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TECHNICAL SPECIFICATION FOR

AIR CONDITIONING SYSTEM OF AUXILIARY BUILDING

OF M/s BPSCL, BSL , BOKARO

TS No. MEC/11/40/Q6HQ/TS-AC1

!"#"$%&

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TS No. MEC/11/40/Q6HQ/TS-AC1>

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TS No. MEC/11/40/Q6HQ/TS-AC1F

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TS No. MEC/11/40/Q6HQ/TS-AC1!!$5!$>/$>6!!!*&0

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TS No. MEC/11/40/Q6HQ/TS-AC1>>

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TS No. MEC/11/40/Q6HQ/TS-AC1>6

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5 ($1!%"$!,!$#

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TS No. MEC/11/40/Q6HQ/TS-AC1>F

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08.00 ELECTRICAL SYSTEM

08.01. Supply Conditions for Electrical System

Environmental Conditions

Max. Ambient Temperature for MillFloor equipment 55 deg C

Max. Ambient Temperature forPressurized Ventilated Rooms (HT/LT Rooms, MCC Rooms)

45 deg C

Humidity 100% (not occurring simultaneously with max.

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ITEM PROJECT SPECIFICATION

others / 3.0 mm for removable bottom gland

plates.

Lifting facility For each transport section. Removable type

Length of shipping section 3000 mm (max)

Protection class IP-44

Power bus bar Aluminum with Color marked. Horizontal onTop of the panel with TP + N.

Control bus bar On Top of the panel with vertical droppersfor each panel.

Earth bus bar Horizontal at the bottom of Panel Half size ofthe Power Bus bar.

Cable entry From bottom of the panel

Incomer termination Cable

Minimum mounting height ofequipment inside panel

150 mm

Panel interior shade Off white

Provision for extension On one side

Operating height Between 450 1800 mm

Cable alley Vertical cable alley of 300 mm toaccommodate Aluminum cables & theirtermination.

Identification Plates Inscription plate for each module &designation plate for each panel

Power terminals Suitable for Aluminum Cables (min 10 sq.mm size)

Control terminals Clip on type with minimum 6 mm sq size withvisible physical barriers for different VoltageGrades

Mounting of terminals DIN rail mounted

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Access of Components/ devices From the front only.

Door interlock Compartment door interlocked with mainpower isolating device (with provision ofdefeating it).

Overload reset P.B Shall be on panel front & operable fromoutside.

Neutral bus Run on insulators with facility for connectionto earth bus bar at 2 points

Marshalling Panel The PLC input/output terminals of individual

module shall be internally wired and broughtup to the marshalling terminals

Spare feeders 20% (minimum one of each type) Fully wiredup.

Spare terminals 20% for control terminals

ELECTRICAL PARAMETERS

Power supply 415 V, 3 Ph+ N, 50 Hz, AC

Rated Insulation Voltage 1100 V

Short Circuit Rating 50 KA at the Power bus bars for 1 sec.

1 min. power frequency withstandvoltage

2.5 kV for Power circuit & 500 V for Controlcircuit

Components Type 2 co-ordination

Power contactor Min. size 16 A.

Auxiliary contactor 2 NO + 2 NC for ACB / MCCB / PowerContactor / O/L relay

Control Wiring By 1.5 mm sq stranded copper wires

Control voltage Achieved through single control transformer

with 2.5% & 5% tapping

Indications ON/OFF/TRIP for Incomer & outgoingFeeders on panel front.

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Control supply ON

Metering Ammeters, KWH & Voltmeters withfuses and selector switch for incomer.

CT operator ammeters for allcontinuously running drives above 11KW

Ammeters & Selector Switch for eachphase for drives of 30 kW & above.

Meter Sizes Incomer -144 X 144

Outgoing 72 X 72

Power socket outlet Required

No of outgoing feeders As per requirement of this package

Interlocks Shall be provided feeder wise as per systemrequirements.

Accessories Lifting eyes, anchor bolts, channel base,nameplates.

Incomer Air Circuit Breaker (draw out type) > 800 A /MCCB

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Service Indoor

Type Air-Break, Draw-out type

Insulation level Impulse withstand(1.2 x 50 micro Sec)

6 kV

Operating mechanism Stored energy type

Closing Motor wound spring operated

Opening Shunt trip coil

Latching arrangement Mechanically and electrically trip free

Minimum no. of operations As per IS-13947 (1993)

No. of poles of C.B 3

Limits of temperature rise As per IS-13947 (1993)

Molded Case Circuit Breaker

Type Air Break (Motor duty)

Rated service voltage 415 V

Short Circuit Rating 50 KA for 1 sec.

