Distance of cable tray support

The typical distance between cable tray supports ranges from 1.5 to 3 meters for horizontal runs, with adjustments based on tray type, load, and installation method.Horizontal Cable Tray RunsFor straight horizontal sections, the support span—the distance between supports—generally ranges from 1.5 meters to 3 meters depending on the tray type and cable load . Ladder trays, which have rungs for cable support, may allow longer spans, while ventilated troughs or heavy-duty trays may require shorter spans to prevent sagging . At corners or bends, supports should be installed on each side symmetrically, typically not exceeding 1.5 meters between hangers .Vertical and Angled RunsVertical cable tray runs should be supported at intervals preferably less than 2 meters to maintain stability and prevent undue mechanical stress on the cables . Cables should also be fastened to the tray's transverse members to avoid sagging or strain. For angled runs, supports should follow the same principles as vertical runs, ensuring secure attachment to the building structure.Load ConsiderationsThe maximum allowable span depends on the total weight of the cables and the tray's load rating. Heavier loads or long-span trays may require supports every 6 to 10 feet (1.8–3 meters) for standard trays, and up to 20 feet (6 meters) for heavy-duty trays, according to NEC 392 . Shorter spans reduce deflection and increase load capacity, while longer spans are possible if the load per meter is lower .Key Support PointsFixed supports are critical at:Tray beginnings and endsCorners and T-junctionsSpans exceeding 30 metersTransition points to equipment or other raceways Additional GuidelinesHanging rods should have a minimum diameter of 8 mm .Horizontal spacing between power and signal trays should be at least 0.5 meters, or 0.3 meters if shielded .Vertical clearance between stacked trays should be at least 150 mm to allow ventilation and maintenance .Always consult the manufacturer's load capacity chart to determine exact support spacing for your specific tray and cable load .By following these guidelines, cable trays will remain structurally sound, minimize sagging, and allow safe access for maintenance and future cable additions.