Dimensions for cable tray bends

Cable tray bends are typically made at standard angles of 30°, 45°, 60°, 75°, and 90°, with dimensions depending on tray width, duty rating, and material type.

Standard Bend Angles and Types

Cable tray bends are available in flat bends and adjustable bends. Common fixed angles include 45° and 90°, while adjustable bends can be configured at 30°, 45°, 60°, 75°, and 90° for medium and heavy-duty trays up to 300mm wide (Metsec) . Light-duty trays usually have fixed 45° and 90° bends. These bends allow the tray to navigate around obstacles or change direction while maintaining cable integrity.

Tray Widths and Duty Ratings

Bends must match the tray width and duty rating. Standard widths range from 50mm to 900mm, with the width measured inside the tray to determine cable capacity . Duty ratings (light, medium, heavy) affect the material thickness and structural strength, which in turn influence the bend radius and feasibility of installation.

Material and Finish

Cable tray bends are typically made from mild steel (pre-galvanized or hot-dip galvanized) or stainless steel grade 316L for corrosive environments . The material choice affects the bend radius and the method of fabrication, ensuring the tray maintains structural integrity and supports the cable load.

Calculating Bend Dimensions and Offsets

For complex routing, offsets are used to step the tray over or around obstacles. The sloped section length connecting two bends can be calculated using trigonometry or a cable tray offset calculator, which considers the bend angle, offset distance, and available installation space . The calculation ensures proper alignment and prevents excessive stress on cables.

Practical Tips

• Measure the inside width of the tray to ensure the bend matches the cable fill requirements .
• Use standard multipliers for common angles to quickly estimate sloped section lengths for offsets .
• Ensure bends are compatible with covers if required, as 45° and 90° bends often have closed or ventilated cover options .
• Verify that the bend radius is sufficient to prevent cable damage, especially for power or fiber optic cables. By following these guidelines, you can design and fabricate cable tray bends that are structurally sound, code-compliant, and suitable for the intended cable load.