How to connect a cable tray tee connector

A cable tray tee connector joins three tray sections at a junction, allowing cables to branch off safely while maintaining structural integrity.

Purpose of a Tee Connector

A tee connector is used to create a three-way junction in a cable tray system, enabling one main tray to continue straight while another tray branches off at a perpendicular angle. This is commonly used in installations where cables need to be routed to multiple locations from a single main run .

Installation Steps

1. Align the Trays: Position the main tray and the branch tray so that the tee fitting aligns with all three tray ends.
2. Insert Connectors: Tee connectors typically have three connection points. Insert the tray ends into the connector slots, ensuring the rails fit securely .
3. Secure with Fasteners: Use bolts and combination nuts (commonly FRS M6 truss-head bolts) to fasten the connector to the tray rails. For wider trays (400 mm or more), a joint plate is recommended to prevent transverse bending .
4. Check Clearance: Ensure the tray edges do not interfere with the branch tray. In some cases, minor on-site modifications may be required to fit the branch properly .
5. Support the Junction: Use supporting brackets or suspension rods to maintain stability and prevent sagging at the tee junction .

Material and Compatibility

Tee connectors are available in galvanized steel, stainless steel, aluminum, or FRP to match the tray material. Ensure the connector class matches the tray type (e.g., NEMA Class 12B, 20C) for proper fit and load capacity .

Practical Considerations

• Branch Fittings vs. Tee: Some installations use branch pieces instead of tees for quicker assembly, but these may require on-site modifications to the main tray .
• Cable Protection: Always pass fastening screws through the inner side of the tray to avoid damaging cables .
• Load Distribution: For heavy cable loads, additional support at the tee junction is recommended to prevent bending or sagging . Using a tee connector correctly ensures a secure, organized, and safe cable routing system, maintaining both mechanical stability and electrical safety.