Installation of Mechanical Cable Trays in Mali

Mechanical cable trays in Mali should be installed following approved material inspections, proper storage, safe handling, and adherence to international standards for load, support, and accessibility.Material Inspection and ApprovalAll cable trays, ladders, and accessories must be inspected upon delivery to ensure compliance with approved material submittals. Any damaged or non-conforming materials should be documented and returned to the supplier, with a Non-Conformance Report issued if necessary . A Material Inspection Request (MIR) should be submitted to the project engineer or employer for approval before installation .Storage and HandlingMaterials should be stored off the ground in a dry, ventilated area to prevent corrosion or mechanical damage. Cable trays should be laid horizontally on timber supports spaced approximately one meter apart and covered to protect from sunlight and moisture . Extreme care must be taken during handling, using appropriate lifting equipment or manual handling with gloves and steel-toed footwear .Installation ProcedureReview Shop Drawings: Confirm the layout, length, and location of cable trays and ladders according to approved shop drawings .Prepare Supports: Determine the required elevation from the floor and establish a level line using a laser or nylon string. Supports should be designed to carry the expected load, including future cable additions, and spaced according to tray type (maximum 3 meters for ladder trays, 2 meters for perforated trays), .Mounting and Securing: Cable trays should be installed flat whenever possible. Vertical or edgewise installations are only used in special cases. Trays are fixed to steel or concrete structures using standard steel shapes, self-drilling dowels, or welding as appropriate .Cable Fixing: On horizontal trays, cables are grouped and secured every 2–3 meters. On vertical trays, each cable is fixed individually with stainless steel strips .Covers and Protection: Install covers in areas with high risk of mechanical damage. Covers should match the tray material and be secured with manufacturer-recommended clips .Safety and AccessibilityEnsure safe access to the installation area and maintain a clean workspace .Maintain a minimum 300mm clearance above or between trays for cable installation and maintenance .Electrical continuity should be established every 18 meters, and trays must be properly grounded .Workers should be trained in handling, installation, and safety procedures to prevent injury or damage .Compliance and Quality AssuranceInstallation should follow project specifications, approved method statements, and international standards such as NEMA VE1, VE2, or ARAMCO standards . QA/QC inspectors should verify that all procedures, inspections, and testing records are completed and documented . By following these steps, mechanical cable trays in Mali can be installed safely, efficiently, and in compliance with international best practices, ensuring long-term reliability and maintainability of the electrical containment system.