Making fiberglass cable tray bends

Fiberglass cable tray bends can be made using prefabricated adjustable elbows or by carefully fabricating bends on-site while maintaining proper bend radius and cable protection.

Prefabricated Bends

For most installations, prefabricated fiberglass (FRP) bends are recommended. These come in horizontal or vertical configurations and are available in standard angles like 30°, 60°, and 90°, or can be custom-engineered to meet project requirements. Prefabricated bends offer several advantages: Cable Protection: Smooth, controlled bend radius prevents kinking and stress on conductors.

Corrosion Resistance: Made from the same high-grade fiberglass as straight trays, ensuring uniform durability. Time Efficiency: Ready to install with splice plates, reducing on-site labor. Compliance: Maintains proper bend radius to meet electrical standards and avoid sharp edges.

On-

Site Fabrication

If prefabricated bends are not available, on-site fabrication is possible with careful planning: Mark the Tray: Identify the bend location and measure the required bend radius. Prepare the Tray Lip: Remove part of the tray lip (typically 2¾ of the tray width, split evenly on both sides) using a hand grinder or file. Cut the Center Line: Carefully cut along the center line without letting the tray fall open.

Flatten the Lip: Use a blunt object to flatten the tray lip at the bend point. Bend and Bolt: Bend the tray to the desired angle (e.g., 90°) and secure the two parts together with bolts. Add Gussets: Measure the internal edge distance and fabricate a gusset from tray material to reinforce the bend.

Adjustable Bends

Some FR

P systems offer horizontal adjustable bends (HAB) that allow fine-tuning of the angle on-site. These are particularly useful for complex routing or when exact angles are not predetermined. They maintain a smooth curve and protect cable insulation while providing flexibility during installation.

Safety and Best Practices

Always wear protective equipment when cutting or grinding fiberglass. Maintain the minimum bend radius recommended for the cable type to prevent conductor damage. Use splice plates or gussets to reinforce bends and maintain structural integrity.

Consider U

V and fire resistance if the installation is exposed to sunlight or requires Class 1 fire retardancy. By combining prefabricated bends, adjustable elbows, and careful on-site fabrication, fiberglass cable tray systems can be routed efficiently while ensuring cable safety, structural strength, and compliance with electrical standards.