Specifications for OPGW Peja 3 - Ribarevine(Tower 12)

8/11/2019 Specifications for OPGW Peja 3 - Ribarevine(Tower 12)

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Specifications

Replacing of existing earth wire with the new OPGWin 400 kV Overhead Transmission Line

Peja 3 Ribarevine

(Kosovo part)

March, 2012

Operator Sistemi, Transmisioni dhe Tregu SH.A.

Transmission, System and Market Operator J.S.C.

Operator Sistema, Prenosa i Trzista A.D.


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Table of Contents

Specifications .......................................................................................................................................... 1

1. Plant Description ........................................................................................................................ 4

1.1 Location of the Overhead Lines ................................................................................................. 4

1.2 Route Description ....................................................................................................................... 4

1.3 Line Conditions ........................................................................................................................... 5

1.4 Climatic Conditions ..................................................................................................................... 5

2. Scope of Supply and Services ................................................................................................... 6

2.1 Scope of Works .......................................................................................................................... 6

2.1.1 Provision of OPGW on existing 400 kV Overhead Line Peja 3 - Ribarevine .................... 6

2.1.2 Replacement of Earthwire by OPGW in 400 kV OHL Peja 3 - Ribarevine ........................ 7

2.2

Optical Groundwire ..................................................................................................................... 8

2.2.1

Design ................................................................................................................................ 8

2.2.2 Sag and Tension Requirements ...................................................................................... 11

2.2.3 Tests ................................................................................................................................ 12

2.2.4 Splicing and Joint Boxes .................................................................................................. 14

2.2.5 Spare Parts and Tools ..................................................................................................... 16

2.2.6 Packing, Shipment, Transport ......................................................................................... 16

2.2.7 Clamps and Fittings for OPGW ....................................................................................... 17

2.2.8 Tests of OPGW and Fittings ............................................................................................ 19

2.2.9 Test for OPGW/OPGW and OPGW/OPUG Splicing ....................................................... 21

2.2.10 Stockbridge Dampers ...................................................................................................... 21

2.3

Construction, Stringing, Commissioning .................................................................................. 222.3.1 General ............................................................................................................................ 22

2.3.2 Safety and Supervision .................................................................................................... 22

2.3.3 Site Preparation and Facilities ......................................................................................... 24

2.3.4 Supervision, Erection and Checking of Work on Site ...................................................... 26

2.3.5 Responsibility of Contractor ............................................................................................. 26

2.3.6 Route Clearance .............................................................................................................. 27

2.3.7 OPGW Stringing .............................................................................................................. 28

2.4 Fibre optic link .......................................................................................................................... 36

2.4.1 General ............................................................................................................................ 36

2.4.2 Power Budget Calculations .............................................................................................. 36

2.4.3 Connectors ....................................................................................................................... 36

2.4.4

Optical Main Distribution Frame ...................................................................................... 36

2.5 Final Checking and Testing ...................................................................................................... 37

2.6

Hand-Over Date ....................................................................................................................... 38

PART2:TECHNICALDATASCHEDULES ........................................................................................... 39

Table 1: Technical Data - 400 kV OPGW Earthwire ...................................................................... 40

Table 2: Technical Data - 400 kV OHL Accessories for OPGW .................................................... 42

Table 3: Technical Data - Supporting Documents ......................................................................... 43

Table 4: Technical Data - Dampers ............................................................................................... 44

Table 5: Technical Data - Connection Clamps for OPGW Connection to Tower Steel Structures 44

PART3:PRICESCHEDULES............................................................................................................... 46

1. Price Fixing ............................................................................................................................... 46

1.1

General ..................................................................................................................................... 461.2 Pricing ....................................................................................................................................... 46


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2. Cost of Items Not Specifically Indicated ................................................................................... 49

3.

Handling of Price Schedules .................................................................................................... 49

3.1 Price Schedule "Contract Summary - Definite Works" and "Contract Summary - Optional

Works" ................................................................................................................................................ 493.2 Factory Acceptance Tests ........................................................................................................ 49

4. Signing of Price Schedules ...................................................................................................... 50

PART4:LISTANDPRICESFORRECOMMENDEDSPAREPARTS .................................................... 1

PART5:LISTOFSPECIALTOOLS(WITHCOMMENTSONEXISTING) ............................................. 1

PART6:LISTOFCONTRACTOR'SMANPOWER ................................................................................. 1

1. Project Management .................................................................................................................. 1

2. Work Force ................................................................................................................................. 1

