General technical specification for construction

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GENERAL TECHNICAL SPECIFICATION FOR CONSTRUCTION

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1. Introduction R-APDRP is a Govt. of India initiative to renovate and modernize the electricity power

distribution system of urban India in order to reduce the AT&C losses and improve the

quality of power supply to the consumer.

2. Scope of work

Details of the works involved

Supply, transit storage, erection, testing, commissioning of all major and minor

equipments:

1. 33 kV sub-station

• New 33/11 kV Sub Stations.

• Augmentation of capacity by replacing the old or by providing additional power

transformer at existing 33/11 kV Sub Stations.

• R & M of existing 33/11KV substations.

• Installation of Capacitor Banks at 33/11 KV Sub Stations.

2. 33kV Line

• New overhead lines and underground cables.

• Bifurcation and Reconductoring of existing lines.

3. 11/0.433 kV sub-station

• New 11 kV Sub Stations.

• Augmentation of existing transformers.

• R & M of existing 11 KV sub stations.

4. 11kV Line

• New overhead lines and underground and overhead cables.

• Bifurcation and Reconductoring of existing lines.

5. LT Line

• New lines from distribution transformers.

• Extension of existing lines.

• Reconductoring and strengthening of existing lines.

6. Aerial Bunched Cable

• Installation of Aerial Bunched Cables in populated areas.

7. Capacitor Banks

• Installation of capacitor banks.

8. Trolley Mounted transformers.

• Assembly and supply.

The scope shall cover complete installation of all equipment and accessories

covered under this contract.

3. Execution

All the works indicated above are to be carried out complete in all respect on Turnkey

basis within the specified time.

4. Bill of Quantity

(BOQ)

1. The quantity of material required for these works has been described separately in

the Bill of Quantity (BOQ) annexed with this tender document.

2. Quantities indicated in the BOQ are tentative. The actual quantities shall depend on

the actual site conditions. Therefore the contractor shall procure the material only

after ascertaining the revised bill of quantity, approved by the CEO. The payment

shall be made accordingly.

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3. The additional quantity of items which are mentioned in BOQ shall be arranged by

the contractor at unit rates given in price schedule.

4. However some items which are not mentioned in BOQ, may be required essentially

to complete the works. These items shall also be arranged by the contractor and no

extra amount shall be made on this account.

5. Pre Tender Survey

& Site Visit

1. It will be mandatory of the bidders to conduct pre tender survey of the sites and for

that they should visit every proposed 33/11 KV Substation and other works site &

also see the tentative line routes to assess the quantum of work.

2. To access the quantum of work before quoting the price bid, tenderer shall contact

respective Superintending Engineer/Executive Engineer of town who is designated

as Chief Executive Officer for R-APDRP.

6.

Procurement of

Material and

Equipment

1. The contractor has to make his own arrangements for procurement, supply and use

of materials as per requirement.

2. In procurement of these items the contractor shall follows all regulations of the

UPPCL/UP govt. / Government of India in respect of import license etc., if he

chooses to procure these from imports.

Further, the contractor shall be responsible for the payment of applicable duties

and taxes, port clearance, inland transportation etc.

3. Manufacturers test certificate for these materials shall be submitted and got

approved by Engineer of the contract, before utilization. The materials so supplied

by the contractor shall be guaranteed as per addenda/corrigenda of Form „ A‟.

7. Accessories

1. This being a Turnkey contract, successful installation, commissioning & integration

with existing system, of those equipment/accessories/material not specifically

mentioned in the specifications, shall be the responsibility of contractor. No extra

payment shall be made for these inherent works.

2. He shall also supply all other associated equipment/ material/accessories not

specifically mentioned in this tender specification but are required for successful

and trouble free operation of the executed work as a whole. For that no extra

payment shall be made to the contractor.

3. This also includes insulators, cross arms, hardware, jumpers, cable racks, GI

strips, junction boxes, lugs, clamps, connectors, earthing rods, hardware fittings,

angles and channels and all other unforeseen items whose prices are not indicated

in the price schedule.

4. Contractor shall be supplying suitable size jumpers/ droppers/any other item,

needed for connecting equipments with existing equipments.

8. Technical

Standards

1. The electrical equipments and materials required during erection should be of high

standard. Technical features of these equipments and materials must conform to

the technical specification given in this bidding document. Wherever the same is

not specified, it must conform to the relevant I.S for that material.

2. Materials conforming to other international standards, which ensure equal or higher

quality than the standards mentioned above, shall also be acceptable. In case the

bidders who wish to offer materials conforming to other standards, salient points of

difference between standards adopted and specific standards shall be clearly

brought out in the respective schedule. Four copies of such standards with

authentic English version shall be furnished along with the offer.

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3. Whenever a material or an article is specified or described by the name of a

particular brand, manufacturer or trade mark, the specific item shall be understood

as establishing type, function and quality desired. Products of other manufacturers

may also be considered, provided sufficient information is furnished, so as to

enable the owner to determine that the products are equivalent to those

mentioned.

4. Materials supplied/used shall conform in all respects to the relevant Indian

Standard Specification with latest amendments there to.

Title IS No.

1. Cement IS 269

2. Steel IS 6003/1970

3. Fasteners IS 6639/1972

4. Concrete mix IS 1343

5. RCC IS 456

6. Cable laying and jointing IS 1255

5. Installation work pertaining to equipment, cabling etc should be in accordance with

the applicable standards, safety codes etc.

9.

Quality Assurance,

Inspection &

Testing (QA&I)

The major equipments/material supplied by the contractor or its sub vendor has to be

got inspected and tested by the Engineers of the Corporation for its quality and quantity

before dispatch to the work site.

The contractor shall have to follow the procedures laid down with this tender

specification or any other procedure intimated later on.

Rest of the equipments/ materials shall be checked at site for dimensions, weights,

finish and quality. For this purpose the contractor shall have to provide general

measuring equipments like steel tape, vernier calipers, screw gauge, tong tester, earth

resistance tester, 2.5 KV meggar etc.

The following items shall be inspected/tested at the manufacturers premises before

dispatch:

1) Transformers

2) 33 kV Lightening Arrestors

3) 33 kV VCB

4) 33 kV control panels

5) 11 kV VCB panels

6) 33 kV CT

7) 33 kV PT

8) 33 kV Isolators

9) All types of power cables

10) TPMO

11) D.O. fuse set

12) Distribution Pillar Box

13) TVMs

14) Aerial Bunched conductors

15) ST Poles

16) Conductors

17) Transformer trolley & connecting system

18) Battery & Battery Charger

19) 11 kV Capacitor Banks & panels

20) Metering Cubicles

21) 11 kV outdoor type combined CT- PT metering unit with meter box.

22) GI & GSS wire

23) Distribution Boxes/Kiosks used for tapping the connection from Aerial Bunched

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conductor.

24) LT Distribution Pillar Boxes and fuses

25) All other items required for completion of work

10. Approaches The approaches to site of work, if necessary, shall have to be made by the contractor at

his own cost so as to get easy access for both personnel and equipments.

11. Water And Power

Supply

The Contractor has to make use of the water supply if available at any of the substation

site for construction purpose. However transport of water from the source to the working

area will be contractor‟s responsibility.

It is essential that the contractor shall prevent misuse of wastage of water at all time,

failing which necessary charges will be collected from the contractor. In case, water is

not available at site, the contractor has to make his own arrangement and any extra

claim on account of this will not be entertained.

Power required for construction will be made available on demand at one point for

which payment shall be made by the contractor.

12. Men, Material &

T&P

1. The contractor shall himself arrange all men & material, all constructional T & P

and any other material required for successful and speedy execution of the job

within the prescribed time

2. All tools, welding equipment, crane, scaffolding, rigging materials, ladders,

consumables, hardware etc. required for installation shall be arranged by the

contractor.

3. The contractor shall provide experienced, technically qualified, and supervising

Engineers for supervision. The contractor shall engage only competent skilled

workers.

4. The contractor shall observe strict adherence to the existing labour laws.

13. Site Storage/

Transportation

1. It shall be the responsibility of the contractor to store, move/transport from

stores/storage yard etc., relevant items and accessories to the place of installation

wherever necessary he will assemble all parts of equipment. In accordance with

the specific installation instructions as directed by Site Engineer.

2. The stores should be dismantled and site cleared after the work is completed

14. Co-ordination

1. The contractor shall be responsible for overall co-ordination with internal/external

agencies, project management, training of owner‟s manpower etc. as required.

2. The supplier/ contractor shall open his office in that town and shall co- ordinate with

concerned authorities of respective DISCOM for all the matters pertaining to the

works.

15.

Erection, Testing

and

Commissioning

1. All the works covered under the scope of the tender shall be done in accordance

with the norms defined in urban construction manual of UPPCL, unless the same is

not specifically defined in the specification or with the provisions of Indian Electricity

Rules/Acts/Other Government Rules/Regulations as prevalent at the time of

execution of the job/work.

2. Installation shall be carried out strictly in accordance with the approved drawings

Modifications, if any, required to suit site conditions, shall be carried out only with

the prior approval of the Site Engineer. All such changes shall be incorporated in

“As built” drawings to be furnished by the contractor.

3. Responsibility for successful installation of other equipment accessories,

purchased but not mentioned specifically above, and their commissioning shall be

on contractor. For all such items the contractor shall be supplying all material and

equipment required to accomplish the job complete in all respect.

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4. Installation work pertaining to equipment, cabling etc should be in accordance with

the applicable standards, safety codes etc.

5. The contractors shall themselves be responsible for timely arrangement/

procurement of all the raw materials required for the manufacture of all tendered

items by them/ their and / or by their vendors.

6. While Repairing & Replacing the equipment, if any other equipment gets damaged

due to negligent handling of the contractor the same shall be replaced by the

contractor at his cost to the owner satisfaction.

He shall be responsible for dismantling of defective equipments, there proper

handling and shifting.

Also he shall hand over the old & dismantled equipments/ material to the

purchaser‟s local stores or other sites as per instructions of the CEO for which no

extra payment shall be made.

7. All charges on account of damages/losses/claims/thefts etc. involved under the

conditions laid down above shall be borne by the contractor. It‟s cost shall be

recovered from his bills /security deposits /other assets.

8. In order to avoid hazards to personnel moving around, the equipment such as

Transformer, Capacitor Banks, Switchgears etc. if required to be kept charged after

installation till their commissioning, shall be cordoned off by suitable barriers to

prevent accidental injury to personnel moving around.

9. Where the equipments/ assemblies are supplied in more than one part, the

contractor shall make all necessary mechanical and electrical connections between

the sections. The contractor shall also do necessary adjustment in the alignments

required for its proper operation.

10. Care shall be taken in handling instruments relays and other delicate devices

where instruments and relays are supplied separately they shall be mounted only

after the associated switch gear/control panels are erected and aligned.

11. Precaution: The contractor shall exercise all possible care to avoid damage to

public utilities e.g. water/ sewage pipes telephone and power lines/cable already

existing. In case of any accidental damage during the work, the contractor shall be

responsible to repair/replace the same at his own cost, and shall ensure that the

purchaser is not put to any loss.

12. The contractor shall have to provide proper lighting, barricading, signboards etc. at

the work site as a necessary precautionary arrangement to avoid accident/

damage/ losses to the public /utilities/properties.