Insulation level Impulse withstand(1.2x50 micro Sec)

4 kV

Releases Incomer duty Adjustable Thermo-magnetic

Motor Duty Magnetic only

Service Indoor within steel cubicle for maximumsystem voltage, starting of motors andmiscellaneous loads

No. poles 3

Utilization category A

Aux. Contact requirement Min. 2 NO & 2 NC contacts

Standard followed IS-13947 (1993)

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Contactors

No. poles 3

Rated service voltage 415 V + 10%

Rated frequency 50 Hz + 5%

Control circuit 240V, 1-ph, 50 Hz

Utilization category AC-23A for Uni-directional motors, AC-24Afor Bi-directional motors

Auxiliary Contact requirement Min. 2 NO & 2 NC contacts

Limits of operation

Closing (pick-up) 85% to 110%

Dropout Shall not be higher than 75%

Thermal Overload Relays

Type Ambient temperature compensated bimetaloperated hand reset type (Direct or CToperated above 11 KW)

Hand resetting feature To be provided at the front of the panel

Single phasing protection Built in

Control Transformer

Service Indoor

System 415V, 3 phase, 4 wires, 50 Hz. Solidlyearthed neutral

Type Dry, cast resin, class B or better

Voltage ratio 415V/240VRating As per requirement

Power frequency withstand voltage 2.5 kV for 1 minute

Quantity 2 nos. per board

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Current Transformers

Service Indoor

System 415V, 3 phase, 4 wires, 50 Hz, Solidlyearthed neutral

Type Resin cast, window type

Rated voltage, VA burden 415 V +10%, 15 VA

C.T. secondary rating 5 Amp

Accuracy (Protection application) 5P10 or better

Accuracy (Metering application) Class 1

Power frequency withstand voltage 2.5 KV (RMS) for one minute

Mounting Inside switchgear cubicle in stationary portion

Potential Transformer

Type Single phase (2 nos. per bus section)

Mounting Mounted in panel with voltmeter and selectorswitch

Ratio, Burden 415/110 V, 50 VA

Over voltage factor 1.1 continuous and 1.5 for 30 sec

Push Buttons and Indication Lamps

Push button Shrouded for START buttons- GREEN

Un-shrouded for STOP buttons- RED

Lockable for EMERGENCY STOP- RED

Push button aux contacts 2- NO + 2- NC of 10 Amps rating

Push button size 22.5 mm Dia

Indicating lamps Cluster LED type

Indicating lamp size 19.0 mm Dia

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08.02.02 Start Up Panel / Local Control BoxesITEM PROJECT SPECIFICATION

CONSTRUCTIONAL FEATURES

Construction Sheet steel construction with minimumthickness of 2.0 mm

Mounting Wall/ Structure mounted, Dust and VerminProof

Door Hinged, dead front type

Base Plate Removable & at the bottom for cable entry

Mounting Fixture To be provided for Wall/ Structure mounting

Enclosure IP-55.

Labeling Devices / lamps / meters / displays etc shallbe mounted on the front and identified withindividual labeling

ELECTRICAL FEATURES

Control Wiring By 1.5 mm sq Stranded Copper Wires

Power Terminals Minimum 10 mm sq size

Control Terminals Clip on type with minimum 6 mm sq size withvisible physical barriers for different VoltageGrades

Mounting of terminals DIN rail mounted

Push button Shrouded for START buttons- GREEN

Un-shrouded for STOP buttons- RED

Lockable for EMERGENCY STOP- RED

Push button aux contacts 2- NO + 2- NC of 10 Amps rating

Push button size 22.5 mm Dia

Selector switch 2 position and 2 independent poles

Indicating lamps Cluster LED type

Indicating lamp size 19.0 mm Dia

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Spare terminals 20% for control terminals

Cable entry From bottom

Control voltage 240 V AC

PLC I/O voltage 24 V DC

Meters Minimum size of all meters will be (96x96) mm.

Pre-wiring Factory assembled and complete with thewiring up to individual control devices,meters, displays and lamps,

Power Socket Shall be provided for maintenance purpose

(1- Phase)

Inspection Tests As per the attached QAP

08.02.03 Low Voltage Squirrel Cage Induction Motors


CONSTRUCTIONAL FEATURES

Type Squirrel Cage AC Induction Motor

Frame Sizes As per IS-325 / IEC-34

Motor Body Gray Iron Casting as per IS-210-1978

Motor Feet Integrally Cast with the Stator

Degree of Protection IP-55

Cooling IC- 0411

Mounting IM-1001

Ambient Temperature 50 Deg C

Shaft extension Single, Cylindrical

Bearing suitable for Bi-Directional motion

Canopy protection For all outdoor motors

Lubrication Grease for motor bearing through nipple onboth DE & NDE

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Coupling Finish Boring, key seat cut and fitting of motorhalf coupling is included in the scope of motormanufacturer

Accessories Motor base plate/foundation plate, anchoringmechanism, foundation bolts, Motor fixingbolts, nuts and washers