PART7:LISTOFCONTRACTOR'SMACHINERYANDEQUIPMENT .................................................. 1

PART 8: DEVIATIONS FROM TENDER / CONTRACT DOCUMENTS AND ALTERNATIVES

(SPECIFICATIONS) ................................................................................................................................ 1

PART9:LISTOFSUBCONTRACTORS ................................................................................................. 2


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1. Plant Description

1.1 Location of the Overhead Lines

The project area is located in the North Western part of Kosovo and has an altitude of below 1660 m

(from tower no.12(189)) and below 600 m (from tower no.35(166)). Transmission line routes are in a

valley where vegetation is mainly in cultivated plots. It is believed that no agricultural machines or

irrigating systems are used so far which could be disturbed by the line construction.

Material can be transported by ship to the port of Durres in Albania. The road E851 runs from Bar to

Pristine from where materials may be transported to the project area over local roads.

1.2 Route Description

The existing line route goes over a valley with rolling hills as presented in Fig.1. The drawing is based

on Google Earth map and on the mini-project of the 380 kV Kosovo B - Titograd transmission line.

Therefore, the Contractor shall, based on his own route optimization, carry out his own final line

survey on the basis of the proposed line route, taking into account modifications as requested by the

Employer. The Contractor shall provide a topographical layout survey (GPS-based) for the Employer's

approval.

Fig. 1.

For telecom purposes this part of line will be equipped with optical fibre ground wire (OPGW).


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1.3 Line Conditions

Common line conditions are summarized as follows:

a. Climatic conditions: Weather-related loads on towers, conductors, earthwires, insulator setsetc., are the same for the 400 kV line.

b. Insulation:The entire line is considered to be relatively clean though in industrial and major

cities and partly along main traffic routes. There is moderate pollution from industrial and traffic

atmospheric waste. In regions outside these areas, air pollution is small or non-existing. Taking

into account future industrial growth, a specific creepage distance of 20 mm/kV (pollution class

II as per IEC 60815) is specified and included in the schedule of minimum technical

requirements (Part 2, Technical Data Schedules).

c. Corrosion protection:The following measures are applicable:

All structural steel parts shall be protected by hot-dip galvanizing, according to ISO 1461 bya zinc coat of 610 g/m (86 m) for the steel members and 500 g/m (70 m) for bolts, nuts

and washers.

For the OPGW steel wires, no galvanized steel will be accepted; only aluminium-clad steel(ACS) shall be used.

d. Soil conditions:The line will cross over rolling hilly and plain areas with good soil conditions,

generally stiff, with changing water level. Therefore, foundation types specified in chapter 4.6

cover limited foundation types. However, the foundation types shall be established on the basis

of soil investigations carried out by the Contractor.

1.4 Climatic Conditions

Kosovo has a moderate continental climate with hot summers and cold winters.

Air Temperature

During the year, the average monthly temperatures vary between -17 C in January and 24.6 C in

July. The daily temperature difference between average maximum and average minimum varies

between 5 C in winter to 11 C in summer. Extreme ambient shade temperatures recorded in Kosovo

are:

Absolute maximum +40 C Absolute minimum -40 C.

Relative Humidity

The average relative humidity varies between 51 and 90%. During winter, the average relative

humidity is higher than during summer. Absolute maximum of relative humidity in Kosovo is 100%.

Wind

In Kosovo, Eastern and South-eastern winds prevail. Occasionally, these winds blow very strong.

Average wind speed varies between 1.5 and 3.5 m/s. Maximum wind gust speed is 35 m/s occurring

at any temperature but without additional loading due to ice.

Precipitation

Rainfall occurs during the entire year. The average monthly rainfall in Kosovo varies between 40 and

90 mm. More rainfall occurs during late spring and early summer than during the rest of the year.

Isokeraunic Level

The number of thunderstorm days in Kosovo is up to 40 days per year.


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Seismic Conditions

According to the modified Mercalli scale (MCS), the intensity is between 7 and 8 points. All

electromechanical equipment shall be designed to resist earthquake loads resulting from accelerations

specified in the reports of the Seismic Institute for each particular location.

Solar Radiation

The total heat received by a surface is 800 W/m.

2. Scope of Supply and Services

This chapter describes the extent of contract works assigned to various construction activities under

the Contract. The project will be implemented based on a "plant and build design contract" (turn-key

contract) - FIDIC 1999.

