Cable tray reversal connection method

A cable tray reversing connection involves securely joining two tray sections in opposite or reversed orientations using appropriate fittings, fasteners, and grounding measures.Mechanical ConnectionWhen connecting cable trays in a reversed configuration, the following steps are recommended:Alignment: Ensure the ends of the two tray sections are properly aligned. Misalignment can cause stress on cables and compromise structural integrity .Butt Joints and Fittings: Use a butt joint or splice plate to join the tray sections. For bends or reversed connections, T-pieces, cross-overs, or elbow fittings may be required to maintain the correct routing path .Fastening: Secure the trays using mushroom head steel bolts or standardized connectors. The connection must be mechanically strong to prevent relative movement between sections .Support: Maintain proper support spacing, typically not exceeding 1.5 meters, and ensure trays are supported near bends or intersections to prevent sagging .Electrical and Grounding ConsiderationsBonding: All tray sections must be electrically bonded to ensure continuity. Use grounding conductors or bonding jumpers where trays are joined, especially at expansion joints or reversed connections .Material Considerations: Aluminum trays should not be used as grounding conductors for circuits above 600 A. Ensure the tray material and fasteners are compatible with the grounding requirements .Cable ProtectionEdge Treatment: Cut edges should be de-burred and treated with cold galvanized paint to prevent cable damage .Cable Entry: Holes for cable entry should be bushed or lined, and a minimum clearance of 20 mm should be maintained behind trays wherever possible .Practical TipsUse Standardized Fittings: Systems like OBO's Magic plug or screw-on trays allow faster installation and maintain compatibility across different tray types .Plan Routing: For reversed connections, plan the routing to avoid sharp bends that exceed the minimum bend radius of the cables .Inspection: Conduct pre-installation inspections to ensure all materials, supports, and fittings are correct and meet specifications . By following these mechanical, electrical, and safety guidelines, a cable tray reversing connection can be installed efficiently while maintaining structural integrity and electrical safety.