Cable laying in vertical shaft trough-type cable trays

Cables in vertical shaft trough-type trays should be secured using proper support spacing, cable ties, and modular fixing methods to prevent sagging, maintain alignment, and ensure safety.

Understanding Trough-

Type Cable TraysTrough-type cable trays are rigid structures with a solid or ventilated bottom and side rails, designed to support and protect electrical and data cables. They are particularly suitable for vertical installations because the solid bottom prevents smaller cables from sagging and provides continuous support along the shaft. The side rails add structural strength and help contain cables, reducing the risk of accidental contact or displacement.

Cable Fixing Techniques

Support Spacing: In vertical shafts, it is essential to maintain consistent support intervals to prevent cable sag and uneven load distribution. A typical spacing for cable supports in vertical runs is 150–230 mm (6–9 inches), depending on cable size and weight. Supports can be in the form of brackets, rungs, or intermediate fixing points attached to the tray or shaft wall.

Cable Ties and Clamps: Use UV-resistant or fire-rated cable ties to secure cables to the tray side rails. For heavier cables, mechanical clamps or straps may be preferred to avoid deformation or damage. Ensure ties are snug but not overly tight to prevent insulation damage.

Segregation and Layering: Separate power and control/data cables to reduce electromagnetic interference. Arrange cables in layers, keeping heavier cables at the bottom and lighter ones on top, maintaining the tray's load capacity. Bend Radius Considerations: Maintain the minimum bend radius for each cable type as it enters or exits the tray to prevent stress and potential damage.

Use radius elbows or vertical bends designed for trough trays to guide cables smoothly. Modular Fixing Accessories: Utilize modular brackets, vertical supports, and intermediate hangers designed for trough-type trays. These accessories allow for easy adjustment and expansion of cable runs while maintaining proper alignment.

Material and Safety Considerations

Material Selection: Steel trays offer higher load capacity, while aluminum trays are lighter and corrosion-resistant. Choose based on environmental conditions and cable weight. Load Compliance: Ensure the total cable weight does not exceed the tray's rated load.

Overloading can compromise structural integrity and safety. Protection: Solid-bottom trays provide maximum protection against dust, moisture, and falling debris, which is particularly important in vertical shafts.

Summary

For vertical shaft installations using trough-type cable trays, consistent support spacing, proper cable ties or clamps, careful layering, and adherence to bend radius requirements are key to safe and reliable cable management. Using modular accessories and selecting the appropriate tray material ensures long-term durability and compliance with industry standards.