PROVN OF RING MAIN UNIT RMU AND CONNETED WORK AT TRANSMITTER SUBSTATION AT AF STN CARNICOBAR.

Amount

M/L for Demolition of path /concrete in ground floors and pavings n exc 15 cm thickness (below or above ground level) .complete all as specified and as directed.

M/L for cement concrete type B-2, 1:2:4 (40mm graded aggregate) 100mm thick complete all as specified and as directed.

Supply, laying, testing and commissioning Cable jointing kit for 11 KV (Earthed) grade cable for indoor termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 50 sqmm to 95 sqmm

Supply, laying, testing and commissioning Cable jointing kit for 11 KV (Earthed) grade cable for outdoor termination heat shrink type joint complete with jointing material and accessories suitable for 3 core XLPE armoured aluminium conductor cable of size 50 sqmm to 95 sqmm.

Supply, laying, testing and commissioning XLPE insulated, screened, PVC bedded, galvanised steel strip or wire armoured, electric power cables (heavyduty) with aluminium conductor, 11000 volts, grade 3 core, cross sectional area 95 sq. mm complete all as specified and directed.

Supply, installation, connecting, testing and commissioning outdoor type 11 KV, 630 Amps, Extensible on both side, outdoor fixed type (IP54), RMU (Ring Main Unit) 5 way comprising of 05 Nos 630 Amp Vaccum circuit breaker. Incomer 02 Nos & 03 Nos outgoing. Inside robotically/ manually/TIG welded sailnless steel 304 (Non ferrite Non magnetic Grade) filled with SF6 gas at suitable pressure in accordance with the IEC, IEC-62271-103, tank having min thickness 3 (+/-) 0.5 mm having IP 67 degree of protection. The RMU tank shall provide full insulation, making the switchgear insentive to the environment with degree of protection of IP67. The RMU shall be suitable for operations at a height 1000m above sea level and at 40 degree ambient temperature without any derating. RMU should be provided with internal busbar as well as earthing busbar should be copper, padlock provisions & complete all accessories. The RMU shall be type tested for internal arc test of 21KA/0.1 Sec as per IEC-62271-200. RMU shall be equipped with site replaceable bushing. The earthing busbar shall be provided inside the each cable compartment for solid earthing of cable sheilds. The outer enclosure main door should cover entire part of the switchgear including front cover and cable doors for providing complete IP54 protection including raised foundation of suitable size, minimum 50cm above and 01 meter below the natural ground level all as per manufacturers drawing. The unit shall include the following along with all necessary accessories and fittings as required at site all as speciffied & directed.

(a) Incommer:- SF6 insulated motorized Breaker module consisting of following accessories:- (i) 11 KV, 630 Amp fixed type Vaccum Circuit Breaker module for making and breaking of fault current along with disconnector + Earth switch and interlocking facility. (ii) Short time current-21KA/3 Sec, breaking capacity 52.5 KA. (iii) Auxiliary contacts-01 NO+ 2 NC & Auxiliary contact on earth switch is 1 NO + 1 NC. (iv) Stored energy machnism with manual / motorized spring charging. associated closing/ tripping coils, integrated non removable spring charging operating handle and ON/OFF push buttons mechnically latched to the mechanism. (v) Interlocked, arc prrof cable box for front termination of the cable suitable door arrangement (IP 54+ IP3X & IP2X) safety interlocked to prevent access to cable termination in live condition. (vi) Numarical based self powered OC + EF protection relay, providing over current (Min setting 20%). Earth fault (Min setting 10%).

(vii) Resign cast, Ring core CTs of suitable capacity for protection (ACC.CI, 5P10). 2.5 VA, incommer 100/1 & outgoing 50/1, insulatted away from bushing to prevent saturation of core -set of 3 No. (viii) Potential transformer with HT fuse on primary ide and MCB on secondary side for protection and primary voltage 11000 V3v & secondary voltage 110 V3v with burden winding 5 VA, class of winding 1:10. (ix) Digital multi function meter with Rs-485 port (A,V, KW, KVA, KWH, PF) etc. (x) Suitable site replaceable cable busings suitable not beyond 300mm from cable cover to allow ease of access for installation/ testing/ replacement purpose. (xi) Self interlocking mechnism between door, earth swich, disconnector and VCB. (xii) Capacitive voltage indication fixed type system. (xiii) Mchnical indications for breaker ON, OFF, Earth, Spring charged- Discharged. (xiv) Mechanical interlock between incomers. (xv) Battery 24 Volt ,7AH along with battery chargers.

(b) Outgoing:- SF6 insulated motorized Breaker module consisting of following accessories:- (i) 11 KV, 630 Amp fixed type Vaccum Circuit Breaker module for making and breaking of fault current along with disconnector + Earth switch and interlocking facility. (ii) Short time current-21KA/3 Sec, breaking capacity 52 KA. (iii) Auxiliary contacts-01 NO+ 1 NC. (iv) Stored energy machnism with manual / motorized spring charging. associated closing/ tripping coils, integrated non removable spring charging operating handle and ON/OFF push buttons mechnically latched to the mechanism. (v) Interlocked, arc prrof cable box for front termination of the cable suitable door arrangement (IP 54+ IP3X) safety interlocked to prevent access to cable termination in live condition. (vi) Emergency trip push button.