13. Site Solution: It may be possible due to some reasons or others that it would not

be possible to work as per the procedure. In such case/cases, the solution to the

problem shall be achieved by the CEO with the consultation of contractor, and the

contractor shall work as per procedure proposed by the CEO. Such cases shall in

variably be informed to the engineer of the contract for which no extra payments

shall be made.

14. Space Constraints: While executing the job it is quite possible that some of the

specified work may not be carried out due to space/land/ other technical constraints

etc. In such case the concerned MD of DISCOM], if required, may divert this work

at some other site or cancel the left over portions of work.

15. The contractor shall ensure that the equipment under erection as well as the work

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area and the site are kept clean to the satisfaction of the Engineer. In case, the

Engineer is not satisfied about the cleanliness he will have the right to carry out the

cleaning operations and expenditure incurred in this regard will be to contractor‟s

account. Packing cases and packing materials shall be promptly cleared from sites.

16. Civil Works

The contractor shall also be responsible for constructing all the plinths &

foundations and other switchyard structures & equipments. In case of any

modification required for these at existing 33/11 kV substation, the contractor shall

carry out the necessary work. The payment for all these activities shall be governed

by the price schedule under the head „ELECTRICAL WORKS‟.

17.

Schedule of work

completion/ PERT

Chart/Bar Chart

1. The complete work mentioned in the specification shall be completed within

completion period mentioned in Special Condition of Contract from the date of

awarding the contract.

The survey of each and every site of the work shall be completed within fifteen

days time by the contractor.

2. The contractor shall estimate the actual quantities of equipments / material required

to complete the work to the full satisfaction of respective DISCOM and as per

Urban Construction manual of UPPCL and get it approved from the CEO.

3. The contractor shall submit the „PERT‟ chart for complete execution of work at the

time of signing the contract agreement as per completion schedule of contract.

This PERT chart shall include all the activities such as design, engineering,

approval of drawings and vendors, procurement, manufacturing, erection, testing

and commissioning.

4. After placements of the orders with the manufacturer, the delivery of equipments

should be so regulated that it is received at the site nearly 15 days prior to its

erection.

5. The delivery of material/equipments being received at site, should be strictly

regulated with the schedule of its erection.

6. The payment of material shall be justified by the CEO with the physical progress of

the corresponding work.

7. Precaution should be taken, not to increase the inventory of the owner without

actually utilizing it at the site for a long time.

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18. 33kV Sub-station New 33/11kV Sub-station

18.1 Scope Design, engineering, supply, transit storage, supply, erection, testing, commissioning of

all equipments of a new 33kV sub-station of specified capacity on turnkey basis.

18.2

Drawings and

Layout Plan

All the equipment described, various technical specifications annexed hereafter shall

have to be erected as per layout plan & drawing to be submitted by the contractor and

duly approved by the CEO.

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The drawing of earth mat, earthing system, the transformer plinths, the foundations of

all equipments & their support structure are to be approved by CEO and the

construction work shall be taken up by the contractor accordingly.

The layout and placement plan of equipments in switchyard and in the control room is to

be prepared by the contractor as per actual space available at site and also get it

approved by CEO.

18.3

Earthing

1. Chemical Pipe earthings are generally used for earthing of equipments at 33/11 kV

substations.

2. Similar earthing will be used in station transformer.

3. All accessories associated with transformer and mounted away from the main tank

shall be connected to the station – earthing grid at minimum two points.

4. Electrode earthing shall be connected with the substation earth mat.

18.4 Earthing

Switchyard

1. Designing the earth mat of the switchyard including diameter of the MS Rod,

spacing of the rods etc so that the specified value of the ground resistance (as per

ISS/EEE) in no case exceeds 1 ohm.

2. Laying of proper earth mat at the switchyard as per UPPCL standard, providing

pipe & electrode type earthing, connecting of these earthing to the equipment e.g.

transformer, LA, CTs, PTs etc. as per standard practice shall be the responsibility of

the contractor.

3. The earth mat & earthing work shall include laying mesh, fabrication and driving of

2500 mm. long 32 mm diameter earth electrodes, connecting the same to the earth

mat points of all the equipments installed in the outdoor as well as indoor and the

fencing. All the jointing shall be done by electric arc welding.

4. The earth mat mesh made of M.S. Bar shall be laid crisscross as per standard

practice of RESSPO applicable to the particular site and as per directives of

representative of respective DISCOM.

5. The earth mat mesh should at least be 0.75 Mtr. below the make up ground plinth

level of switchyard. The earth electrodes shall have to be fabricated and driven into

the ground upto its full length in the manner that its top, is at least 750 mm below the

make up ground / plinth level. These electrodes shall be properly jointed with earth

mat mesh by way of electric arc welding.

6. All the structures of the equipments bus bar gantry and body of the

transformer shall be connected through M.S. G.I. strip and connected to the earth

mat mesh by electric arc welding.

7. This M.S./ G.I. strip shall have to be suitably shaped, bent and jointed as per

directive of site Engineer of respective DISCOM to give uniform shape above the

ground level.

8. The minimum length of contact of the earthing strip and the equipment /

structure should be 100 mm. in length.

9. The power transformer neutral shall be earthed through independent pipe in pipe

type earthing and also jointed independently with the earth mat through M.S./ G.I.

strip duly welded. These electrodes shall then be connected to independent M.S. /

G.I. strip riser over M.S. Angle Iron support duly grounded and connected to neutral

of the transformer through independent flexible copper bound of sufficient current

capacity. The angle and M.S./G.I. strip required for transformer neutral earthing shall

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also be bent / welded in proper shape as per directive of the site Engineer.

10. Transformer tank shall be earthed at two places to the station-earthing grid.

The transformer neutral terminal shall be connected to the horizontal extension of

the vertically grouted galvanized M.S. steel angle through flexible copper bound

strip of adequate cross section and size.

The vertically grouted angle frame in turn shall be solidly connected & welded to two

pipe earth electrodes in the earth pit providing adequate level of earthing i.e.

earthing resistance below prescribed level.

All accessories associated with transformer and mounted away from the main tank

shall be connected to the station earthing grid at minimum two points.

11. The fencing shall also be connected with the main earth mat mesh by means of

M.S. / G.I. strips at an interval of 10 Mtrs. (Approx.). After making joints / welding,

each joint shall be protected by coating the weld with molten bitumen.

18.5 Switchyard

Structure

1. All the switchyard structures shall have to be fabricated as per RESSPO manual of

drawing or firms drawing approved by respective DISCOM.

If required, modification in the structure to match with the related equipment and

ground level shall have to be carried out by the contractor.

Any special structure if required, shall also be fabricated as per directive of the site

Engineer of RESPECTIVE DISCOM.

The fabrication includes cutting, bending, drilling and welding as per requirement

and includes all associated incidental activities.

No extra payment shall be made for all such fabrication work.

2. The 11 KV cable joint support structure is to be fabricated by the contractor for

connecting the cable to the transformer terminals in case of 10 MVA transformers

this structure shall be designed to hold two nos. 3 X 300 Sq. mm. Size XLPE cable

with joints

18.6 33kV BUS BAR

1. 33kV main bus bar shall be of Panther conductor while the dropout jumper shall be

of Dog conductor.

2. The stringing and sagging of 3 Phase bus bar in the switchyard shall be done by the

contractor as per approved drawing.

3. ACSR panther conductor, all fittings, Tee, P.G. clamps insulators; stays are to be

arranged by him without any extra payment.

18.7

Bus-Bars

Connectors and

Clamps

1. The suitable size of aluminum connectors/ Bi-metallic connectors shall be used for

making connection to the equipment terminals.

2. The surface of the clamps shall be smooth with all edges rounded off. The Tee &

P.G. connectors shall be conventional type extra heavy-duty class tested.

3. The connectors shall have maximum contact surface with the conductor, extremely

low and stable contact resistance and minimum power loss.

4. These shall maintain constant force within the connection for the life of the

connector/ clamp while compensating for thermal expansion or grip and increased

life span.

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5. An Oxidation inhibitor shall be applied to the surface thereby elimination of oxidation

of metallic surface.

6. The jumper T-clamp is required for connection of drop down type single conductor

jumpers to bus bars and equipment.

7. The normal current carrying capacity of clamp shall not be less than that specified in

the specification.

8. These connectors shall be used instead of the conventional PG and Tee clamp and

shall be installed by powder actuated tool using cartridges with valid explosive

license issued by Govt. of India /State Govt.

9. Clamps shall be corona free and shall carry an overload of at least 20% over the

rated current of 250 A.

18.8 Painting

All the steel structures shall be painted with Aluminium paint as per standard practice.

The earthing strips shall be painted with green enamel paint.

18.9 Battery & Battery

Charger

The battery and battery charger along with D.C. and A.C. distribution board are to be

erected in the sub-station control room and are to be tested and commissioned.

All A.C. and D.C. wiring for the same is to be done by the contractor.

18.10 Control Panels and

Switchgears

All the control and switchgear panels are to be properly grouted, erected at the

prescribed locations in the control room as per approved layout.

All the A.C. and D.C. connections are to be made complete in all respect.

All the functions / system provided in these panels should be tested and

commissioned by the contractor.

18.11 Control Cable

The contractor shall be responsible to connect all protection and indicating devices of

the transformer the control / relay panel in the control room including assessment of

requirement of various size cables, supply and laying of required size standard make

copper control cables properly dressed and ferruled.

While carrying our settings of various protection schemes, contractor shall be

responsible for protecting cables against short circuits and earth fault etc. by suitably

designing & placing necessary protections.

18.12 Control Cable

Trench

The control cable trench and power cable trenches shall be constructed separately

providing proper cable racks.

The control cable trenches shall be 300 mm. deep. It should be 150 mm. wide.

These control cable trenches shall have cable-supporting racks made of M.S. strips.

These trenches shall be covered with welded frame type trench covers of 500-mm.

length. The size of control cable to be laid by the contractor shall be 2 core, 4 core and

6 core of minimum 2.5 sq. mm. cross section

18.13 Power Cable &

Termination Kits

The 33 KV and 11 KV 3 core XLPE power cable shall be governed by the detail

technical specification given in tender document.

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The terminations of XLPE power cable shall be properly jointed using standard make

heat shrink type termination kits which are to be supplied by the contractor himself.

18.14 Station

Transformer

Station transformer shall be supplied, erected and commissioned on the double pole

structure of 9.0 mtr. or on the plinth of 33/11 kV substation in switchyards.

The work includes supply & erection of 11/0.4 KV 63 kVA transformer, double pole,

channels, angles, GI pin with insulators, ladder frame, clamps with packing pieces,

nuts, bolts off size including all the materials and the grouting, plinthing, painting etc.

of double pole.

The transformer shall be energized through 11 kV 3x35 sq.mm. XLPE cable

emanating from 11 kV station transformer panel. One outgoing cables of 3.5x70

sq.mm. shall be used to connect to AC distribution board. Other Ckts. As required

shall be taken from there.

The cost of all the above mentioned work shall be covered under the relevant column

of the price schedule.

Installation of 11 kV TPMO & DO fuse set shall be made, as per the prices quoted for

these items in the price schedule.

