Marking lines on cable trays at 90 degrees

Accurate 90-degree bends on cable trays are achieved by measuring, marking, and cutting using standard formulas and proper tools to ensure precise alignment and safe installation.Steps for Marking 90-Degree Bends

1. Measure the Bend Location: Determine the exact point where the 90-degree bend is required. Measure from the start of the tray to the bend location, considering any offsets or obstacles in the installation path . 2. Determine Bend Allowance: Calculate the bend allowance using the tray width and the type of bend (horizontal or vertical). For wire mesh trays, the bend allowance accounts for the tray's mesh thickness and the angle of the bend . Standard formulas for 90-degree bends often involve multiplying the tray width by a factor to determine the cut line placement. 3. Mark the Cut Lines: Use a straightedge or a marking tool to draw lines across the tray at the calculated points. Ensure the lines are perpendicular to the tray edges for a precise 90-degree bend. For vertical bends, mark both the top and bottom edges to guide the bending process . 4. Cut and Deburr: Cut along the marked lines using appropriate tools such as bolt cutters or metal shears. After cutting, deburr the edges to remove sharp metal fragments and prevent damage to cables . 5. Bend the Tray: Using a bending tool or manually, bend the tray along the marked lines. For wire mesh trays, ensure the bend is smooth and maintains the tray's structural integrity. Check the angle with a protractor or square to confirm a true 90-degree bend .

Tips for Accuracy and Safety

• Use Templates or Guides: Pre-made templates can help maintain consistent bends across multiple trays.
• Label Lines: Mark flow direction or cable type on the tray to avoid confusion during installation.
• Avoid Cutting Across Slots: For perforated trays, ensure cuts do not compromise the tray's strength .
• Protective Coating: Be aware that cutting may expose metal; zinc or paint coatings can be reapplied if necessary to prevent corrosion . By following these steps and using proper measurement and marking techniques, installers can achieve precise 90-degree bends in cable trays, ensuring both functional and safe cable routing .