Vertical trough-type cable trays are fixed using wall-mounted brackets, trapeze hangers, or specialized tracks, with cables secured via binding tape, hooks, or spiral arrangements depending on size and weight.

Support and Fixing Principles

Material and Structural Requirements: Vertical cable trays are typically made from cold-rolled steel, galvanized steel, or aluminum alloy, with surface treatments like hot-dip galvanizing or electrostatic spraying to ensure corrosion resistance and mechanical strength. The load-bearing capacity should meet at least 200 kg/m, and fire resistance must comply with GB 8624 Class B1 standards . Support Methods:

• Wall-mounted brackets: Cantilever brackets are fixed directly to walls to support vertical runs.
• Trapeze hangers: Suspended from ceilings or structural beams, these provide additional support for long vertical sections .
• Spacing: Maintain proper clearances from other services (≥300 mm from ducts or pipes) and between multiple tray layers (≥150 mm), using isolation plates where necessary .

Cable Fixing Techniques

1. Binding Tape Method: Cables are threaded with binding tape and secured to the inner wall of the tray. This method is simple but best suited for smaller cables .
2. Hook Method: Hooks are installed on the tray's inner wall to hang larger cables. This requires additional hook fabrication but is effective for heavy cables .
3. Ladder or Trapezoidal Track Method: Cables are arranged along a trapezoidal track and fixed with binding tape, suitable for large cables and organized routing .
4. Spiral Track Method: Cables follow a spiral track and are secured with binding tape, ideal for large or flexible cables requiring controlled spacing . Best Practices:

• Ensure all cables are firmly fixed to prevent detachment or safety hazards.
• Maintain neat and orderly cable arrangement for accessibility and maintenance.
• Select the fixing method based on cable size, weight, and the vertical tray configuration .

Compliance and Standards

All installations should comply with NEMA VE 1 standards for load-bearing capacity and material quality, and follow national codes such as GB 50303 for construction quality and fire safety . Proper planning of support spans and cable fill is essential to prevent overloading and ensure long-term safety and reliability . By combining appropriate support structures with the correct cable fixing method, vertical trough-type cable trays can provide a safe, organized, and code-compliant solution for routing electrical and communication cables in buildings.