18.15 Control Room

Building

The construction of main control room building is also included in the scope of work

under this tender. The control room building shall be constructed as per norm of

respective DISCOM. The land for switchyard shall be made available by respective

DISCOM. The contractor shall be responsible for carrying out civil work in respect of

plinths, foundation & support structure related to the equipments, and construction of

cable trenches, the cost of which shall be included in the cost of equipment quoted by

the contractor.

Note: What about boundary and approach road etc?

18.16 Lighting

The control room and the switchyard are to be illuminated adequately to have clear

visibility at every point.

1. The switchyard and control room lighting shall be governed by detailed technical

specification given in the tender document.

2. Contractor shall be responsible for calculating the number and type of light fittings

required for achieving sufficient visibility after taking control room and switchyard

size in consideration. The number and type of fittings shall be decided based on the

switchyard area to be illuminated in consultation with Purchaser.

3. Contractor shall be responsible for supplying light fittings and fixtures, laying and

terminating of the suitable power cable from the distribution board to the respective

light fittings.

4. In case a junction box is to be installed in the switchyard, its supply, erection

including terminal blocks shall be to contractor's account.

5. In control room, the illumination fittings and fixtures shall be so located that sufficient

illumination is available in and around C&R panels.

6. The concerned CEO has discretion to divert some of the lighting fixtures to other

substation site if so required. The contractor shall execute the work accordingly.

18.17 Substation T& P

Supply of the following set of T&P (ISI marked if applicable) at each of the 33/11 KV

substations mentioned in BOQ: One sample of these T&P shall be submitted before

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supply to respective DISCOM for approval. Only after getting the approval of the

sample T&P shall be supplied.

i. Chain pulley blocks 4 Ton capable of lifting upto ten feet. -1 number

ii. Tirfur capable of pulling 5 Ton load.-1 number

iii. Hand Gloves free size- 2 sets

iv. 1 no. Tool Box carrying: pliers of different types, set of various screw drivers,

wire stripers, wire crimping tool of various sizes (4 sq. mm. to 400 sq. mm.),

slide wrench, nose plier, ratchet spanners of various sizes, power operated drill

machine, power operated grinders, box spanners, various sizes and type of

files, hexas. Also one no. each of the following instruments of standard make

Motwane/ Meco/ Riken etc.

a) Motorized cum manually operated 5 kv megger & digital multimeter

b) Tong tester capable of measuring both DC and AC voltages upto 0.5%

accuracy. It should measure A.C. upto 1400 Amps. and its loop size should

be large enough to insert 100 mm. dia cable in it comfortably.

v) Torch of three cells. – 2 numbers.

vi) Set of drill bits for metal and concrete – 1 set

vii) Slings of 2 meter and 6 meter sizes capable of carrying 5 ton load. – 1 set.

18.18 Fire Fighting

System

All the equipments in the yard and control room, including oil filled equipments, are to

be protected by portable fire extinguishers. These fire extinguishers are to be put at

appropriate locations in and around control room and switchyard at specified

locations. The quantities of portable CO2 and DCP type fire extinguisher to be

installed at one substation shall be governed by detailed technical specification given

in the tender document. The payment for the same shall be made as per price

schedule. The contractor must quote the refilling charges of the extinguisher in the

schedule of spares annexed in the tender documents.

4 baskets filled with stand and all baskets filled with sand

R&M OF EXISTING 33/11 KV SUB STATION

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19. 33kV Sub-station R&M Of Existing 33/11 kV Sub Station

19.1 Scope

1. Design of substation and R&M of associated electrical & mechanical auxiliary

systems includes preparation / modification of single line diagrams and electrical

layouts, erection key diagrams, electrical and physical clearance diagrams, design

calculations for Earth mat and Direct Stroke Lighting Protection (DSLP), Bus Bar,

control and protection schematics, wiring and termination schedules, civil designs

and drawings of foundation, repairing and maintenance of cable trenches and

galleries etc., fire fighting, indoor and outdoor lighting/illumination and other relevant

drawings and documents required for engineering of all facilities.

2. Replacement of missing / damaged items like Circuit Breakers, Isolators, Instrument

Transformers, Lightening Arresters, associated / required foundations and support

structures, Control Panels, control cables, 11 KV VCB, 11 KV Cables, 24 volt

Battery System, Fire Fighting Equipment, Earthing, Lighting, Yard Fencing, Bus Bar

extension etc.

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3. The erection of equipments / accessories in the existing sub-station / bays, either

supplied by the contractor or by owner/employer, with suitable modification on

existing foundation / structures, if required.

For erection of equipment involving new foundation and structure also, the payment

shall be governed as per the rates indicated in BID PROPOSAL SHEET.

The number of items and places where the equipment need to be installed are only

tentative and are given in BOQ.

4. Matching of alignment and positioning of the new equipments with the substation

layout so that they may not foul with other structure.

5. Re-orientation of Bus Bar.

6. All the connections to bare conductor bus bar, as per requirement, including

necessary clamps and connectors and their fixing / erection.

7. Supply of suitable size jumpers/droppers needed for connecting the equipment with

existing equipments in the bay.

8. Proper earthing of all the equipments and their support structure and connecting

them to the main earth mat so as to meet overall safety criterion.

CAPACITY AUGMENTATION OF 33/11 KV SUB-STATIONS

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Particular Detail

20. 33kV Sub-station Capacity Augmentation of 33/11 kV Sub-stations

20.1 Scope

1. By replacing existing transformer with higher capacity transformer.

i. The new transformers are to be preferably accommodated at the same foundation

where previous transformer existed or new plinth to be constructed by the contractor

at the place having appropriate load bearing capacity.

ii. Checking of the physical dimension available, at each existing sub-station and

design the 33/11 kV transformers accordingly so that it can fit into the available

space (of older transformer). Contractor must also ensure that all statutory

clearances are met in case the design of the transformer tank is changed.

iii. Removing of existing lower capacity transformer from its foundation and

commissioning the same at another location in the circle as required.

iv. If transformer is transported without oil then assembly & erection of the transformer

including its accessories, filling of oil into the transformer which was separately

transported to site in drums after proper filtration & testing of the oil.

20.2 Sequencing of

work

1. Before taking up of the Augmentation job of 33/11 kV substation, contractor shall

discuss with the engineer to finalize the sequencing of the taking up of

augmentation of capacity of 33/11 kV transformers.

2. The preferred sequence shall be to start with the augmentation exercise at the

places where new 10 MVA, 33/11 kV transformers are to be installed.

20.3 Power Cable

Supply and proper laying the power cables from control room to the transformer (if

they are non-existent or damaged) either through existing cable trenches or the

trenches to be constructed by the contractor.

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Sl. No.

Particular Detail

20.4

Control Relay

Panel

& Control Cable

1. To develop the design & drawing of foundation and cabinet for housing all control &

relay equipment and to obtain the approval for the same from owner.

2. To access, requirement of control cables (various sizes) its supply and laying

required for extending it from C&R panel to various equipments. For that whatever

hardware contractor envisages including terminal blocks and cable glands, shall be

in the scope of contractor.

3. C&R panel should use 24 Volt as control and protection auxiliary voltage. Contractor

shall be responsible for supplying, laying and commissioning of control cable from

24 Volt distribution panel to C&R panel.

4. To arrange 240 volt auxiliary supply of 240 volt 50 Hz, for illumination, lighting and

heating of C&R panel from the AC distribution board including supply of cables &

connectors etc.

5. Commissioning of the C&R panel including interlocking with isolator, remote

indication, open and close operation.

20.5

24 Volt DC Battery

and Battery

Charger

1. Supply and laying of suitable sized power cable, its clamps and connectors in order

to connect battery and battery charger to DC distribution board.

2. Battery bank and battery charger of 24 Volt 200 AH capacity.

3. Supply, laying and commissioning of 1-Phase 240 volt. Power cable from AC

distribution board to battery charger for Power input to the Battery charger.

4. Use of existing trench if available or else to make way of laying power cable to

battery charger.

20.6

11kV I/C and O/G

Circuit Breaker

Modules

1. Design and drawing of modules including their foundation drawings, for fixing the

modules (both I/C & O/G) in the module space, or in the space created by the

contractor.

2. Alignment of the existing bus bars and the proposed I/C and O/G modules of the

new Circuit Breakers must match the existing bus bar and switchgears.

3. Supply and laying adequate sizes of 3 phase 33kV XLPE cable, required for

extending the 11 kV supply from 33/11 kV transformer output to 11 kV switch gears

and from 11 kV switch gears to the first double pole of the feeder line. The cabling

work includes supply of heat shrink type termination kits and their jointing at either

end as mentioned in BOQ/ Annexure.

4. Contractor may use existing trench, if available, else he may have to make separate

trench for laying 11 kV power cables required for I/C and O/G modules.

5. Supply and laying of 240 Volt 50 Hz 1-Phase auxiliary supply cable which shall be

used for closing circuit of 11 kV circuit breakers. Arrangement of this supply from

AC distribution board.

6. Laying and connecting 24 Volt supply from DC distribution board to the respective

I/C and O/G modules, which shall be used for operation of the respective Circuit

breakers.

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Sl. No.

Particular Detail

20.7 Lighting Arrestor

(11kV Rating)

11kV Las are to be erected on double poles of outgoing feeders. They shall be

preferably mounted, where the 11kV cable is connected to overhead line.

The above LAs shall be properly earthed by pipe type earthing.

20.8 Fire Fighting

System

1. All the equipments in the yard and control room, including oil filled equipments, are

to be protected by portable fire extinguishers. These fire extinguishers are to be put

at appropriate locations in and around control room and switchyard.

2. Calculation of the number and type of fire extinguishers required for covering fire

hazard of control room, switch yard, oil filled equipments and cable trenches shall

be approved by CEO.

3. Supply of fire extinguisher for taking care of different category of fire hazards

4. Supply of the fire extinguisher shall be paid as per the provisions of the BID

PROPOSAL SHEET. For refilling the extinguishers the payment shall also be

governed as per the rates indicated in BID PROPOSAL SHEET.

The Portable CO2 and DCP type fire extinguisher shall be governed by detailed

technical specification given in the tender document.

20.9 Lighting

1. The control room and the switchyard are to be illuminated adequately to have clear

visibility at every point.

2. To calculate the number and type of light fittings required for achieving sufficient

visibility after taking control room and switchyard size into consideration.

The number and type of fittings shall be decided based on the switchyard area to be

illuminated in consultation with CEO concerned.

3. In case contractor wishes to use existing mountings (if found any), in that case if

any modification / alteration required shall be to contractor‟s account.

4. Supply of light fittings and fixtures, laying and terminating of the suitable power

cable from the AC distribution board to the respective light fittings.

5. In case a junction box is to be installed in the switchyard, its supply, erection

including terminal blocks shall be to contractor‟s account.

6. In control room, the illumination fittings and fixtures shall be so located that sufficient

illumination is available in and around C&R panels.

20.10

Earthing of the

sub-station

1. Designing of the earth mat of the switchyard including diameter of the MS rod,

proposed to be used, spacing of the rods etc so that the specified value of the

ground resistance (as per IS/IEEE) can be achieved. The value of earth mat

resistance in no case should exceed 1 ohm.

