Fixing Spacing for Cable Trays and Hangers

Cable trays should be supported at intervals of 1.5–3 meters horizontally, with vertical spacing and hanger placement determined by cable type, load, and installation orientation.

Horizontal and Vertical Support Spacing

For horizontal runs, cable trays are typically supported every 1.5 to 3 meters to prevent sagging and maintain system integrity, while allowing easy access for maintenance and inspection . For vertical runs, supports should be placed according to the vertical spacing requirements, which may be more frequent depending on the cable weight and length of the run . Long vertical runs exceeding 32 meters should include strain relief sections, offset by at least two cable diameters to reduce mechanical stress .

Parallel and Adjacent Trays

When installing two cable trays in parallel at the same height, maintain a minimum distance of 0.6 meters to allow maintenance access, proper airflow, and heat dissipation . For power and signal cable trays, a minimum separation of 0.5 meters is recommended to reduce electromagnetic interference (EMI). If the trays are shielded, this spacing can be reduced to 0.3 meters .

Hanger and Support Considerations

Hanging rod supports should be at least 8 mm in diameter to ensure stability for vertical runs and prevent stress on cables at bends . Supports should be applied on either side of bends, and all cable supports must be fire-resistant to prevent premature failure in case of fire . The support distance is measured between the centers of adjacent support elements, and the system must withstand mechanical loads, including the weight of cables and environmental factors like wind or snow .

Additional Guidelines

• Maintain minimum vertical clearance of 150 mm between floor-mounted trays or between upper and lower trays to facilitate ventilation, heat dissipation, and future expansion .
• Ensure that cables are not exposed to undue mechanical strain and that terminations are free from stress .
• Use metallic supports rather than relying solely on cable ties or non-metallic clips for suspended or surface-mounted cables . By following these spacing guidelines, cable tray systems will remain structurally sound, safe, and maintainable while minimizing risks of sagging, interference, and fire hazards.