Distance between supports at cable tray bends

Cable trays must be supported at each side of a bend, with hanger spacing typically not exceeding 1.5 meters, and additional strain relief may be required for long vertical runs.Support at BendsWhen a cable tray changes direction, supports should be installed on both sides of the bend to maintain stability and prevent stress on the cables inside the tray. This ensures that the tray remains level and the cables are not subjected to excessive tension or deformation during installation or operation .Horizontal and Vertical RunsHorizontal straight runs: Supports are generally spaced 1.5 to 3 meters apart, depending on tray type, load, and manufacturer recommendations .Vertical runs: Supports should be fixed to the building structure with a spacing preferably less than 2 meters to prevent sagging and maintain cable alignment .Long vertical runs (>32 meters): Include strain relief sections, typically offset by at least 2 cable diameters or a short horizontal section of at least 1 meter to relieve tension .General Guidelines for Support PlacementStart, end, and turns: Always secure the tray at the beginning, end, and at bends or T-junctions .Fixed supports: Place at beam locations or structural points to distribute weight evenly and prevent sagging .Hanger diameter: When using rod supports, the rod should be at least 8 mm in diameter .Binding cables: Tie cables within the tray at intervals not exceeding 1.5 meters to maintain order and prevent displacement .Compliance and SafetyEnsure that all supports and fixings are fire-resistant if required, and that the installation complies with relevant standards such as BS 7671, NEC, IEC, or NEMA . Proper support spacing at bends and along runs is critical to prevent mechanical stress, maintain airflow, and allow safe maintenance access. By following these guidelines, cable trays will remain structurally sound, cables will be protected from damage, and the system will meet safety and regulatory requirements.