How to handle cable tray intersections

Cable tray intersections should be handled using proper splice fittings, hardware kits, and bend supports to maintain structural integrity, cable protection, and compliance with standards.Key Principles for Intersections1. Use of Splice Plates and Hardware Kits At intersections, cable tray sections are typically joined using bolt-on splices or push-on splices. Bolt-on splices secure adjacent tray sections and can form a UL-classified electrical bond when installed over bare metal surfaces, ensuring both mechanical stability and electrical continuity. Push-on splices allow faster installation without tools in applications where bonding is not required. Flat expansion splice bars can be used to bridge small gaps or create in-line width reductions between intersecting trays . 2. Right-Angle and T-Junctions For 90-degree elbows or T-junctions, Radius Intersection 90 Brackets or pre-fabricated bend fittings are used to protect cables as they transition around corners. The sidewalls and bottom wires of the tray are often cut and folded to form a smooth elbow, minimizing stress on cables and maintaining the minimum bend radius . 3. Structural Support and Alignment Intersections must be properly supported to handle the combined load of multiple tray sections. Support brackets should be installed at or near the intersection to prevent sagging and maintain alignment. The foundation should be capable of supporting both the tray and the cables, considering environmental factors such as vibration, wind, or seismic activity . 4. Cable Protection and Routing Ensure that cables maintain the minimum bend radius as they pass through intersections. Overlapping or sharp bends can damage insulation or reduce cable lifespan. Wire basket trays with integrated sidewalls help contain high-volume bundles and prevent cables from spilling over at intersections . 5. Material and Finish Considerations The choice of tray material (steel, aluminum, or fiberglass) and finish (powder coat, electro-zinc, or stainless steel) affects corrosion resistance and mechanical strength at intersections. Proper selection ensures long-term durability, especially in industrial or outdoor environments . 6. Compliance and Safety All intersection installations should comply with relevant standards (UL, NEMA, IEC) and manufacturer guidelines. Proper installation prevents overheating, fire hazards, and mechanical failure, ensuring safe and reliable operation of the electrical system .SummaryHandling cable tray intersections effectively requires mechanical splices, bend fittings, proper support, and careful cable routing. Using the correct hardware and following manufacturer and industry standards ensures structural integrity, cable protection, and operational safety. Proper planning and installation at intersections also facilitate future maintenance and system expansion.