How to properly install a cable tray tee

Installing a cable tray tee involves connecting three tray sections to create a branch while maintaining proper support, alignment, and cable management.

Step 1: Plan and Prepare

Before installation, determine the route of the main tray and the branch. Identify the location for the tee fitting and ensure the pathway is clear of obstructions such as pipes, HVAC ducts, or structural elements. Mark support points for both the main tray and the branch, typically spaced every 1.5 to 2 meters, depending on the tray type and load requirements. Verify compliance with the National Electrical Code (NEC) and local regulations regarding tray fill ratios and support spacing .

Step 2: Gather Tools and Materials

You will need:

• Cable trays and the tee fitting
• Couplers or splice plates
• Mounting brackets, wall arms, or ceiling struts
• Threaded rods and anchor bolts
• Grounding straps
• Power drill, wrench set, measuring tape, level, hacksaw or angle grinder, and file for deburring

Step 3: Install Supports

Install the supports for the main tray and the branch at the marked points. Ensure all supports are level and securely anchored to the wall, ceiling, or floor. The tee fitting should be supported at the same elevation as the main tray to maintain continuous cable support .

Step 4: Connect the Tee Fitting

• Position the tee fitting between the main tray and the branch.
• Align all three tray sections so they are level and properly oriented.
• Use couplers or splice plates to join the tray sections to the tee fitting.
• Tighten all bolts and fasteners securely, ensuring there is no movement at the joints .

Step 5: Verify Alignment and Grounding

• Check that the tee and connected trays are straight, level, and properly supported.
• Install grounding straps to bond the tee fitting and connected trays to the electrical system, ensuring safety and code compliance .

Step 6: Cable Installation

Once the tee fitting is installed and secured, route the cables through the main tray and branch. Maintain proper fill ratios and avoid overcrowding. Use cable ties or clamps as needed to secure cables and prevent sagging .

Best Practices

• Always wear PPE such as gloves, safety glasses, and a hard hat during installation.
• Deburr any cut edges to prevent cable damage.
• Plan for future expansion by leaving adequate space at the tee for additional cables.
• Regularly inspect the installation for sagging, loose fasteners, or damaged trays . By following these steps, a cable tray tee can be installed safely, efficiently, and in compliance with electrical codes, ensuring reliable cable routing and long-term system performance.