Manufacturing methods for various bends in cable trays

Cable tray bends can be fabricated using manual benders, press brakes, crimping tools, or pre-manufactured fittings, ensuring proper alignment, structural integrity, and cable support.

Common Bends and Fabrication Techniques

1. Right-Angle (90°) Bends

• Internal bends: Mark the tray section, cut if necessary, and use a manual bender or press brake to form the curve gradually, ensuring uniform bending to maintain tray integrity and cable support .
• External bends: Similar process, but the tray is bent outward; care must be taken to avoid deformation of the tray sides. Pre-manufactured 90° elbows can also be used for efficiency . 2. Tees and Crosses
• Fabricate by cutting the main tray and branch sections to size, then bending edges to form the junction. Use crimping tools or welding for secure connections .
• Ensure alignment so that cables can be routed smoothly without sharp turns that could damage insulation . 3. Riser Bends (Vertical Transitions)
• Use a press brake or manual bender to gradually form vertical bends. Maintain the minimum bend radius recommended for the cable type to prevent stress on the conductors .
• Riser bends are often used to transition between floors or levels in industrial installations. 4. Reducers and Expansions
• When changing tray width, cut and bend the tray edges to taper gradually. Crimping or welding may be required to maintain structural strength .
• Ensure the reducer maintains proper support for cables and does not create pinch points.

Tools and Equipment

• Manual benders: Suitable for small to medium bends and on-site adjustments .
• Press brakes: Provide precise, uniform bends for larger or thicker trays .
• Crimping tools: Used to secure bends and joints, especially in wire mesh or ladder trays .
• Metal bars or improvised levers: Can be used for emergency or temporary bends when specialized tools are unavailable .

Best Practices

• Always mark bend locations clearly before cutting or bending.
• Maintain uniform bend radius to prevent tray deformation and ensure cable support.
• Consider material properties: steel, aluminum, and stainless steel trays have different bending tolerances and corrosion resistance .
• Follow safety guidelines and wear protective equipment during fabrication. By combining these methods, all types of bends—internal, external, tees, crosses, risers, and reducers—can be fabricated efficiently while maintaining the structural integrity and functionality of the cable tray system .