How to divide the cable tray in the vertical shaft into T-junctions

Vertical T-junctions in cable trays can be created using semi-T fittings, vertical risers with elbows, or custom tray assemblies to branch cables safely and efficiently.Methods for Creating Vertical T-Junctions1. Using Semi-T Fittings Semi-T fittings are designed to branch a cable tray from a vertical run without reducing the cross-section of the main tray. They are typically mounted with screws to the existing tray and allow cables to sweep smoothly into the branch. For example, the Unex Semi-T requires four screws for secure attachment and maintains the tray's full capacity, making it suitable for both indoor and outdoor installations . 2. Vertical Risers with Elbows Another approach is to create a vertical riser from the main shaft and then add horizontal runs using elbows. This involves:Installing the main vertical tray (backbone) in the shaft.Creating a horizontal run at the desired floor level.Using a downward or upward bend to connect the horizontal tray to the vertical riser.Mirroring or adjusting the bend in a section view to ensure proper alignment and cable sweep . 3. Custom Tray Assemblies Some manufacturers provide assembly guides for creating T-junctions by cutting and bending standard tray sections. This method uses couplers, corner strength bars, and adjustable connectors to secure the intersecting trays. It allows flexibility in planning the route and ensures structural integrity .Design ConsiderationsLoad Capacity: Ensure the tray and fittings can support the weight of the cables, especially at junctions and bends .Cable Segregation: Maintain separation of power, control, and data cables to comply with EMC and safety standards .Bend Radius: Respect the minimum bend radius of cables to prevent damage. Semi-T fittings often specify a radius (e.g., 160 mm) to maintain cable integrity .Support and Anchoring: Vertical T-junctions should be properly anchored to the shaft structure to prevent sagging or misalignment.Practical TipsPlan the vertical and horizontal runs carefully to minimize sharp bends.Use ladder-type trays for vertical shafts to allow easy cable entry and exit.Consider prefabricated T-fittings or BIM content for software modeling to simplify installation planning .Always follow manufacturer instructions and local electrical codes for safety and compliance. By combining these methods and considerations, you can effectively divide a vertical cable tray into T-junctions while maintaining structural integrity, cable protection, and ease of installation.