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Cable trays for upper and lower bends

Cable trays for upper and lower bends

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Cable trays for upper and lower bends - MADIBA BAY OPTICS [PDF]

Cable trays for upper and lower bends - MADIBA BAY OPTICS

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Cable tray bends allow smooth directional changes in cable runs, with specific fittings for upper (vertical up) and lower (vertical down) transitions.

Types of Cable Tray Bends

1. Vertical Bends

  • Upper bends (vertical up): These are used when the cable tray needs to rise to a higher level. They are often referred to as vertical inside or outside bends, depending on whether the bend curves inward or outward relative to the tray run.
  • Lower bends (vertical down): These allow the tray to descend to a lower level. Similar to upper bends, they can be inside or outside depending on the direction of curvature.
  • Vertical bends are available in 90° or 45° angles, with adjustable options for custom angles . 2. Horizontal Bends
  • Horizontal bends are used to change the tray direction along the same plane. They can also be inside or outside bends and are available in 45° or 90° angles.
  • Radius bends are designed to maintain cable integrity by providing a smooth curve, reducing stress on cables .

Materials and Construction

  • Cable tray bends are manufactured from aluminum, galvanized steel, stainless steel, or FRP composites, matching the main tray material for structural compatibility .
  • They often include pre-drilled holes or slots for easy attachment to the main tray and for securing cables with ties or clamps .
  • Some systems, like Metsec, provide integral connectors for bends, tees, and crossovers, simplifying installation .

Installation Considerations

  • Bend radius: Ensure the bend radius is sufficient for the cable type to prevent damage. Larger cables require larger radius bends.
  • Inside vs outside bends: Inside bends curve toward the inside of the tray run, while outside bends curve outward. Choose based on space constraints and cable routing.
  • Covers: Closed or ventilated covers can be added to bends to protect cables from dust, moisture, or mechanical damage .
  • Load capacity: Verify that the bend fitting can support the weight of the cables, especially for heavy-duty ladder trays .

Accessories and Fittings

  • Standard accessories include elbows, junctions, tees, reducers, and risers to accommodate complex routing .
  • Some suppliers offer curved ladder sections specifically for vertical plane changes, which are cULus classified for safety .
  • Adjustable bends allow flexibility in installation when exact angles are not predetermined.

Summary

For upper and lower bends in cable tray systems, select the appropriate vertical inside or outside bend with the correct angle and radius. Match the material and load rating to the main tray, and consider covers and accessories for protection and secure cable management. Proper selection ensures smooth cable routing, reduces stress on cables, and maintains system safety and reliability .

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