Spacing between cable tray hanger supports

Cable tray supports should typically be spaced 1.5 to 3 meters apart for horizontal runs, with hangers not exceeding 1.5 meters, while vertical runs require supports at intervals of less than 2 meters.

Horizontal Cable Tray Runs

For straight horizontal sections, the support span between cable tray supports generally ranges from 1.5 meters to 3 meters, depending on the tray type, material, and cable load. This spacing ensures structural stability, prevents sagging, and allows for maintenance and inspection . At corners, bends, or T-junctions, it is recommended to install one hanger on each side, arranged symmetrically to maintain tray stability and prevent undue stress on the cables . Fixed supports should also be placed at the beginning and end of the tray and at beam locations to distribute weight effectively .

Vertical Cable Tray Runs

For vertical installations, supports should be fixed to the building structure at intervals preferably less than 2 meters. Cables within vertical trays should be secured at the top and then every 1.5 meters to maintain order and prevent displacement . Hanging rod supports for vertical runs should have a minimum diameter of 8 mm to ensure stability .

Cable Hangers and Flexible Systems

When using cable hangers or J-hanger installations, the spacing may vary depending on the cable type, weight, and stiffness. Flexible systems require calculations to determine the distance between supports to achieve a small deflection (typically 2%) and prevent expansion or displacement due to thermal effects . Stiffer cables, such as MDPE-sheathed types, may require greater spacing between supports compared to more flexible cables like LSOH types .

Best Practices

• Always secure cables at start, end, and turns of horizontal runs, and at top and intervals in vertical runs .
• Avoid cable crossings or overlaps within trays to maintain organization and airflow .
• Use fire-resistant supports for all cable types to prevent premature failure in case of fire .
• Ensure supports are installed by competent personnel familiar with electrical installation standards and safety practices . By following these guidelines, cable tray systems will maintain structural integrity, safety, and ease of maintenance, while minimizing mechanical strain on the cables.