Article Overview
Tray-type or trough-type cable trays are solid or perforated-bottom trays designed to support and protect cables while limiting access and providing moderate ventilation.
Overview
Tray-type cable trays, also known as trough-type trays, are designed with a continuous bottom surface and side rails, forming a trough-like structure that supports cables along the entire length of the tray . Unlike ladder trays, which have open rungs, trough trays provide full cable support, making them suitable for single conductor cables, fiber optics, or sensitive instrumentation cables that require stable positioning and protection from sagging .
Design Features
- Solid Bottom Troughs: Provide complete support and protection for cables, ideal for environments where dust, debris, or accidental contact could damage cables .
- Perforated or Ventilated Troughs: Feature small holes in the bottom to allow limited airflow, helping with heat dissipation while still maintaining cable support .
- Side Rails: Continuous side rails enhance structural integrity and prevent cables from falling out.
- Materials: Commonly made from galvanized steel, aluminum, or FRP, depending on environmental exposure and load requirements .
Applications
Tray-type cable trays are widely used in industrial, commercial, and hazardous locations where cable protection is critical. They are often selected for:
- Single conductor cables and Type MV cables, which are not permitted in solid-bottom trays in certain NEC applications .
- Class II, Division 2 hazardous locations, where dust or flammable particles are present .
- Environments requiring limited cable access, such as secure or sensitive installations .
Advantages
- Full cable support reduces stress and sagging, protecting cable integrity.
- Moderate ventilation in perforated designs helps prevent overheating.
- Enhanced security for cables in sensitive or hazardous areas.
- Ease of maintenance: Cables are accessible for inspection or replacement without complete disassembly.
Comparison with Ladder Trays
| Feature | Ladder Tray | Tray/Trough Tray |
|---|---|---|
| Cable support | Supported at rungs only | Continuous bottom support |
| Ventilation | Excellent | Moderate (perforated) or minimal (solid) |
| Cable types | Power, heavy-duty | Single conductor, sensitive, or hazardous location cables |
| Heat dissipation | High | Moderate |
| Security | Low | High, limits cable access |
Tray-type cable trays are therefore ideal when cable protection, stability, and controlled access are priorities, while ladder trays are preferred for high heat dissipation and heavy power cable runs .
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