Drilling positions for cable tray fixing brackets

Drilling positions for cable tray fixing brackets should align with the tray's support points, typically at the center of the bracket channel, with spacing according to tray type and load requirements.General GuidelinesSupport Spacing: Cable trays should be supported at regular intervals to prevent sagging. For horizontal installations, typical support spacing ranges from 1.5 m to 3.6 m, depending on tray type, material, and load capacity . Additional supports are required at bends, tees, crossovers, or where cables exit the tray . Bracket Placement: Brackets should be positioned so that the flat surface of the tray rests on the cantilever arm. For perforated trays, it is recommended to place the tray with the non-perforated side on top to provide a stable fixing surface . Brackets often feature slot patterns to allow flexible positioning of bolts and clamps . Drilling Holes:Use a drilling jig to ensure accurate hole alignment. Typical hole sizes for fixing bolts are M6 or M10, depending on the bracket and tray system .Drill through the center of the bracket channel and the tray if using cover clamps or splice connectors.For dividers or end plates, align holes with the pre-existing rung or tray holes to simplify installation .When using sleeve inserts, square holes allow for 2 or 4 bolt securing solutions, depending on the application . Fastening:Use dome-headed bolts, nuts, and washers with finishes suitable for the tray material (galvanized or stainless steel) to prevent corrosion .Recommended torque values are typically 10–35 Nm, depending on bolt size and tray type .In areas with vibration, a small bead of elastic adhesive on the bolt thread can reduce loosening . Spacing Between Holes:For dividers, holes are often spaced 900 mm apart and secured at 4 locations along the divider .Ensure that all drilled holes maintain a minimum 40 mm clearance between the tray and the supporting structure .Best PracticesAlways follow manufacturer-specific installation guidelines and standards such as IEC 61537 for cable management systems .Avoid using cable trays as walkways or for personnel support .Ensure all drilled holes and fasteners are aligned and tightened properly to maintain structural integrity and prevent sagging or misalignment .Use original accessories like clamps, splice connectors, and fixing bolts to maintain warranty and system performance . By following these guidelines, drilling positions for cable tray fixing brackets can be accurately determined, ensuring a safe, stable, and compliant cable management installation.