Cable tray tee fittings are connected using joint plates, clamps, or bolts, with careful alignment and on-site adjustments to ensure secure and continuous cable support.

Standard Connection Procedure

1. Positioning the Tee Fitting The tee fitting is aligned with the main cable tray run and the branch tray. Ensure the tray rails are flush and the fitting is oriented correctly to maintain cable support and proper routing .
2. Using Joint Plates Most tee fittings include integrated joint plates. These plates are inserted between the tray rails and fastened with truss-head bolts and combination nuts. For wider trays (400 mm or more), joint plates are essential to prevent transverse bending under load .
3. Fastening Methods
   • Screws and Bolts: Pass screws through the inner side of the tray rail and secure with combination nuts on the outer side to avoid cable damage .
   • Clamps: Some systems use double clamps (e.g., DOP A2 type) to secure the fitting without penetrating the tray bottom, protecting cables from damage .
4. On-Site Adjustments In some installations, especially when a branch piece is used instead of a pre-fabricated tee, the main tray may need to be cut or modified on-site to fit the branch properly . This allows for faster installation while maintaining structural integrity.
5. Cover Installation If the tee fitting includes a cover, it may be pre-mounted with turn buckles or secured using the tray support. Covers protect cables and maintain aesthetics, particularly in visible installations .

Additional Considerations

• Tray Height and Width: Ensure the fitting matches the tray dimensions (heights 35–110 mm, widths 100–600 mm) to maintain proper alignment .
• Material Compatibility: Tee fittings are available in various materials (steel, aluminum) and finishes; select according to environmental conditions to prevent corrosion .
• Safety: Always avoid damaging cables with screws or bolts. Fasten from the inner side and secure externally to minimize risk . By following these steps, a cable tray tee fitting can be securely connected, providing a reliable path for electrical cables while allowing for future modifications or expansions.