MODERNISATION AND UPGRADATION OF E/M INSTALLATIONS AT VARIOUS LOCATIONS AT AFS UNDER GE (AF) JORHAT

Materials and labour for Design, fabrication, Supply, Installation, testing & commissioning of Intelligent LT street light panel outdoor type, double door (CPRI tested design), enclosure minimum thickness 2.0 mm CRCA sheet steel (base frame 3.0 mm MS) and dimensions 900 mm × 1100 mm × 400 mm with both sides extensible, dust and vermin proof, fully compartmentalized, front operated, double door, factory made. Having bottom frame made of 50 mm × 50 mm × 6 mm angle iron frame with 4 Nos. legs of 0.50 m size each with cable entry and exit circular holes with heavy-duty brass cable glands and neoprene gaskets, duly fixed in ground with necessary PCC foundation (1:2:4) Type B-1.Complete with danger notice plate of 1.6 mm thick mild steel sheet vitreous enamelled (white) with letters, figures and conventional skull and bones in signal red colour conforming to IS 2551, fixing lugs, bolts, screws, etc., for 20 kW connected load on 415 V, 3-Phase, 4-Wire, 50 Hz AC supply, pre-treated and powder-coated weatherproof IP-65 enclosure.

BUS BARS: 4-Strip high conductivity aluminium busbars of minimum 63 Amps continuous capacity of suitable cross section for achieving required current density (not exceeding 1.0 A/sq.mm) with heat-shrinkable coloured sleeves (R, Y, B, Black) including suitable size SMC/DMC flame-retardant supports and their spacing to withstand dynamic short-circuit stresses, complete. (a) INCOMER MCCB: 1 No. 40A, 4-Pole thermal-magnetic type MCCB with adjustable overload (70% to 100% / 0.7 to 1.0 × In) and fixed short-circuit protection, current-limiting type conforming to IS/IEC 60947-2, rated operational voltage 415/440V AC, insulation voltage up to 690V AC, impulse withstand voltage 8 kV, breaking capacity Icu = Ics = 50 kA, with extended rotary handle, door interlock mechanism, and terminal spreader links. (b) METERING & CTs: 1 No. Digital Three-Phase Multifunction VAF Meter (Class 1.0) with mode selection button (Auto / Manual) and push-button type switches, complete with 3 Nos. Current Transformers (CT) ratio 50/5A, Class 1.0, 5 VA burden conforming to IS 2705. (c) POWER CONTACTOR: 1 No. 40A, 4-Pole (4P) power contactor conforming to IS/IEC 60947-4-1, AC-1 duty for power circuit (rated operational voltage Ue up to 690V AC, rated operational current 40A at 415V AC-1), control coil voltage 220V/240V AC 50 Hz (or 24V AC as per control circuit), complete with auxiliary contacts.

(d) ASTRONOMICAL TIME SWITCH: 1 No. Astronomical Time Switch (reputed approved make) with real-time astronomical dusk-to-dawn programming, battery backup, and Auto/Manual bypass selector switch. (e) PHASE INDICATION LAMPS: 3 Nos. Phase indication LED lamps (Red, Yellow, Blue) protected with 3 Nos. 2A, 10 kA single pole backup MCBs. (f) CONTROL TRANSFORMER: 1 No. Control transformer 415V / 24V AC (or 230V / 24V AC), single-phase, dry-type step-down transformer of minimum 100 VA capacity, Class 'F' insulation conforming to IS 12021 / IS 2026, including primary and secondary protective fuses/MCBs. (g) SURGE PROTECTION DEVICE (SPD): 1 Set 4-Pole (3P+N) Surge Protection Device conforming to IEC 61643-11 / EN 61643-11 Type 2 (Class II) for protection against indirect lightning and switching surges, complete with built-in health/status indicator, response time < 25 ns, maximum discharge current Imax = 20 kA, nominal discharge current In = 10 kA, and maximum continuous operating voltage Uc ≥ 340V AC. (h) OUTGOING MCBs: 3 Nos. 32A, Double Pole (DP), 10 kA breaking capacity, 'C' curve MCBs conforming to IS/IEC 60898-1. Complete with internal wiring with FRLS copper conductor, copper earth terminal bus, testing and commissioning, all as specified and as directed.

Material and labour for earthing complete with galvanised steel earth plate electrode, size 600 mm × 600 mm × 6 mm thick, buried vertically in ground with top edge of plate not less than 1.50 m below normal ground level (depth of pit not less than 2.25 m below ground level), surrounded with minimum 150 mm thick alternate layers of charcoal/coke and common salt, connected to 4 mm dia (8 SWG) GI wire / earth lead enclosed in 25 mm bore medium grade GI protection pipe up to a length of 7.50 m, complete with 20 mm bore medium grade GI watering pipe with funnel and brass wire mesh, test link, GI bolts, nuts and washers; constructing masonry/PCC (1:2:4) type B-1 inspection chamber with 50 mm thick RCC (1:2:4) type B-1 cover slab reinforced with 8 mm dia TMT bars @ 6 Nos each way, set in MS angle iron frame 40 mm × 40 mm × 6 mm with lifting handles; earthwork in excavation in any type of soil, returning, filling in, ramming, and removal of surplus spoil to a distance not exceeding 50 m; connecting earth lead to Main Switch Board / Panel / DB, and testing on completion, all as per Electrical Plate No. 3 of MES SSR Part I, complete all as specified and as directed.

Excavating in trenches not exceeding 1.50 m in width and not exceeding 1.50 m in depth, for foundation, laying cables, pipes, drains, etc., and getting out, in hard/dense soil, including trimming and dressing sides, levelling and ramming bottoms, initial lead up to 50 m and lift up to 1.50 m, complete all as specified and as directed.

Returning, filling in and ramming of selected excavated soil (soft/loose soil) around foundations, pipes, or in cable/pipe trenches, including depositing in layers not exceeding 25 cm thick, spreading, levelling, watering, and well ramming/consolidating to achieve optimum density, complete all as specified and as directed.

Removing excavated materials (soil/earth) to a distance not exceeding 50.00 m (lead) and depositing where directed at a level not exceeding 1.50 m above the starting point (lift), including loading, transporting, unloading, spreading, and levelling off neatly, complete all as specified and as directed.

Material and labour for providing and laying dry sand cushioning (river/pit sand free from organic matter, pebbles, and sharp stones) in trenches as bedding and surround cover for underground cables, including filling, levelling, light ramming, and consolidating around cables, complete all as specified and as directed. Note: For the purpose of measurement and payment, the consolidated (rammed/punned) thickness of sand cushioning shall be taken as 18 cm, and volume calculated based on authorised trench width and length, with no deduction made for cable volume.

Material and labour for supplying and laying burnt clay common building bricks, sub-class 'B' (old size / modular size conforming to local availability), designated class 7.5 or class 5.0, dry laid flat or on edge across/along the cable alignment over sand cushion as protective mechanical cover to underground cables in trenches, complete all as specified and as directed.

Material and labour for supplying, laying and testing LT cable, 1100 V grade, stranded aluminium conductor, XLPE insulated, heavy duty, galvanized steel wire/strip armoured, conforming to IS 7098 (Part 1), size 4 core 16 sq.mm, laid in trenches, or pulled through pipes/ducts/sleeves including necessary uncoiling, complete all as specified and as directed. Note: Earthwork excavation, sand cushioning/bedding, and refilling in trenches shall be measured and paid for under relevant separate items.