BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

(2) General CommunicationWhen the other party answers the paging, general communication is establishedby releasing the page button. Simultaneous two way conversations shall bepossible on one same channel.(3) Emergency Alarm1,000 Hz alarm note shall be sound from all speakers by pushing the buttonlocated on the control panel and desk in the central control room14.3.3 EQUIPMENT(1) HandsetFlush typeIndoor wall typeOutdoor wall type: 5 sets:12 sets: 7 setsHandsets installed indoors shall be of noise-proof type.(2) Speaker Set15 W outdoor type :10 sets5 - 10 W indoor type :13 setsAll speaker shall be able to adjust their output.(3) Amplifier CubicleAll Silicon transistor amplifiers shall be mounted in the amplifier cubicle. Theamplifiers shall be suitable for the driving of the above speakers all together andshall be divided into adequate capacity.One set spare amplifier shall be furnished and it shall be put into operationautomatically when the normal use amplifier fails.(4) Control Panela. Relay PanelRelays shall be provided for the starting and stopping amplifier and toestablish the commanding talk from the handsets. The talking shall be indicatedwith a lamp on all handsets. The relays shall be of semi conductor static type orwire spring relay with sulphuric acid proof type.b. Change-over PanelWhen one set amplifier fails, the failed amplifier's circuit shall be transferred tothe spare amplifier's circuit with relays. Manual change-over switch shall also beprovided.c. Amplifier ProtectionGhorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)126