Cable tray support arm process

The cable tray support arm process involves selecting appropriate support elements, positioning them according to load and layout requirements, and securely fastening the cable tray to the structure to ensure stability and compliance with standards.

Overview of Cable Tray Support Systems

Cable tray support systems are designed to mechanically support cable trays, ladders, and trunkings while accommodating electrical and communication cables safely . Support arms, brackets, and hangers are used to connect the tray to ceilings, walls, floors, or steel structures. These systems must withstand environmental conditions, mechanical loads, and forces generated by the cables themselves, including short-circuit forces .

Steps in the Support Arm Process

1. Planning and Layout
   • Determine the cable tray route, including horizontal and vertical bends, T-pieces, and crossovers .
   • Identify load points and spacing for support arms based on tray type, cable weight, and applicable standards (BS EN 61537, BS 6946), .
2. Selection of Support Arms
   • Choose support arms or brackets compatible with the tray type (perforated tray, ladder, or mesh tray), .
   • Consider material (steel, stainless steel) and finish (pre-galvanized, hot-dip galvanized) for corrosion protection .
   • For sway control, angled or Y-hook supports may be used, especially for wire basket trays .
3. Mounting the Support Arms
   • Attach support arms to the structural surface using appropriate anchors or bolts (e.g., M10, M12, M16 for concrete or C-channel frames), .
   • Ensure the arms are level and aligned with the planned tray route.
   • Maintain recommended spacing between supports to prevent sagging and ensure load distribution .
4. Installing the Cable Tray
   • Lift the tray and place it onto the support arms, securing it with bolts, clamps, or hooks as specified by the manufacturer .
   • For wire basket trays, hooks may loop through perforations or around side rails to prevent sway .
   • Check that the tray is stable and properly aligned before loading cables.
5. Final Checks and Compliance
   • Verify that the installation meets mechanical load requirements, environmental conditions, and safety standards .
   • Ensure that the tray is not used as a walkway or ladder, as this can compromise safety and system integrity .
   • Add accessories such as covers, barrier strips, or cable protection rings if required .

Best Practices

• Use support arms and trays from the same tested system to ensure compatibility and safety .
• Consider future cable additions and allow for expansion in the support layout.
• Regularly inspect support arms and trays for corrosion, loose fasteners, or deformation.
• Follow manufacturer guidelines for maximum load and spacing to prevent structural failure . By following these steps, the cable tray support arm process ensures a safe, durable, and compliant installation that protects both the cables and the supporting structure.