BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

9.4 CABLE ERECTIONConcrete lined cable trenches shall be provided within the power station. All suchtrenches shall be provided with covers to form a flush finish with the finished floorlevel. Cables shall be secured by non-corrodible cleats supporting steelwork, or ontrays. Wooden cleats shall not be used. Cables shall not be clipped or cleateddirectly to masonry. All cable supporting steelwork racks cleats trays and fixings intrenches or elsewhere shall be supplied under this contract.Where the cables are to be installed on racks, these racks shall be of galvanisedsteel angles or aluminium and designed such that the spacing and type ofsupporting cleat ensure that no undue pressure is exerted on the sheath orarmour of any cable.Cables tray shall be of the first grade perforated galvanised steel with folded sidemembers and supported on steel work or masonry is required. Segregation of thevarious services shall be achieved by use of separate trays for each voltage gradeof cable used. The design of the cable tray system shall make due allowance forthe future installation of at least 10 percent spare cables and also for theinstallation of cables supplied by others.All cables in vertical runs shall be supported to ensure that no strain due to theweight of the cable is taken by any terminating box. Each cable when erectedshall have permanently attached to it at each end, non-corrodible metal markersshowing the cable identification number, voltage, rating, size and make up.Single core cables shall be laid up in close trefoil 3-phase groups and erected inseparate non-magnetic clamps to the approval of the Board.Where cables are erected on outdoor steelwork supporters, sun shades ofapproved design and materials shall be included and erected as necessary toprotect the cables.9.5 GROUNDINGThe Contractor shall provide all grounding cable, equipment, and materialsrequired for a complete installation including the direct buried ground mat for thepower station,. This shall include, but not be limited to, all facilities for groundingof panel boards, control panels, transformers, switches, lighting poles, lightingstandards, and all electrical equipment enclosures. Two point grounding for eachequipment, panel board and steel structure shall be provided.(1) Grounding wire for ground gridHard drawn copper stranded wire in accordance with latest IEC Hard DrawnCopper wire for electrical purposes.Nominal cross sectional area: 200-sq. mm.Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)98