How to connect cable tray bolts

Cable tray bolts are connected by aligning tray sections, inserting truss-head bolts through the fittings or splice plates, and securing them with combination nuts to ensure a strong, stable joint.

Step-by-Step Guide

1. Prepare the Cable Trays and Fittings Ensure the cable trays are clean, free of debris, and properly aligned. Use the appropriate fittings such as straight connectors, splice plates, or angle plates depending on the tray configuration . For trays wider than 400 mm, a joint plate is recommended to prevent transverse bending . 2. Align the Tray Sections Place the ends of the two tray sections together, ensuring they are level and properly aligned. Misalignment can cause sagging or stress on the bolts . 3. Insert the Bolts Use FRS truss-head bolts or the manufacturer-recommended bolts. Insert the bolts through the holes in the tray fittings or splice plates. Typically, bolts are inserted from the outside of the tray toward the inside to allow easy access for the nuts . 4. Attach Combination Nuts Thread the combination nuts onto the bolts. Hand-tighten initially to hold the trays in place. Ensure that all bolts are inserted and nuts are in place before final tightening . 5. Tighten the Bolts Use a spanner or torque wrench to tighten the bolts securely. Do not overtighten, as this may damage the tray or fittings. Proper torque ensures the connection is strong enough to support the cable load without loosening over time . 6. Check Alignment and Stability After tightening, verify that the trays are level and the joint is stable. Adjust if necessary. For long runs, ensure supports are spaced correctly (typically 1.5 to 3 meters apart) to prevent sagging . 7. Optional: Install Covers or Additional Supports If using tray covers, attach them according to the manufacturer's instructions, either with pre-mounted turn buckles or additional fasteners . Ensure that all components are secure and that the system meets load and safety requirements.

Tips and Best Practices

• Always follow the manufacturer's instructions and local electrical codes .
• Use the correct bolt type and size for your tray system. Truss-head bolts with combination nuts are standard for most screw-on systems .
• For angled or T-shaped connections, use the appropriate angle or T-piece fittings with bolts as specified .
• Inspect connections periodically to ensure bolts remain tight and the tray system is stable. By following these steps, you can ensure a secure, durable, and safe cable tray installation that supports the intended cable load and allows for easy maintenance or future modifications.