CA NO. GE (I) (AF)/SHL/ 2021-22 REPAIRS/MAINTENANCE OF LT UG CABLES, LT PANELS/FEEDER PILLAR BOXES AND OTHER ALLIED WORKS AT AF STATION AT EAC (U), AF UNDER GE (I) (AF) SHILLONG

Amount

Excavation in trenches in soft / loose soil, not exc 1.5 m wide and n. exc 1.5 m depth or n exc 10 Sqm on plan & getting out, for laying of cables, foundations of poles, struts, stays etc. and getting out including triming and forming bottom surface complete, all as directed.

Returning, filling in, including spreading, levelling, watering and well ramming in layers not exceeding 25 cms thick in soft / loose soil back in trenches after cables have been laid and tested, poles, stays , struts have been erected and tested complete all as directed.

Removing excavated materials to a distance not exc 50m and depositing where directed at a level not exc 1.5 m above the starting point in soils complete all as directed.

Taking out old unserviceable LT UG cable and Supplying, Fixing/laying, jointing and testing and commissioning, LT under ground cables, 1100 Volts grade, XLPE insulated, armoured heavy duty electric cable with stranded aluminuim conductors, laid in trenches, ducts/fixed on poles/walls/laid under roads/paths/drains/culverts or encased in GI pipe complete all as specified and directed of following sizes:-

2 core 10 Sqmm

4 core 16 Sqmm

3.5 core 25 Sqmm

3.5 core 35 Sqmm

3.5 core 50 Sqmm

3.5 core 70 Sqmm

3.5 core 95 Sqmm

3.5 core 120 Sqmm Notes :- (a) Excavation & earth work, GI pipe for laying of cable, sand cushioning, cable protection cover shall be measured and paid for seprately under respective items of the schedule. (b) Old serviceable cable cover obtained from taking out of cable shall be re-used under respective item of the BOQ.

M & L in replacement for outdoor type heat shrinkable cable end termination jointing kit for LT 1100 Volts (Earthed) grade cable of following size complete with jointing material and accessories complete all as directed :-

25 to 50 Sqmm, 3.5 core

70 to 150 Sqmm, 3.5 core

S & F in replacement Galvanised steel tubing light grade for protection of under ground cable on poles / walls/under road crossing/laid in trenches etc conforming to IS-1239 for following bore complete all as directed:-

50 mm bore

100 mm bore (Note : Excavation & earth work shall be measured & paid separately under respective items of this Schedule).

M & L for dry sand cushioning to PVC under ground cable with screened and washed sand and punning to provide a required cover complete all as specified and directed. Note :- Thickness after punning shall be considered for payment.

M & L for brick protection for UG XLPE cable with burnt clay old size sub class 'B' bricks laid dry and flat abutting each other with gaps between adjacent brick not more than 10mm and width equal to length of brick in trenches across the cable complete all as directed.

M&L for repairing LT panels/ LT feeder pillar box (Bus-bar system) with dismantling of bus-bar strips 4 Nos from insulators & disconnect/removing all incoming/outgoing cables/wires connections from bus-bar, change over etc, welding of sheet metal enclosure as required. Dressing/cleaning of bus-bar strips for removing sulphating, carbonisation, scales, dirt etc. Thoroughly, re-mounting on insulators rigidly, wrapping up of PVC insulation tape entirely over the bus-bar strips maintaining red, yellow, blue for phase & black for neutral. Dressing up of all incoming/outgoing cables/wires with replacement of aluminium cable lugs nuts/bolts properly crimpling/socket ting, re-fixing the cable glands (duly dressing of cable armoured) for all incoming/outgoing cables, change over etc. all as directed & specified by the Engr-in-Charge of following sizes:-

1200mm x 1500mm x 500mm

1200mm x 900mm x 500mm / 1000mm x 800mm x 500mm

S & F in replacement following components/parts in existing LT panel boards complete all as directed:-

