's lifespan and ensure system reliability. By following these steps, enclosed cable trays can be installed safely, efficiently, and in compliance with electrical and building codes, providing long-term protection and organization for electrical cables.