Technical data

CHAP-04.10 ELECTRICAL POWER DISTRIBUTION, DRIVES, CONTROL &
ILLUMINATION ELECTRICAL
Page 18 of 50
- Illumination levels of all units will be as indicated elsewhere in this
specification.
- The maintenance factor for design of illumination level will be
considered as 0.6 for all areas.
- For arriving at utilization factor, manufacturer's recommendation will
be followed.
- All rooms with false ceilings will be provided with recessed type
decorative mirror optics fittings.
- All MCC Rooms will have lighting switches near doors.
- All decorative type fittings will be mirror optics type.
- All buildings will be provided with peripheral lighting.
- The power factor of lighting system will be improved to 0.9 by
providing in built capacitors with individual light fittings.
- Area, outdoor and peripheral lighting will be fed from separate
LDB/SLDBs having two modes of control - AUTO and Manual. Under
AUTO mode lights will be automatically switched ON/OFF through
24Hrs Timer & Contactor where as in Manual mode, lights will be
switched ON/OFF through local control station located in
Despatcher/Control room. Selector switch for mode of control will be
located on local control station.
- Lighting in conveyor gallery and junction houses (floors above
ground) will be connected to separate lighting circuit and the same
will be switched ON/OFF by PLC based control from HMI at
Despatcher.
- Area lighting, wherever applicable, will be provided through 400W,
HPSV flood light fittings mounted on lighting towers.
- Road lighting will be provided with 250W HPSV street light fittings.
- All the offices will be provided with ceiling fans.
- For indoor lighting, outgoing feeders in MCB DBs will be 20A SPN
MCBs. Each feeder will not be loaded more than 2 kW. Incomer to
MCB DB will be suitably rated heavy-duty switch and ELCB for
detection of leakage current.
- For area and road lighting, 3 phase & neutral feeders may be used
and accordingly suitably rated 4 core cables may be provided.