Installation Method for Trapezoidal Cable Tray Bends

Trapezoidal cable tray bends should be installed using proper fittings, secure support, and alignment to maintain cable integrity and system safety.

Preparation and Planning

Before installation, review the layout plan to determine the location and type of bends required, whether horizontal or vertical. Ensure that the support structure is designed to handle the load of the tray and cables, with maximum support spacing typically around 3.6 meters for center-hung trays and load capacities between 318 kg to 340 kg per hanger (Unitray guide) . Verify compliance with local electrical codes and standards such as DIN EN 61537 or BS EN 61537 for cable support systems .

Selecting and Positioning Bends

Trapezoidal bends are used to change the direction or elevation of the cable tray. Use pre-fabricated bends or fabricate on-site if necessary, ensuring the bend radius meets the minimum requirements for the cables to prevent damage . Horizontal bends should maintain smooth transitions to avoid sharp angles, while vertical bends should be supported to prevent sagging.

Installation Steps

1. Attach the Bend to the Tray: Align the bend with the main tray section and secure using the manufacturer-recommended connectors or fasteners. Ensure the bend is flush and level with the adjoining tray sections .
2. Support the Bend: Install hangers or brackets at appropriate intervals, typically at each end of the bend and at intermediate points if the bend is long or carries heavy cables .
3. Check Alignment: Ensure the bend maintains the correct horizontal or vertical alignment and that the tray remains level or follows the designed slope.
4. Secure Cables: Once the bend is installed, lay the cables carefully, maintaining the minimum bend radius to prevent stress or insulation damage. Use cable ties or clamps as needed to keep cables in place .

Final Checks

• Verify that all fasteners are tight and that the bend is structurally supported.
• Ensure that the installation allows for future cable additions or maintenance.
• Confirm that the bend does not create sharp edges or pinch points that could damage cables .

Best Practices

• Use ventilated or solid-bottom trays depending on heat dissipation requirements .
• Avoid using bends as walkways or supports for personnel to prevent injury and system damage .
• Document the installation for maintenance and inspection purposes. By following these steps, trapezoidal cable tray bends can be installed safely, maintaining cable integrity and compliance with industry standards.