In case the desired results are not achieved, a new earth mat after removing older

earth mat has to be laid.

Cost for the same shall be borne by contractor.

2. Designing of the electrode earthing of the LAs, PTs Lightening Mast & Pipe

electrode for power transformer and shunt capacitor keeping in view the specified

value of the electrode earth resistance and to connect the electrode earth pits with

the switchyard earth mat.

3. On checking of the earth pit resistance of the transformer, LAs and PTs., in case the

pipe type earthing resistance comes out to be more than 4 ohm, a new pipe type

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Sl. No.

Particular Detail

earthing of the above mentioned equipments and its connection to station ground

mat has to be done.

4. The supply and laying of new as well as strengthening of the existing earth mat shall

be paid as per the provisions of the BID PROPOSAL SHEET.

5. To achieve the target value of the ground mat resistance.

6.. In view of the safety requirements, electrode type earthing for transformers, LAs,

PTs and shunt capacitor bank shall be done first before taking up the earth mat

work.

20.11 Sub Station T&P As given at 18.17 above

20.12 Civil Work

1. All civil works like foundation & support structure related to the equipments being

supplied. In case of existing civil works at 33/11 kV substation, any change /

modification felt necessary by the engineer, shall be got executed and the cost for

the same shall be included in the equipment price quoted.

2. The older construction including debris, wherever required has to be removed.

3. Designing of the all such civil works including construction drawings which are to be

approved by the owner.

4. RESSPO/Urban schedule for civil work will be applicable

20.13

Bus-bars,

Connectors and

clamps

As given at 18.7 above

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GENERAL SPECIFICATION FOR CONSTRUCTION OF

33Kv/11Kv/COMPOSITE/LT LINES)

Sl. No.

Particular Detail

1. Survey and Pole

Spotting

1. Before taking up the line construction work the contractor shall verify the

proposed line route by jointly surveying with the representative of the concerned

CEO.

2. The exact spotting of the single and multiple structures have to be finalized by

the contractor in consultation with the concerning CEO. Topographical maps of

the survey of India shall not be provided for this purpose.

3. The final schedule indicating location of poles, angle of deviation, road crossing

and other details shall be submitted for the approval to the concerned CEO/ S.E.

(D), EUDC/EDC.

4. After approval the contractor shall submit four more sets of the approved reports

along with one set of reproducible of final profile drawing to the Engineer of the

Contract for record purpose.

2. Span

1. The span of the line for 33kV and 11kV shall be 50 to 60 M.

2. Span in case of composite line (11kV and LT), shall not exceed 60 mtr.

3. Span in case of LT line shall also be 50 mtr.

3. Right of Way

Right of way and necessary way leave clearance shall be arranged by the contractor

on behalf of respective DISCOM in accordance with the work schedule. The

contractor will arrange to secure way leave and Right of way in the restricted area with the help of RESPECTIVE DISCOM. Any expenditure to be incurred shall be

borne by the contractor.

4. Road Crossing

At all important road crossing the poles shall be fitted with Disc type insulator but the

ground clearance at the roads under maximum temperature and in still air shall be

such that even with conductor broken in adjacent span, ground clearance of the

conductor from the road surface will be as per IE rules1956 as amended from time to

time and proper cradle guarding to be provided across the road.

5. Railway Crossing

At the time of route survey, the railway crossings shall be finalized as per the

regulation laid down by the Railway Authorities. The following are the important

features of the prevailing regulations (revised in 1987):

(i) The crossing shall normally be at right angle to the railway track.

(ii) No crossing shall be located over a booster transformer, traction switching

station, traction sub- station or a track cabin location in an electrified area.

The approval for crossing railway track shall be obtained by the Contractor from the

Railway Authority on behalf of respective DISCOM. The letter to this regard shall be

obtained by the Contractor from officer concerned of respective DISCOM and

expenditure thereof will be paid by the contractor.

6.

Power Line Crossing

and Tele

communication line

Where line is to cross over another line of the same voltage or lower voltage.

Provisions to prevent the possibility of its coming into contact with other overhead

lines shall be made in accordance with the Indian Electricity Rules, 1956 as amended

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Sl. No.

Particular Detail

crossing from time to time.

All the works related to the above proposal shall be deemed to be included in the

scope of the contract except in case, if modifications are required in the line below or

above, the line being crossed. In such cases, work shall be done on the conditions

agreed upon.

The angle of crossing shall be as near to 90 degree as possible. However, deviation

to the extent of 30 degree may be permitted under exceptionally difficult situations.

Also, in the crossing span, power line support will be as near the telecommunications

lines as possible, to obtain increased vertical clearance between the wires.

When the angle of crossing has to the below 60 degree the matter will referred to the

authority in charge of the telecommunication system. The contractor shall obtain the

letter from of respective DISCOM and permission of telecommunication authority shall

be obtained by the contractor on behalf of respective DISCOM.

Methods ensuring that normal services may not be interrupted nor damage caused to

property shall be used during stringing operations, where roads, channels,

telecommunication lines, power lines and railway lines have to be crossed.

However shut down shall be obtained when working at crossings of overhead power

lines.

7.

Clearance from

Ground, Building,

Trees etc.

1. While constructing the 33 & 11 kV lines on roadside having inadequate electrical

clearances between pole & buildings the feasibility of fixing projected bracket

fabricated by suitable size of M.S. Angle & Channel with its supporting bracing on

the existing poles may be explored. In case it becomes feasible, the line may be

erected on fittings & insulators to be fitted on such brackets.

The cost of these brackets shall be charged as per the prices quoted in the

relevant column of price schedule.

2. Clearance from ground, building, trees and telephone lines shall be provided in

conformity with the Indian Electricity Rules, 1956 as amended upto date.

3. Any way leave which may be required by the contractor shall be arranged by him

on behalf of respective DISCOM.

4. Payment of compensation if any towards the clearance etc. will be the

responsibility of the contractor.

8. Statutory Regulations

And Standards

1. The contractor is required to follow local statutory regulations stipulated in

Electricity (Supply) Act 1948, Indian Electricity Rules 1956, or as amended and

other local rules and regulations referred in this specification.

2. The codes and/ or standard referred to in the specifications shall govern. Such

codes and/ or standard, referred to shall mean the interest revisions,

amendments, changes adopted and published by the relevant agencies unless

otherwise indicated.

3. Other internationally accepted standards which ensure equal or better

performances than those specified shall also be accepted, subject to prior

approval by the CEO, respective DISCOM.

9. Erection of poles

1. The pits are excavated in the direction of line as this facilitates erection of pole in

addition to giving natural stability. The depth of pit should be the 1/6 of the height

of respective pole in all type of soil laterite / hard rock and 75 cm being in the

direction of line.

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Sl. No.

Particular Detail

The size of stone pad should be 300x300x75 mm.

5. The pole is to be erected in alignment with utmost care and the excavated earth

should be back filled properly by ramming and concreting in the ratio of 1:4:8

concreting is to be measured separately.

6. Concreting of the support is to done as per relevant drawing enclosed, by a

mixture of 1:4:8 (by volume). The size of the pole plinth is kept as 450x450 mm

and height 300 mm above ground level as per drawing. The top 100 mm is kept

tapered so that no rainwater gets accumulated on the top. The underground

portion of the concreting shall be 450 mm x 450 mm x depth of plantation of

support.

7. Every pole of new line is to be properly grouted by the contractor and plinth be

made around it as per as per UPPCL norms. All the fittings, cross arms,

insulators and stays are to be properly fitted/ erected by the contractor.

10. Insulator Fixing

Pin Insulators shall be used on all poles and disc Insulator on angle and dead end

poles. Damaged insulators and fittings, if any, shall not be used. Prior to fixing, all

insulators shall be cleaned in a manner that will not spoil, injure or scratch the surface

of the insulator, but in no case shall any oil be used for that purpose. Torque wrench

shall be used for fixing various line materials and components, such as suspension

clamp for conductor, whenever required.

11. Earthing

1. Each and every pole of the new 33/11 kV line and every third pole of LT line shall

be properly earthed by the contractor by constructing electrode type earthing

using 5 mm GI wire and 2500mmx20 mm dia MS earthing rod.

2. The cost of the same shall be included in the price quoted for poles/supports as

per standard practice of UPPCL. Detailed drawing no. DD&SO-27 are enclosed.

12. Stringing

1. Stringing and sagging of the conductor and earth wires shall be done properly by

the contractor so that all poles remain erected vertically and no insulator is tilted.

Proper binding of conductor on the insulators and proper tightening of the nut

bolts of the cross arms, bracings, guarding angle and clamps must be ensured

by the contractor.

2. It Includes spreading of conductors without any damage and stringing with proper

tension without any kinks/damage including binding of conductor at pin points,

jumpering at cut points etc.

3. The stringing of the conductor shall be done by the standard stringing method.

4. The contractor will discuss with the concerned CEO/SE (D), EUDC-EDC for the

stringing methods he proposes to follow and obtain their consent to startup the

work.

5. Conductors or earth wires shall not be allowed to hang in the stringing blocks for

more than 96 hours before being pulled to the specified sag.

13.

Fixing of Conductors

and Earth Wire

Accessories

1. Conductor and earth wire accessories shall be installed by the contractor /

earthwire clamping. While installing the conductor as per the design requirement

within 24 hours of the conductor and earthwire accessories.

2. After installing the conductor and earthwire, its accessories shall be installed

within 24 hours.

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Sl. No.

Particular Detail

3. Proper care shall be taken to ensure that the surfaces are clean and smooth and

that no damage occurs to any part of the accessories or of the conductors.

14. Handling Of Conductor

And Earthwire

1. The contractor shall be entirely responsible for any damage to the pole or

conductors during stringing. The conductors shall be run out of the drums from the

top in order to avoid damage.

2. A suitable braking device shall be provided to avoid damaging, loose running out

and kinking of the conductors. Care shall be taken that the conductors do not

touch and rub against the ground or objects, which could scratch or damage the

strands.

3. The sequence of running out shall be from the top to down. i.e. the top conductor

shall be run out first, followed in succession by the side conductors. Unbalanced

loads on poles shall be avoided as far as possible. Wherever applicable, inner

phase of line conductors shall be strung before the stringing of the outer phases is

taken up.

4. When lines being erected run parallel to existing energized power lines, the

contractor shall take adequate safety precautions to protect personnel from the

potentially dangerous voltage build up due to electromagnetic and electrostatic

coupling in the pulling wire, conductors and earth wire during stringing operation.

5. The conductor shall also take adequate safety precautions to protect personnel

from potentially dangerous voltage build up due to distant electrical storms.

6. The conductor shall be continuously observed for loose or broken strands or any

other damage during the running out operations.

7. Repair to conductors, if necessary, shall be carried out with repair sleeves.

8. Repairing of the conductor surface shall be carried out only in case of minor

damage, scuff marks, etc,

9. The final conductor surface shall be clean, smooth and free from projections,

sharp points, cuts, abrasions etc.

15. Replacement of

conductor

If any replacement is to be effected after stringing and tensioning or during

maintenance e.g. replacement of cross arms, the conductor shall be suitability tied

to pole at tension points or transferred to suitable roller pulleys at suspension

points.

