How to make a support for a trapezoidal cable tray

A trapeze support for a cable tray can be constructed using slotted strut channels suspended from threaded rods, providing a secure and adjustable framework for the tray.Materials Needed

• Slotted strut channels (deep channel or standard strut type) sized to match the width of the cable tray
• Threaded rods (M10 or M12 recommended) for suspension from ceilings or beams
• Nuts, washers, and brackets for securing the strut to the rods
• Optional: lightweight tubular rails for easier handling in overhead installations

Step-by-Step Construction

1. Measure and Plan Determine the length of the cable tray run and the spacing of supports. Typical spans depend on tray type and load but generally range from 1.5 to 3 meters. Ensure the support spacing complies with NEC Article 392 or local codes .
2. Cut and Prepare Strut Channels Cut the strut channels to the required length. If using slotted channels, ensure slots are centered to allow flexible attachment of the tray . For prefabrication, consider cutting multiple pieces in a shop environment to save time .
3. Install Threaded Rods Secure threaded rods to the ceiling or structural beams. Use appropriate anchors or fasteners for the building material. Ensure rods are vertical and aligned with the planned support points .
4. Assemble the Trapeze Frame Attach the strut channels horizontally to the threaded rods using nuts and washers. The trapeze frame should form a stable “H” or “U” shape, with the cable tray resting on the horizontal strut .
5. Mount the Cable Tray Place the trapezoidal cable tray onto the strut channels. Use clamps or brackets to secure the tray to the strut, ensuring it is level and properly supported along its length .
6. Check Alignment and Load Verify that the tray is level and that the trapeze supports can handle the expected cable load. Adjust nuts and brackets as needed. For heavy or long runs, consider additional supports or a stronger strut system .

Tips for Efficiency and Safety

• Prefabricate supports in a shop to reduce installation time on-site .
• Use lighter rails where possible to ease handling and reduce risk of injury .
• Ensure compliance with local electrical and structural codes, especially in seismic areas .
• Consider environmental factors such as corrosion; powder-coated or FRP materials may be used in harsh conditions . By following these steps, you can create a secure, adjustable, and code-compliant trapeze support system for trapezoidal cable trays, ensuring safe and efficient cable management.