Cable tray tee cannot be covered

Cable tray tees typically cannot be covered due to their three-connector design and the need for on-site modifications to maintain proper cable routing and airflow.

Design and Installation Considerations

A cable tray tee is designed to connect three tray runs at a junction point. Unlike straight or branch pieces, the tee requires three connectors to maintain structural integrity and proper cable support. Covering a tee is often impractical because the upturned edges of the main tray intersect the throat of the take-off, making a solid cover difficult to fit without modification . Attempting to cover a tee can interfere with cable placement, airflow, and heat dissipation.

Airflow and Heat Dissipation

Cable trays, especially ladder-type trays, are often left uncovered to maximize airflow and dissipate heat generated by current-carrying conductors. Covering a tee could restrict ventilation, leading to overheating and potential damage to cables . Ladder trays without covers also minimize dust accumulation and prevent moisture from collecting, which is particularly important at junctions like tees.

Practical Workarounds

In real-world installations, some companies use branch pieces instead of tees to simplify connections. These branch pieces typically have only one connector and require the main tray to be modified on-site, such as chopping the upstand edge to allow proper alignment . In software modeling tools like Revit, a tee is the only standard fitting option, but it can be visually modified to mimic a branch fitting while maintaining three connections for structural and electrical compliance.

Safety and Maintenance

Leaving tees uncovered also facilitates easier inspection, maintenance, and cable management. Covers at junctions can complicate access, making it harder to add or remove cables and increasing the risk of mechanical damage or improper cable support . Proper labeling and annotation are recommended when tees are left uncovered to ensure clarity for maintenance personnel. In summary, cable tray tees are generally left uncovered due to structural, airflow, and practical installation reasons, and while branch fittings can sometimes be used as alternatives, they require on-site modifications to the main tray to function correctly .