The works and services to be performed by the Contractor shall comprise design, manufacture, shop

tests, packing, transport, insurance, any charges incurred up to delivery up to the state border, landing

charges, transport to the site, insurance, site clearing and levelling, infill, fencing, drainage, civil

construction works, erection of equipment, site testing, submission of documentation, commissioning,

defect liability and everything necessary to leave the plant complete and in full working order at the

expiration of the defects liability period in accordance with provisions of the contract.

The Contractor is bound to provide complete works even if the equipment / parts or sections or works

to be done are not specifically mentioned but are required to complete the works to be operational.

The proposed final arrangement and works is given for indication only. The Contractor shall study:

the position of the towers of existing overhead line, layout plans, operational scheme in this part of the system, availability of the shutdown, and prepare the most suitable arrangement.

Before completing the study and as part of the design, the Contractor shall prepare the step-by-step

changeover procedure, indicating in detail the sequence of proposed construction activities. Utmost

consideration shall be given to the duration of shutdowns, which shall be kept to a minimum. The

solution shall be coordinated and agreed with the Employer.

Route and basic design elements in this connection shall be submitted well in advance for approval by

the Project Manager to avoid delays in construction.

The plant and build design contract comprises the sections as described below.

2.1 Scope of Works

2.1.1 Provision of OPGW on existing 400 kV Overhead Line Peja 3 - Ribarevine

For telecommunication purposes, an OPGW shall be provided and installed in the existing 400 kV line,

Peja 3Ribarevine, from Peja 3 Substation until tower no. 12 near to the border with Montenegro.


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2.1.2 Replacement of Earthwire by OPGW in 400 kV OHL Peja 3 - Ribarevine

In order to install the OPGW, one existing earthwire in 400 kV OHL between tower no. 12, near borderwith Montenegro and Peja 3 Substations should be dismantled and replaced by new OPGW.

The Contractor should dismantle the existing 126.1 mm steel earthwire and shall install OPGW 126.1

mm with 48 fibres of G.655 with total length of 28,100 km, from the tension tower no 12 to the gantry

of Peja 3 Substation. Some allowance for slack span to the Peja 3 Substation's shall be included, thus

giving a total OPGW length of about 28,500 km.

Table 1: Existing Earthwire Characteristics and Weather-Related Factors

Unit

Earthwire

Cross section mm 126.1 Diameter mm 14.5 Weight of wire kg/km 842.1 Modulus of elasticity kg/ mm 16,200 Coefficient of linear expansion 1/C 13*E-06Weather-related loading

Ice load for (earthwire & conductors) kg/m 0.18 d

Max. design tension of earthwire kp/ mm 21 Max design tension of conductor kp/ mm 8

The Bidder shall study and propose OPGW type having similar properties providing the same sags,

hence mid-span clearances shall remain the same. The proposed OPGW shall be fully compatible

with contracted OPGW in CGES with characteristics described in Anex B of this document, extracted

from the Agreement for the Installation of the OPGW cable and telecommunication equipment in the

400 kV Interconnection Line SS RibarevineSS Peja 3, up to the border with Montenegro.

An as-built mini-manual is available and will be handed over to the Contractor upon contract award.

The Contractor should, based on this mini manual:

survey the line as per the requirements detailed in this document, Prepare and submit sag and tension calculations for approval before ordering the OPGW,

Dismantle existing earthwire and install OPGW, All other requirements of the specification are applicable for carrying out the works, as built

documents etc.

The OPGW shall be extended up to Peja 3 Substation gantry where the Contractor, upon successful

optical domain time reflection test (OTDR), should connect OPGW to the terminal joint box. OPGW

termination box shall be installed at the base of the substations' gantry structures. A jumper shall be

provided with a slack span of sufficient length to be terminated at the substation entry equipment.

Connection to the substation optical entry point with be realised with OUG cable.


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The OPGW shall be suitable for service in the specific climate with the main characteristics as

specified in the Part 2, Technical Data Schedules.

The Bidder shall enter the main design data and performances of the OPGW in the Technical Data

Schedules. All these data shall be proven by means of calculations and tests as specified.

OPGW Structure

Structure

The OPGW shall be composed of stranded metallic wires over a central fibre optical core or shall

include optical fibre containing stainless steel tubes in one of the inner wire layers of the conductor.

The construction of the OPGW shall be so that the optical fibre shall not be firmly constrained against

other fibres, strength members, moisture barrier compound or any other components in order that the

fibre strain is de-coupled from the strain in other components when the OPGW is under tension.

The Bidder shall fully detail the composition of the optical fibre unit including heat shielding material

and maximum temperature rating of the materials.

Moisture ingress is not permitted into the optical fibre unit, and Bidders are to provide details on how

to achieve this.

