Requirements for fixing cables in vertical shaft cable trays

Cables in vertical shaft cable trays should be securely fixed using methods like binding tape, hooks, ladder or spiral tracks, while ensuring proper support, spacing, and safety against slippage or mechanical stress.

Key Fixing Methods

Binding Tape Method Thread binding tape through the cable and attach it to the inner wall of the tray. This method is simple and works for smaller cables but is not suitable for heavy or large-diameter cables. Hook Method Install hooks along the inner wall of the tray and hang the cables on them.

This is ideal for larger cables but requires additional processing to install the hooks. Ladder or Trapezoidal Track Method Arrange cables along a ladder or trapezoidal track and secure them with binding tape. This method provides strong support for heavy cables and ensures proper spacing.

Spiral Track Method Cables are arranged along a spiral track and fixed with binding tape. This is suitable for large cables and allows controlled routing along the vertical shaft.

Best Practices for Vertical Installations

Firm Fixation: Ensure cables are tightly secured to prevent detachment or sliding, which could create safety hazards.

Avoid Over-

Tightening: Excessive tightening of cable ties can damage insulation, while loose ties can allow slippage. Proper Snaking: Arrange cables with gentle curves to prevent sharp bends and maintain minimum bend radius, reducing stress on conductors. Support for Heavy Cables: For high-voltage or heavy cables, consider additional steel wires, pulling grips, or fail-safe mechanisms to prevent free fall during installation.

Thermal and Mechanical Considerations: Use mounting brackets, clamps, or cleats with constant lateral force to accommodate cable expansion, contraction, and thermal cycling. Avoid Closed Loops of Ferromagnetic Steel: When using metal structures for fixation, ensure no closed loops exist to prevent electromagnetic interference.

Safety and Planning

Vertical cable tray installations are inherently risky, especially for high-voltage or heavy cables. Proper planning, professional handling, and adherence to safety standards are essential. Using synchronized cable pushers or secondary support wires can reduce the risk of cable damage or accidents during installation.

By combining the appropriate fixing method with careful planning and safety measures, cables in vertical shaft trays can be securely installed, maintain proper spacing, and remain protected from mechanical and thermal stresses.