Laying out the inner bend of the cable tray bend

To lay out the inner bend of a cable tray, mark the bend line, determine the correct bending radius, and use appropriate tools to gradually form the internal curve without damaging the tray or cables.Step-by-Step Guide

1. Determine the Bend Angle and Radius

• Identify the required bend angle, commonly 90° for internal corners.
• Check the cable tray manufacturer's specifications for the minimum bending radius, which ensures cables will not be stressed or damaged during installation . 2. Mark the Bend Line
• Measure and mark the inner edge of the tray where the bend will start.
• Use a straight edge or template to ensure accuracy. For multi-layer trays, mark each layer consistently . 3. Prepare the Tray for Bending
• For steel or wire mesh trays, you can use a bending machine, a metal bar, or a bolt cutter for wire mesh trays to create live bends on-site .
• Ensure the tray is supported on a flat surface to prevent deformation. 4. Form the Inner Bend
• Gradually lift and bend the tray along the marked line, keeping the inner radius smooth. Avoid sharp kinks that could damage cables or reduce structural integrity .
• For wire mesh trays, bend each side evenly to maintain alignment and spacing. Rubber caps or protective coatings can prevent damage to cut or bent edges . 5. Check Alignment and Fit
• After bending, verify that the tray aligns with the intended path and that the bend allows sufficient space for cable installation.
• Adjust slightly if necessary, ensuring the bend radius meets the minimum requirement for the cables being installed . 6. Safety and Best Practices
• Always wear protective gloves and eye protection when bending metal trays.
• Avoid using excessive force, which can deform the tray or compromise its load-bearing capacity.
• Follow manufacturer guidelines and standards such as BS EN 61537 for cable tray systems . By following these steps, you can create a precise and safe inner bend in a cable tray, ensuring proper cable support and long-term reliability.