Optical Core Design

Individual optical fibres or groups of fibres shall be contained in protective tubes. These tubes shall

form the fibres' secondary protection (the coating being the primary protection). The optical core

design shall be based upon the loose tube principles. This means that the cable design shall provide a

strain margin. The optical core design shall prevent longitudinal fibre transport in the loose tubes. A

water block shall prevent longitudinal water penetration of the optical core and individual tubes. A

metallic screen that shall prevent ingress of water or moisture to the optical tube/core.

The tube shall be made of metal. Elongation of the tube caused by cable elongation shall be in

proportion to such cable elongation. The inside of the tube shall be smooth.In case the steel tubes are with welded seam, no welding debris shall be left inside the tube. Lengths

of tube shall not be welded together; i.e. there must be no transverse welds. If transverse welds are to

be accepted (only in agreement with the Employer) the location of the weld in the tube and its position

in the actually delivered cable should be indicated. The tube shall be free of pinholes.

The tube shall not deform and shall continue to fulfil its function when subjected to the following:

the electrical, thermal and mechanical loads stated in this generic technical requirements, the high-frequency (>1 Hz) and low-frequency (


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Manufacturing

The OPGW shall be of a design and construction so as to ensure long service life with high economy

and low maintenance costs. They shall be suitable in every respect for continuous operation at

nominal parameters as well as in transient operating conditions, under the climatic conditionsprevailing on the site.

All materials used under this contract shall be of the best quality, and workmanship shall be of the

highest class throughout, with the designs and dimensions of all parts such that the stresses to which

the OPGW are subjected shall not distort or damage them under the most severe conditions

encountered during installation and in service.

There shall be no joints or splices in any optical fibre in a reel length of the complete optical cable.

The OPGW Manufacturer shall be ISO 9000 quality assurance system certified and shall prove a

minimum experience in successful supply of similar OPGW of 10 years.

Special attention shall be paid to the OPGW stranding process to ensure the necessary tightness

between different layers in order to avoid slippage or relative movement of strands or cage formation

during stringing.

The ACS wires of the OPGW shall have a conductivity of 20% IACS. The aluminium coating shall be

smooth, clean, of uniform thickness and free from defects.

For the ACS part, no joints are permitted in individual ACS wires after the cladding of the steel wires.

The Contractor shall ensure that the design and construction of the OPGW is such that the tolerances

stated in the specified standards and in these technical requirements will be observed and verified in

the Manufacturer's works.

The particulars and guarantees specified in Part 12, Technical Data Schedules shall be guaranteed

within the tolerances permitted by the relevant standards, these data and conditions being part of the

Contract.

If the guaranteed values are not achieved, the Employer / Employer's Representative may reject the

said part of the goods at the Contractor's expense.

If the electrical resistance per kilometre of OPGW on any drum exceeds the guaranteed resistance setout in Part 12, Technical Data Schedules, the Employer / Employer's Representative may then reject

any drum found faulty in this respect.

Optical Fibres

For 400 kV line the OPGW shall have 48 fibres according to ITU-T G.655 recommendation, with

characteristics as specified in Part 2, Technical Data Schedules.

No joints shall be allowed in any fibre in any drum length.

Discontinuities may only be accepted while from both ends of the cable, at 1550 nm wavelength, the

difference is less than 0.05 dB/km for every fibre in every drum, provided by ODTR proves.

The Bidder shall state the refractive index of the optical fibres at 1550 nm and all basic parameters of

the proposed fibre.

Fibre Coating

The optical fibres shall be coated with a tight outer UV-hardened acryl protective coating having a

nominal diameter of 250 m 10 m.The coating shall be easily mechanically removable over a length of up to 50 mm for the purpose of

cleaning, cleaving and fusion splicing.

Each fibre shall be colour coded to facilitate fibre identification. These coatings shall be coloured and

shall not degrade the optical cladding/core neither mechanically nor optically.

The optical fibre coating material shall not generate H 2gas around the optical fibres that will increase

the optical loss as specified above over the designed life span of the optical fibre. The Bidder shall

supply details of the methods employed to minimize the generation of H2gas.

The Bidder is to provide details of the coating material, dimensions and minimum bending radius ofthe coated fibre. All coatings / colours shall be compatible with fusion splices utilizing the light inject


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detect (LID) method and profile alignment method.

2.2.2 Sag and Tension Requirements

The OPGW shall be strung considering the following maximum tension / stress criteria:

Everyday tension condition:

At the yearly average temperature (10C), with no wind, the every day stress (EDS) shall not exceed

20% of the calculated breaking load / stress or EDS load recommended by the Manufacturer.

