Cable Tray Bending Operation Flowchart

The cable tray bending sequence involves planning the route, selecting the bend type, measuring and marking, cutting if necessary, and forming the bend while ensuring compliance with standards and safety.

Step-by-

Step Bending Sequence1. Planning and Layout Before bending, survey the installation area and review approved drawings to determine the tray route, bend locations, and clearance requirements. Identify any obstacles, vertical or horizontal offsets, and the type of bend needed (90°, 45°, vertical, or custom angles) to ensure smooth cable routing and compliance with NEC, IEC, or NEMA standards.

2. Selecting Bend Type and Tools Choose the appropriate bend configuration: standard horizontal or vertical elbows, double-elbow offsets, or custom bends. Use proper tools such as a cable tray bender, bolt cutter (for wire mesh trays), or hydraulic bending equipment.

Ensure the tool matches the tray type (ladder, solid bottom, or wire mesh) and width. 3. Measuring and Marking Measure the centerline radius (CLR) of the bend and mark the tray at the bend location.

For offsets, calculate the lateral shift and straight run between bends. Include the thickest cable diameter to maintain the minimum bend radius and avoid cable damage. 4.

Cutting and Preparing the Tray If a cut is required, use a bolt cutter or saw suitable for the tray material. For wire mesh trays, the cut end forms a protective zinc layer, and rubber caps can be applied to prevent injury or cable damage. Ensure all cut edges are smooth and protected.

5. Forming the Bend Bend the tray gradually along the marked line using the selected tool. For ladder trays, apply even pressure to avoid deformation.

Check the bend angle frequently to match the planned route. For double-elbow offsets, bend each section sequentially, maintaining the correct setback distance. 6.

Installing and Securing After bending, position the tray in place and secure it with supports, brackets, or hangers. Verify alignment, clearance, and slope for drainage if required. Ensure all bends maintain the minimum radius to prevent cable stress and comply with manufacturer and standard recommendations.

7. Final Inspection Inspect the entire tray run for proper bend angles, secure connections, and adherence to safety standards. Confirm that cables can be pulled without obstruction and that the installation meets electrical and mechanical requirements.

Following this sequence ensures safe, precise, and compliant cable tray installations, minimizing the risk of cable damage and maintaining structural integrity.