Method for laying out cable tray bends

Cable tray bends can be fabricated on-site using cutting, bending, and joining techniques to create smooth directional changes while maintaining structural integrity.

Key Methods for Fabricating Cable Tray Bends

1. Planning and Marking

• Determine the required bend angle (commonly 45° or 90°) and the radius of the bend based on cable routing needs .
• Mark the centerline and side edges of the tray on the flat sheet or wire mesh section.
• Divide the bend into equal segments to ensure a smooth curve. 2. Cutting the Tray
• For wire mesh trays, use a bolt cutter to cut the tray at designated points; this forms bends without compromising protective coatings, and rubber caps can protect cut ends .
• For perforated or solid metal trays, cut triangular or rectangular sections along the side walls to allow folding and bending . 3. Forming the Bend
• Use a manual bender, hydraulic press brake, or hand tools to gradually bend each segment to the desired angle .
• Ensure uniform bending to maintain tray integrity and proper cable support. 4. Rejoining and Reinforcement
• After bending, rejoin cut sections using:
  • Welding for permanent, strong joints.
  • Bolts or rivets with metal strips for reinforcement if welding is not feasible .
• Ensure all joints are smooth to prevent cable damage. 5. Installation Considerations
• Fabricated bends should be installed with adequate support spacing to prevent sagging or stress on cables .
• Use insulating materials like G-10 sheets at supports to prevent electrical contact with metal structures.
• For high-voltage or heavy-duty installations, ensure proper alignment and secure fastening with high-tensile bolts and washers. 6. Safety and Quality
• Always wear protective gear when cutting or bending metal trays.
• Verify that bends do not interfere with cable routing or exceed the tray's load capacity .
• Check that protective coatings are intact after fabrication to prevent corrosion.

Summary

Cable tray bends can be fabricated on-site or in a workshop using a combination of marking, cutting, bending, and joining techniques. Wire mesh trays allow quick live bending with bolt cutters, while perforated or solid trays require careful cutting and reinforcement. Proper planning, uniform bending, and secure rejoining ensure smooth cable routing, structural integrity, and safety during installation .