Position cable tray screws according to the tray width, bracket spacing, and manufacturer guidelines to ensure secure and stable installation.

General Guidelines for Screw Positioning

1. Determine Screw Center Distance For ceiling or suspended installations, the center distance of the screw rod is typically the cable tray width plus 50 mm. For example, a 400 mm wide tray would require a screw center distance of 450 mm . This ensures proper load distribution and stability.
2. Bracket and Rod Alignment
   • Fix the Ω brackets to the floor or ceiling using heavy-duty expansion bolts.
   • The expansion center distance for M8×55 bolts is usually 98±3 mm .
   • Attach the hanging screw rod to the Ω bracket with the corresponding bolts, ensuring vertical alignment.
3. Clamp and Washer Placement
   • Place the clamp around the tray siderails.
   • Add a round washer on the threaded rod before lifting the tray section.
   • Thread the rod through the clamp holes, then add a second washer and hex nut to secure the tray at the desired height .
   • Ensure the uppermost hex nut is positioned above the clamp to maintain stability.
4. Fittings and Joint Screws
   • Fittings such as bends, tees, and reducers should be screwed onto the tray rail using truss-head bolts (FRS) and combination nuts .
   • All joint plates have integrated beading to protect cables and should be fastened securely to prevent movement.
5. Spacing Considerations
   • Maintain consistent spacing between screws and clamps to avoid sagging and ensure the tray can support the expected cable load.
   • For long runs, additional support rods or clamps may be required according to the tray width and load specifications.
6. Safety and Handling
   • Always wear protective gloves to prevent cuts from tray edges.
   • Only trained personnel should perform electrical and mechanical installation work .
   • Avoid over-tightening screws, which can deform the tray or fittings.

Summary

Correct screw positioning involves aligning the screw rods with brackets, maintaining proper center distances, securing clamps and washers, and fastening fittings according to manufacturer specifications. Following these steps ensures a stable, safe, and durable cable tray installation suitable for both indoor and outdoor environments.