16. Jointing

1. When approaching the end of a drum length, at least three coils shall be left in

place when the stringing operations are stopped. These coils are to be removed

carefully, and if another length is required to be run out, a proper joint shall be

made.

2. Conductor joints shall not crack or otherwise be susceptible to damage in the

stringing operation. The Contractor shall use only such equipment /method s

during conductor stringing which ensure complete compliance in this regard.

3. All the joints on the conductor and earthwire shall be of the compression type, for

which all necessary tools and equipment like compressors, dies, etc. shall be

obtained by the Contractor. Each part of the joint shall be cleaned by wire brush

till it is free of rust of dirt, etc, and be properly greased with anti corrosive

compound. If required and as recommended by the manufacture, before the final

compression is carried out with the compressors.

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Sl. No.

Particular Detail

4. All the joints shall be made at least 30 meters away from the pole.

No joints or splices shall be made in spans crossing over main roads, railways and

small river spans. Not more than one joint per conductor per span shall be

allowed. The compression type fittings shall be of the self-centering type, care

shall be taken to mark the conductor to indicate when the fitting is centered

properly.

During compression or splicing operation: The conductor shall be handled in such

a manner as to prevent lateral or vertical bearing against the dies. After

compressing the joint the aluminum sleeve shall have all corners rounded, burns

and sharp edges removed and smoothened.

5. During stringing of conductor to avoid any damage to the joints the contractor

shall used suitable protector for mid span compression joints in case they are to

the passed over pulley blocks aerial roller. The pulley groove size shall be such

that the joint along with protection can be passed over it smoothly.

17. Tensioning And

Sagging Operations

1. The tensioning and sagging shall be done in accordance with the approved work

programme by CEO/SE (D), EUDC-EDC.

The conductors shall be pulled up to the desired sag and left in running blocks for

at least one hour after which the sag shall be rechecked and adjusted, if

necessary, before transferring the conductors from the running block to the

suspension clamps.

2. The sag will be checked in the first and the last section span for section upto eight

spans, and in one additional intermediate span for section with more than eight

spans. The sag also be checked when the conductors have been drawn up and

transfered from running block to the insulator clamps.

3. At sharp vertical angle, conductor and earthwire sags and tensions shall be

checked for quality on both sides of the angle and running blocks. The suspension

insulators assemblies will normally assumed verticality when the conductor is

clamped.

4. Tensioning and sagging operation shall be carried out in calm weather when rapid

changes in temperature or not likely to occur.

18. Clipping In

1. Clipping of the conductor into position shall be done in accordance with the

manufacturer's recommendations.

2. Jumper at section and angle poles shall be formed to parabola shape to ensure

maximum clearance requirements.

3. Fasteners in all fittings and accessories shall be secured in position. The security

clip shall be properly opened and sprung into position.

19. 33kV Guarding

1. Guarding along the line

Two numbers parallel GI wires 6SWG (guarding wires) shall run below the

conductor and shall be supported on M.S. angle of prescribed size.

Cross lacings of GI wire 8 SWG shall be provided at every 4 M. interval

throughout the crossings. The cross wires/ lacings shall be bent in U shape and

their ends shall be clamped with the parallel guard wires by proper binding.

2. Guarding across the road crossing/electric lines/telecommunication line

(as Cradle guarding)

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Particular Detail

Five numbers parallel GI wires 6SWG (guarding wires) shall run below the

conductor and shall be supported on M.S. angle of prescribed size.

Cross lacings of GI wire 8 SWG shall be provided at every 0.6 M. interval

throughout the crossings. The cross wires/ lacings shall be bent in U shape and

their ends shall be clamped with the parallel guard wires by proper binding.

11kV Guarding

1. Guarding along the line

Two parallels GI wires 6SWG (guarding wires) shall run below the conductor

and shall be supported on M.S angle of prescribed size.

Cross lacings of GI 8SWG wire shall be provided at every 1 m interval

throughout the crossing.

Guarding shall be erected with ground & line clearance as per the I.E. rules.

2. Guarding across the road crossing/electric lines/telecommunication line (as

Cradle guarding)

Five parallels G.I. wires 6SWG (guarding wires) shall run below the conductor

and shall be supported on M.S angle of prescribed size.

Cross lacings of G.I. 8SWG wire shall be provided at every 1 m interval

throughout the crossing.

Guarding shall be erected with ground & line clearance as per the I.E. rules.

21. Final Checking, Testing

and Commissioning

After completion of the works, final checking of the line shall be carried out by the

contractor to ensure that all foundation works, pole erection and stringing have been

done strictly according to the specifications and as approved by the concerned

CEO/SE(D), EUDC-EDC.

All the works shall be thoroughly inspected in order to ensure that.

a. Sufficient backfield earth covers each foundation pit and is adequately compacted:

b. All poles are used strictly according to final approved drawing and are free of any

defect or damage whatsoever.

c. The stringing of the conductors and earth wire has been done as per the approved

sag and tension and desired clearance are clearly available.

d. All conductor and earth wire accessories are properly installed.

e. All other requirement for completion of works such as fixing of danger plate and

anti-climbing device (Barbed wire) have been fulfilled.

f. Wherever required, the proper revetment (erosion protection) is provided.

g. The insulation of the line as a whole is tested by the contractor through provision

of his own equipment, labour etc, to the satisfaction of the Owner;

h. All poles are properly grouted.

i. The line is tested satisfactorily for commissioning purpose.

22.

Safe up keep and

transportation of

dismantled material to

stores

All dismantled material e.g. conductor, insulator, poles etc. requires proper handing

and stacking. Dismantled conductor must be re-rolled on the wooden drums to avoid

any damages. All such dismantled materials may be safely transported to respective

DISCOM store and handled over to the authorized representative of respective

DISCOM.

Loses, damages or theft of material during erection, transformation and landing will be

to the account of the contractor. The cost of such damages /losses/ theft will be

recovered in full from the contractor‟s bill or in other bills.

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DETAILS OF OVERHEAD LINE MATERIALS

Sl. No.

Particular Detail

1. Poles

33kV:

1. The 33 kV line shall normally be constructed on pin insulators and 11 m long Steel

Tubular Poles (410-SP-55)/ 9m. long PCC poles using ACSR Dog conductor.

2. In some cases 33kV line shall be constructed on suspension insulators on 13 m.

STP (SP-72) using ACSR Panther conductor for which cross arms of M.S. channel

125x65 mm shall be used.

3. However every road crossing shall essentially be done on 13 mt. long STP (SP-72)

poles in case the line is constructed on 11 m ST poles & on 11m STP in case the

line is constructed on PCC pole

11kV:

11kV line shall normally be constructed on 11 mtr. long steel poles (410- SP-55) or

9/8.5 mtr. long PCC pole

2. Stay Sets

1. Adequate number of stays shall have to be provided on the angle support, section

and terminal supports to balance the sideward pull.

2. For that stay sets or strut stays as suitable shall have to be provided by the

contractor as per standard norms of respective DISCOM.

3. The stay sets shall comprise GI stay rod, GI anchor plate, stay wire, turn buckles,

break insulators and stay clamps.

4. Stay of size 20x1800 mm with 7/4.0 mm GSS stay wire shall be used in 33 KV

lines supports wherever required.

5. Stay of size 16x1800 mm with 7/3.15 mm GSS stay wire shall be used in 11 KV

lines supports wherever required.

6. G.S.S. wires shall comply for solid wire (as per I.S.)

3. G.S.S Wires

1. The wire shall be drawn from mild steel rods. The general requirement relating to

G.I. wire shall be laid down in latest version.

2. The size of G.I. Wire shall be 5 mm and 3.15 mm with tolerance of ±2.5% and

tensile strength of 32-55 kgf/mm2. The wires shall be galvanized with heavy

coating as per IS: 4826.

3. The wire shall be circular and free from side irregularities, imperfection, flaws,

splits and other detects. The zinc coating shall conform to heavy coating as laid

down in latest version of IS: 4826 and shall be smooth, even and bright.

4. The stranded wire shall be of grade. „A‟ having minimum tensile strength of 70 Kgf/

mm2. The specific technical particulars of G.S.S. wire arc:

4. Stay Rod

G.I. stay rod of size 1800 x 20 mm with stay wire 7/4 mm should be provided on 33

KV line supports whereas GI stay rod at size 1800 x 16 mm with stay wire 7/3.15

mm should be provided on 11 KV/LT. line supports. All G.I material should conform

to IS: 226 with latest amendments.

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Sl. No.

Particular Detail

For installation of a stay, excavation of hole site should be so selected that the

distance of hole from support should be such that when the stay is set, it should

have the correct inclination. After digging the hole, stay rod should be placed in

position and concreting in the bottom should be carried out. The size of the

concreting is kept as 600 x 600 mm and height 300 mm. The cement concreting

should be done in the ratio of 1:4:8.

The ramming of this earth must be well done thereafter. In setting stay rod, the

whole threaded portion of the plus 12 cm should produce through the ground.

5. Turn Buckle

1. Turn buckle with eye bolts for 33 KV /11KV line conforming to the following.

2. One no of turn buckle made out of 22 mm dia G.I. rod and 75 x 75 x6 mm M.S

angle.

3. One eye bolt made of 22 mm dia G.I. rod with 40 mm inner dia. eye to eye

threaded upto 300 mm length from the other side.

4. Two nos. GI nuts suitable for the threaded portion of eye bolt material

specification IS-226/77 (tested quality).

6. Conductor

1. Prescribed size of conductor shall be used to construct 3 phase 3 wire 33 kV

lines. in case of 33kV line, are generally ACSR Dog and Panther.

2. Prescribed size of conductor shall be used to construct 3 phase 3 wire 11 kV

lines. In case of 11kV, ACSR Dog/Raccoon conductor are used for main lines and

ACSR Weasel/Rabbit conductor for the tapping lines meant for feeding the DT

substations.

7. Cross Arms for

various conductors

1. The steel V-type cross arm of MS channel 100x50x6 mm shall be used for 33 KV

line on Dog conductor and 11 KV line on Raccoon & Dog Conductor.

2. In case of 11 KV line on Weasel & Rabbit Conductor MS angle of 65x65x6 mm

shall be used to fabricate the cross arms.

3. The center-to-center hole for 33 KV & 11 KV cross arms shall be 1525 mm and

1070 mm respectively.

Steel channel / Angle capable of bearing worst loadings

Single Pole: Double Pole:

Weasel, Rabbit

11 KV LINES AND

11kV & L.T.

COMPOSIT MAINS

65x65x6 mm M.S.

Angle Iron (5.8Kg/M)

V- type cross arm,

100x50X6mm, MS.

channel (7.9Kg/M)

cross arm,

Raccoon, Dog

11 KV LINES AND

11kV & L.T.

COMPOSIT MAINS

100x50x6 mm, M.S.

channel (7.9 Kg/M)

V- type cross

arm

125x65mm, M.S.

channel (10.7 Kg/M)

Cross arm

Raccoon, Dog

33KV LINES

100x50x6 mm M.S.

channel (7.9Kg/M)

33KV V-type cross

arm, as per

125x65mm, M.S.

channel (10.7Kg/M)

cross arm

Panther

33KV LINES

125x65 mm M.s.

channel (10.7xKg/M)

Section:

150x75 mm. M.S. channel (14.4

Page | 24

Sl. No.

