Cables inside cable trays should be carefully routed into conduits using proper bushings, securing methods, and adherence to bend radius and grounding requirements to ensure safety and compliance.

Preparation and Planning

Before connecting cables to conduits, inspect the cable tray and conduit layout to confirm dimensions, mounting heights, and alignment with approved drawings ( ). Ensure the work area is safe, accessible, and free from obstructions. Identify each cable by feeder name or branch number to maintain organization and simplify future maintenance ( ).

Transition from Tray to Conduit

1. Use Proper Bushings: Install insulating or protective bushings at the conduit entry points to prevent cable insulation damage as cables exit the tray ( ).
2. Maintain Minimum Bend Radius: Ensure cables are not sharply bent when entering the conduit. Follow manufacturer or standard-specified minimum bend radii to avoid stress on conductors ( ).
3. Secure Cables: Use cable ties or clamps at regular intervals to prevent sagging and maintain spacing. Avoid over-tightening, which can damage insulation ( ).
4. Support Conduits: Conduits should be properly supported near the tray exit to prevent movement and stress on the cables ( ).

Grounding and Bonding

Ensure continuous electrical continuity between the tray and conduit system. Steel or aluminum trays can serve as equipment grounding conductors if properly bonded with listed connectors or bonding jumpers ( ). This provides a low-impedance path for fault currents and enhances safety.

Fire and Code Compliance

When the tray-conduit transition passes through fire-rated walls or floors, install approved firestopping systems such as pillows, blocks, or sealants to maintain the fire rating ( ). Always follow NEC 392.60 and local electrical codes for bonding, grounding, and conduit installation.

Best Practices

• Avoid exceeding cable fill limits in trays and conduits to prevent overheating ( ).
• Plan cable routing to minimize interference with other trades and allow easy access for maintenance ( ).
• Use appropriate conduit types (Riser, Plenum, LSZH) depending on the environment ( ).
• For long runs, consider expansion joints in metal trays to accommodate thermal expansion ( ). By following these steps, cables can be safely and efficiently connected from trays into conduits, ensuring mechanical protection, electrical safety, and compliance with standards.