NATIONAL ALUMINIUM COMPANY LIMITED - Rites

A separate room shall be provided adjacent to WT control room to house the Dust suppression
MCC, Pumps, compressors etc for the DS System by the Bidder. Bidder shall furnish the
complete requirements quirements including size, cable trenches/opening, etc. The pressurized ventilation
shall be provided by the Bidder in this Dust Suppression Room.
The number of MCCs / DBs shall be provided as per requirement by the bidder.
Following shall also be inclu included in the Bidder’s scope:
• Pressurized ventilation system for the switchgearroom
switchgearroom.
• Pressurized ventilation system for the Dust Suppression cum MCC room.
• Air conditioning of battery and battery charger rooms.
• Exhaust fan in the transformer rooms.
The bidder r shall supply the PLC for safe operation of WT System. Necessary integration with
existing PLC of new coal yard will be scope of tender tenderer. . Design and installation of electrics shall
ensure operation of complete integrated electrics of the various drives/m drives/mechanism without
any constraint during maintenance.
Bidder shall also consider sufficient numbers of local auxiliary PDBs to cater miscellaneous
loads of WT System. These PDBs shall be located at various places and exact locations shall be
finalized during g detailed engineering.
HT Power cables and LT power/control cables shall be laid in different cable trays. LT power
cables and LT control cables shall also be laid in different trays. 24V DC cables shall be laid
entirely in different dedicated trays.
Cable trays in single tier or in multitier shall be installed in vertical arrangement everywhere to
avert coal accumulation and space reduction. Cable trays shall be supplied by the bidder.
Power supply of all voltage levels including 415V AC or 220V DC, 24V DC etc, shall be arranged
by Bidder himself by providing suitable systems. 24V DC supply shall be through screened
cable to be supplied by the Bidder.
Only at receiving point of 33KV, control supply of 415V AC and 220V DC shall be made
available by the he purchaser purchaser.
Following HT cabling shall also be included by the Bidder apart from the above:
1. ACSR conductor for O/H transmission of 33kv line.
2. Cabling required for underground track/road crossings of33 kV System including intake
pump well feeder and ashpond feeder feeder.
Standard power and control cables (Trailing Cables) of required sizes in adequate quantum
shall be supplied and terminated by the Bidder. Hence, complete HT & LT trailing cables for
Wagon Tippler, etc tc shall be supplied and laid by the bidder.
Cables used for 24 VDC supply for PLC system shall be laid separately from 230 V AC control
cables.
Technical Specification:Sec-6, Electrical
Page 6 of 97