Cables can be placed in cable trays in the middle

Cables can be placed in the middle of a cable tray as long as they are properly secured, organized, and the tray fill limits are not exceeded.

Proper Placement and Securing

Cables within a tray should be laid straight and orderly, avoiding overlaps or crossings, and can be positioned in the middle of the tray for balanced load distribution. They must be secured at the start, end, and at regular intervals along the tray—typically every 3 to 5 meters for horizontal runs and every 1. 5 meters for vertical runs.

Cable ties or other listed securement devices should be used, ensuring even tension without damaging the cables.

Tray Fill and Clearance Considerations

The cross-sectional fill of the tray should not exceed 50% to allow proper airflow and prevent overheating. When placing cables in the middle, ensure that the tray width and height provide adequate clearance from the tray edges and any covers. For concealed installations, maintain at least 80 mm vertical clearance from the cover access side.

Compliance with NEC StandardsAccording to NEC Article 392, only approved tray-rated cables should be installed, and metallic trays must be properly grounded. Cables of different voltages can share the same tray if they meet NEC separation and fill requirements, but higher-voltage cables may require barriers. Proper placement in the middle does not violate NEC rules as long as these standards are followed.

Practical Tips

Centering cables can improve aesthetics and make future maintenance easier. Avoid placing cables too close to tray edges to prevent abrasion or damage. Ensure bends and turns are securely fastened to maintain cable integrity.

For heavy or large cables, consider distributing weight evenly across the tray rungs to prevent sagging. By following these guidelines, placing cables in the middle of a cable tray is both safe and compliant with industry standards.