Can cable trays be made at a 90-degree angle

Cable trays can be made at a 90-degree angle using fabricated elbows, typically by combining two 45-degree cuts or multiple smaller-angle cuts to form a smooth bend.Methods for Creating a 90-Degree Bend

Fabricated or mitered elbows are the most common approach. This involves cutting, bending, and fastening a straight section of tray:

1. Mark the Center Line: Determine the desired bend location and draw a line across the tray base to guide the cut.
2. Cut the Side Channels: Make two 45-degree cuts on the tray flanges, or multiple smaller-angle cuts if a smoother curve is needed. The V-shaped sections on the base are removed to allow the sides to meet when bent.
3. Bend the Tray: Close the V-cuts to form the 90-degree angle, ensuring the cut sides align perfectly.
4. Secure the Joint: Drill holes and fasten with bolts, nuts, or connecting plates for rigidity.
5. Finish the Surface: Apply protective coatings, such as cold galvanizing spray, to prevent corrosion .

Alternative Approach Using Pre-Fabricated Elbows

Manufacturers often provide standard 90-degree horizontal or vertical elbows with specified centerline radii. Using these pre-fabricated components ensures compliance with cable bend radius requirements, especially for power or fiber cables, and reduces field labor .

Calculating Cut Sizes for Custom Bends

For custom bends, the size of the cut-out section depends on the tray width and the desired angle. For example, a 600 mm wide tray can be bent into a 90-degree angle using two 45-degree cuts, or three 30-degree cuts for a smoother curve. The formula involves dividing the tray width by the number of angle segments to determine the cut length .

Key Considerations

• Bend Radius: Ensure the bend radius meets the minimum requirement for the cables being installed to prevent damage. For heavy power cables, the radius should be at least 12 times the cable diameter .
• Alignment and Stability: Use a protractor or square to verify the angle and secure the joint properly to maintain structural integrity .
• Material Protection: Apply rust protection to exposed metal after cutting and bending . By following these methods, a 90-degree cable tray bend can be safely and accurately constructed, either through field fabrication or by using pre-fabricated elbows.