Particular Detail

33 KV V- type cross

arm,

Kg/M) cross arm

Terminal :

150x75 mm, M.S. Channel (14.4Kg/M)

cross arm

8. Accessories

Every new support shall be provided with pole nameplate, danger plate and barbed

wire wrapped at prescribed height up to 900 mm length (Anti climbing device) in

accordance with the respective DISCOM drawings.

9. D.P. Structure

1. The D.P structure material should be after complete fabrication including drilling of

holes etc.

2. All the horizontal members of the D.P. structure material should be mounded with

suitable clamps and nut bolts with the required clearance as IE. Rule 1956.

3. D.P. Structures material also comprises of- (a)

(i) 3KV line Double Pole: Top channel of size 125x65X6 mm (10.7kg/ Meter)

having length of 3200 mm.

(ii) 11KV line Double Pole: Top channel of size 100x 50X6 mm (7.9 kg/ Meter)

having length 2240 mm. (b)

(i) 33KV Line Double Pole: Bracing two number of M.S. Angle 65x65x6mm to

be fixed by 16 mm dia bolt with suitable washer as per enclosed drawing.

(ii) 11KV Line Double Pole: Bracing two number of M.S. Angle Iron 65x65x6

mm to be fixed by 16 mm bolt with suitable washer as per enclosed drawing.

10. Insulators

1. Both in case of 33kV and 11kV lines;

Pin insulators of appropriate strength shall be used in case of regular pole.

2. Combination of Disc and Pin insulator shall be used, in case of section support.

3. Shackle insulator shall be used in case of LT lines.

11. Pins 33kV and 11kV G.I. Pins

12. F bracket

i) For 33KV supports: Made of M.S. Flat of size 60 x 6 mm should be provided as per

drawing.

ii) For 11KV supports: Made of M.S. Flat of size 50x4 mm should be provided as per

drawing.

13. Danger Boards

1. The danger Board shall be provided as per SMC material.

Drawing of Danger Board of 33 KV line shall be as of 11 KV line Danger Board

except displaying 33,000 volts in place of 11000 volts.

The thickness of plate for danger Boards shall be of 2 mm (14SWG). The danger

boards shall be as per IS: 2551 and duly enameled and fixed with proper clamping

arrangement.

2. The letter figures and the conventional skull and bones of danger boards shall

conform to IS: 2551 and shall be in a signal red on the front of the board.

3. The corners of the danger board shall be rounded off to remove sharp edges.

14. Anti-climbing Devices

GI Barbed wire (Anti-climbing device) shall be provided and installed by the

Contractor on all poles as per drawing enclosed as Annexure - 5, 6, 7 & 8. The

barbed wire shall conform to IS- 278 (Grade A1). The barbed wires shall be given

chromating dip as per procedure laid down in IS: 1340. The Barbed Wires should

be wrapped on the poles at the specified height shown in the drawing upto length of

Page | 25

Sl. No.

Particular Detail

900 mm.

15. Quantities

1. The provisional quantities of required poles, concrete, excavation volume for

foundation and other items are given in Technical Specification/Price schedule.

However the work shall be executed as per approved construction drawings.

2. Cement Concreting: Cement Concrete in the ratio 1:4:8 by volume (1 parts of the

cement, 4 part of the sand and 8 parts of the concrete) is to be used for concreting

of poles & muffing - property curved.

3. The quantities of earth wire accessories indicated in BOQ are tentative and actual

quantity will depend upon final survey (check survey). Payment for contractor

supplied line materials shall be made for the quantities incorporated in the works.

4. Permitted Extra Consumption of Contractor Supplied Material: The Contractor

shall not be required to return to the respective DISCOM cable conductor drums

and shall dispose of the same at his hand.

5. All those materials required for construction & erection of the lines, whose prices

have not been asked to be quoted separately in the price schedule but have been

included with the various work activities in the price schedule, shall be

arranged/supplied by the contractor as per the technical specifications annexed

with the tender. The contractor shall take care to include their cost in the relevant

columns of the work activities, as no separate payment shall be allowed on this

head.

6. The cost of GI /GSS wires and conductor required in bulk for stringing, sagging &

guarding of lines is not to be included in the activity of stringing, sagging &

guarding. The same shall be paid as per prices quoted separately in the price

schedule.

7. However the cost of GI/GSS wire required in other activities like earthing and

stays are to be included in the corresponding activities of the price schedule itself

and no separate payment shall be allowed on this head.

8. All the materials like steel sections, masonry material i.e. Cement, Sand, Coarse

Sand etc. and paints are to be arranged by the contractor and no separate

payment shall be made for these items.

9. The unit rates quoted shall include minor details which may not have been

included in these documents but are executed for satisfactory completion of the

various works.

10. All measurements for payment shall be in S.L units. Lengths shall be measured in

meters corrected to two decimal places. Areas shall be computed in square meters

& volume in cubic meters rounded off to two decimals.

11. Any other material required to complete the work/job shall be paid by respective

DISCOM

Page | 26

ERECTION & COMMISSIONING NEW 11/0.433 KV DISTRIBUTION TRANSFORMER S/S

Sl. No.

Particular Detail

1. Scope

In each town, there are number of new distribution transformers (11/0.4KV) sub-

stations required to be constructed (25/63/100/250/400 KVA). The scope includes

design, engineering, fabrication of the structure and placing of new Distribution

Transformer and its accessories on it. This shall include supply and erection of the

following items: -

1. All the equipments under scope shall be as per their respective technical

specification enclosed.

2. The main items which are to be supplied, erected and commissioned are listed

below: -

- 11 KV/0.4 KV Distribution Transformers of various capacities. (with oil) having

efficiency equivalent/better than that for three Star ratings of BEE with completely

self protective (CSP) features and guaranteed period of five years.

- 11 KV TPMO- Horizontal type

- 11 KV Drop Out fuses.

- 11 KV LA set

- LT Distribution Box, MCCBs, neutral link etc.

- LT CT Metering Cubicle

- Pipe in Pipe earthing

- Cable lugs

- 11 KV jointing kit.

- 11 KV 3 core 70mm sq XLPE cable or construction of 11 KV overhead lines.

- Plinth/'H' structure for transformers mounting.

- LT cables (3.5 core) 240 & 400 Sq. mm XLPE

- LT XLPE cable single core 50,70,240,400,630,1000 Sq. mm.

- Capacitor bank.

- Heavy duty SFU for capacitor bank.

- FRP fencing

- 11 Meter long STP.

- ACSR Dog conductor.

- GI/ GSS Wire & other items associated with construction of overhead line.

1.1 Double Pole

3. Supply erection, testing and commissioning of double pole structures at DT

substation site for fixing of LA, TPMO- Horizontal type, DO Fuse set etc.

1.2 Mounting

4. Contractor shall evolve the mounting arrangements of various equipments on DT

and shall have to get the approval of the Engineer in-charge for its detailed

engineering.

1.3 Oil Test

5. Contractor shall carry out BDV and DGA of the oil and submit the results to the

owner.

1.4 TMPO

6. TPMO shall be Horizontal type. The height of the operating handle shall be such

that a normal height operator can operate it by standing at ground level.

1.5 DO Fuse Set

7. Drop out fuse on 11KV side give protection to the DT even during dead short

circuit condition at 11 KV side.

1.6 11kV LA

8. 11KV LAs shall be pole mounted and its neutral points be earthed through G.I.

strip to the pipe in pipe earthing of DT body, LT distribution board, fencing etc.

Page | 27

Sl. No.

Particular Detail

1.7 LT Metering

9. Suitable LT CT metering cubicle (as per technical spec. with

proper rating of CTs) shall be mounted on double pole for metering of all DTs.

Contractor shall be responsible for installation of DLMS type meter and Modem

(with SIM) in LT CT Metering cubicle etc., complete in all respect. The Meters shall

be compatible with the existing meters and system. (Supply of meter, AMR

Modem, metering cubicle & CTs etc.shall be in the scope of contractor).

(i) Conventional LT CT upto 250 KVA

(ii) Butterfly type CT for 400 KVA and above.

1.8 LT Capacitor Bank

10. The contractor shall supply and erect pole mounted LT capacitor bank of proper

ratings. The capacitor bank shall be connected at the incoming side of the LT

distribution box through a heavy-duty switch fuse unit. The SFU shall be mounted

on double pole also or as directed by the Engineer in-charge.

The capacitor on LT side shall be 10% of the capacity of transformer and 50% KVR

capacity of 10% will be installed on DT pole and 25% at 1/3 length of LT line &

remaining 25% at 2/3rd length of LT.

1.9 Termination Kit

11. All the LT cable shall be properly lugged at both the ends. For HT cable, the

contractor shall supply 11KV heat shrink type termination Kits of standard make.

1.10 Fencing

12. FRP fencing of DT area as per drawing including its distribution board so that

unauthorized accessing can be curtailed.

1.11 LT Distribution Box

13. A suitable lockable LT distribution box (Kit Kat Rewirable Type) shall either be

placed inside the transformer sub-station fencing or between the double pole

structures on steel structure fabricated from 75 x 75 x6 mm size M.S. angle firmly

grouted in the ground with the help nut & bolts.

This distribution box shall have TPN bus bar of 500 or 800 amps capacity. The

single core cables emanating from Distribution Transformer‟s LT side shall be

connected to bus bars and outgoing feeders shall be taken out by Single Core LT

XLPE insulated cable through Kit Kat Rewireable type fuse units. The size of bus

bar and nos. of outgoing feeders shall depend on capacity of transformer.

For 400 & 250 KVA Transformers, bus bar of 800 amps shall be used and no. of

outgoing feeder per distribution box shall be three with 300 amps fuse unit on each

outgoing feeder.

For 160 & 100 KVA Transformers, bus bar of 500 amps shall be used and no. of

outgoing feeders shall be two with 200 amps fuse unit on each outgoing feeder.

For 63 KVA Transformers, bus bar of 300 amps shall be used and no. of outgoing

feeders shall be two with 100 amps fuse unit on each outgoing feeder.

For 1000 & 630 KVA Transformers two LT distribution boxes of 800 amps shall be

placed.

1.12 Earthing 14. Chemical Pipe earthing three numbers, one for transformer neutral and second for

neutral of lightening arrester and third for transformer body, LT distribution board,

fencing of distribution transformer sub-station etc. shall be done.

1.13 Commissioning

15. Contractor shall be responsible for carrying out commissioning of the DT and

coordinating the protection right from 11 KV level to 0.4 KV level.

The contractor will have to construct the DTs sub-station in complete respect and

Page | 28

Sl. No.

Particular Detail

hand over the same to the owner in ready to use condition.

If any item or items not mentioned in BOQ but required essentially for completion

of work, the same shall be arranged by the contractor without any extra payment.

1.14 Stay Sets

Adequate number of stay shall have to be provided on the pole, double pole four

pole structures to balance the side wards pulls at the point of turning of the lines.

All stays had to be grouted as per drawing enclosed. Stay sets shall be as per

specification and drawing.

1.15 Painting

Poles and steel structures shall be properly painted as per UPPCL norm with the

consultation of CEO.

