Using trough-type cable trays to fix vertical cables

Trough-type cable trays can be used for vertical cable runs, providing continuous support and preventing sag, especially for smaller control or instrumentation cables.

Overview of Trough-Type Cable Trays

Trough-type cable trays, also known as ventilated trough trays, feature a solid or partially ventilated bottom that offers continuous support for cables while allowing some airflow to prevent heat buildup . They are particularly suitable for smaller-diameter control, instrumentation, or communication cables that may sag if installed in ladder-type trays, which have spaced rungs . The ventilated design balances support and ventilation, making it ideal for vertical installations where cable stability is critical.

Vertical Installation Considerations

1. Support and Spacing: Vertical cable runs require proper support to prevent sagging and maintain the minimum bend radius. Trough trays provide a continuous surface that helps maintain cable alignment and spacing . For long vertical runs, intermediate supports such as wall brackets or center suspensions may be necessary to secure the tray to the structure .
2. Cable Securing: Use cable ties, clamps, or hold-downs to fix cables within the trough, ensuring they do not shift or pull on connectors. This is especially important for vertical runs where gravity can cause cables to slide or bunch together .
3. Environmental Factors: Consider the material of the trough tray based on the environment. Steel or stainless steel trays are common, with galvanization or coatings for corrosion protection. In corrosive or high-moisture environments, fiberglass-reinforced plastic (FRP) troughs may be preferred .
4. Bends and Transitions: For vertical routing, use vertical bends (risers) or T-pieces to transition cables between horizontal and vertical sections. Ensure the bend radius meets cable manufacturer specifications to avoid damage .

Advantages of Trough Trays for Vertical Runs

• Provides continuous support, reducing stress on cables and connectors.
• Prevents sagging in long vertical runs.
• Allows easy access for maintenance and future cable additions.
• Suitable for smaller, sensitive cables that require protection from mechanical stress.

Comparison with Other Tray Types

• Ladder trays: Better for large power cables due to ventilation but may allow sag in vertical runs of smaller cables.
• Wire mesh trays: Flexible and lightweight but may require additional securing for vertical runs.
• Solid bottom trays: Maximum protection but limited ventilation, which may be unnecessary for low-heat cables .

Best Practices

• Maintain minimum bend radius at entry and exit points.
• Use intermediate supports for long vertical sections.
• Secure cables with ties or clamps to prevent movement.
• Select tray material appropriate for environmental conditions.
• Ensure compliance with DIN EN 61537 or local electrical standards for cable support systems . By following these guidelines, trough-type cable trays can effectively support vertical cable installations, providing both mechanical stability and ease of maintenance.