Cable tray horizontal elbow opening dimensions
Horizontal elbows in cable tray systems are available in standard widths matching the tray, with radii typically ranging from 305 mm to 1220 mm and angles of 30°, 45°, 60°, and 90°.
Standard Widths and Heights
Horizontal elbows are designed to match the nominal width and height of the straight cable tray sections. Common widths include 150 mm, 203 mm, 300 mm, 450 mm, 600 mm, 750 mm, and 900 mm, while standard side rail heights range from 50 mm to 175 mm, depending on the tray type and load requirements . The height is measured from the top of the rung to the top of the side rail, ensuring compatibility with the straight sections.
Radii and Angles
Horizontal elbows are manufactured with four standard radii:
- 305 mm (12 inches)
- 610 mm (24 inches)
- 915 mm (36 inches)
- 1220 mm (48 inches) These radii allow smooth cable bending and reduce stress on the cables during direction changes. Elbows are also available in four standard angles: 30°, 45°, 60°, and 90°, enabling flexible routing in tight or open spaces .
Spacing and Construction
For ladder-type trays, a normal spacing of 225 mm through the middle of the fitting is maintained to ensure proper cable support and ventilation. Horizontal elbows are typically made from aluminum or steel, with finishes such as hot-dip galvanized, bare galvanized, or powder-coated, depending on environmental requirements . The material thickness and side rail height are critical for load capacity and long-term durability.
Practical Considerations
When selecting a horizontal elbow, ensure:
- The width matches the existing tray to maintain cable fill compliance.
- The radius is sufficient to prevent cable damage, especially for large or high-voltage cables.
- The angle fits the routing plan without creating sharp bends.
- The material and finish are suitable for the installation environment, such as indoor, outdoor, or corrosive conditions . By following these standards, horizontal elbows provide smooth transitions, maintain structural integrity, and comply with NEC, NEMA, and IEC guidelines.
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