Installation Spacing of Metal Cable Tray Supports

Metal cable tray supports should generally be spaced 3–5 meters for horizontal runs and 1.5 meters for vertical runs, with adjustments based on cable weight, type, and regulatory requirements.

Horizontal and Vertical Support Spacing

For horizontal cable tray runs, supports should be installed at the start, end, and at every 3 to 5 meters along straight sections to prevent sagging and mechanical strain on cables . For vertical runs, supports are recommended at the top and every 1.5 meters to maintain stability and prevent undue stress on terminations .

Binding and Cable Arrangement

Cables within trays should be laid straight and orderly, avoiding overlaps or crossings. When binding cables, the distance between ties should not exceed 1.5 meters, ensuring even tension and preventing damage . In troughs or wireways, binding may not always be necessary, but proper clearance and fill rates must be maintained.

Tray and Support Considerations

• Rung spacing for ladder-type trays is typically 150–230 mm (6–9 inches), especially for instrumentation and control cables .
• Tray height above ground should ideally be at least 2.2 meters, with a minimum 0.3 meters clearance from ceilings or obstructions .
• Cross-sectional fill rate should not exceed 50% to allow airflow and prevent overheating .
• Supports must be fire-resistant and capable of withstanding mechanical loads, including cable weight and environmental factors .

Standards and Compliance

Metal cable tray systems should comply with BS EN 61537 for cable ladder and tray systems, and BS 6946 for channel support systems . Supports must prevent undue mechanical strain on cables and ensure safe installation, particularly in industrial or hazardous environments. Materials such as steel, stainless steel, or aluminum with appropriate corrosion protection are recommended .

Practical Tips

• Use non-metallic banding where possible to avoid rust or contamination of stainless steel trays .
• For long tray sections, ensure even support spacing to accommodate the weight of bundled cables.
• Adjust support spacing in fire-resistant or explosion-proof areas according to local regulations . By following these guidelines, cable trays will maintain structural integrity, prevent cable damage, and comply with safety and performance standards.