Cable trays can accommodate both standard right angles and custom bends using pre-fabricated fittings or field-fabricated sections, with attention to minimum bend radius and support requirements.

Standard Bends and Angles

Cable tray systems typically offer pre-fabricated bends for common angles such as 30°, 45°, 60°, and 90° in both horizontal and vertical planes . These bends are designed to maintain cable integrity and facilitate smooth cable pulling. Adjustable elbows are available when standard angles do not fit the installation layout, allowing flexibility in routing .

Minimum Bend Radius

The bend radius is a critical factor to prevent cable damage. Typical pre-fabricated bends have radii of 12", 24", 36", or 48", with 24" being common . The selection of radius depends on available space, the minimum bending radius of the cables, ease of cable pulling, and cost considerations . While the NEC does not specify a minimum radius for cable trays, manufacturers may provide guidelines to ensure safe installation .

Field Fabrication

Field bends can be created by cutting straight tray sections and bolting them together. This method is allowed under NEC 392.18(A), but care must be taken to avoid sharp corners that could damage cables during pulling . For complex or numerous bends, specialized systems like SnakeTray can be used to accommodate arbitrary routing with minimal stress on cables .

Support and Installation Considerations

Bends, especially sharp or custom ones, may require additional supports to maintain mechanical stability . Supports should be placed according to CSA/NEMA VE2 guidelines or manufacturer recommendations. Proper support ensures that the tray can handle the weight of cables and prevents sagging or deformation at bends .

Summary

• Use pre-fabricated bends for standard angles whenever possible.
• Ensure the bend radius meets cable manufacturer recommendations.
• Field-fabricated bends are permissible but must avoid sharp corners.
• Additional supports may be required at bends to maintain structural integrity.
• Adjustable elbows or flexible systems can handle arbitrary routing in complex installations. Following these practices ensures safe, efficient, and code-compliant cable tray installations while accommodating both right angles and custom bends .