The existing 400 kV overhead line has been designed for the following maximum tension in the most

unfavourable conditions (-20C with wind or -5C ice load without wind) that shall be considered while

replacing the existing earthwire by new OPGW.

Table 2 Proposed OPGW Tension Parameters

Voltage

Exiting Earthwire

New OPGW Max Tension

NoteskV Size daN/ mm

Kp/ mm

400 kV existing 126.1 mm 20.6 21.0 as existing E/W

400 kV new New OPGW

126.1 mm

According to Manufacturer's

recommendation

Note:The value of max tension in Kp/ mm are designed one whereas those in daN/ mm are

calculated as equivalent

Maximum load condition:For the maximum load condition, which can be:

maximum design wind, or reduced wind and ice load, or minimum temperature,

The OPGW shall have, within the adopted limit state design method, the following partial safety

factors:

partial safety factor for actions: 1.35 partial material safety factor: 1.85.This is equivalent to a limitation to 40% of the breaking load within the classical global safety factor

method.The OPGW shall be suitable for stringing on spans up to 600 meters in 400 kV and 450 m in 110 kV

overhead lines, with sags coordinated to those of the conductor. The following sag correlation

condition has to be observed:

For the nominal span under every day condition the final OPGW sag shall not exceed 90% of the

phase conductor sag.

The Contractor shall supply data (initial and final) for the OPGW stringing calculated for different line

spans in a chart or tabulated form, sag and tensions for the temperatures between +80 and -20C

with temperature creep correction.

Before starting the delivery of the goods, the Contractor shall submit the detailed OPGW length

calculation for the line, according to the actual sections, spans and differences in levels.

The Bidder is required to state the maximum tension to which the OPGW may be strung without

affecting the optical properties of the fibres and to retain efficient operation of the communication link.The Bidder is to provide details on the handling and installation techniques of the OPGW, in particular,


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the precautions and methods to be taken to prevent damage to the optical fibres. Any special

equipment or techniques required shall also be given, particularly with respect to:

stringing sheave minimum diameter,

anti-twist requirements, bull wheel diameter for stringing tensioner.

2.2.3 Tests

General

Test programmes shall be prepared and submitted to the Employer / Employer's Representative for

approval. Tests dates shall be announced in time to allow the participation of the Employer /

Employer's Representative if requested. A test report has to be submitted to the Employer /

Employer's Representative for approval within two weeks after test performance.

Type Test

Tests shall be performed in accordance with IEC 60794-4 and IEC 60794-1-2. Type tests certificates

may be accepted provided that tested OPGW structure corresponds to the offered one. In addition, the

following tests referring to fibre optic cable shall be performed:

For the optical fibre (before assembly):- Mode field diameter test

- Cladding diameter and non-circularity test

- Core/cladding concentricity error test

- Tensile strength test

- Tensile proof test

- Micro bending sensitivity test

- Torsion test- Flexing test

- Abrasion test

- Blocking test

- Spectral-attenuation cutback test

- Chromatic dispersion test

- Cut-off wavelength test

- Point defects test

- Min./max. temperature test

- Accelerated oxygen aging test

- Temperature-shock test

- Temperature-cycling test

- Temperature dependence of attenuation test

- Fungus resistance test

For the completed fibre optic cable:- Overall diameter measurement

- Optical cable length measurement

- Vibration test

- Bend, low and high temperature test

- Cyclic flexing test

- Impact test

- Compressive loading resistance test

- Tensile loading and bending test

- Spectral-attenuation cutback test- Chromatic dispersion tests


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- Cut-off wavelength test

- Ambient light susceptibility test

- Optical crosstalk test

- Backscatter light test- Salt spray (corrosion) resistance test

- Accelerated oxygen Aging test

- Temperature humidity cycling test

- Snatch test

Stress-strain

One sample of OPGW, not less than 10m long, shall be subject of a stress-strain test complete with

the fittings. The test shall be undertaken in accordance with IEC 61089, Annex B. The measuring

techniques shall be in accordance with IEC 60794-1-1. There shall be no visual change to the OPGW

strands after the test and the fibre strain must be less than 0.05% at 85% of the UTS of the cable.

Tensile Performance

The test shall be undertaken in accordance with the load conditions specified in IEC 61089, Annex B.

The measuring techniques shall be in accordance with IEC 60794-1-2. There shall be no permanent

change in the fibre attenuation at the specified wavelength after the test, while the change in

attenuation during the test shall be less than 0.05 db/km from zero load to 85% of the UTS of the

cable.

