Cable tray elbows and tees are manufactured in standard radii and angles, with lengths varying according to the tray width and fitting type.

Standard Dimensions

Cable tray elbows and tees are designed to match the width and height of the straight tray sections they connect to. Typical radii for elbows and tees are 305 mm, 610 mm, 915 mm, and 1220 mm, and they are available in angles of 30°, 45°, 60°, and 90° . The actual length of a fitting depends on the radius and the angle: a larger radius or a wider tray results in a longer fitting. For example, a 90° elbow with a 610 mm radius will have a longer centerline length than a 30° elbow with the same radius. Similarly, a horizontal tee will have a length that accommodates the main run and the branch, typically maintaining a 225 mm spacing through the middle of the fitting for standard ladder trays .

Factors Affecting Fitting Length

1. Tray Width and Height: Wider or deeper trays require longer elbows and tees to maintain proper bend radius and cable fill compliance .
2. Bend Radius: Larger radii reduce stress on cables and improve airflow but increase the fitting length .
3. Angle of Bend: Acute angles (30°) result in shorter fittings, while right angles (90°) are longer .
4. Tray Type: Ladder, perforated, channel, and wire mesh trays may have slightly different fitting lengths due to structural design and material thickness .

Practical Considerations

• Always verify the manufacturer's datasheet for exact fitting lengths, as custom or non-standard sizes may be available .
• Ensure the fitting radius meets the minimum bend radius of the cables to prevent damage during installation .
• For planning purposes, the centerline length of the fitting is often used to calculate total tray run length and support spacing . In summary, the length of cable tray elbows and tees is not fixed but depends on the tray width, height, bend radius, and angle. Standard radii and angles provide a guideline, but exact dimensions should be confirmed with the manufacturer's specifications to ensure proper installation and cable protection .