To make a 30-degree cable tray bend, calculate the cut dimensions using the tray width and angle, then bend or offset the tray according to the calculated measurements for a smooth installation.

Step 1: Determine the Tray Width and Angle

Identify the width of your cable tray and confirm that you need a 30-degree bend. This angle is commonly used for smoother cable paths, especially for fiber optic cables, and reduces stress on the cables compared to sharper angles .

Step 2: Calculate the Cut-Out Section

Use the formula: Cut-out size (D) = Tray width × Angle multiplier For example, for a 50 mm wide tray: 50 × 0.44 = 22 mm cut on each side . Other common tray widths and cut sizes:

• 100 mm tray → 26 mm cut
• 150 mm tray → 40 mm cut
• 200 mm tray → 53 mm cut
• 250 mm tray → 66 mm cut
• 300 mm tray → 80 mm cut This ensures the tray bends accurately to 30 degrees without deforming the structure .

Step 3: Mark and Cut the Tray

• Mark the calculated cut dimensions on the inside of the tray.
• For wire mesh trays, cut the bottom and inside side wires only, leaving the outside intact to maintain structural integrity .
• Use appropriate tools such as a bolt cutter for wire trays or a metal saw for solid trays .

Step 4: Bend the Tray

• After cutting, pull the inside edges together to form the 30-degree angle.
• For ladder or solid trays, use a bending brake or manual bending with supports.
• Ensure the bend is smooth to avoid sharp corners that could damage cables .

Step 5: Install and Support

• Place the bent tray in position, ensuring tangent sections are long enough for splice plates and supports .
• For offsets over obstacles, calculate the developed length: the total tray length needed for the rise, cross, and return sections. A 30-degree offset requires more run length than a 45-degree bend but provides a gentler path for cables .
• Secure the tray with clamps or brackets, leaving room for future maintenance.

Tips

• For fiber optic cables, 30-degree bends are preferred due to low bend radius requirements .
• Always double-check measurements before cutting to avoid wasting material.
• When making multiple bends, calculate each cut individually and test-fit before final installation . By following these steps, you can create a precise 30-degree cable tray bend that maintains cable integrity and fits neatly around obstacles.