Crush and Impact

The tests shall be undertaken in accordance with the recommendations of IEC-60794-4 and IEC

60794-1-2.

The crush test shall be undertaken by applying to the OPGW a 10 kN load for 1 min. via a 100 x 100

mm movable flat plate. There shall be no measurable permanent change in the fibre attenuation at thespecified wavelength, while any temporary change in attenuation shall be less than 0.1 db.

The impact test shall be undertaken by dropping a 4 kg weight from a height of 150 mm onto the end

of a 20 mm diameter steel mandrel placed on the OPGW. After 20 repeated applications, there shall

be no measurable change in fibre attenuation at the specified wavelength, while any temporary

change in attenuation shall be less than 0.1 db.

Temperature Cycling

The optical performance under temperature cycling shall be tested in accordance with IEC 60794-1-2,

with TA and TB as stated in Part 12, Technical Data Schedules and the duration of 4 hours. The test

should be undertaken twice.

Water Ingress

The optical sub-unit shall be tested for water ingress in accordance with IEC 60794-1-2.

Short Circuit Current

One sample of OPGW, not less than 10 m long, shall be subject to a short circuit current pulse. The

short circuit current pulse specified in Part 2, Technical Data Schedules shall be applied within less

than 1 s after the conductor's initial temperature has been raised to the specified value. During the

test, the temperature of the optical sub-unit shall be measured, the temperature immediately after the

current pulse shall be less than the specified temperatures. The test shall be performed three times

with an interval of 30 min. Optical alteration of the test fibres shall be monitored continuously. After the

third impulse, the OPGW shall be dismantled and the optical cable examined throughout its length for

any signs of deterioration.


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Lightning StrikeThe test shall consider both an initial stroke and a power follow through. The test conditions shall be

Class 0 according to IEC 60794-1-2. The test shall be carried out on a sample of OPGW, not less than

2 m long. The acceptance criteria shall be that calculated residual strength OPGW is not less than90% of the original stated ultimate tensile strength. Any damaged strands shall be assumed to be

broken.

Sample Tests

Tests for aluminium-clad steel wires/aluminium alloy wires shall be carried out in accordance with the

requirements of IEC 61232/ IEC 60889.

Samples taken on random from the OPGW drums ready for shipment against each batch shall be

tested for overall diameter, the lay length and lay ratio of layers, lay directions and DC resistance in

accordance with IEC 61089 or EN 50182 at the factory by the manufacturer which may be witnessed

by the Employer / Employer's Representative.

In addition, attenuation shall also be measured on each fibre of above mentioned sample drums of

OPGW with OTDR.

Routine Tests

OPGW on all drums shall be tested for mechanical tests including measurement of overall diameter of

OPGW, measurements of thickness of Al and ACS wires, diameter of tube, wrapping test of Al and

ACS wires, check of surface quality and OPGW weight, checking of lay length and lay ratio of layers,

checking of lay directions, breaking load test of OPGW and DC resistance measurement in

accordance with IEC 61232, IEC 60889, IEC 61089 or EN 50182 at the factory by the Manufacturer as

routine tests.

In addition the following routine tests shall be performed:

Attenuation on each fibre of all OPGW with OTDR at the factory by the Manufacturer as routine

test, Fibre point defects test, Fibre attenuation test, Fibre microbend test, Cut-off wavelength test, Chromatic dispersion test.

Optical Fibres

Optical fibres shall be type tested in accordance with the requirements of ITU-T G655/G652 and IEC

60793, as appropriate. Routine tests regarding attenuation OTDR shall be carried out according toIEC 60793-1 at the factory by the Manufacturer.

2.2.4 Splicing and Joint Boxes

On the substation gantries (connection between OPG and OPUG) and at every 3 to 5 km on tension

towers (connection of OPGW sections) shall be implemented by means of joints in terminal joint or

through joint boxes.

At the tension towers not provided with joint boxes, the Contractor shall provide suitable attachment

fittings to by-pass the tower without any additional joint. The prescribed minimum bending radius shall

be observed at all angle points. If necessary, special tandem or multiple stringing blocks have to be

used for stringing the OPGW at angle points.

The joint through boxes shall be of the "hood" type with encapsulated cable entry. They shall be


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mounted within the framework of the transmission towers above the anti-climbing device. The OPGW

access to the casing should be via entry ports in the base, properly sealed to prevent moisture

ingress. Same joint through may be used as terminal box for jointing OPGW with OPUG in substitution

gantry by applying of appropriate glands in entry ports or a different design used according tomanufacturer recommendation.

