Round the corners of the cable tray

Corners of cable trays should be rounded or protected using bends, radius fittings, or grommets to prevent cable damage and maintain proper bend radius.

Using Cable Tray Fittings

Cable trays are designed with pre-fabricated bends and radius fittings to create smooth transitions at corners. Common options include 30°, 45°, 60°, and 90° horizontal or vertical bends, as well as tees and wyes for branching runs ( ). These fittings ensure that cables follow a gradual curve, reducing stress and preventing kinks or insulation damage ( ).

Maintaining Minimum Bend Radius

When rounding corners, it is crucial to maintain the minimum bend radius recommended for the type of cable being installed. Exceeding this radius can cause signal degradation, insulation stress, or mechanical failure. Ladder and ventilated trays often allow for smooth, gradual bends that comply with cable specifications ( ).

Edge Protection with Grommets

For sharp or cut edges, cable grommets or edge guards provide additional protection. Flexible PVC grommets, grommet strips, or EdgeGuard products can be inserted along tray edges to prevent abrasion and strain on cables ( ). These are especially useful for sheet metal cut-outs or custom tray modifications.

Practical Tips

• Use modular tray systems that allow easy installation of bends and corner fittings ( ).
• Ensure rung spacing is appropriate (typically 6–9 inches) to support cables and maintain proper bend radius ( ).
• For custom or tight corners, consider flexible grommet strips to cover sharp edges and maintain cable integrity ( ).
• Always follow manufacturer guidelines and local electrical codes for cable tray installation and corner protection ( ). By combining pre-fabricated bends, proper bend radius, and edge protection, you can safely round cable tray corners while protecting cables from mechanical stress and extending their service life.