How to make a joint for a cable tray

Cable tray joints can be made securely using splice plates, bolted connections, clamps, or quick-connect systems, depending on the tray type and installation requirements.

Key Steps for Making Cable Tray Joints

1. Prepare the Tray Ends Ensure the ends of the cable trays are clean, aligned, and free from burrs. For wire mesh trays, cut the tray using a bolt cutter and protect the cut ends with rubber caps to prevent damage to cables and maintain corrosion protection . 2. Choose the Connection Method

• Splice Plates: Flat metal plates with pre-drilled holes are bolted to the ends of two tray sections. This method is strong, reliable, and works with most tray types, though it requires tools like spanners or torque wrenches .
• Bolted Connections: Use nuts, bolts, and washers to secure splice plates or other fittings. This allows for a tight hold and can be undone for future adjustments .
• Quick-Connect Systems: Snap, slide, or twist systems allow fast installation with minimal tools, ideal for large projects or when using a single manufacturer's trays .
• Clamps or Fish Plates: Used for angled or T-joint connections, providing flexibility for routing cables around corners or junctions . 3. Align and Secure the Trays Position the tray sections so they are level and aligned. Attach the splice plates or fittings, then tighten all bolts or clamps to ensure a firm connection. For T-joints or cross-joints, use the appropriate L, T, or cross-shaped plates . 4. Support and Safety Install adequate supports such as GI threaded rods and slotted channels to prevent stress on the trays and cables. Ensure sufficient space around the trays for maintenance and cable installation . For trays passing through walls or partitions, use non-combustible covers for protection . 5. Final Checks Verify that all joints are secure, level, and properly aligned. Check that the system meets local electrical codes and manufacturer specifications. Ensure grounding continuity if required.

Tips for Efficient Installation

• Pre-plan the tray layout and mark paths according to approved shop drawings .
• Use the correct size of bolts and nuts for the tray type and load.
• For wire mesh trays, ensure protective zinc layers remain intact after cutting .
• Quick-connect systems can save labor time but may be brand-specific . By following these steps, cable tray joints will be safe, stable, and durable, allowing for easy maintenance and long-term performance .