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The bend in the cable tray going up and then forward

The bend in the cable tray going up and then forward

The bend in the cable tray going up and then forward - MADIBA BAY OPTICS

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A cable tray bend that goes up and then forward is typically achieved using a vertical riser bend followed by a horizontal bend, either with pre-manufactured fittings or field-fabricated from straight tray sections.

Methods to Create the Bend

1. Pre-Manufactured Riser and Horizontal Bends

  • Adjustable riser bends allow smooth directional changes from vertical to horizontal. For example, a 300mm variable riser bend can adjust between 90° and 360°, providing flexibility for both inside and outside riser applications while maintaining structural integrity and corrosion resistance .
  • Horizontal 90° bends can be used after the riser to continue the tray forward, ensuring a smooth cable path. 2. Field Fabrication
  • Wire mesh or metallic ladder trays can be bent on-site using simple tools like bolt cutters, pliers, and a metal bar .
  • For wire mesh trays, vertical bends are made by cutting and carefully bending the tray upward, then creating a horizontal bend to continue forward. Rubber caps or protective coatings can be applied to cut ends to maintain safety and prevent cable damage .
  • For metallic ladder trays, field bends are possible according to NEC 392.18(A), but care must be taken to maintain a minimum bend radius to avoid sharp angles that could damage cables .

Key Considerations

  • Minimum Bend Radius: While NEC does not specify a strict minimum for cable trays, manufacturers often provide recommended radii to prevent cable stress .
  • Smooth Transition: Ensure the bend is gradual to avoid kinking or excessive stress on cables. Adjustable riser bends or multiple small-angle bends can help achieve this.
  • Safety: Always wear gloves and eye protection when cutting or bending trays. Ensure the tray is properly supported during bending to prevent deformation.
  • Cable Pulling: After bending, verify that cables can be pulled through without obstruction. Sharp or abrupt bends can make installation difficult and may damage insulation.

Summary

To create a cable tray bend that goes up and then forward, you can either use pre-manufactured adjustable riser and horizontal bends for precision and speed, or fabricate the bends on-site using standard tools while following manufacturer guidelines for minimum radius and safety. Proper planning ensures smooth cable routing, structural integrity, and compliance with electrical standards.

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