What is the optimal height for vertical shaft cable tray supports

Vertical shaft cable tray supports should be installed at intervals that ensure mechanical stability, typically every 1.5 to 3 meters, with additional support at bends, junctions, and load points.

General Guidelines

Vertical cable tray supports are designed to maintain the alignment and structural integrity of cable trays in shafts, risers, or vertical runs. The height and spacing of these supports depend on several factors, including the tray type, material, cable weight, and local building or electrical codes .

• Support Spacing: For vertical runs, supports are generally installed every 1.5 to 3 meters (5 to 10 feet). Shorter spacing may be required for heavy cable loads, long unsupported spans, or when using ladder or wire mesh trays .
• Additional Supports: Extra supports should be provided at bends, tees, or junctions, as well as at points where cables enter or exit the tray, to prevent sagging and maintain the minimum bend radius for cables .
• Material Considerations: Supports are typically made of steel, stainless steel, or aluminum, with corrosion-resistant finishes for industrial or outdoor environments . The choice of material affects the maximum allowable span and support height.
• Compliance with Standards: Installation should follow BS EN 61537, BS 6946, or the Canadian Electrical Code (CEC), which emphasize that cable trays are mechanical supports for cables, not walkways or lifting points .

Practical Installation Tips

• Ensure that vertical supports are rigidly anchored to walls, floors, or structural members to resist lateral forces and short-circuit cable forces .
• Maintain clearances from other services and allow for future cable additions.
• Use threaded rods, struts, or brackets designed for vertical applications, and verify that the support system can handle the total cable weight plus any dynamic loads .
• For long vertical shafts, consider intermediate support brackets to prevent tray deflection and maintain alignment.

Summary

While there is no single fixed "height" for vertical shaft cable tray supports, installing supports every 1.5 to 3 meters, with additional reinforcement at bends and load points, is standard practice. The exact spacing should be determined based on tray type, cable weight, environmental conditions, and applicable electrical codes to ensure safety, compliance, and long-term reliability .