Is it okay to run cables at corners on cable trays

It is acceptable to run cables at corners on cable trays, provided the cables are not bent too sharply and proper corner supports or guides are used to prevent strain or damage.

Key Considerations

Bend Radius: Cables have a minimum bend radius that must be respected to avoid damage to insulation or conductors. Sharp turns at corners can exceed this limit, so corners should be designed to allow smooth curves that maintain the cable's integrity . Corner Supports and Guides: Using special corner supports, radius elbows, or guides helps cables transition around corners without excessive stress. These accessories prevent kinking, crushing, or abrasion against tray edges . Cable Type and Tray Selection: Ensure that the cables are rated for tray installation (e.g., Type TC or metal-armored MC cables) and that the tray type (ladder, solid, or trough) suits the cable type and environmental conditions . Ladder trays are commonly used for larger or heavier cables, providing better support at corners. Securing Cables: Cables should be tied down or clipped to maintain spacing and prevent movement, especially at corners where stress points are higher. This also helps maintain proper segregation of power and signal cables . Avoiding Sharp Edges: Any sharp edges at tray corners should be covered with protective strips or padding to prevent insulation damage . Planning and Layout: Minimize unnecessary bends and junctions. Plan the tray route to allow gradual turns and avoid congestion, which reduces the risk of cable damage and simplifies maintenance .

Summary

Running cables at corners is permissible if the installation respects the cable's bend radius, uses corner supports or guides, secures cables properly, and avoids sharp edges. Proper planning and adherence to NEC and industry best practices ensure safe, durable, and maintainable cable tray installations .