WIXLIB

TECHNICAL SPECIFICATIONS OF NIT FORADDITAIONAL COOLING TOWER CELLSTECHNICAL SPECIFICATION FOR ELECTRICALWORKCLIENT : NFL VIJAIPURNFVP/CTC-TS –E-10Annexure-E1REVSHEET 5 OF 44switch, LMS, CCR, lighting fixtures etc.) & supply the cable accordingly. Bidder shall prepare a cableschedule& submit for approval. Plot plan Indicating location of site as attached as reference.2.2.10 All t h e civil works like making foundations for new PMCC/ extension of panels, Road crossingfor cable laying, Mounting structures for cable laying,and m a k i n g cable trenches etc.pertaining to electrical equipment are i n cluded in the scope of work of the contractor2.2.11 The electrical system and installation shall be designed as per latest standards and best engineeringpractice to provide maximum reliability, flexibility, safety to personnel as well as equipment and easeof operation and maintenance.2.2.12 TESTS & INSPECTIONI.All equipment shall be tested in accordance to relevant standards in presence ofowner’s representative at manufacturer's works before despatch and at site. Allsuch tests shall be arranged by the Bidder at his cost. Tests that shall beconducted shall be inclusive of following:a. Routine Testsb. Acceptance testsc.Type tests, (if results of type tests done on similar equipment at any dulyaccredited laboratory within last three years are not submitted or test resultsare found unsatisfactory)ii. The owner may reject any portion of the work considered defective or of poorworkmanship and the Bidder shall make good these defects without extra cost toowner.iii. Electrical installation work shall be subjected to inspection by owner/ his authorisedrepresentative, statutory bodies like Electrical Inspector, Factory Inspector andwhere applicable by equipment supplier’s engineer. The Bidder shall carry outwithout any extra cost to owner; rectifications/ modifications desired by the aboveauthorities to make the installation conforming to applicable international rules etc.2.2.13 CO-ORDINATION WITH OTHERSi. The Bidder shall co-ordinate with owner/ other contractors/ agencies as required forproper, smooth and timely execution of work/ implementation of the project.2.2.14 SPARESi. The spares to be included by bidder in his offer shall compriseii. Commissioning spares1. List of commissioning spares shall be mentioned in offer and price shall beincluded in lump sum price for the package.iii. Insurance spares1. List of insurance spares shall be mentioned in offer and unit price (in pricepart) & delivery period shall be indicated.iv. Spares required for two years normal operation and maintenance of the shall besupplied as per ITB and price shall be included in lump sum price for the package.2.2.15 TOOLS AND TACKLESi. The Bidder shall supply at least one set of all special tools required for maintenanceof the equipment supplied by them and price shall be included in the offer.

TECHNICAL SPECIFICATIONS OF NIT FORADDITAIONAL COOLING TOWER CELLSTECHNICAL SPECIFICATION FOR ELECTRICALWORKCLIENT : NFL VIJAIPURNFVP/CTC-TS –E-10Annexure-E1REVSHEET 6 OF 443.0CODES & STANDARDS3.1The design, manufacturing, testing at manufacturer’s works, erection, testing after installation andcommissioning of the equipment shall comply with the latest issue of relevant Standard Specificationand codes of practices published by Bureau of Indian Standards, OISDs and IEC read withamendments up to date. In case of imported equipment, relevant IEC and/ or other internationalstandards shall be complied with.3.2The equipment and installation shall also comply with the provisions of latest issue of IndianElectricity Rules and other Statutory Acts and Regulations.3.3Should there be any conflict and/ or contradictions in requirements stipulated in various standardsand/ or this specification, the most stringent shall be followed. The bidder shall also bring suchconflict to the notice of owner/ consultant in writing.4.0ENVIRONMENT/ SERVICE CONDITIONSThe equipment shall be designed for the following site conditions:04.1Max. /Min. / Design Ref Temp.: 50/1.5/50 C4.2Relative humidity: 100%4.3Altitude above sea level: Less than 1000 M4.4Atmospheric pollution: Ammonia Vapours & Urea Dust5.0SYSTEM DETAILSElectrical systems details shall be as follows:5.1Nominal Voltage5.2Highest System Voltage :457V5.3Number of phases:3 Phases Neutral5.4Frequency:50Hz 5%5.5Combined Voltage & Frequency variation5.6Maximum Fault Level:35 MVA5.7Control Supply:240V 10%, 50Hz 5%, 1Ph, 2Wire:415V 10%: 10%(Obtained through 415/ 240 volt control transformers)5.8Neutral Earthing:Solidly grounded

