PROVN OF ISOLATION TRANSFORMER AT X-RAY DEPT OF 163 MIL HOSP UNDER AGE (I) DARJEELING

Amount

Supply, installation, testing and commissioning of Isolation transformer, three phase, 50Hz, copper wound, oil cooled of capacity 50 KVA with all standard fittings & accessories including first fill of oil complete with following specifications and as per manufacturers instructions :- (i) Input voltage : 415 V AC, 3 phase/4wire (ii) Input-Output voltage Ratio : (1:1) (iii) Freequency : 50 Hz (iv) Vector Group : Dyn-11 (v) Cooling : ONAN (vi) Insulation : Class A (Resistance not less than 1000M Ohm) (vii) Core : High grade CRGO material (viii) Winding : Paper covered electrolytic grade copper strip or synthetic enameled copper conductor. (ix) Efficiency : Not less than 92% (x) : Impedence : 3-4% (xi) : Breaking strength : 1.5 KV for 60 sec

Supply, installation, testing and commissioning of Isolation transformer, single phase, 50Hz, copper wound, air cooled of capacity 5 KVA with all standard fittings & accessories including first fill of oil complete with following specifications and as per manufacturers instructions :- (i) Input voltage : 240 V AC, Single phase (ii) Input-Output voltage Ratio : (1:1) (iii) Freequency : 50 Hz (iv) Cooling : Air Cooled (v) Insulation : Class F (Resistance not less than 1000M Ohm) (vi) Winding : Paper covered electrolytic grade copper strip or synthetic enameled copper conductor. (vii) Efficiency : Not less than 92% (viii) : Impedence : 3-4% (ix) : Breaking strength : 1.5 KV for 60 sec

Material and labour for maintenance free tripod chemical earthing with high tensile low carbon steel rod electrode of 3 mtr length & 17.2mm dia with minimum 250 micron molecularly bonded copper on the outer surface placed in bore minimum 150mm dia upto 3 mtr deep with and including necessery excavation in any type of soil or rocky soil. The electrode to be shrouded with back fill compound (carbon based conductive concrete type) having resistively not less than 0.12 Ohm-mtr, highly conductive, hygroscopic, non magnetic, non corrosive and environment frendly. Top end of the electrode to be housed in polypit chamber with cover of size 300x300x300mm. Three earth pit to be laid on triangular manner having minimum 3 mtr distance from each other and to be interconnected with copper strip of size 20x3mm burried under groung and filled with back filled compound. All inter connection joints should be connected by means of brass nut-bolt and also brazzed in joints to ensure conductivity. Note :- (i) Earth resistance of the tripod earthing system should not be less than one Ohm. (ii) Back-fill compound shall not be mixed with any soil while pouring in bore hole and minimum 2 bags (each bag of 25 Kgs) shoild be filled in each bore hole. (iii) The earthing shall be carried out strictly in presence of OEM and Engr-in-Charge. (iv) On completion earth testing report to be submitted to Engr-in-Chargte duly signed by OEM and User. (v) Earth strip beyond Earth point (excluding interconned strip) will be measured and paid seperately iunder relevant item here-in-after.

Earthing complete with galvanized steel earth plate electrode 600x600x6 mm thick buried directly in ground (earth pit not less than 2.25 m deep below normal ground level) with top edge of the plate not less than 1.5 m below normal ground level connected to galvanized earth strip 32 x 6 mm (up to 7.5 m in length from earth plate ) by means of bolts and nuts checknuts and washers of galvanized iron or steel all as specified and directed.

All as per item Ser No. 4 above but with GI earth wire of 4.0mm

Supply & fixing single core PVC insulated copper conductor 25 Sqmm for connection with LT control panel and transformer complete all as specified and directed.

All as per item Ser No. 6 above but 6.0 Sqmm

Note 1:- (Applicable for all parts/items) : The biidders/contractors are advised to read tender document, all drawings & all corrigendum/ amendments and general condition of contracts before entry/quoting the rates. Note 2:- Attention to bidder is hereby invited to upload revised BOQ if published during their bid submission. Uploading of incorrect/ pre-revised BOQ shall be treated as non bonafide and rejected.

GEETA CONSTRUCTION

Darjeeling Enterprises

Damdoo Bhutia

M/S TSHERING BHUTIA

BIMAL BHATTRAI