Parallel Angle of Cable Tray
The parallel angle of a cable tray refers to the alignment of trays running side by side or in parallel to a reference plane, ensuring proper spacing, support, and cable management.
Definition and Importance
In cable tray systems, the parallel angle is the orientation at which multiple trays are installed relative to each other or to structural elements like walls, ceilings, or floors. Maintaining a consistent parallel angle is crucial for:
- Mechanical stability: Proper alignment prevents undue stress on tray joints and supports.
- Cable management: Ensures cables are evenly distributed and reduces the risk of overcrowding or interference.
- Ease of maintenance: Parallel trays allow easier access for inspection, cable addition, or replacement.
Installation Considerations
- Support Elements: Cable trays are mounted using wall brackets, suspended supports, or center suspensions. These supports must be aligned to maintain the parallel angle across the run of the trays (OBO CMS guide) .
- Fittings and Bends: Horizontal and vertical bends, T-pieces, and crossovers should be installed carefully to preserve the parallel orientation of adjacent trays. Misalignment at bends can create uneven cable tension or reduce tray capacity .
- Spacing: Parallel trays should have adequate spacing to allow airflow, heat dissipation, and access for maintenance. The spacing depends on tray width, cable type, and load class .
- Standards Compliance: Installation should follow standards such as DIN EN 61537 or NEC 392, which provide guidelines for tray alignment, support intervals, and permissible angles for bends and offsets .
Practical Tips
- Use laser levels or alignment tools to ensure trays remain parallel over long runs.
- Check that all support brackets are installed at the same height and orientation.
- When trays change direction, use appropriate fittings to maintain parallelism with adjacent trays.
- Consider thermal expansion and mechanical load; slight adjustments may be needed to prevent tray deformation. Maintaining the correct parallel angle ensures structural integrity, safety, and optimal cable performance in industrial, commercial, or data center installations. Proper planning and adherence to standards are key to achieving a reliable cable tray system.
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