TECHNICAL SPECIFICATIONS OF NIT FORADDITAIONAL COOLING TOWER CELLSTECHNICAL SPECIFICATION FOR ELECTRICALWORKCLIENT : NFL VIJAIPURNFVP/CTC-TS –E-10Annexure-E1REVSHEET 7 OF 446.0GENERAL DESIGN AND CONSTRUCTIONAL REQUIREMENTS6.1The electrical system and installation shall be designed as per latest standards and best engineeringpractice to provide maximum reliability, flexibility, safety to personnel as well as equipment andease of operation and maintenance.6.2All equipment shall have adequate and standard ratings.6.3All equipment shall be suitable for use as per classification of the area in which those are installed.6.4All live parts shall be adequately protected to prevent inadvertent or accidental contact.6.5All external hardware shall be of stainless steel6.6All equipment shall be provided with stainless steel nameplates containing the particulars along withthe description and Code Nos. of equipment.6.7All detailed drawings, equipment sizing make & type of equipment shall be subject toowner / consultant.6.8Indication lamp wherever mentioned in this document shall be LED (LVGP) Type suitable for controlsupply.6.9The equipments to be located in hazardous areas shall be suitable for hazard involved and shallhave the following additional explosion protection:Equipment.1.2.3.4.5.6.7.8.9.10approval ofZone-1Zone-2ExdExeStarter panelsExdExdControl panelsExd/ExpExdLocal Control StationsExdExdLighting fixtures, hand lampsExdExe/Exd/ExnRSwitch socketsExdExdSwitches/IsolatorsExdExdJunction BoxesExdExdOtherequipmentsproducingsparks under normal operationExd/ExpExdOther non-sparking equipmentsExd/ExpExn/ExeMotors

TECHNICAL SPECIFICATIONS OF NIT FORADDITAIONAL COOLING TOWER CELLSTECHNICAL SPECIFICATION FOR ELECTRICALWORKCLIENT : NFL VIJAIPURNFVP/CTC-TS –E-10Annexure-E1REVSHEET 8 OF 447.0EQUIPMENT SPECIFICATION:7.1Switch Boards/ New PMCC/ Extension of existing PMCC (Siemens Make).1General(a) Switch boards with a scheme offeeders & spare feeders(b)(c)02 Incomers & 01 Bus coupler having motorThe PMCC bus bar shall be horizontal type & dropper shall be vertical type only.The control supply shall be through individual bus control transformers. Rating415V/240V AC(d) Breaker trolley shall be three positions: - Service, Test and Isolate. In serviceposition, the power as well as control connections shall be made. In test positionpower connections shall be disconnected but control connections shall be made. Inisolate mode, the power as well as control connections shall be disconnected.(e)Suitable shutter arrangement shall be provided to protect the personal fromaccidental contact with live bus in trolley chamber.(f)Degree of protection provided by enclosure of switchboard shall be as follows:(i) For switchboards rated up to 1600A: IP-52(ii) For switchboards rated above 1600A: Incomers and bus-coupler Panels: IP-42 Remaining panels: IP-52(g)The new PMCC/PMCC Extensions of existing PMCC (Siemens Make) on both sidesshall beinstalled in the existing available space in cooling tower substation. Ifextensions of PMCC is possible then New PMCC is not required and only 08 nos. ofprewired starter modules shall be extended (as per motor rating and switch fuse forreceptacles) on both sides (Front & Back side of PMCC on Bus A & Bus B side).(h)Bus bars shall be made of high conductivity copper/ aluminum alloy and shall beprovided with heat shrinkable sleeves.(i)Bus bars shall be of uniform cross section and supported on non-hygroscopic FRPinsulators with adequate clearances and creepage distance to prevent flash overdue to effect of dust/ moisture.(j)Sufficient bus supports shall be given to give adequate mechanical strength duringshort circuits.(k)A continuous ground bus (Copper/ GI) shall be provided at the bottom in theswitchgear for grounding.(l)Protective relays shall be mounted on the front of the switchgear panel. Draw outtype relays shall be used.(m)Protective relays for incoming feeders, bus ties, outgoing feeders and motor feedersshall be microprocessor based numerical type with communication facility.(n)All meters shall be digital multifunctional meters with communication port for energymanagement at remote location. Additionally digital type ammeter, voltmeter shall beprovided separately for various feeders.

