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How to fix the horizontal section of the vertical shaft cable tray

Properly fixing the horizontal section of a vertical shaft cable tray requires correctly positioning hangers, adjusting threaded rods, and securing clamps to maintain alignment and support.Step-by-Step Procedure

1. Position Hanger Rods and Nuts Thread the upper hex nut onto the all-thread rod approximately 203 mm (8") above the intended bottom of the tray. This nut acts as a stop for the clamp and helps maintain the tray elevation . 2. Install Clamps Around the Tray Place the appropriate clamp (SC for single tray or DC for double ladder trays) around the tray siderails. Insert a round washer on each hanger rod before lifting the tray so the threaded rod passes through the clamp holes. Ensure the washer is positioned between the upper hex nut and the top of the clamp . 3. Adjust Tray Elevation Add a second washer and hex nut on the rod above the tray. Thread this nut until the bottom of the tray reaches the desired horizontal level. Then, tighten the upper nut down to secure the clamp in place . 4. Ensure Proper Horizontal Alignment Use a carpenter's string or baling wire along the tray run to establish consistent elevation. Horizontal adjustment is limited by the length of the vertical rods; longer rods allow more adjustment . 5. Secure Cables For vertical shaft installations, cables may hang freely, but horizontal sections require proper tie-downs to prevent sagging. Use cable ties or clamps to maintain spacing and support, especially for multiconductor or large power cables, following NEC Section 392.9(A)(3) and CTI guidelines . 6. Verify Support Spacing Check that support brackets or hangers are spaced according to the tray type and load. Overloaded trays or long unsupported spans can cause sagging or bending . 7. Compliance and Safety Ensure installation meets NEC and CTI standards. For example, in hazardous dust locations, cables must be spaced and arranged in a single layer, and tie-downs may be required to maintain proper separation and airflow .

Additional Tips
  • Pre-thread nuts on hanger rods using a drill to save time.
  • Double-check that clamps are properly seated and washers are correctly positioned.
  • Inspect the tray after installation to ensure no sagging or misalignment occurs.
  • Consider using expansion joints or guides if the horizontal section is long or subject to thermal expansion . By following these steps, the horizontal section of a vertical shaft cable tray can be securely fixed, properly aligned, and compliant with electrical and safety standards.
How to fix the horizontal section of the vertical shaft cable tray

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Technical note

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