Standard Distance of Cable Tray Supports

For horizontal cable tray runs, supports are typically spaced 1.5 to 3 meters apart, with closer spacing required for bends, vertical runs, or heavier loads.

Horizontal Runs

For straight horizontal sections, the support span between hangers or brackets is generally 1.5 to 3 meters depending on the tray type, material, and cable load. Ladder-type trays often follow NEC guidelines, recommending supports every 4 to 6 feet (approximately 1.2 to 1.8 meters) to ensure proper load distribution and prevent sagging . Perforated or solid trays may require slightly different spacing based on manufacturer specifications and load ratings .

Vertical Runs

Vertical cable tray sections should be supported at intervals preferably less than 2 meters to maintain stability and prevent excessive stress on the tray and cables . Supports should be fixed to the building structure, and additional attention is needed at bends or junctions.

Bends, Corners, and T-Junctions

At corners or bends, one support should be installed on each side of the bend, arranged symmetrically. This ensures the tray remains stable and prevents cable stress . For long runs exceeding 30 meters, additional fixed supports are recommended at intermediate points.

Load Considerations

Support spacing may need adjustment based on tray type, cable weight, and environmental factors. IEC 61537 specifies testing for deflection and yield strength at spans commonly of 1 m, 1.5 m, and 2 m, and manufacturers provide load ratings to guide proper support placement . Heavier cable loads or outdoor installations may require closer support spacing.

Additional Recommendations

• Hanging rods should have a minimum diameter of 8 mm for stability .
• Cables should be secured at the start, end, turns, and every 3 to 5 meters along straight sections .
• Horizontal spacing between parallel trays should be at least 0.6 meters, and between power and signal trays at least 0.5 meters to reduce interference . By following these guidelines, cable tray systems maintain structural integrity, allow safe maintenance, and comply with NEC, IEC, and BS EN standards.