Length of anti-sway support for cable trays

Anti-sway supports for cable trays should be installed at key points such as tray ends, corners, T-junctions, and vertical runs, with spacing typically less than 2 meters for vertical runs and every 3–5 meters for horizontal runs. General GuidelinesAnti-sway supports are critical to maintain the stability of cable trays, prevent sagging, and reduce mechanical stress on cables. They are especially important in vertical runs, long horizontal spans, and at points where the tray changes direction or height.

Horizontal Runs

Supports should be installed at the start, end, and at every bend of the tray. For straight horizontal sections, supports are recommended every 3–5 meters depending on tray material, cable weight, and environmental conditions. Anti-sway braces may be added at intervals to prevent lateral movement, particularly in long spans or where trays are exposed to vibration or wind.

Vertical Runs

Vertical cable tray runs require supports fixed to the building structure. Spacing for vertical supports should preferably be less than 2 meters to ensure stability and prevent swaying. Cables within vertical trays should be secured at the top and every 1.

5 meters to maintain order and reduce mechanical strain.

Special Points

Corners, T-junctions, and tray ends must always have fixed supports to distribute weight and prevent sagging. For long spans exceeding 30 meters, additional supports are necessary to maintain structural integrity. When installing parallel trays at the same height, maintain a minimum distance of 0.

6 meters between them to allow for maintenance and airflow. Standards and MaterialsIEC 61537 provides guidance on mechanical strength, load testing, and installation compatibility for cable trays and supports.

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S 7671 emphasizes that wiring systems must be supported to avoid undue mechanical strain and ensure fire safety, requiring fire-resistant support materials. Supports are typically made of steel or stainless steel, with corrosion-resistant coatings for industrial or outdoor environments.

Practical Considerations

Ensure anti-sway supports are compatible with tray type (ladder, perforated, or mesh). Consider environmental factors such as wind, vibration, or seismic activity when determining support spacing. Properly installed anti-sway supports improve safety, reduce cable stress, and facilitate maintenance and inspection.

By following these guidelines, cable tray systems will remain stable, safe, and compliant with international standards.