Requirements for the spacing of rivets on cable trays

Rivets on cable trays should be spaced to maintain structural integrity, typically following the tray manufacturer's support spacing guidelines, which range from 1.5 to 3 meters for horizontal runs and 6 to 10 feet for standard trays.General GuidelinesRivet spacing depends on the type of cable tray, load, and installation orientation. For horizontal runs, supports (and rivets securing the tray) are generally placed every 1.5 to 3 meters to prevent sagging and allow maintenance access, while vertical or angled runs may require closer spacing to secure cables and reduce mechanical stress . Heavy-duty or long-span trays can extend support spacing up to 20 feet, but this must be verified against the manufacturer's load capacity chart .Specific ConsiderationsVertical or angled runs: Cables should be fastened to transverse members of the tray to prevent movement. Rivets or fasteners should be placed at intervals that maintain cable stability, especially at bends or transitions .Rung or perforated trays: For wire-mesh or ladder-type trays, a rung spacing of 150–230 mm (6–9 inches) is recommended to support instrumentation or control cables and maintain proper bend radius .Strain relief: For long vertical runs exceeding 32 meters, strain relief sections should be incorporated, which may affect rivet placement. Typically, one fixing is offset per strain relief section to reduce tension on the cables .Environmental factors: Corrosion, vibration, and mechanical loads may require closer rivet spacing or additional fasteners, especially in industrial or outdoor environments .Best PracticesAlways follow the tray manufacturer's instructions for support and fastener spacing.Ensure rivets are compatible with the tray material (e.g., steel, stainless steel, or aluminum) to prevent galvanic corrosion .At bends, transitions, or where cables enter equipment, rivets should be placed to provide strain relief and maintain cable integrity .Maintain minimum vertical clearance of 150 mm between trays to allow airflow, heat dissipation, and future expansion . By adhering to these spacing requirements, rivets will provide adequate mechanical support, prevent sagging, and ensure the long-term safety and functionality of the cable tray system.