Installation of Vertical Prefabricated Tees for Cable Trays

A vertical tee in a cable tray system allows a branch to rise from the main tray while maintaining continuous cable support and structural integrity.Overview of Vertical Tee FittingsA vertical tee is a specialized cable tray fitting that connects three tray sections, creating a branch that rises above the main tray route. Unlike horizontal tees, vertical tees are used when cables need to transition to a higher elevation, such as feeding equipment on upper floors or connecting to overhead conduits . Proper selection ensures efficient cable routing, reduces field modifications, and maintains long-term system reliability .Installation StepsSelect the Appropriate Tee TypeChoose a vertical tee compatible with your tray system (ladder, ventilated trough, or wire mesh) and material (aluminum, steel, or FRP) based on environmental conditions and load requirements .Ensure the tee accommodates the cable types and sizes planned for the branch.Prepare the Main TrayMeasure and mark the location where the vertical branch will rise.Cut the main tray section cleanly using appropriate cutters, avoiding rough or burred edges that could damage cables .Install the Vertical TeePosition the vertical tee so that the main tray and branch align correctly.Use splice kits or connectors to secure the tee to the main tray, ensuring a continuous support path for cables .For software-based design (e.g., Revit), a vertical tee may need to be created as a custom family and placed manually, as standard libraries often only include horizontal tees .Support the Tee and BranchProvide adequate support for the vertical branch using wall brackets, trapeze hangers, or cantilever supports depending on the installation environment .Support spacing should comply with manufacturer recommendations and NEC guidelines to prevent sagging or overloading.Cable Routing and FillRoute cables through the vertical branch carefully, maintaining minimum bend radii to prevent damage .Verify that the total cable fill does not exceed the tray's rated capacity according to NEC 392.22, and consider ampacity derating for high-density installations .Bonding and GroundingEnsure all tray sections, including the vertical tee, are properly bonded and grounded to maintain electrical safety .Best PracticesAvoid overfilling the tray to maintain airflow and prevent overheating.Use covers if required for environmental protection or aesthetic purposes.Inspect the installation for alignment, secure connections, and proper support before pulling cables.Plan for future expansion by leaving space for additional cables in the vertical branch . By following these steps, a vertical tee can be safely and efficiently integrated into a cable tray system, ensuring reliable cable support and compliance with electrical codes.