MCCB four pole 63 Amp confirming to IEC 60947-2 & IS – 13947-3 thermal magnetic release and adjustable over load setting 0.8 – 1.0 x In and adjustable short circuit setting 6 – 10 x In and rupturing capacity 16 KA at 415 V AC , 50 Hz

MCCB four pole 125 Amp confirming to IEC 60947-2 & IS – 13947-3 thermal magnetic release and adjustable over load setting 0.8 – 1.0 x In and adjustable short circuit setting 6 – 10 x In and rupturing capacity 16 KA at 415 V AC , 50 Hz

MCCB four pole 200 Amp confirming to IEC 60947-2 & IS – 13947-3 thermal magnetic release and adjustable over load setting 0.8 – 1.0 x In and adjustable short circuit setting 6 – 10 x In and rupturing capacity 25 KA at 415 V AC , 50 Hz

MCCB four pole 250 Amp confirming to IEC 60947-2 & IS – 13947-3 thermal magnetic release and adjustable over load setting 0.8 – 1.0 x In and adjustable short circuit setting 6 – 10 x In and rupturing capacity 25 KA at 415 V AC , 50 Hz

MCCB four pole 400 Amp confirming to IEC 60947-2 & IS – 13947-3 thermal magnetic release and adjustable over load setting 0.8 – 1.0 x In and adjustable short circuit setting 6 – 10 x In and rupturing capacity 36 KA at 415 V AC , 50 Hz

Ammeter digital type 0-400 Amps, of class I accuracy, 0.5 VA burden. Make : Securemeters/Schneider/L&T

Digital type Voltmeter 0-500 volts, 3 Phase, 4 digit, high resolution LED type. Make : Securemeters/Schneider/L&T

Digital type Frequency meter CI 0.2, 3 Phase, 4 digit, high resolution LED type.

Indicator lamp with holder key flush mounted, LED type Red, yellow, blue.

Disconnecting carefully all incoming and outgoing cables from manual draw out type Air Circuit Breaker of 630 Amps rating, breaking capacity 50 kA, carrying out complete overhauling and servicing, re-assembling existing serviceable parts/new replaced spare parts/components including re-connecting all incoming and outgoing cables & necessary testing and commissioning complete all as specified and directed. Notes : (a) Cost of labour for replacement of new spares/component shall be deemed to be included in quoted rates. (b) New spare parts/components shall be measured and paid as Supply only under respective items of BOQ here-in-after. (c) Cost of cosumables like Oil/Grease/Lubricants shall be deemed to be included in quoted rates. (d) Overhauling and servicing of ACBs to be carried by engaging authorised service engineer of manufacturer.

Supply only following spares/components of manual draw out type Air Circuit Breaker of 630 Amps rating, breaking capacity 50 kA complete all as specified and directed :-

Vertical terminal adaptor of rating 400-1250 S1/800-1000 C. Model & Make : Cat Part No. SL93281OOOO of Make L & T or equivalent model of makes listed in list of Makes.

LED indicating lights

Lockable trip push button (LTPB) type BB . Model & Make : Cat Part No. SL93148OOOO of Make L & T or equivalent model of makes listed in list of Makes.

CT for SR 18G/SR18G + D 630 S1 Fix and Draw out . Model & Make : Cat Part No. SL37495OOOO of Make L & T or equivalent model of makes listed in list of Makes.

Earth fault release (For DN1) type EF1 (10%, 20% In) . Model & Make : Cat Part No. SL91340OOOO of Make L & T or equivalent model of makes listed in list of Makes.

Shunt release type EA : 110V DC . Model & Make : Cat Part No. SL92718O1OO of Make L & T or equivalent model of makes listed in list of Makes.

Under Voltage release Type MV : 240V AC . Model & Make : Cat Part No. SL92720BOOO of Make L & T or equivalent model of makes listed in list of Makes.

