NATIONAL ALUMINIUM COMPANY LIMITED - Rites

All cables Power cable, Control Cable, Trailing Cable, instrumentation cables, signal cables,
screened cables, es, special cables, fibre optic cables shall be supplied, laid and terminated by the
Bidder as per actual site requirement.
Cabling shall include laying and termination at both ends, cable trays and cable accessories for
the cables to be laid by the Bidd Bidder.
Bidder shall consider all required cables for cable engineering, preparation of cable schedule,
terminal plans, cable support structure layout, cable layout drawings, etc. All cable trays,
accessories, termination kits, glands, lugs, clamps including clamps, etc shall be included in the
scope for all the cables (to be supplied by the Successful Bidder) interconnecting both side
equipment or one side equipment of the Bidder’s scope.
All drives shall be controlled and monitored at existing WT SYSTEM control room from the PLC.
Bidder shall include PLC and all the interfacing/ interconnecting cabling and cable trays. All
Cables required for this interfacing, shall be supplied and laid by the Bidder. Copper power
cables, if required by the bidder, shall also be under scope of supply and laying of the bidder.
Ampere meters for all conveyor belts are to be installed at the control room for monitoring
the current of each drive.
Bidder shall consider numeric PLC and type of Inputs / Outputs (I/Os) required for WT system
for smooth and trouble free operation of various drives / mechanism from the WT SYSTEM
control room. Sufficient number of I/Os in PLC extension shall be considered as per act actual
requirement. Exact number and type of I/Os shall be decided during detailed engineering
based on approved schemes.
Bidder shall also consider sufficient number of I/Os in PLC control and monitoring for electrical
power distribution system for the electrical power distribution system starting from 33KV till
the down most voltage level.
New PLC of WT shall be interfaced with existing PLC of Coal Handling Plant for operation of BC
– 115 and BC – 103.
The earthing system shall be provided for compl complete ete WT SYSTEM plant. The new earthing
system shall be connected to the existing earthing system.
Bidder shall also consider earthing of following equipment:
Technical Specification:Sec-6, Electrical
• 33kv substation equipments.
• WT LT distribution transformers – Neutral as well as body earthing
• 415 5 WT SYSTEM PCC at WT SYSTEM substation in switchgear cum MCC room
• Control panel for power distribution equipment at existing WT control room
• LT busducts
• Charger panels, DCDB, etc at WT substation in switchgear cum MCC room
• Underground eart mat.
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