Earthing terminals Two. On the opposite sides of motor body

Terminal Box

Terminal Box On top of the motor suitable for termination of

Aluminum cables of sizes as given in theannexed table

Degree of rotation of terminal box Rotatable by 4 x 90 deg

Earthing Stud Inside Terminal Box

Extension of TB Shall be possible for accepting Aluminumcable, wherever required

Cable Glands Double Compression Type

QUALITY OF OPERATION

Balancing Dynamically balanced with full key on theshaft end & fan

Vibration Intensity As per IS-12075- 1986

Noise Level As per IS-12065- 1987

ELECTRICAL DESIGN

Input Power 415 V, 3-ph, 50 Hz, AC

Power Supply Fed from DOL Starter housed in MCC

Class of Insulation Class-F with Temp rise limited to Class B

Min. Voltage for Start & Run up 80 % of Rated Voltage

Starting Torque > 160 % of rated torque

Starting Current < 600 % of rated current

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embossing on the outer sheath :

Manufacturers name & trade mark, Voltagegrade, Year of manufacture,R,Y,B color identification for phases andBlack for neutral (fourth core)

08.02.04.02 1.1 KV Grade Control Cable


Voltage Grade 1.1 kV grade

Duty type Heavy duty

Cross sectional area 1.5 sq.mm.

Conductor type Stranded copper conductor

Insulation type PVC insulated, PVC sheathedSpare Cores 3, 5 and 7 cores cables shall have at least

one spare core, cables with 10 core andabove shall have at least 2 spare cores.

Reference standard IS:8130-1984, IS:5831 1984, IS:3975 88,IS:1554, part-1, 1988 with latest amendments

Core identification Cable identification shall be provided by

embossing on the outer sheath:Manufacturers name & trade mark, Cores ofthe cables up to 5 cores shall be identified bycolor of insulation.For cables having more than 5 cores,identification shall be done by numberinginsulation of core sequentially.

08.03 Erection and Earthing materials

All cables accessories, erection and earthing materials, exposed conduits, clamps,brackets, supports, cable trays, cable clamps, cable tags, ferrules, termination

accessories, cable joints lugs, conduit sealing compounds and any other material asrequired to complete the installation shall be in the scope of tenderer. Tenderer shallprepare layout drawings with section details of all cable trays/cable route No. details,earthing layout with running level, SLDs details with mounting level, mountingarrangement drawings with cable route nos.. etc. with its BOQ for necessaryconcurrence by purchaser/consultant.

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Conductor size for ground connection

For equipment ground connections, the minimum conuctor sizes used should be asfollows :LT system where the Voltage does not exceed 650V normally :

6 Sq. mm stranded GI wire for :

Motors & starters upto and including 2.2KW, Light fittings, JBs, etc.

Instruments and miscellaneous small items protected by fuses of ratings notexceeding 15A.

16 Sq. mm stranded wire for :

Motors & starters above 3.7KW, and upto and including 15KW

25X3 mm GI flat for :

Motors & starters above 15KW, and upto and including 45KW, Light fittings

Control desks, cabinets, LCBs, Welding socket outlet, Isolators, LDBs.

50X6 mm GI flat for :

Motors & starters over 45KW

MCC, PDB, MLDB

Main earthing ring from MCC room & that running in the Building

Cable trays all round

LT switchboards and other equipment protected by circuit breakers.

Earthing electrodes

The earthing electrodes shall be of GI pipes 50 mm dia and about 4mm thickness inone piece provided with water holes and other filling devices. Earthing system forcomputer/microprocessor based equipment shall be distinct and separate from thepower and lighting equipment earthing system.

08.04 Preferred Make List

MCC, PDB, SUP, Control Post Siemens / ABB / L&T / Schneider

LTAC Motors Siemens, KEC, Alstom, CGL, ABB.

Power and Control Cables Asian Cables, CCI, Polycab, Universal Cables,Uniflex, RPG Cables

ACB / MCCB/ MPCB Siemens / ABB / L&T / Merlin

Power Contactor, Auxiliarycontactor, O/L relay

Siemens / ABB/ L&T / Merlin

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MCB Havells / Standard / S&S Power

Push buttons Siemens / L&T/ GE Power / BCH

Selector switch, Control switches Siemens / L&T / GE Power / Kaycee

LED indication lamp Binay / Siemens / L&T / BCH

CT, PT AE / Kappa

Ammeter, Voltmeter AE / IMP / MECO / Alsthom

Terminal Blocks WAGO/ Elmex / Connect well / Essen

08.05 SUPPLY OF EQUIPMENT

Sl.No.

Description Unit Qty UnitRate

Total rate

1 Control Panels for Air ConditioningSystem

Lot 1

2 MCC for Air Conditioning Systemincluding feeders for AHU MCCs

Lot 1

3 PDB for Air Conditioning System Lot 1

4 MCC for floor wise AHUs Lot 1

5 Wall mounted, start-up Local /Remote Operator Panels (SUP)complete with switchgear controls,operators devices, and indication /annunciations.

Lot 1

6 Junction boxes (Quote unit rate forvarious types/sizes)

Lot 1

7 Any other item as required to makethe installation complete.

Lot 1

8 Power and control cables. Lot 1

9 Erection and earthing materials Lot 1

10 Erection of all electrics for the scopecovered in this specification.

Lot 1

Man day rate for supervision oferection, testing and commissioning.

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