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Cable tray support arm dimensions

Cable tray support arm dimensions

Cable tray support arm dimensions - MADIBA BAY OPTICS

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Cable tray support arms, including cantilever brackets, are designed to provide horizontal support for trays and ladders, with dimensions and configurations varying by load, tray type, and installation requirements.

Types of Support Arms

Cantilever Arms: These are the most common support arms for cable trays, providing horizontal support from a wall or vertical structure. They can be configured with:

  • Single-bolt fixing for quick installation with open-face trays at the top .
  • Two-bolt fixing for added stability, usable with open-face trays on the top, bottom, left, or right .
  • Two-bolt fixing with extra support for heavy loads or longer horizontal runs . Other specialist brackets exist for unique applications, such as supporting instrumentation cables or providing extra lateral stability.

Typical Dimensions and Materials

While exact dimensions vary by manufacturer and load requirements, standard cantilever arms and channel supports generally follow these guidelines:

  • Length: Commonly designed to match the width of the cable tray plus clearance, typically ranging from 300 mm to 600 mm for light to medium loads .
  • Material Thickness: Channels and arms are often made from 2.5 mm mild steel or equivalent, with hot-dipped galvanization or other protective finishes .
  • Channel Size: Standard channel sections are available in 3 m or 6 m lengths, with continuous slots for adjustable fixing .
  • Weight: Approximately 3 kg per meter for standard steel channels .

Installation Considerations

  • Support arms should be spaced according to tray load and length; heavier or longer trays require closer spacing.
  • Ensure compatibility with tray type (ladder, perforated, or solid-bottom) and orientation (top, bottom, left, right).
  • Use manufacturer-recommended bolts and spring nuts to engage the inturned edges of the channel for secure attachment .
  • Cantilever arms are not designed to support personnel; they are strictly for cable support .

Summary

Cable tray support arms are engineered to provide reliable horizontal support for cable trays and ladders. Cantilever arms are versatile, with single or double-bolt configurations, variable lengths, and standard steel thicknesses. Proper selection depends on tray width, load, and installation environment, ensuring compliance with structural and safety requirements .

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