IMPROVEMENT OF CERTAIN ELECTRICAL SUB STATION BLDGS AT NAVAL DOCKYARD, VISAKHAPATNAM UNDER GE (I) DM VISAKHAPATNAM

Amount

Supply & fix in replacement of change over switch alongwith enclosure 250A, 4 pole, 415 Volts complete all as specified and directed . Make :- Schneider/Havells or equivalent.

All as per item No. 1.00 above, but 400 Amps capacity.

All as per item No. 1.00 above, but 630 Amps capacity.

S&F LED flood light fittings 350 watt incl dismantling taking down unsv one complete all as specified and directed. Make :- Schneider/Havells or equivalent.

S&F LED flood light fittings 250 watt incl dismantling taking down unsv one complete all as specified and directed. Make :- Schneider/Havells or equivalent.

S&F timer enclosure complete with timer Analog time switches heavy duty of 230V 50 Hz, power contactor 3 Phase MNX18, 415V, 63 Amps, MCB TPN 10 KA 63 A withh rotary switch with connector for incoming and outgoing cable entry duly fixed on wall/panel incl taking out old one complete all as specified and directed. Make :- Schneider/Havells or equivalent.

M&L for MS chequered plates as per existing sizes and thickness both side lifting handle as per existing one incl painting of one coat red oxide primer and two coat of black bituminius paint, incl necessary PCC work as per site requirement and taking out of old unsv chequred plate complete all as specified and as directed.

M&L for painting of both side surface of MS cable trench cover using one coat of black bituminius paint after preparation of surface complete all as specified and as directed.

M&L for cleaning of cable duct of size 1.2X1.0m by removing out all mud, soil waste material and disposal of waste material to nearst garbage bin and soil mud to low laying area of Dockyard acomplete all as specified and as directed.

Material and labour for dismantling taking out dead/defective cable of from substation or any place of size 50 sqmm to 400 sqmm and Brought to salvage store area complete all as specified and as directed.

Dismantling taking out LT/HT cable from cable rack/floor of sub station for repair of wornout steel cable rack or for realignment of cable and refixing the cables with proper stacking with proper alingnment of cable and refixing the cables with proper on repaired/existing rack and making feeder wise bundle of cable using PVC cable tie for sizes of cable 3.0/3.5 core 95 sqmm to 185 sqmm 11000/1100 volt grade complete all as specified and directed. Note : Each cable shall be measured separately. Steel cable rack shall be measured separately as supply and fix

All as per item No 11.00 above, but for cable sizes 240 sqmm

All as per item No 11.00 above but for cable sizes 300 sqmm

All as per item No 11.00 above but for cable sizes 400 sqmm

M&L for aluminium strip 32 x 6mm with saddle and fixing screws, including insulating block for connection of pit to bldg test point complete all as specified and directed.

M&L for copper strip 32 x 6mm with saddle and fixing screws, including insulating block for connection of pit to bldg test point complete all as specified and directed.

M & L for casting Chemical earth pits with Pipe in Pipe technology 50 mm Cu bonded , 200 microns, 3 Mtr Long Earth Electrode targeted/ achieving individual earthpit result from 1.5 ohms upto maximum of 5.0 ohms for each individual pit and by maintaining of expected Grid value of 0.20 ohms but less than 0.5 ohm for grid earth pits as in around individual technical building with the following items, specifications and testing complete for each pit complete all as specified and directed. (i) Boring 300 mm dia of earth pit in soft and loose soil upto the depth of not less than 2.5 m deep below ground level by means of any method i.e boring/ digging including removal of excavated material to a distance of 50 m as directed by Engr-in-charge in each pit. (ii) Filling the each bore hole with 10 kg thick compacted layer of earth enhancing compound to reduce the soil resistivity as per Clause 14.5d of IEEE 80:2000 (latest Edition) of make Terec+ as per manufacturers specifications.

iii) Placing of 3 m length of 50mm dia of copper bonded pipe-in-pipe earth electrode with welded copper plate 38mmx200mm of 12mm thick on top. The earth rod should be placed at centre of each bore hole/earth pit with minimum of 10 kg inserted in to Terec+ layer (iv) Back filling with earth enhancing compound up to earth pit GL to reduce the soil resistivity as per clause 14.5b of IEEE 80:2000 (latest Edition) of make Earthcon upto the ground. (v) Connecting/Jointing/brace welding each electrode of earth pit serially with copper earthing strip 25X3 mm with minimum 3 m distance between two earth pits buried below GL in trench filled with earth enhancing compound to reduce the soil resistivity as per Clause 14.5b of IEEE 80:2000 (latest edition) by enhancing its ionic properties, dispersion properties, hygroscopic properties, expansion properties, diffusion properties etc, incl earth excavation complete all as directed by Eng-in-charge.

(vi) Placing 500X500X250 mm HDPE earth pit cover (IEC 62561-5) flushed with ground placed over 100mm thick PCC (1:3:6 Type I) of size 550 x 550 mm including required earth excavation, refilling and packing. The earth pit cover should be UV stabilized, lockable jam free lid, stackable design, resistant to substances including petrol oil, diesel, bitumen and concrete etc vii) The quoted rate is deemed to be inclusive of necessary removal of excavated soil to a distance of 50 mtr as directed by the Engr-in-Charge. viii) Any other requirement if desired by the Engr-in-Charge as per site conditions shall be provided by the contractor without any extra cost. Note: a) The earth pits should have a minimum distance of 3m from each other and a minimum distance of 2m from building walls b) If grid value is found less than 0.5 ohms then the contractor will re-execute earth pits or put addl pit with no extra cost to the Govt.

ALPHA ENGINEERING CONSTRUCTIONS

MSN ENGINEERING WORKS

M.V.K.ENTERPRISES

REAL ENGINEERING WORKS

R AND A ASSOCIATES ENGINEERS CONTRACTORS

VENKATESWARA ENGINEERS AND CONTRACTORS

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KIRON ENGINEERING CORPORATION