Temporary cable tray erection

Temporary cable tray erection involves safely supporting and aligning cable trays before permanent installation, ensuring stability, proper spacing, and compliance with standards.Planning and PreparationBefore erecting temporary cable trays, review construction drawings, manufacturer instructions, and applicable standards such as IEC 61537 for metal cable trays . Identify the required tray type, size, and route, and ensure all materials, supports, and fasteners are available. Conduct a site survey to check for obstructions, clearances, and potential hazards.Support and AlignmentTemporary supports should be installed to maintain tray elevation and alignment. Use unistruts, MS angles, or C-channels as temporary supports, spaced according to the tray type and load . Typically, supports are placed so that splice joints fall between the support point and the quarter-point of the span, avoiding mid-span placement . Ensure supports are level and securely anchored, using bolts, clamps, or temporary brackets.Installation ProcedureMark the tray route and establish a level line for elevation.Install temporary supports at the planned intervals, ensuring stability.Lift and place trays individually onto the supports, temporarily fixing them while splicing other trays .Align trays and supports before permanent bolting or welding.Check clearances from other services and ensure no undue mechanical strain on the trays or cables .Smooth and paint cut edges of trays and supports to prevent injury and corrosion .Safety ConsiderationsUse fall protection when working at heights.Avoid placing splice plates over supports or mid-span.Ensure temporary supports can handle the weight of fully loaded trays and installation personnel .Maintain electrical continuity if trays will serve as grounding paths, using bonding jumpers where necessary .Temporary Cable HandlingWhile trays are temporarily erected, cables can be loosely laid or guided through the trays using HDPE conduits or clamps at intervals of about 1 meter . Avoid overloading or stressing cables during temporary installation.Transition to Permanent InstallationOnce the tray alignment and support positions are verified, permanent fixing, splicing, and grounding can be completed. Temporary supports may be replaced with permanent MS structures or wall-mounted brackets, and all trays should be isolated with insulating materials where required . By following these steps, temporary cable tray erection ensures safe, stable, and code-compliant installation, minimizing risks during construction and facilitating smooth transition to permanent installation.