Enhancing the existing power cable and MV panel in NBCC Building at IITM Discovery Campus Thaiyur

Amount

CABLES AND TERMINATIONS

Supplying & Laying of following sizes 1.1KV LT UG Aluminium armoured XLPE Power cable in trench of 50cm wide and 75cm depth including earth work excavation in all soils and sub soils spreading 6cm thick river/M- sand and lay the cable inside a 100mm DWC pipe and back filling, consolidated in a regular interval of 25cm thick rammed and complying with standard specification.

3.5C X 300 sq.mm

Supplying & Laying of following sizes 1.1KV LT UG Aluminium armoured XLPE Power cable in the existing masonary covered cable trench / Hume/RCC/Metal pipe as required.

3.5C X 300 sq.mm

3.5C X 240 sq.mm.

Supplying and making end termination for following sizes alu. Conductor LT UG cable using suitable compression gland with required copper ferulles / socket and other jointing materials.

3.5c X 400 sq.mm

3.5c x 240 sq mm

MV PANEL

Supply , Erection,Testing and commissioning of suitable size extendable floor mounting cubical type following LT Main Panel board suitable for 415V 3ph 4 wire 50Hz AC supply system fabricated in a compartmentalized design from CRCA sheet steel of 2mm thick for frame works and cover with 3mm thick removable gland plate ,cleaning and finishing with 7 tank process for powder coating with siemens grey having extensible type TPN Aluminium busbar of suitable capacity as per the incomer ACB /MCCB/SDF ratings with DMC/SMC busbar suppotrs with short circuit withstand capacity of 31MVA / 1Second , bottom base channel of 100mmX 50mm X 5mm. .The In/Out going Cable entry should be from the rear side of the panel.

BUS BARS

Bus bars will be Aluminium , air insulated , R,Y,B, N(Black) PVC sleeved capable of carrying full load current for all the 3 phases and neutral continiously. The current density of copper shall be designed for 0.8A per sqmm. The bus chamber should have proper air ventilators.

EARTHING

2 separate run of 25 x 3 mm copper earth bus painted in green colour should be provided all along the panel and connected to the main grid. Interconnectios should be taken to metering chamber, MCCB's, ACB's, FSU's etc sothat all current carrying components are effectively earthed.

ADDITIONAL SCOPE OF WORK

The scope of work includes minor civil works like breaking of concrete floors ,construction of masonary trench if required for the proposed panel as per the instruction from the Engineer in Charge.Necessary Panel drawings , QAP and GTP have to be approved by the Engineer incharge before fabrication.

Indoor PANEL

Incomer

630A TPN MCCB 36kA with micro processor based trip units ,front operated handle and with ON/OFF/TRIP indications-1 No

Outgoing

400A TPN MCCB 36kA with micro processor based trip units ,front operated handle and with ON/OFF/TRIP indications-2set

250A TPN MCCB 36kA with micro processor based trip units ,front operated handle and with ON/OFF/TRIP indications-4set

630A Aluminium bus bars for 3phases and same size for neutral

3 phase indication lamps with toggle switch-1set, microprocessor based digital multi function meter with communication port and the facility for active and reactive power measurements -1set with required CTs and control fuses etc.Necessary Spreaders / extended copper bus bars of suitable rating with required holes should be provided for the cable and bus bar terminations.All the front operated handles should have pad lockable type in both ON/OFF positions. All the incoming and out going cable entries are from top of the MV Panel.

EARTHING

Supply, Erection, Testing and Commissioning of Cast iron pipe and copper plate earth as per IS - 3043 - 1987 including excavation of soil and sub soil , back filling with equal layers of salt and charcoal and the excavated soil , ramming, consolidating, Masonry construction, heavy duty cover slab etc. The CI pipe should be 100mm dia and 3mt long bolted with 600 x 600 x 3 mm thick copper plate at the bottom. 2R of 50 x 3 mm copper flats should be taken from the copper plate to the top of the CI pipe and clamping with suitable clamps.

Earthing the installation with the following sizes of earth wires. The rate shall be inclusive of spacer clamp for main earth flat suitable clamping with the MS flats for earth wires including crimping of socket etc.or laying below 0.5m from ground level including earth work excavation and refilling the excavated soil.

50 x 5 mm GI Flat

25 x 5mm GI flat

POWERPOINT (BID ID -848198)

vk sam engineering (BID ID -847707)

AADHI ELECTRICAL AND CONSTRUCTION (BID ID -847162)

POWER TECH ENTEPRISES (BID ID -848376)

Madras Power Corporation (BID ID -848608)