Technical data

CHAP-04.10 ELECTRICAL POWER DISTRIBUTION, DRIVES, CONTROL &
ILLUMINATION ELECTRICAL
Page 17 of 50
- All equipment will strictly conform to the General Specification,
except where any deviations have been explicitly spelt out,
specifically discussed and mutually agreed upon between the
Contractor and the EMPLOYER.
- The detailed specification and schedule of quantities will be worked
out based on the detailed engineering to be carried out by the
Contractor, for complete and proper execution of the specified tasks.
- The final ratings of the circuit breakers, CTs, busbars will be
adequate for the actual loads and considering the derating factors as
substantiated by temperature rise test on the 415 V switchboards. All
CT ratios / VA burdens, ranges of meters and instruments, types of
relays and relay setting ranges will be submitted for EMPLOYER’s
approval during detail engineering.
- All HT cables will be 11 kV (UE) grade of size 3x185 sq mm (min).
04.10.07. Design basis for electrical premises for the proposed units
GTS is to be referred for designing of electrical premises & layouts,
selection of equipment and installation. In addition to this, following
points will be considered.
- Motor Control Centre (MCC), RIO stations, PDB, MLDB etc. to be
installed in various MCC rooms, will be provided near various
shop/technological units.
- Wherever required, MCC rooms and LT substation rooms (including
rooms for distribution transformers) can be combined with separation
wall and independent entry for both LTSS and MCC rooms
considering the location of Substation and shop unit. Each LTSS
building will have store facility.
- No under ground cable basement to be provided below MCC
buildings.
- PLC, CPU panels, Operator panel / HMIs, Engg stations, UPS, UPS
battery will be located in the air-conditioned room in the control room
floor.
- For high rise buildings structural walkway will be provided for
maintenance of light fittings.
04.10.08. Design Basis for Illumination System
GTS is to be referred for designing of Illumination System, selection of
equipment and installation. In addition to this, following points will be
considered.