Vertical elbows in cable trays are created using purpose-made fittings that maintain proper bend radius and structural integrity, rather than field-cutting or bending straight trays.

Use Factory-Made Elbow Fittings

Vertical cable tray elbows are designed to connect straight tray sections while preserving the minimum bend radius required for cables, preventing insulation stress and performance degradation . Common fittings include 30°, 45°, and 90° vertical elbows, which allow smooth transitions between vertical and horizontal runs . Using factory-made elbows ensures a controlled sweep and avoids sharp bends that could damage cables .

Installation Steps

1. Select the Correct Elbow: Choose a vertical elbow compatible with your tray type (ladder, ventilated trough, or solid-bottom) and NEMA class. Ensure the side rail width and splice plate configuration match the straight tray sections .
2. Align Connectors: Each tray segment has connectors at the ends. Position the elbow so that its connectors align precisely with the straight tray ends to maintain proper orientation .
3. Bolt the Fitting: Use the jointing set or splice plates provided with the elbow to securely fasten it to the straight tray sections. Ensure all bolts are tightened according to manufacturer specifications .
4. Check Bend Radius: Verify that the installed elbow maintains the required bend radius for the cables being routed. This is critical for fiber optic or data cables, which are sensitive to sharp bends .
5. Support and Grounding: Ensure the elbow and connected trays are properly supported and bonded to meet electrical code requirements .

Additional Considerations

• Avoid Field Bending: Cutting and bending straight trays on-site can compromise structural integrity and cable performance .
• Cable Fill: Calculate cable fill to ensure the elbow does not exceed the tray's allowable capacity, preventing overheating or mechanical stress .
• Orientation: For vertical transitions, ensure the elbow is oriented correctly to connect horizontal and vertical runs seamlessly . By following these steps and using the correct factory-made vertical elbow fittings, you can create safe, reliable, and code-compliant vertical transitions in cable tray systems.