(c) Additional equpment delivered seperately or mounted seperately:- (i) Operating handle for manual Isolator/Disconnector/ Earthing operation-01 Nos (ii) Cable Boots - 1 set per Feeder (iii) Operation and Maintenance manual- 01 No

Supply and laying double wall corrugated pipe (DWC) conforming of size 180mm outer dia and 152 mm inner dia complete all as specified and as directed

Earthing complete with galvanised steel earth plate electrode 60 cm x60 cm x 6 mm thick buried directly in ground ,(Earth pit not less than 2.25 meter deep below ground level) with top edge of plate not less than 1.5 meter below normal ground level ,connected to and including galvanised iron earth wire 32 X 6 mm by means of nut, bolts, check nuts and washers of galvanised iron or steel and provision of charcoal dust and common salt packed all around the earth plate including necessary excavation and earth work in any type of soil and testing complete all as specified and directed and shown in electrical plate number 3 of MES SSR part-I(2009) Note: Unit rate quoted shall be deemed to be included the following (a) Excavation and earth work for drilling hole for electrode in any type of Soil. (b) PCC pit in cement concrete 1:2:4 type B-1, Pre cast RCC cover with suitable handle 40 mm thick in PCC 1:2:4 type B-1, reinforced with welded steel wire fabric weighing not less than1.87 Kg/ Sq meter. (c) Funnel with watering pipe of GI 20 mm nominal bore light grade and lugs etc complete all as specified and directed (d) 40 mm nominal bore medium grade GI protection pipe 7.5 meter long for protection of earthing lead complete all as specified and directed. (e) Requisite quantity of common salt and charcoal. (f) Testing of earthing.

Surface dressing n.exc 15 cm deep in soft/loose soil all as specified and as directed .

Excavating in trenches n.exc. 1.5m wide and n.exc. 1.5m in depth for foundation etc or for shafts, wells, cesspits, manholes pier holes etc. n exc. 10 Sqm on plan and n exc. 1.50m in depth and getting out soft/loose soil all as specified and as directed .

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

Removing excavated material (soil) exc 50 m n.exc 250 m and depositing where as directed at a level n.exc 1.5 m above the starting point complete all as specified and as directed.

Excavating in post holes (or similar holes) in soft/loose soil each n. exc 0.5 cum getting out, returning filling in and ramming earth or broken rubble mixed with earth around in layers not exceeding 25 cm. trenches n.exc. 1.5m wide and n.exc. 1.5m in depth for foundation etc or for shafts, wells, cesspits, manholes pier holes etc. n exc. 10 Sqm on plan and n exc. 1.50m in depth and getting out soft/loose soil.

M&L for cement concrete type C-2 1:3:6 (40 mm graded aggregate) in foundation filling and mass concrete.

M&L for cement concrete type D-2 1:4:8 (40 mm graded aggregate) in foundation filling and mass concrete.

M&L for Pre-cast cement concrete block masonry with solid blocks using type C1(1:3:6) (20mm graded aggregate) ,size exc 10cm in width and setting in cement mortar 1:6 complete all as specified and directed.

M & L for rendering 15mm thick in cement mortar 1:6 on fair faces of brick work or concrete surfaces on wall complete all as specified and directed.

M&L for hard core of broken stone or boulder of gauge not exc 63 mm deposited, spread, and levelled in layers not exc 15 cm thick each, watered and rammed to true surface complete all as specified and as directed.

M&L75mm thick PCC 1:4:8, type D2, using 40mm graded aggregate as in sub base of floor complete all as specified and directed.

M&L 100mm thick cement concrete 1:2:4 type B-2 using 40 mm graded stone aggregate in floors, laid in panels and finished even & smooth without using extra cement complete all as specified and directed.

S&F steel work in tabular truss including special shaped washer etc complete using ERW or induction butt welded tubes confirming to IS-1161-1979 of grade St-240 complete all as specified and as directed.

M&L Mild steel plates (plain or chequered) channels, square cut or notched (ordinary and counter sunk) forming holes, without any attachment Fe 410-W (Gde-250) quality A complete all as specified and directed.

S&F prepainted galvalume aluminium zinc coating GI based corrugated steel sheet 0.50 mm thick of any colour having tensile strength 550 MPA as in roof covering in roof covering /cladding to wall, fixed with self tapping screws complete all as specified.

S&F prepainted galvalume aluminium zinc coating GI based plain steel sheet 0.50 mm thick of any colour having tensile strength 550 MPA as in roof covering in roof covering /cladding to wall, fixed with self tapping screws complete all as specified.

M&L for preparation of new or previously untreated steel surfaces of any description not otherwise described over 10cm in width or girth and applying two coats of synthetic enamel paint (ordinary tint) over a coat of red oxide primer complete all as specified and as directed

M&L preparing new plastered surfaces and applying two coats of cement base paint on wall over a coat of primer complete all as specified and directed.

OPS Associates (BID ID -3222894)

Tropical Refrigeration (BID ID -3222828)

A. R. ELECTRICALS (BID ID -3222701)

SKV Engineering (BID ID -3222780)

CHANDER SEKER ENTERPRISE (BID ID -3222791)