How to install cable trays in cable tray wells

Cable trays in cable tray wells are installed by carefully planning the route, selecting the appropriate tray type, securing supports, and ensuring proper alignment and cable management.Planning and Preparation

Before installation, review the approved shop drawings to determine the tray layout, length, and location within the cable tray well. Inspect all materials, including trays, ladders, and fittings, for damage and compliance with project specifications. Store trays horizontally on a flat surface with timber supports to prevent warping or moisture damage .

Selecting Tray Type and Size

Choose the tray type based on cable type, load, and environmental conditions. Ladder trays are ideal for power cables due to ventilation and easy cable anchoring, while ventilated troughs or solid-bottom trays are better for control or instrumentation cables that require continuous support . Calculate tray width and depth according to cable count and spacing to prevent overheating and ensure proper fill .

Mounting and Support

Install tray supports according to the well's design. Supports can be wall-mounted, floor-mounted, or center-hung, with spacing typically between 1.5 to 3.6 meters depending on tray type and load . Ensure trays are level, straight, and securely fastened using connectors and brackets. In cable tray wells, maintain proper clearance from walls and other structures to allow safe cable routing and future maintenance .

Installing and Securing Cables

Lay cables carefully to avoid damage, maintaining the minimum bend radius as they enter or exit the tray . Use cable ties or clamps to secure cables to the tray rungs or bottom, ensuring even distribution and preventing sagging. For instrumentation or control cables, consider additional protective measures to avoid interference or mechanical stress .

Grounding and Bonding

Ensure all trays are properly bonded and grounded according to NEC Article 392 and local electrical codes. This provides safety against electrical faults and maintains system integrity .

Final Checks

After installation, inspect the tray system for alignment, secure mounting, and proper cable management. Verify that all supports, fittings, and cables comply with design specifications and safety standards . By following these steps, cable trays in cable tray wells can be installed safely, efficiently, and in compliance with electrical codes, ensuring reliable cable routing and easy future maintenance.