TECHNICAL SPECIFICATIONS OF NIT FORADDITAIONAL COOLING TOWER CELLSTECHNICAL SPECIFICATION FOR ELECTRICALWORKCLIENT : NFL VIJAIPUR(o)7.2NFVP/CTC-TS –E-10Annexure-E1REVSHEET 9 OF 44The minimum thickness of sheet steel used in HV and LV fabrication of switchgearincluding charger, UPS, ASPB etc. shall be as under: Base Channel3.0 mm Load Bearing Members2.0 mm Doors and covers1.6 mm(p)The switchboards shall have adequate short-circuit ratings and be suitably sized forthe load and spare capacity foreseen. The short time rating of bus-bar shall be 1second.(q)For other boards sufficient number of spare feeders to the extent of minimum 20%for each type & rating shall be provided. Minimum one for each type and rating isnecessary.(r)All switch boards shall generally have two sections operating independently with twoincoming feeders and bus coupler all rated for 100% load of the board (includingspare feeder) having facility for changeover in the event of failure of either of theincoming circuit breakers.(s)Auto changeover shall be provided on switchboards catering to emergency loads.(t)Paralleling of two incoming feeders is not foreseen. However, facility for momentaryparalleling shall be provided for intentional changeover without interruption of supply.(u)Every enclosure door that provides access to live parts operating at 240 V AC andabove shall be mechanically interlocked with a circuit interrupting device on thesupply side such that when the door is open, the equipment is de-energized.(v)For motors with auto-starting provision, trip of a running motor will start standbymotor automatically.(w)For all other specifications, refer NFVP-CTC-2013-TS-0805, NFVP-CTC-2013-TS0806, NFVP-CTC-2013-TS-0808 and NFVP-CTC-2013-TS-0809 attached.Low Voltage Switchgears(a)Low voltage switchboards shall include the following:(i)Power Control Centers (PCCs)(ii)Power-cum-Motor Control Centers (PMCCs)(iii)Motor Control Centers (MCCs)(iv)Main Lighting Distribution Boards (MLDBs)(v)Auxiliary Services Power Boards (ASPBs)(vi)Normal / Emergency Power Distribution Boards(b)The switchboards shall be suitable for extension at both the ends.(c)All feeders of PCC and incoming and bus coupler feeders of PMCC shall beprovided with draw out type air circuit breakers.(d)Switchboards shall be provided with thermostatically controlled anti-condensationheaters.(e)All units in the MCC shall be completely accessible and removable from front. Bothpower and control connections shall be plug-in/ stab-in type.

