The cable tray tee method involves connecting a branch tray perpendicularly to a main tray using a T-piece fitting, ensuring proper alignment, support, and secure attachment.

Overview of the Tee Method

A tee connection in a cable tray system allows a branch tray to extend from a main tray, forming a T-shaped junction. This is commonly used to route cables from a main distribution path to equipment, panels, or other devices. Tee fittings are available in ventilated, solid, or wire-mesh tray types, depending on the application and environmental requirements .

Installation Steps

1. Tray Cutting and Preparation
   • Cut the main tray and branch tray ends squarely to ensure a flush fit.
   • Remove any sharp edges to prevent cable damage.
   • Tee fittings may require minor adjustments or trimming to align with the trays .
2. Fitting Attachment
   • Position the T-piece fitting at the junction of the main and branch trays.
   • Secure the fitting using tray clips, bolts, or other manufacturer-recommended fasteners.
   • Ensure the branch tray is aligned at a 90-degree angle to the main tray .
3. Support and Load Distribution
   • Use trapeze or swing supports to hold the trays in place, maintaining level alignment.
   • Vertical hangers should pass through cross members with sufficient clearance for adjustment.
   • Ensure the tee junction is supported adequately to handle the combined weight of cables in both trays .
4. Cable Management Considerations
   • Maintain minimum bend radius for cables exiting the tee to prevent stress or damage.
   • Keep rung spacing consistent (typically 6–9 inches) to support cables evenly .
   • For instrumentation or control cables, consider additional protection or covers if required.

Best Practices

• Always follow manufacturer guidelines for tray accessories and fittings.
• Ensure compliance with NEC® or local electrical codes regarding tray installation and support spacing .
• Avoid using trays as lifting points during handling; always use proper slings or supports .
• Verify that the tee junction does not interfere with cable routing or create sharp bends that exceed recommended radii. By following these steps, a cable tray tee can be installed safely and efficiently, providing a reliable path for branching cables while maintaining structural integrity and compliance with electrical standards.