Vertical bends on cable trays must be installed with proper support, correct bend radius, and adherence to electrical codes to ensure safety and cable integrity.

Key Considerations

1. Compliance with Standards Vertical bends must comply with the National Electrical Code (NEC), Canadian Electrical Code (CEC), and relevant NEMA standards (e.g., NEMA VE 1, VE 2, FG 1) to ensure safe installation and grounding . Qualified personnel should perform the installation, familiar with electrical construction and hazards . 2. Bend Radius and Cable Protection Maintain the minimum bend radius for cables exiting the tray to prevent damage and signal interference . For wire basket trays, ensure that the bend does not pinch or compress cables, and use smooth, rounded bends rather than sharp angles . 3. Support Requirements

• Top of the bend: Vertical bends require support at the top to prevent sagging or stress on cables .
• Spacing: Larger transitions (e.g., 3 ft or more) need additional supports along the bend .
• Trapeze or swing supports: Commonly used for vertical runs, with threaded rods, washers, and cross members adjusted to ensure level and secure attachment . 4. Cutting and Assembly
• Use side-action angle cutting tools to trim tray sections for bends .
• Remove sharp edges to prevent cable damage.
• For corner or vertical bends, splice kits or no-splice supports may be required to join sections securely .
• Bolt heads should be positioned inside the tray to protect cables . 5. Grounding and Bonding Ensure proper bonding of tray sections using UL-classified splice kits or approved grounding conductors, especially for painted or non-UL-classified trays . This maintains electrical continuity and safety. 6. Material and Environmental Considerations Select tray material (steel, aluminum, stainless steel) based on environmental conditions, corrosion resistance, and mechanical strength . Aluminum and stainless steel are preferred in corrosive environments, while steel may be used in standard indoor installations.

Installation Steps Summary

1. Plan the vertical bend layout according to cable routing and clearances.
2. Cut tray sections to fit the bend using proper tools, removing sharp edges.
3. Install supports at the top and along the vertical bend, ensuring level alignment.
4. Assemble tray sections using splice kits or clamps, securing bolts inside the tray.
5. Verify minimum bend radius and cable spacing to prevent stress.
6. Bond and ground the tray system according to NEC/CEC requirements.
7. Inspect the installation for alignment, support spacing, and cable protection before energizing. Following these guidelines ensures safe, code-compliant, and durable installation of vertical bends in cable tray systems, protecting both the cables and personnel.