sub head- annual maintenance contract of talk back system at chanakya bhawan ( a . square make ) and replacement of various spare parts at disaster management centre , humayun road , amc of talk back system alongwith customized items installed listed as below . the inventory list installed in the building for servicing , maintenance , testing & keeping the system in perfect order , with weekly visit by the engineer with technician & helper and also whenever is required or in case of any defect in the system as per the relevant bis code etc complete to the entire satisfaction of fire officer/engineer in-charge . inventory chanakya bhawan 1 . talk back unit - 12 nos . 2 . m . s . rack consist of system - 01 no . set 3 . main junction box - 01 no . 4 . mineral insulated copper cable 2 core x 1 . 50 sq . mm - approx . 3427 mtr . 5 . glands & plain seal for 2 core x 1 . 50 sq . mm - 72 nos . 6 . cable tray - 25 mtrs . 7 . m . s . stand for m . s . rack for master talk back unit - 02 nos . 8 . plain seal for 2 core x 1 . 50 sq . mm - 42 nos . ( inventory mentioned is for indicative purpose only . however actual inventory may be seen at the respective building before quoting the rates . ) , engineer - 1 no . , technician - 1 no . , helper - 02 nos . , replacement / supplying , installation , testing & commissioning of 6 zone , voice alarm controller with usb , mp3 player ( including 6 zone button paging station ) with seamless integration facility with main fire alarm panel for voice evacuation complete as required ( bosch make ) model no . lbb 1990 , replacement / supplying , installation , testing & commissioning of pcb of bosch plena amplifier complete as required model no . lbd-1930 / lbd - 1935 , replacement / supplying , installation , testing & commissioning of cpu card of seimens epabx complete as required , replacement / supplying , installation , testing & commissioning of power supply card of seimens epabx complete as required , replacement / supplying , installation , testing & commissioning of extension card of seimens epabx complete as required , replacement/ supply , installation , testing & commissioning of talk back unit as directed by fire officer/engr-in-charge .