PROVISION OF ELECTRIC SUPPLY TO POWER CIRCUIT SYSTEM AND STABILIZER AT INCS AND SPL REP TO ELECTRICAL OPERATED DOORS AT B3, B4 AND L1 TO L6 HANGERS AT INS VAJRAKOSH UNDER GE(SB) KARWAR

Amount

Excavation in trench not exceeding 1.5 m in width and not exceeding 1.5 m in depth for laying of LT UG cables/ DWC pipes, including getting out in soft/loose soil, complete all as specified and directed.

Returning, filling in using excavated soft/loose soil, including spreading, levelling, watering, and well ramming in layers not exceeding 25 cm, complete all as specified and directed.

Removing surplus excavated material/ soil to a distance not exceeding 50 m and depositing where directed at a level not exceeding 1.5 m above the starting point, complete all as specified and directed.

S&F DWC high-density polyethylene pipes of 100/95 mm dia, with all fittings, couplers, and connecting accessories conforming to IS:16098 Part-2, for cable protection, fixed on poles/walls or laid under road crossings, etc., and making good the disturbed surfaces/areas, complete all as specified and directed

Cutting the tarmac/hard standings and excavating in trenches across the road for laying cable, including making good the excavated portion with PCC 1:3:6, type C-1, to match with the surrounding surface, complete all as directed

Supply, installation, testing and commissioning of servo-controlled voltage stabilizer of capacity 200 KVA, conforming to BIS:9815 (Part1):1994 (Second Revision) reaffirmed 2019, 3-phase, 50 Hz, naturally oil-cooled, indoor, unbalanced type, copper wound, metallic body duly powder-coated, complete with four solid cast steel bi-directional reversible detachable rollers and four lifting hooks for ease of transportation, digital display type, relay-free smooth and silent operation, with first filling of BIS-certified transformer oil up to the required level, having the following specifications: (a) Input Voltage: 360V–480V (b) Output Voltage: Stabilized at 415V ±1% (c) Rated Frequency: 50 Hz; (d) Waveform: No distortion (e) Response Time: Not to exceed 20 milliseconds (f) Sensitivity: ±1% (g) Rate of Correction: 8 Volts/second for single phase and 13 Volts/second for phase-to-phase (h) Efficiency: More than 95% (j) Type of Load: Three-phase, unbalanced type, with digital display and multi-functional meter Protections: (a) Overload/short circuit protection on input side by MCCB, 400 Amps, 3-pole, 35 kA (thermal magnetic release adjustable) ; (b) High/low voltage cut-off (c) Bypass arrangement in case of emergency through on-load changeover switch, 400 Amps, 4-pole (d) Single phase sequence change protection capacity - 200 KVA

Note: (a) The specifications of servo voltage stabilizer shall conform to BIS 9815 (Part-1):1994 (Second Revision) reaffirmed 2019, with performance requirements as per Para 9 of the standard: (i) Output voltage shall be maintained within ±1% of rated voltage irrespective of load and input voltage range (Clause 9.1). (ii) Speed of correction shall not be less than 6 V/s between phase and neutral; corrector shall be free from hunting during automatic operation (Clauses 9.3 & 9.4). (iii) Losses shall be declared for no-load and full-load at minimum and maximum input voltage, with tolerances as per Table 7 of IS 2026 (Part-1):1977; no-load current shall not exceed 5% of rated output current (Clauses 9.4 & 9.5). (iv) Efficiency shall not be less than 95% (Clause 9.6). (b) Acceptance Tests – To be carried out in accordance with Para 11.2 of BIS:9815 (Part-1) (Reaffirmed 2004), consisting of the followings:- (i) Physical Examination (ii) Insulation resistance test (iii) High voltage test (iv) Leakage current test (v) Verification of earthing provision (vi) Output voltage check (vii) No-load current measurement (viii) Measurement of no-load losses (ix) Induced voltage test (c) Type test report as per Clause 11.1 of BIS 9815 (Part 1) shall be furnished by the manufacturer for the specified capacity (200 kVA) or the next higher preferred capacity rating as per Clause 5.1 of BIS 9815 (Part 1) from a Government or NABL-accredited laboratory, for any voltage range, meeting the following performance parameters: (i) Input voltage: 360 V–480 V; (ii) Output voltage: Stabilized at 415 V ± 1% (adjustable) (iii) No-load losses: Less than 0.5%; (iv) Full-load losses: Less than 2.5% (v) Duty cycle: Continuous 24 × 7 operation ; (vi) Efficiency: More than 95% (vii) Digital display voltmeter and ammeter ; (viii) Response time: Not to exceed 10 milliseconds

