Cables in vertical shafts should be securely fixed using methods like binding tape, hooks, ladder or spiral tracks, ensuring mechanical stability, proper spacing, and safety.

Common Fixing Methods

1. Binding Tape Method Thread binding tape through the cable and attach it to the inner wall of the tray or bridge. This method is simple and effective for small to medium cables but is not recommended for very large or heavy cables .
2. Hook Method Install hooks along the inner wall of the tray and hang the cables on them. This is suitable for large or heavy cables but requires additional processing to install the hooks securely .
3. Ladder Track Method Arrange cables along a trapezoidal or ladder-shaped track and secure them with binding tape. This method provides strong support for large cables and helps maintain proper spacing .
4. Spiral Track Method Cables are arranged along a spiral track and fixed with binding tape. This method is ideal for vertical runs where gradual support is needed along the shaft .

Key Installation Considerations

• Firm Fixation: Ensure cables are tightly secured to prevent detachment or movement, which could cause safety hazards or mechanical damage .
• Cable Organization: Maintain neat and orderly cable runs to avoid tangling or disorder, which can complicate maintenance and reduce airflow .
• Mechanical Stress: Avoid over-tightening ties or clamps, which can damage insulation or conductors. Use mounting brackets, clamps, or cleats that provide consistent lateral clamping force .
• Thermal and Load Cycling: Account for cable expansion and contraction due to temperature changes or load cycling to prevent slippage, elongation, or insulation cracking .
• High Tensile Strength: For heavy or high-voltage cables, consider using steel wire armor or integrated pulling members to increase tensile strength and prevent slippage .
• Safety Precautions: Vertical shaft installations are inherently dangerous. Ensure proper planning, risk assessment, and use of personal protective equipment. Only trained personnel should perform the installation .

Best Practices

• Use UL-listed or manufacturer-approved vertical cable tray systems to ensure structural integrity and compliance with standards .
• Maintain adequate spacing between cables to allow heat dissipation and prevent overheating .
• Consider future cable additions by leaving room for expansion and avoiding overly tight stacking .
• For complex vertical shafts, consult with experienced engineers or specialists to design the tray layout and fixation method . By following these methods and considerations, cables can be safely and efficiently fixed inside vertical shafts, ensuring long-term reliability and compliance with electrical installation standards.