How to install light troughs in cable trays

Light troughs can be installed in cable trays by securely mounting them using appropriate brackets, ensuring proper support, grounding, and spacing according to electrical codes.

Planning and Preparation

Before installation, plan the tray route and determine where the light troughs will be positioned. Ensure the cable tray system is suitable for supporting both cables and the additional weight of the light troughs. Consider the type of tray—ventilated troughs are ideal for smaller control cables and can also accommodate light fixtures, while ladder trays provide anchor points for larger fixtures . Check local electrical codes and NEC Article 392 for maximum load, support spacing, and grounding requirements . Ensure the pathway is clear of obstructions like HVAC ducts or pipes.

Mounting Supports

Install tray supports at intervals recommended by the manufacturer, typically every 1.5 to 2 meters. Use trapeze hangers, wall brackets, or center-span supports to secure the tray to the building structure . For light troughs, additional mounting brackets or pivot connectors may be required to attach the fixture securely inside the tray . Drill holes in the tray if necessary, using the fixture's template, and secure with bolts, washers, and spring nuts as specified. Ensure the fixture is level and aligned with the tray.

Installing the Light Trough

1. Position the trough inside the tray, aligning it with the support brackets.
2. Secure the trough using the provided brackets or clamps, ensuring it does not interfere with cable routing.
3. Maintain proper spacing between cables and the light fixture to prevent heat buildup and allow for ventilation .
4. Connect electrical wiring according to the manufacturer's instructions, ensuring all connections are properly insulated and grounded. Use grounding straps to bond the trough to the tray system if required .

Cable Management and Safety

• Use cable ties, cleats, or straps to organize cables around the light trough, keeping them separated by voltage or signal type .
• Avoid exceeding the tray's fill capacity to prevent overheating.
• Ensure the minimum bend radius of cables is maintained near the fixture to prevent insulation damage .

Final Checks

• Verify that all bolts and brackets are tightened to the specified torque.
• Confirm that the light trough is secure, level, and properly grounded.
• Test the lighting system to ensure proper operation before completing the installation. By following these steps, light troughs can be safely and efficiently integrated into cable tray systems, providing both illumination and organized cable management while maintaining compliance with electrical standards .