Converting cable trays into distribution boxes

Cable trays can be adapted into distribution boxes by creating enclosed sections with proper access, terminations, and protection for cables while maintaining safety and organization.

Understanding the Concept

Cable trays are primarily designed to support and route cables over long distances, providing an open pathway for power, control, or data cables ( ). Distribution boxes, on the other hand, are enclosed points where cables are terminated, branched, or connected to other circuits or devices ( ). Converting a cable tray into a distribution box involves enclosing a section of the tray, adding cable entry/exit points, and providing secure mounting for terminations.

Steps for Conversion

1. Select the Tray Section: Identify a section of the cable tray where branching or terminations are required. Ensure it is accessible and structurally supported ( ).
2. Enclosure Installation: Use a metal or non-metallic enclosure compatible with the tray dimensions. This can be a custom box or a pre-fabricated wireway enclosure that fits over the tray section ( ).
3. Cable Entry and Exit: Cut or provide openings in the enclosure for cables to enter and exit. Use grommets or bushings to prevent abrasion and maintain safety standards ( ).
4. Mounting Termination Hardware: Install terminal blocks, patch panels, or connectors inside the enclosure to organize and secure cable connections ( ).
5. Grounding and Bonding: Ensure the tray and enclosure are properly bonded to the electrical ground to prevent electrical hazards ( ).
6. Labeling and Identification: Clearly label all cables and connections for easy maintenance and troubleshooting ( ).
7. Access and Maintenance: Provide removable covers or hinged doors to allow inspection, maintenance, and future expansion ( ).

Considerations

• Compliance: Ensure the modified tray and enclosure meet local electrical codes and safety standards.
• Environmental Protection: If the installation is in a harsh environment, consider dustproof or waterproof enclosures.
• Load Capacity: Verify that the tray can support the additional weight of the enclosure and termination hardware.
• Heat Dissipation: Maintain adequate ventilation to prevent overheating of cables inside the enclosed section.

Alternatives

If a full conversion is impractical, consider using dedicated cable distribution boxes or wireway enclosures mounted adjacent to the tray. These provide similar functionality without extensive modification ( ). By following these steps, a cable tray can be effectively adapted into a functional distribution box, combining the structural support of the tray with the organized, protected environment of a junction box.