BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

Protection for the amplifier shall be provided according to the manufacturer'sstandard.d. Test deviceAmmeter for measuring the emitter current of each transistor and changeoverswitch and power source voltmeter shall be provided on the front of the panel.Red lamps for the indication of operation and orange lamps for the warming shallbe provided on the front panel.e. Terminal blockTerminal block shall be provided in order to connect the incoming cables fromhandsets and speakers.14.3.4 LOCATIONS OF HANDSETS AND SPEAKERThe location of handsets and speakers will be advised by the Board after award ofthe Contract.14.4 COAXIAL CABLECoaxial cables shall be of stranded copper conductor (7/0.4 mm), solid dielectriccoaxial type with polyethylene insulated, annealed copper wire braided and withPVC sheathed.The electric characteristics at 20 deg. C shall be as follows:Dielectric strength (for 1 minute)Between conductor and outer conductorInsulation resistanceAttenuationImpedance (nominal): 6KV AC: More than 10 Mohms / km: 3.2dB/km at 3OOkHz: 77ohms at 300 kHzSufficient length of the coaxial cables and cords with all the necessary cableconnectors shall be supplied to each station for making connections between thecoupling capacitors and the coupling filters, the coupling filters and the lineprotective devices, and the line protective devices and the PLC telephoneterminals.14.5 POWER SUPPLYThe communication facilities to be furnished shall be operated by a 240 V, 50 Hzsingle phase AC (with UPS) and/or DC 50 V. These power supply facilities shall beprovided by the Contractor.DC 50 V system shall be designed and provided based on the followingrequirements:Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)127