BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

9.2.2. 6.6 kV XLPE POWER CABLESThe single or triplex core 6.6 kV XLPE copper conductor power cable and othernecessary items for the completion of the cable system.The power cables and accessories shall be designed and constructed inaccordance with the most up-to-date experience for a system of this voltage leveland shall incorporate the latest improvements of design and manufacture for thetype of cables and accessories required.(1) The cable shall be stranded annealed copper conductor.The construction of the conductor shall be the compacted circular single or triplexcore type. The size of the conductor shall be capable to carry the rated capacity ofeach feeder and at specified site conditions without exceeding its maximumtemperature i.e. 90 0 C. The minimum size of 6.6 kV cable shall not be less than 60sq. mm.(2) InsulationThe insulation material shall be extruded cross-linked polyethylene of lowdielectric loss, high dielectric strength, low thermal resistivity and long termstability. It shall be free from contamination by oil, chemical, and moisture. Theextrusion process shall ensure that the insulation is homogeneous and free fromvoids and impurities, and it shall be dry method.(3) TerminationsThe end terminating materials shall be supplied for the termination of 6.6 kVcables.9.2.3 600 V Power CablesThe cables shall be rated 600 volts for installation in cable trays, conduits andcable ducts.All auxiliary power cable with a nominal conductor area of 60 sq. mm and aboveshall be stranded annealed copper conductor, XLPE insulated with galvanised steelwire or steel tape armour and PVC sheathed. All other auxiliary power cables shallbe stranded annealed copper conductor, PVC insulated with galvanised steel wireor steel tap armour and PVC sheathed. All auxiliary power cables shall bedesigned, fabricated and tested in accordance with the latest IEC Standard.The cables shall have copper conductor and shall be selected with dueconsideration to load requirements of each feeder and short circuit currentcapacity of the cable in order to prevent premature insulation failure. Theconductor insulation shall be numbered or colour coded.For motor circuit, the cables shall have a current carrying capacity of at leastequal to 115% of the full load current rating of the motor after application of theappropriate derating factors.Cable supports shall be provided for the cables and shall be at least one cablesupport bracket per vertical section for interconnection between adjacentsections. The minimum size of power cable shall be of 10 sq.mm.Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)95