TECHNICAL SPECIFICATIONS OF NIT FORADDITAIONAL COOLING TOWER CELLSTECHNICAL SPECIFICATION FOR ELECTRICALWORKCLIENT : NFL VIJAIPUR7.3NFVP/CTC-TS –E-10Annexure-E1REVSHEET 10 OF 44(f)Bus-bar clearances shall conform to relevant Indian Standard/ IEC for equipmentvoltages up to and including 500 V AC.(g)The draw out modules shall be standardized and it shall be possible to interchangeany module with a module of same size. The components to control the equipmentlike switch, starter, fuse, auxiliary relay etc. shall be wired as a unit on the individualmodule. Safety shutter shall be provided to prevent direct access to live parts whenthe chassis is removed.(h)The entire draw out construction should be designed for safe operation duringplacement or removal of chassis. An earthing arrangement shall be provided whichwill make contact first before the power contacts are made and break last. Eachmodule shall control one motor in general.(i)The door shall be interlocked so that it cannot be opened unless the isolating switchon that module is OFF. However, it shall be provided with a door defect mechanismfor intentional opening when on line for testing and inspection purpose.(j)Control switches for breaker control shall be provided in each breaker cubicle.Circuit breaker shall be interlocked to prevent withdrawal of a closed breaker orinsertion of a closed breaker. Each breaker shall be provided with anti pumpingdevice.(k)Provisions shall be made to manually close/trip circuit breakers on loss of controlvoltage.(l)The Motor feeder starter Module shall have Earth fault relay (CTIGM) along withcore balance CT and other protections i.e. Fuses, BM o/l relays etc.(m)The New PMCC shall have spare Outgoing feeders with at least 02 no. of eachmotor rating for ammonia CT fan motor & 02 no. of each motor rating for Urea CTfan motor.(n)All ACB feeders shall be provided with ON, OFF, Trip, Trip Circuit Healthyindications.Motorsa)Motor shall conform to ‘Technical Specification of Induction Motor’ NFVP-CTC-2013TS-0810 enclosed and Specification Sheet.b)The motor shall be energy efficient type having efficiency class of ‘Eff 1’ as per IS:12615 (2004) and high power factor type.c)The CT fan / motor shall be equipped with vibration switches for alarm / trip in caseof fan / motor vibrations exceeding preset limits. The vibration switch shall besupplied Paharpur make only as per existing vibration switches.d)The starting current i.e. breakaway current of 415 V Motors shall not exceed thevalues indicated in IS: 12615. Also there shall be no further positive tolerance on thevalues of breakaway current.e)Type test certificate of similar motor for use in specified Hazardous area (ifapplicable) shall be furnished.f)Filled in Specification Sheet and Technical Particulars for each type and rating ofmotors shall be furnished.

TECHNICAL SPECIFICATIONS OF NIT FORADDITAIONAL COOLING TOWER CELLSTECHNICAL SPECIFICATION FOR ELECTRICALWORKCLIENT : NFL VIJAIPURg)0Annexure-E1REVSHEET 11 OF 44The rating of the motor shall be as per the sizes in the IS. The margin between theinstalled power and absorbed power shall be as recommended by the drivenmachine supplier but shall not be less than the following:Motor Rating7.4NFVP/CTC-TS –E-1Margin above Driven M/cAbsorbed power25%(a)Less than 22 kW(b)22 kW to 55 kW15%(c)75 kW and above10%h)The motors shall have maximum rated duty as per relevant Indian StandardStandards/ IEC. Consideration shall be given for special duty motors. The duty cycleof the motor shall meet the process and driven machine requirement.i)Motors up to 160 kW shall be suitable for operational voltage of 415V, 3-phase,50Hz AC supply.j)All LV motors shall be TEFC type as per relevant Indian Standards/ IEC. All motorsshall be Class-F insulated and selected in such a manner that maximumtemperature (when operating at worst conditions of power supply, worst conditions ofenvironment and delivering the rated load) shall not exceed 120 degree for motors insafe areas and 110 degree for motors in classified areas.k)Normally all the motors shall be suitable for DOL starting.l)All motors rated for output of 30 kW and above shall be provided with space heaters.m)The additional name plate for increased safety motors (Exe) shall also contain“Temperature class”.n)All motors shall be suitable for “Ex-e” (Increased Safety) degree of protection, GasGroup-IIA/II B & Temperature Class-T3.o)All motors having frame size 160 or higher shall be provided with online greasingarrangement.p)All motor shall be provided along with rain protection hoods.LOCAL CONTROL STATIONSa)Local control station (LCS) housing necessary components as per process andoperational requirement, duly wired up to terminal block shall be provided near everymotor. LCS shall be certified for use in the areas of installation.b)A pair of local control station shall be provided for control of each CT fan motor, onenear the motor and other at the base of cell at suitable operating height.c)Local Control Stations shall also conformenclosed with this specification.to the SpecificationSheetd)The enclosure for LCS shall be of die cast aluminum LM—6 and shall be ofincrease safety type. A rain-hood shall be provided as an additional protection. Rainhood shall be of the same material as of the main enclosure. The enclosure shall be

