How to bend a cable tray

Bending a cable tray requires careful measurement, proper tools, and techniques such as cold bending, heat-assisted forming, or relief cuts to maintain structural integrity and comply with installation standards.Step 1: Planning and Measurement

Before bending, measure the tray width, material thickness, and desired bend angle. Mark the centerline of the bend on both edges to ensure symmetry. For precise angles like 45° or 90°, plan the number of segments needed—typically, a 45° elbow uses two segments, and a 90° elbow uses three segments for metal trays . Always consider the minimum bend radius to prevent cable damage .

Step 2: Preparing Tools and Safety

Essential tools include:

• Fine-toothed saw or PVC-rated cutting blade
• Deburring file or utility knife
• Heat gun (for PVC or heat-assisted bending)
• Straightedge, square, and clamps
• Safety glasses and gloves

Step 3: Cutting and Relief (for PVC)

For PVC trays, cut short relief slots along the inner flange of the bend to allow compression without cracking. Keep the outer flange continuous for strength. For mitered elbows, cut opposing 45° ends and prepare to bond or fasten them into a corner .

Step 4: Forming the Bend

• Cold bending: Slowly bend thin, flexible trays along the marked centerline using a form block or corner edge. Clamp progressively from the center outward to avoid kinks .
• Heat-assisted bending: Apply heat evenly to the outer surface until pliable, then bend to the required angle and hold in a jig or clamp until cooled .
• For metal trays, use a bending brake or hand tools, ensuring the bend is gradual to prevent deformation .

Step 5: Reinforcing and Finishing

• File and deburr all edges after cutting or bending.
• Reinforce the inner side of the bend with bonded strips or mechanical fasteners if necessary.
• For mitered joints, use PVC-compatible adhesive or brackets to secure alignment.
• Verify the bend angle with a square and ensure the bend radius meets cable manufacturer recommendations to prevent damage .

Step 6: Installation

After bending, install the tray and cables, maintaining proper spacing and fill limits according to local codes. Avoid overfilling, and ensure the tray supports the cables without sagging . By following these steps, you can create precise, safe bends in both PVC and metal cable trays while maintaining compliance with installation standards and protecting the cables.