Supply, fabricate, install, test and commission an outdoor type, double door, dust and vermin proof Bus bar Junction Box of suitable size made from 3.15 mm thick MS sheet, mounted on MS angle iron frame 50 × 50 × 6 mm with legs not less than 750 mm high on 150 mm thick PCC (1:3:6) type C-2 foundation with 100 mm offsets, having front and back opening with locking arrangement, finished with two coats of approved shade powder-coated paint over one coat of red oxide primer, fitted with aluminium bus bar strips 600 Amps for 3-phase 4-wire system including provision of new cable gland and lugs for existing cable connection, complete all as specified and directed, fitted with the following incoming accessories: Incoming accessories: (i) MCCB, high breaking capacity, 4-pole, 415 Volts, 35 kA breaking capacity, adjustable thermal release range 400 Amps, make: HPL / C&S / Schneider / L&T / Indoasian / GE / Havells – 01 No (ii) Digital type voltmeter and ammeter with suitable capacity CTs, LED indicator lamps, and all necessary connecting accessories

M&L for earthing complete with galvanised steel earth plate electrode 60 cm x 60 cm x 6 mm thick, buried directly in ground (earth pit not less than 2.25 m deep below normal ground level) with top edge of plate not less than 1.5 m below normal ground level, connected to galvanised iron earth strip 32 mm x 6 mm by means of galvanised iron bolts, nuts, check nuts and washers, the 32 mm x 6 mm earth lead protected by GI medium grade pipe 40 mm bore, including 40 mm thick RCC (1:2:4) cover slab reinforced with expanded metal mesh (weight not less than 4 kg/sqm) and framed with angle iron 40 mm x 40 mm x 6 mm having 6 mm dia MS bar handle, GI light grade watering pipe 20 mm bore of suitable length placed on top edge of earth plate, filling with alternate 15 cm layers of charcoal and common salt all around the plate, funnel with wire mesh, excavation and earth work in any type of soil, returning filling in and removal of surplus soil to a distance not exceeding 50 m, complete all as per Plate No. 3 of SSR-2009 Part-I and connecting to earth test point including testing on completion, all as specified and directed.

Supply and fix in replacement heavy-duty HRC fuse of capacity 32 amps, suitable for voltage range 500V to 690V, for electrically operated door panel, complete all as specified and directed.

Supply and fix in replacement door magnetic detection sensors for feedback of blast door functions, including internal reed switch in conjunction with magnet, complete all as specified and directed.

Supply and fix in replacement Variable Frequency Drive (VFD), suitable for 11 kW motor, input ratings: AC single-phase voltage 200–240V, frequency 50/60 Hz & current 13.8A/11.0A, and output ratings: AC 3-phase, 0–240V, frequency 0-400 Hz, current 6.0A/5.0A, complete all as specified and directed. Make: Yaskawa, Model CIMR-JBA0005BAA, or equivalent in ABB/Schneider/Siemens.

Supply and fix in replacement key pad with electronic lock, PCB plate embedded inside blast door, including removal of defective unit and refixing new assembly into the blast door, complete all as specified and directed.

Supply and fix in replacement contactor, 3 pole, 25 amps, miniature contactor with 1 normally closed base contact and 24V DC rated coil, suitable for 3/5 HP @ 230/440V, 3 phase complete all as specified and directed.

Supply and fix in replacement gear box, make Motrvento 6473/37-026L.7, suitable for high-torque and low-speed motor, with hydraulic oil grade 52 filling as required at site, complete with all accessories, all as specified and directed.

Supply and fix in replacement gear box supporting plate, complete with fixing bolts, complete all as specified and directed.

Supply and fix in replacement lock of drum type with cylinder lock with euro profile, alteration as per existing arrangement, complete all as specified and directed.

Supply and fix in replacement high-torque and low-speed motor used for opening and closing of blast door, capacity 0.75.0/0.90 kW, rating 3.04A, suitable for voltage range 240–280V / 420V, complete all as specified and directed.

Supply and fix in replacement Programmable Logic Control Unit (PLC module) consisting of 12 input transistors and 8 output transistors, for blast door operation, complete all as specified & directed. Make: Eaton, Model EASY 822-DC-TCX, or equivalent in L&T/ Schnieder.

Supply and fix in replacement Programmable Logic Control (PLC) expansion module unit (I/O expansion module) of existing make Eaton, complete all as specified and directed.

Supply and fix in replacement thrust bearing NTN 81112T2, as per existing, complete all as specified and directed.

JAI SHREE GOPAL ELECTRICALS (BID ID -3461966)

Shree Ayyappa Engineering (BID ID -3455876)