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Spacing of angle irons for cable tray supports

Typical cable tray support spacing ranges from 6 to 20 feet depending on tray type, load, and installation conditions, with closer spacing required for short spans and heavier loads.General Guidelines
  • Short Span Trays: Typically supported every 6 to 8 feet. These are often used for non-industrial indoor installations where cable loads are moderate .
  • Intermediate Span Trays: Supported every 10 to 12 feet, suitable for standard industrial or commercial applications .
  • Long Span Trays: Supported every 14 to 20 feet, with 20 feet being common for outdoor or heavy-duty installations .
  • Extra-Long Span Trays: Can exceed 20 feet, often used outdoors to cross roads or reduce the number of expensive supports .
Factors Affecting Support Spacing
  1. Tray Type: Ladder, ventilated, or solid-bottom trays have different load capacities. Ladder trays with wide rungs may allow longer spans, while solid-bottom trays may require closer supports to prevent sagging .
  2. Cable Load: Heavier power cables or large bundles require shorter support intervals to prevent excessive deflection or mechanical strain .
  3. Environmental Conditions: Outdoor installations, exposure to wind, snow, or vibration may necessitate closer support spacing .
  4. Tray Length and Splice Plates: Support spacing should align with tray lengths and splice plate locations. Ideally, only one splice plate should be placed between supports to maintain structural integrity .
  5. Changes in Direction or Elevation: Horizontal or vertical bends, T-pieces, and height changes must be supported immediately near joints, typically within 150 mm of the connection .
Installation Best Practices
  • Use fire-resistant supports for all cable types to ensure compliance with safety standards .
  • Ensure supports are aligned with the tray's load rating and do not exceed the manufacturer's maximum permissible span .
  • For angle iron supports, attach the tray securely using bolts or brackets, and consider stiffening the back of the support if required for longer spans .
  • Always consult the cable tray manufacturer for specific recommendations, especially when modifying rung spacing or using non-standard tray configurations . By following these guidelines, cable trays can be safely supported, minimizing mechanical strain on cables and ensuring compliance with electrical installation standards.
Spacing of angle irons for cable tray supports

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