1.16

Fabrication And

Erection Of L.T. Cable

Stand

This work involves fabrication of M.S Angle 50 x 50 x 6 mm. with cable binding /

clamping arrangement including its grouting and painting.

1.17 Laying Of L.T. Cable

Laying of L.T. Cable shall be as per table given below: -

Capacity of For I/C of T/F For Distributors

T/F in KVA Single lead (Sq. mm.) L.T. 3½x cable

(Sq. mm.)

Phase Neutral

25 4x35 4x35

63 3.5x70 70/2

100 3.5x 120 70/2

160 3.5x240 120/2

250, 300 400 400 120/3

400, 500 400/2 400 240/3

630, 700, 750 630/2 630 240/5

800, 1000 1000/2 1000 240/8

All the incoming leads from Transformers to the LT panel are to be replaced.

1.18 Construction of

transformer plinth

The work involves construction of transformer plinth as per drawings suitable for

installation of transformer upto 1000 KVA. The size of plinth shall be 2 to 4 M long, 2M

wide and the height of the plinth shall be 1.2M with 15 Cm. thick top slabs with 2 no.

25x65x6 mm MS channel 2M long imbedded in it.

The above work includes excavation of earth, laying of brick ballast pad for foundation

brick work, RCC and plastering and proper curing. The ration of cement/course

sand/fine sand/brick ballast/stone grit shall be as per PWD schedule.

1.19 FRP Fencing

The fencing is constructed utilizing vertical post duly grouted / fitted in ground/on floor.

Horizontal rails fitted to the vertical posts, pickets (if required) fitted to rails and gate to

facilitate entry and exit within the covered area.

The vertical post shall be made out of FRP Pultruded hollow section. Such posts shall

be kept preferably at a distance of 1000 mm c/c and shall be grouted in the ground

with c.c. of ratio 1:4:8. The vertical posts shall be supplied with pre-drilled holes so as

to accept rails and other accessories for fixing of gates etc. The length of vertical post

shall be sufficient to take care of grouting, depth i.e. underground and height of

fencing above the ground. Posts at corners and gate openings may be of different

size/shape so as to take care of the fencing requirements.

1.20 Chemical Pipe

earthing

The hollow pipe used in the chemical pipe earthing is fitted with a G.I. strip 40x6mm and

CCM (Crystalline conducive mixture) is compressed in to the pipe and pipe is sealed at

both the end. CCM is a semi metal and the hollow pipe filled with CCM behave like a

salt pipe and therefore the current carrying capacity increases substantially.

The CCM has a high melting temperature of 2500°c and unlike coal it will not burn into

ashes under high temperatures of 1500°c under high fault currents occurring due to

phase to phase or phase to earth fault

1.21 L.T. Capacitor Bank The capacitor on LT side shall be 10 % of the capacity of the transformer and 50 %

KVAR (of 10 %) capacity will be installed on DT, 25 % KVAR (of 10 %) capacity will be

Page | 29

Sl. No.

Particular Detail

installed on 1/3rd

of length of LT line and remaining 25 % KVAR (of 10 %) capacity will

be installed on another 1/3rd

of length of LT line.

The contractor shall supply and erect pole mounted LT capacitor bank of proper

ratings. The capacitor bank shall be connected at the incoming side of the LT

distribution box through a heavy-duty switch fuse unit. The SFU shall be mounted on

double pole also or as directed by the Engineer incharge.

The L.T. capacitor bank of required rating shall be placed on one of the pole of the

double pole structure. It is, therefore, essential that contractor should provide

arrangement for hanging the capacitor bank firmly on the pole from the back of

capacitor bank housing using two clamps of proper size or with any other better

arrangement. The contractor shall have to supply, erect, test and commission the

capacitor bank to the satisfaction of respective DISCOM., D.Ts capacity wise

requirement of capacitor bank shall be as follows :- Sl. No. Capacity of DTs. Capacity of capacitor

in KVA bank in KVAR

1. 25 2+1+1

2. 63 4+2+2

3. 100 5+2+2+1

4. 250 12+4+4+3+2

5. 400 20+5+5+5+5

6. 630 30+10+10+8+5

7. 1000 50+20+10+10+10

RENOVATION & MODERNIZATION WORKS & AUGMENTATION OF 11/0.433

KV DISTRIBUTION TRANSFORMER S/S

Sl. No.

Particular Detail

1. Scope

In the town under the scope of this tender, there are number of existing distribution

transformer Sub Stations (11/0.4 KV) with ratings varying from 25 KVA to 1000 KVA

scattered all over the town. Lot of its components are either missing or have become

faulty over the years. The scope of the contractor shall be to carry out reconditioning

of existing Distribution Transformers and renovation and modernization (R & M) work

of all DTs Sub Station of 25 KVA and above ratings including supply of spares,

erection, testing and commissioning. In addition to this metering system on DT sub

stations (where metering system is not installed) are also required to be installed. (LT

TVM, LT CTs & Cubicles either to be mounted on double pole structure or to be

placed in the LT distribution box without TVM cubicle). All the old Distribution

Transformers shall be made completely self protective. For self protection the

Microprocessor based MCCB shall be mounted outside the transformer tank in a

closed box and it is essentially required to meet the compatibility with Overloading

conditions of the transformer. The Internal Circuit Breaker or Microprocessor based

MCCB must meet the overloading condition of transformer as per IS 6600. The

reconditioned transformers shall be guaranteed for three years from the date of

commission.

i) All the equipments under scope of supply shall be governed by their respective

technical specification enclosed.

ii) The main equipments which are to be supplied, erected and commissioned under

R & M work are listed below: -

- 11 KV TPMO –

- 11 KV Drop Out fuse set

- 11 KV LA set

- LT distribution box, MCCBs, neutral link etc.

- Topping up of transformer oil after arresting oil leakages including maintenance of

Page | 30

Sl. No.

Particular Detail

DTs.

- Pipe type earthing.

- Cable lugs

- Plinth for transformers.

- LT cables (3.5 core) 240 & 400 Sq. mm XLPE

- LT XLPE cable single core 50, 70, 240, 400, 630, 1000 Sq. mm.

- Heavy duty SFU for capacitor bank.

- Capacitor bank (LT).

- Fencing of sub stations

- Painting of transformer and structure.

- Replacement of faulty insulator and bushing, if any.

- Supply of new DTs in case of increasing capacity.

1.1 Transformer Oil vi) Contractor shall be responsible for arresting oil leakages and topping up the

transformer oil (fresh) up to the required level.

1.2 Repair of DT

vii) During the course of work, if any internal fault develops in the running DT, the

contractor shall either repair the same at site or shall transport them to the

workshop and repair it. Its handling and supply of spares etc shall be to

contractor's account.

Contractor will ensure continuity of supply with the help of trolley mounted DT

1.3 Oil Leakage viii) Contractor shall ensure cleaning of the oil slippages which had taken place during

oil leakage arresting.

1.4 TPMO ix) TPMO shall be gang operated and height of the operating handle shall be such

that a normal height operator can operate it by standing at ground level.

1.5 DO Fuse Set x) Drop out fuse on 11 KV side shall give protection to the DT even during dead

short circuit conditions at 11 KV side.

1.6 11kV LA xi) 11KV LAs shall be pole mounted and its neutral points be earthed through G.I.

strip to the pipe in pipe earthing of DT body, LT distribution board, fencing etc.

1.7 L.T. Distribution Box

xii) A suitable lockable LT distribution box (Kit Kat Rewirable Type) shall either be

placed inside the transformer sub-station fencing or between the double pole

structures on steel structure fabricated from 75 x 75 x6 mm size M.S. angle firmly

grouted in the ground with the help nut & bolts.

This distribution box shall have TPN bus bar of 500 or 800 amps capacity. The

single core cables emanating from Distribution Transformer‟s LT side shall be

connected to bus bars and outgoing feeders shall be taken out by Single Core LT

XLPE insulated cable through Kit Kat Rewireable type fuse units. The size of bus

bar and nos. of outgoing feeders shall depend on capacity of transformer.

For 400 & 250 KVA Transformers, bus bar of 800 amps shall be used and no. of

outgoing feeder per distribution box shall be three with 300 amps fuse unit on each

outgoing feeder.

For 160 & 100 KVA Transformers, bus bar of 500 amps shall be used and no. of

outgoing feeders shall be two with 200 amps fuse unit on each outgoing feeder.

For 63 KVA Transformers, bus bar of 300 amps shall be used and no. of outgoing

feeders shall be two with 100 amps fuse unit on each outgoing feeder.

For 1000 & 630 KVA Transformers two LT distribution boxes of 800 amps shall be

placed.

1.8 L T Metering xiii) If requird suitable LT CT Metering cubicle (as per technical spec. with proper

rating of CTs) shall be mounted on double pole for metering of all DTs. Contractor

shall be responsible for installation of LT TVM in LT CT Metering cubicle.

Page | 31

Sl. No.

Particular Detail

1.9 LT Cables

xiv) Single core and 3.5 core LT cables if found damaged shall be accessed and

replaced by the contractor. For carrying out this activity, all man, material and T&

P shall be arranged by the contractor.

2.0 Plinth

xv) Contractor shall carry out modifications, repair (in case necessary) in the plinth if

the DT is plinth mounted or the bolting arrangement of the transformer body with

the support structure, in case DT is pole mounted.

2.1 Fencing xvii) Fencing of DT area with FRP fencing as detailed above (wherever possible)

including its distribution box so that unauthorized accessing can be curtailed.

2.2 Bush/Insulators xviii) Contractor shall be responsible for assessing the damaged bushing/insulators in

DT area and shall also be responsible for their supply and replacement.

2.3 MCCB

xix) Microprocessor based MCCB of suitable rating shall be supplied and erected by

the contractor. The Microprocessor based MCCB shall be installed at

transformer's LT side. Output of this Microprocessor based MCCB shall terminate

on LT buses of LT distribution box and after buses.

2.4 Protection Trip setting xx) Contractor shall be responsible for coordinating the protection trip settings right

from 11KV level to 0.4 KV level (at DT output).

2.5 Painting xxi) Contractor shall be responsible for painting the DT including HT and LT

structures. The old paint or rust shall be cleaned first and thereafter two coats of

primer shall be applied and finally two coats of synthetic enamel shall be applied.

2.6 Silica Gel xxii) Contractor shall be responsible to replace the silica gel and filling them with new

silica gel.

GENERAL SPECIFICATION FOR LAYING OF AERIAL BUNCHED CABLES

Sl.

No. Particular Detail

1.

Aerial Bunched

Cables on New

Supports

Aerial Bunched Cable shall be laid over-head with bare messenger wire duly suspended with the help of special clamps and hooks as per drawing enclosed. The clamps shall be supported on LT Poles. The maximum Sag various spans shall be as follows:

Span Sag

60 M 1.409 M

50 M 1.025 M

40 M 0.702 M

30 M 0.423 M

20 M 0.222 M

Typical arrangements of hanging from the support are shown in drawing for “Straight run” “angled” and “dead end” locations. The clamps assembly shall provide sufficient flexibility to allow free movements of the clamps at straight run or angled location.

The tapping arrangements shall be as shown in drawing. The tapping cable shall be connected to the main cable with the help of L.T. insulation piercing connectors (non-tensile). The other end of the taped cable shall be properly connected with the bus bars of the LT Distribution boxes.

