Trough-type cable trays are primarily divided into solid-bottom and ventilated-bottom types, and can also be categorized by material such as metal, plastic, or fiberglass.

Structural Division

1. Solid-Bottom Trough Trays: These trays have a continuous solid base that provides maximum protection for cables against dust, moisture, and mechanical damage. They are ideal for sensitive cables, horizontal runs, and environments where minimal cable sag is critical .

2. Ventilated-Bottom Trough Trays: These feature perforations or slots in the bottom to allow heat dissipation and reduce weight. They are suitable for applications where moderate ventilation is needed while still offering continuous cable support .

Material-Based Division

• Metal Trough Trays: Typically made of steel or aluminum, metal trays offer high load capacity and structural strength. They are commonly used in industrial and commercial installations but may have limited heat dissipation for high-current cables .

• Plastic or Polymer Trough Trays: Made from polymer alloys or fiberglass, these trays are corrosion-resistant and suitable for humid or chemically aggressive environments. They also provide electrical insulation for sensitive low-voltage or communication cables .

Application-Based Considerations

• Depth and Width Ratio: Trough trays are deeper than standard tray-type cable trays, making them suitable for computer, communication, and control cables with low heat generation .

• Enclosed Design: The fully enclosed structure of trough trays provides dustproof and anti-interference protection, which is advantageous for weak-current or sensitive signal cables .

In summary, trough-type cable trays are divided by bottom type (solid or ventilated), material (metal, plastic, fiberglass), and structural depth, allowing engineers to select the appropriate tray based on cable type, environmental conditions, and load requirements .