TECHNICAL SPECIFICATIONS OF NIT FORADDITAIONAL COOLING TOWER CELLSTECHNICAL SPECIFICATION FOR ELECTRICALWORKCLIENT : NFL VIJAIPURNFVP/CTC-TS –E-10Annexure-E1REVSHEET 12 OF 44suitable for mounting on wall or on steel structure. 4 Nos. holes suitable for 12 mmbolts shall be provided outside the enclosure for fixing the control stations.7.5e)Each LCS shall be provided with OFF-AUTO-ON Start’ - Stop’ push button,ammeter and indication lamp (LED type).f)OFF-AUTO-ON switch shall be three position control switch with spring return fromON to Auto position & lockable in off position by means of padlock.g)The switch shall have sliding contact between AUTO & ON position. In OFF position,the contact shall be completely broken from (AUTO ) position.h)The ammeter shall be flush mounting, moving coil spring(Taut Band) controlled type,of accuracy class 1.5 as per IS:1248, with square face of minimum size 72 mm x 72mm having scale range 0-240 degree. The ammeter for motor shall be providedwith uniform scale up to CT primary current and compressed end scale up to the6 times the C.T. primary current. Adjustable red pointer shall be provided to indicatethe full load current of the motors. Zero adjusters shall be provided for operationfrom the front of the meter. All ammeters shall be operated through 1 Amp. CTsonly.i)Indication lamp shall be LED type having good illumination in all direction with lumenoutput of minimum 200milliCandla.j)All the components shall be mounted on a base plate inside the enclosure.Necessary actuating system for control switches, non-yellowing acrylic/glasscover for ammeter and indication lamps shall be provided on the front cover. Nowiring shall be carried out on the front cover.k)Each control station shall be provided with minimum 2 mm thick stainless steelname plates indicating the code number and description of the equipment controlledby it. Similar labels shall be provided for all indication lamps, push buttons, controlswitches. The name plate and label shall be fixed with screws only.l)For all other specifications, refer NFVP-CTC-2013-TS-0817 attached.JUNCTION BOXES1)The junction box intended for looping of the lighting cables (if required) shall besuitable for mounting on structure or wall and shall be complete with(a)mounting accessories,(b)required numbers and sizes of flameproof double compression type2aluminium cable glands suitable for 2.5 sq. mm copper conductor PVC-AFRLS PVC cable,(c)required numbers of 240 V, 16 A rated terminals fitted on DMC mouldedterminal block with shorting links,(d)Two external earthing terminals (one outside and one inside) etc.2)All unused cable entries shall be sealed with FLP & Exe threaded plug.3)The Junction box shall be increased safety (Exe) type with temperature class T3having minimum degree of protection equivalent to IP: 654)For all other specifications, refer NFVP-CTC-2013-TS-

demand. 1.6 Preparation & Submission of test reports and cocoordinating for inspection and clearances from - . 2.2.5 Preparation of all drawings/ documents, erection & commissioning manuals, operation & maintenance manuals, formats for tests/ checks to be con