Trunking Cable Tray Works

Adhere to the drawings as closely as possible. The right is reserved tovary the runs and sizes of Cable Trays / Trunking and to make offsetsbut maintain as far as possible the free area of each duct work section,where necessary to accommodate conditions arising at the building. Before beginning installation in any area, examine all parts of theadjoining work onto which applicable work is to be placed. Should anycondition be found which will prevent the proper execution of the work,installation shall not proceed in that area until such conditions arecorrected by the contractor.

Earth continuity conductors shall be provided across gaps in all CableTray / Trunking runs and bolted connections.Support shall be by means of steel brackets installed at intervalsnecessary to provide a rigid fixing and to ensure that deflection doesnot exceed 5mm mid span of support when fully loaded. Treatment ofcut edges as per cut edges to be included. Supports for Tray / Trunking(spacing) shall be as per standard practice and manufacturer'srecommendations. Additional support shall be provided where the Cable Tray / Trunkingchanges direction or cables drop out of the cable tray. Dome headedbolts, nuts and washers of finish suitable to the tray shall be usedbetween trays. No extended rods to be left.The cable tray shall be installed with a 40mm minimum space betweenthe structure and the tray. All cable shall be securely fixed to the tray, work and the completeinstallation must be carried out in a neat and workmanlike mannerwithout crossovers.Cables on face-up horizontally fixed tray must be secured by use of thetie wraps where not in view. If cables are bunched or single cablesgreater than 25sq mm are installed, cleats or metal straps shall beused

Most of the cable tray systems are open, allowing efficient heat dissipation and easy access for replacement and repairs. Although typically suspended from ceilings or affixed to walls, some cable tray systems are suitable for underfloor use.