New Supports of PCC or Steel Tubular Poles shall be provided as per BID PROPOSL SHEET and Specification. The scope covers erection, grouting and plinthing of poles including adequate no. of stays with its nuzzling and grouting.

The pole earthing shall be done through 20 mm dia 2500 mm long earthing rod and 6 SWG G.I. wire.

Page | 32

Sl.

No. Particular Detail

2.

Aerial Bunched

Cables on

existing LT Lines

The replacement of the L.T. bare lines by Aerial bunched conductors are to be done in selected area of the town which are congested/densely populated and have lesser clearances between lines and the houses and are prone to theft of electricity. The work may also to be done in other selected area of the town as per the decision of engineer in-charge.

LT line shall be replaced as per load by proper size of ABC. Load on LT line shall be measured before replacement by ABC. If required no. of LT circuit on ABC shall be increased. Initially load on replaced ABC shall not be kept more than 70% of its continuous current carrying capacity in air at ambient temp. 400 C. The Continuous Current Carrying capacity in air at ambient temp. 400 C of various sizes of ABC to be used are as below:

Sl.

No. Size of ABC

Current Rating:

Continuous

Current Carrying

capacity in air at

ambient temp. 400

C (Amp.)

Approx. weight of ABC

(Kg./Km.)

1 3x150+1x120+1x16 230 1909

2 3x120 +1x95 +1x16

Sq.mm. 180 1430

3 3x95 +1x70 +1x16 Sq.mm. 155 1180

4 3x70+1x50+1x16 130 890

5 3x50 +1x35 +1x16 Sq.mm. 105 640

3. De-energizing of

system

De-energizing of L.T. system or 11 KV of the site as decided by Engineer in charge before

taking up the work. It shall be the sole responsibility of the contractor to ensure that the line

is de-energized and safe in all respect before start of the work.

4.

Dismantling of

existing L.T. bare

conductors

Dismantling of existing L.T. bare conductors, old or damaged LT cable/11 KV XLPE cable,

consumer service lines, and other fixtures e.g. insulators, clamps, nuts & bolts etc. its

stacking and safe transportation to the respective DISCOM Stores as per the direction of

the Engineer in charge.

5. Stringing and

Sagging of ABC

Erection, stringing and sagging and commissioning of Aerial Bunched Conductors on

existing L.T. poles including fixing of necessary hardware/fittings like suspension Clamp,

Suspension hooks, Poles clamps, Dead end Clamps, Dead end hooks etc. However, it

shall be the responsibility of the Contractor to supply and erect L.T. Poles where required

and instructed by Engineer in charge of respective DISCOM.

6.

Installation of L.T.

insulated piercing

connectors

Installation of suitable L.T. insulated piercing connectors and distribution boxes and

reconnects the service line connections on phase and street light conductors through

distribution boxes with the help of the power cable as per guide lines of site Engineer.

7.

Installation of

Distribution Box

and Release

Service

Connection

1. The distribution box (SMC as well as power coated CRCA MS Sheet by deep drawn

method) shall be suitable for mounting/fixing on round poles & rails. Number of such

distribution boxes to be mounted on one pole shall depend on the number of service

connections to be given from the pole and it may be two to three in numbers. 4 nos. 35

mm 2. Aluminium multi strand cable shall be used to connect the incoming bus bars of

the distribution box to the main Aerial Bunched conductor by using suitable L.T.

insulation piercing connectors.

The number of outgoing cable provisions shall be of approximately 10-15 service cable

connections from each distribution box.

2. There shall be proper clamping & tightening arrangements for the outgoing service

cable.

3. The distribution box shall be of such construction that rain water does not enter into it

and there must be proper sealing arrangement of the pillar box cover.

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Sl.

No. Particular Detail

Alternatively at some of the sites the service connection will have to be given directly

through connectors from main phase conductors without installing distribution

box/kiosk. This decision shall be taken by the Site Engineer of respective DISCOM.

4. Installation of L.T. insulation piercing connectors for jumpering wherever required.

5. The connection to street light shall be through ON/OFF switch already existing. In case

it is not provided the same has to the provided by the contractor.

6. Dismantling of existing LT bare conductors consumer service lines, other line fixture

e.g. insulators, clamps, nuts & bolts etc. its stacking and safe transportation to the city

stores as per the decision of the Engineer in-charge.

8.

Supply and

erection of new

poles

The scope covers supply, erection, grouting & plinthing of LT poles at some places

wherever required along with its civil work. This includes erection of adequate number of

stays with its nuzzling and grouting.

9 Earthing of poles The pole earthing shall be done through 20 mm dia 2500 mm long earthing rod and 6 SWG

G.I. wire.

10. Repair of

damaged poles

The damaged and rusted poles which are repairable shall be identified by Engineer In-

charge. The contractor shall repair these poles at site by welding of M.S. Angle 50x50x6

mm 0.70 mm long 4 nos. to strengthen the bottom of rotten poles. The contractor shall

construct adequate size plinth for such poles by concreting in the ratio of 1:3:6 of cement,

sand & brick ballast and curing the same. The contractor shall have to arrange welding set

and other necessary materials including M.S. Angle etc. for this work.

GENERAL SPECIFICATION FOR LAYING OF 11 KV & 33 KV XLPE CABLE

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Particular Detail

1. General:

1. The scope shall cover complete installation of all equipment and accessories

covered under this contract.

2. Installation work pertaining to equipment, cabling etc should be in accordance

with the applicable standards, safety codes etc.

3. Installation shall be carried out strictly in accordance with the approved drawings

Modifications, if any, required to suit site conditions, shall be carried out only with

the prior approval of the Engineer. All such changes shall be incorporated in “As

built” drawings to be furnished by the contractor.

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Sl. No.

Particular Detail

2.

Laying Of 33 KV & 11

KV Cables

1. It is proposed to lay underground XLPE cable(s) conforming to IS: 692 or

1S.7098 (Part-2) and any amendment thereof as per bill of quantity in various

lengths on different routs within the city.

The Engineer shall intimate the actual rout(s) to the contractor within three weeks.

2. The quantity as given in the bill of quantity are approx. and may vary on either

side as per actual requirement at site. Work should be done as per actual

distances along the route of the cable and shall be paid accordingly.

3. The scope of this specification covers loading transportation, unloading of cable

drums, digging of trenches, laying in underground trenches, jointing terminations

back filling of earth and testing & commissioning of sizes mentioned in schedule

of work conforming to relevant ISS/technical particulars enclosed herewith.

4. The following technical particulars for laying of cable shall be followed as per IS:

1255/1983 or latest amendment thereof.

S.

No. Item For 33 kv For 11 kv

1. Depth of trench 1050 mm 900 mm

2. Width of trench 750 mm 500 mm (For

single cable)

3. Size of stone slab 450x600

x50 mm

450x600x50mm

(For 3x185sq mm

or above size

cable)

4. No. of stone slab per meter 1.67 1.67

5. No. fo bricks per meter 9 x 2 9x2 for 3x185

mm2 or above

6. Local sand per meter 0.563 cubic

meter

0.375

cubic meter

7.

D.C voltage to which cable shall withstand

for 5 minutes after completion of

laying/jointing/termination (in kms) between

any conductor and metallic

sheath/screen/armour.

60 KV 18 KV

8. (HDD method)

As per

specification

given in Vol. II

part A

9.

Clearances- The desired minimum

Clearances are as follows.

a) Power cable to power cable

b) Power cable to control cable

c) Power cable to communication cable

d) Power cable to water line

Clearance not

necessary,

however larger

the clearance

better would be

current carrying

capacity.

0.2 meter

0.3 meter

0.3 meter

Clearance not

necessary,

however larger

the clearance

better would be

current carrying

capacity.

0.2 meter

0.3 meter

0.3 meter

Note:-

High voltage test to be conducted by contractor

.

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Particular Detail

3.

Cable Laying

The trenchless technology shall be used with HDPE casing for the portion of the

cable route such as road, railway, nullah crossing and without HDPE casing for

major portion of the cable route. The outer diameter of the HDPE pipe shall be

suitable for insertion in an 8” diameter horizontally drilled bore. The HDPE pipe

shall be of PE 80 grade with pressure rating PN4 conforming to IS 4984/1995 and

shall have wall thickness of 6.20 to 7.10 mm. The HDPE pipes shall be joined by

using Butt welding and a 7/20 G.I wire shall be provided along the entire length of

each pipe duct. The Depth of horizontal drilling shall be between 2 to 3 meters or as required. The

drilling shall be with a Directional drilling unit equipped with automated pipe

handling system and all necessary accessories. Note:-

In case of any damage of material/ equipment of 3rd party, all charges would be

borne by the contractor

4 Cable Trench

1. The trenches for the cable laying shall be done as per standard practice The

trenches shall be dug in such a manner so that soil etc once excavated does not

fall back in the trench.

The cables (a) entry and exit in pipes etc should be according to relevant ISS.

2. When more than one cable shall be laid in the same trench, a horizontal inter axial

spacing for 0.25 to 0.40 meters for 33 KV and 0.15 to 0.25 meter for 11 KV in

order to reduce the effect of mutual heating effect and also to ensure the fault

occurring on one cable shall not damage to other cable.

3. Where two cables are laid in parallel in one trench, the separation - wall shall be

provided by means of laying bricks throughout its length upto the height of top

slab/bricks.

5.

Road and

Railway crossing

1. In case of roads, railway tracks and water pipeline crossing, the cable shall be laid

in the cast iron/hume pipe etc as prescribed in clause 6.3.4 of IS:1255/1983.

2. In case of Railway crossing entire formality, including cost of attaining its

permission shall have to be carried out by the contractor at its own cost. Also for

the purpose of underground Railway crossing cast iron pipe of suitable size (4"

minimum) shall be laid instead of cement hume pipe.

6. Handling of cable

The contractor shall made adequate arrangement (particularly sufficient man

power & equipment) for proper handling of cables and putting the same direct on

rollers and ensure that no twists etc. are made in the cable and cables are not

damaged in any way whatsoever. Contractor shall also ensure that during entire

working at site upto commissioning stage their responsible engineers/supervisor

with trained crew shall be continuously available

7.

Road cutting and

restoration

1. Necessary permissions to lay the cable in ground after cutting the road(s)

(Kuchha). Brick-pitched & Pucca. Crossing bridges railway tracks etc will be

obtained by the contractor over the request from the engineer incharge of the work

and necessary payment/charges of above shall be borne by the contractor.

2. The contractor should take notice of the fact that in case of cutting of roads etc. is

required for laying cable; the contractor shall have to take prior permission from

local authorities of PWD/ Municipalities /Nagar Nigam/Development authorities etc.

or other owner of the road.

3. The road cutting charges payable to such agencies may be substantial and shall

be borne by the contractor. The contractor shall take care of such charges while

quoting his rate for laying of cables as no extra payment shall be made to the

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Particular Detail

contractor on this account. All necessary clearance for such work from the

respective agencies shall be responsibility of the contractor.

8. Warning / notices

While the execution of work is in progress, the contractor shall have to provide

necessary lighting arrangement/signboard/ road stoppers and other precautionary

warnings/notices so that accidents/ damages/losses to the public/manpower/

material etc are avoided.