Automatic transfer controller Type AuXC-2000 controller . Model & Make : Cat Part No. ATC2000OOOO of Make L & T or equivalent model of makes listed in list of Makes. {Notes : (a) Genuine spare parts/components as originally fitted in ACB shall only be provided during repairs/replacement. (b) These genuine spare parts/components shall be procured through OEM/their authorised distributers or dealers/service frenchise/service stations (Authosised to deal in genuine spare parts/components)

M & L for preparation of external and internal old painted steel surfaces of LT Panel boards/LT feeder pillar boxes/Bus Bar Chambers etc in position by removing/scrapping old disintegrated and deteriorated paint and painting two coats of synthetic enamel paint by spray gun over a coat of red oxide zinc chromer primer including writing letter complete all as specified and directed.

M & L for earthing complete with galvanized steel earth plate 60 cm X 60 cm X 6 mm thick buried vertically in ground to depth not less than 2.25 metres deep below ground level, with top edge of earth plate not less than 1.5 m below ground level, connected to galvanized iron strip 32x6mm earth lead by means of bolts, nuts, check nuts and washers of galvanized iron or steel besides welding at all joints as shown in drawing and including excavation and earth work, GI pipe light grade 40mm bore for protection of earth wire and connected to continous earth lead on pole/test point, supplying and laying charcoal dust common salt PCC 1:2:4 type B1, chamber and MS angle iron frame 40x40x3mm and RCC cover 40mm thick (1:2:4) type B1 using 20mm graded stone aggregate reinforced with 6mm dia round bars @ 75mm C/C both ways with MS handle 12mm dia, PGI/CI funnel and wire mesh, 20mm dia GI pipe medium grade for watering all as shown in electrical plate No 5 on srl page No 497 of SSR Part I (2009) drawing and connection to earth test point including testing and including dismantling and taking out old earthing complete all as specified and directed. Note : (i) The cost of earth lead /strip and GI pipe for protection of earth lead/strip upto 7.5m is included in the quoted rate. (ii) The cost of excavation, earth work is included in the quoted rate.

M & L for Earth continuity conductor of 32x6mm galvanised iron earth strip fixed to wall on batten or recess or chases or buried in ground or drawn in conduit/pipe or fixed to poles or any other indicated situation for loop earthing etc, complete all as directed.

OUTGOING (a) MCCB four pole 250 Amp confirming to IEC 60947-2 & IS – 13947-3 thermal magnetic release and adjustable over load setting 0.8 – 1.0 x In and adjustable short circuit setting 6 – 10 x In and rupturing capacity 36 KA at 415 V AC , 50 Hz complete - 02 Nos. (b) MCCB four pole 125 Amp confirming to IEC 60947-2 & IS – 13947-3 thermal magnetic release and adjustable over load setting 0.8 – 1.0 x In and adjustable short circuit setting 6 – 10 x In and rupturing capacity 25 KA at 415 V AC , 50 Hz complete - 02 Nos. (c) Two spare compartment. Notes:- (a) All armoured cables shall enter through bottom of the feeder pillar duly glanded and socketed and connected to MCCB/cable terminal. Cost of glanding socketing etc are deemed to be included in the unit rate of feeder pillar. (b) All the out going cable shall be terminated in bakellite cable connector and shall be duly glanded and socketed. (c) All the cables (power and control wiring ) should be terminated duly socketed with heavy duty tinned copper lugs, GI bolts/screws nuts, flat washers and spring washers as required. (d) White acrylic marker plate (for feeder / switch marking ) to be provided with black lettering by heat press machine as indicated in drawing and to be pasted over the panel door/near the cable connector with high quality adhesive. (e) The cost of platform/foundation with PCC shall deemed to be included in the quoted rates. (f) The consolidated rate for Srl No. 16.00 & 16.10 shall be quoted against Srl No. 15.00 of BOQ.

M/S AKC ENTERPRISE

mahinder electricals

JAIN ELECTRICALS

M/S DEEDAR ENTERPRISE