The Bidder shall present in his Bid detailed description and drawings of the OPGW / OPGW and

OPGW / OPUG jointing procedure and devices. He is responsible for the operational continuity of the

optical fibre system considering that the interface point between line and underground cable is the

joint casing at the gantry. All documents supplied by the Contractor shall be submitted to the

Employer / Employer's Representative for approval before starting of the Manufacture.

Weatherproof units shall be provided for the joint boxes (casings). The joint boxes shall include all

necessary hardware to terminate, protect and fix the spliced fibres. Optical losses shall be no more

than 0.08 dB on an average per splice, and no single splice loss shall exceed 0.10 dB. Each splice

shall have a spare fibre length of approximately 1 m or more. A finished splice shall be supported

within the joint box by suitable clips or restraints. It shall be possible to remove and replace the splice

in the support device without risk of damage to the splice or fibre.

The inlets of the joint boxes shall be sealed with thermo-shrink plastics. The outer material of the box

shall be oil-resistant and metallic, preferably aluminium. The enclosure is to be re-enterable and re-

sealable without detriment to the integrity of the enclosure and optical fibres. Enclosure re-entering

and sealing shall not require power tools and shall use only a minimum number of special tools.

The Bidder shall provide detailed specifications for mechanical and optical aspects of all joints, splices

and end sealing arrangements for the individual parts and/or complete system. The Bidder shall

submit with his Bid a calculation of the total attenuation (overall losses) for the completetelecommunication link considering all splices, fibre aging, etc. The total alternation shall be a

guaranteed value.

The quality and performance of all joints shall achieve the mechanical requirements over its design

life.

The Bidder shall describe in detail the proposed method of jointing the optical fibre, both during

manufacture and installation.

The Contractor shall provide detailed drawings showing the location of all joints. Each joint shall be

uniquely numbered.

As part of the jointing procedure, the Contractor shall monitor the optical performance of each joint

using an optical time domain reflectmeter. Upon completion of jointing and prior to sealing, the joint

casing an estimate of joint loss and measurement of the total fibre attenuation shall be made. If the

total fibre loss is projected to exceed the designed installation loss, the joint shall be broken and

rejoined until the specified performance is achieved.

If local injection and detection techniques are used to measure the attenuation, any necessary fibre

bends shall not affect the physical properties of the fibre and shall not shorten its life span.

The fusion splice tray shall not have any sharp edges or protrusions that may damage the optical fibre.

Number tags for fibre and tube identification are to be included.


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2.2.5 Spare Parts and Tools

Spare PartsSpare OPGW quantities, as per the Part 3 Price Schedulesshall be delivered together with the last

scheduled dispatch and shall be provided in continuous lengths on non-returnable steel drums as

specified.

The Bidder shall enter the corresponding prices in these price schedules and carry the sub-total to the

Summary.

For any additional quantities that may be ordered after the date of the taking-over certificate, the

prices will be subject to adjustment.

The spare OPGW have to be adequately protected against humidity, corrosion, etc. and packed and

treated in such a manner as to be suitable for storage in the climatic conditions at the site, for an

indefinite period. They shall be delivered on steel drums provided with identification labels including

also type and quantity.

The spare OPGW shall be delivered to the Employer's stores, and delivery will not be deemed

completed until the packing material has been checked by the Employer / Employer's Representative.

The taking-over will take place after delivery to the Employer's store and the taking-over certificate will

be signed by the Employer / Employer's Representative.

The Bidder shall also fill in the list as per Part 14 Recommended Spares for maintaining the fibre optic

link over its expected lifetime. Those spare parts shall not be included in the Summary of Part 13 and

the list shall not be binding. The Employer may purchase all or part of these recommended spares.

Tools

The special tools and test equipment needed to maintain the fibre optic link over its expected lifetime

may be included.

The Bidder shall fill in the list as per Part 5 Recommended Special Tools for maintaining the fibre optic

link over its expected lifetime. Those spare parts shall not be included in the Summary of Part 3 and

the list shall not be binding. The Employer may purchase all or part of these Special Tools.

2.2.6 Packing, Shipment, Transport

The OPGW shall be delivered and shipped on stoutly constructed timber or steel drums as specified,

and lapped with protective covering across the whole width of the drum. The OPGW shall be shipped

in continuous lengths clearly marked by the manufacturer. The packing for the corresponding spare

parts shall comply with the requirements specified for long time storing.

