Spacing of electrical cable tray hanger supports

For typical cable tray installations, hangers should generally be spaced 1.5 to 3 meters apart horizontally, with vertical supports less than 2 meters apart, adjusted according to tray type, load, and cable characteristics.Horizontal Hanger SpacingFor straight horizontal runs, the distance between hangers or supports is typically 1.5 to 3 meters. This range ensures the tray remains stable, prevents sagging, and allows easy access for maintenance and cable installation . At corners, bends, or T-junctions, hangers should be installed on each side symmetrically to maintain stability and prevent stress on the cables . Fixed supports are also recommended at the start and end of the tray and at intervals for spans exceeding 30 meters .Vertical Hanger SpacingFor vertical cable tray runs, supports should be attached to the building structure with a spacing preferably less than 2 meters . This ensures vertical stability, prevents cable displacement, and maintains orderly cable arrangement. Cables within vertical trays should be secured at the top and every 1.5 meters along the run .Load and Cable ConsiderationsThe spacing of hangers may vary depending on the tray type, cable weight, and material. Stiffer cables, such as MDPE-sheathed cables, may require greater spacing to achieve the same allowable deflection, while more flexible cables like LSOH may need closer supports . Calculations using methods such as the Heinhold method can determine precise support distances based on cable stiffness and allowable sag .Additional RecommendationsEnsure adequate clearance between trays for airflow, heat dissipation, and future expansion; a minimum vertical clearance of 150 mm is recommended between stacked trays .Maintain horizontal separation between power and signal trays to reduce electromagnetic interference (EMI), typically 0.5 meters, or less if trays are shielded .Use hangers of sufficient diameter (e.g., ≥8 mm) to support the tray and cable weight safely .Secure cables at tray start, end, and turns, and every 3–5 meters along straight horizontal sections . Following these guidelines ensures a safe, stable, and maintainable cable tray system that minimizes mechanical strain, sagging, and interference while allowing for future modifications or expansions.