All drums with OPGW shall have a layer of waterproof wax paper or plastic sheet which must be safe

against chemical reactions. It shall be laid around the barrel under the OPGW, another one shall be

laid over them and under the lapping. Drums shall be securely fastened around the perimeter and

shall be suitable for rolling on the flanges without causing damage to the OPGW.

The disposal of all empty drums shall be the responsibility of the Contractor.

The following information shall be clearly written in indelible paint on both flanges of each drum:

contract title and reference number; Manufacturer's name;


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lifting instructions and limitations; direction of rolling.

An aluminium or painted metallic marking plate shall be fixed to each drum clearly showing thefollowing data:

type and size; length; gross and net weight; batch and drum numbers; stranding date; main dimensions of the drum; correct direction of rolling.

The Contractor shall submit a sketch or drawing showing the full details of drum design and the details

of the proposed method of impregnation and lagging of the inner drum surfaces with approved tarred

paper or equivalent material. The minimum length of the OPGW on drums is subject to the

Employer's / Employer's Representative's approval.

2.2.7 Clamps and Fittings for OPGW

2.2.7.1 General

All clamps and fittings shall comply with the requirements of this Biding Document and must be

approved by the Employer / Employer's Representative. They shall be suitable for the OPGW type

proposed by the Contractor. The Contractor shall ensure close and continuous liaison between themanufacturers of OPGW, clamps and fittings so that the equipment will be perfectly adapted. The

detailed design of OPGW suspension and tension hardware shall be coordinated with the

manufacturer of the OPGW. The installation techniques and procedures shall be submitted to the

OPGW manufacturer and his written approval for the complete design and materials intended to be

used with the approved OPGW type will be presented to the Employer / Employer's Representative

before the final approval for the hardware and OPGW will be granted.

All clamps and fittings except for vibration dampers shall be supplied by the same manufacturer.

Splitting up of the supply of clamps and fittings will not be permitted.

Besides, the Contractor shall assure perfect fitting of the OPGW set attachment armatures (connecting

hardware) to the tower steel construction. The design of adjacent metal parts and mating surfaces

shall be such as to prevent corrosion of the contact surfaces and to maintain good electrical contact

under service conditions.

At all suspension, tension towers and substation gantries, the OPGW shall be electrically connected to

the steelwork by means of jumpers of the same size and material as the OPGW as well as by means

of suitable fittings.

The earthwire connections to the towers (connecting hardware, earthing connections) shall withstand

the single-phase fault current shown in Part 2, Technical Data Schedules without suffering damage

and this performance must be checked in accordance with the requirements. The Employer /

Employer's Representative may require tests to be carried out to demonstrate the short circuitcharacteristics of each type of connection-to-tower set. The cost of such tests shall be borne by the


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Contractor.

All ferrous parts of the assemblies component elements and of the accessories for conductors and

OPGW shall be hot dip galvanized according to ISO 1461.

The split pins of all clamps and fittings shall be of stainless steel.

The suspension towers will be equipped with suspension sets and the tension towers with tension

sets. All sets shall be designed for the OPGW selected type and for the mechanical loads and loading

conditions shown below as well as the safety factors given in Part 2, Technical Data Schedules:

OPGW dead weight design spans as specified maximum wind speed maximum ice load

ice load with reduced wind maximum working stress in the OPGW.

Particular care shall be taken during manufacture of clamps and fittings and during subsequent

handling to ensure smooth surfaces free from burrs and sharp edges.

2.2.7.2 Suspension Assemblies

Armour grip suspension clamps shall be used for OPGW. The clamp body shall be of high-tensile

strength corrosion-resistant aluminium alloy and shall preferably be forged or cast. For cast clamp

body, an additional reinforcement shall be foreseen. The spiral rods shall also be of aluminium alloyand shall not have diameters of less than 4 mm.

The material of the clamps should satisfy the norms EN 1559 for aluminium alloy castings and EN

1562 for malleable cast iron.

The neoprene or other non-metallic material shall have good resistance to aging and be capable of

withstanding temperatures between -20C and +40C without changing essential properties. The

material shall have adequate resistance to the effects of ultra-violet radiation, ozone or pollution

factors.

The rotational axis of the clamp shall be in the longitudinal axis of the OPGW to avoid unacceptable

distortion of the OPGW due to unbalanced longitudinal loads. The Contractor shall ensure by

appropriate design a suitable performance of the clamp-conductor assembly by wind induced

vibration.

In addition to the suspension clamp, connecting hardware is required for a suitable mechanical and

electrical connection to the tower. The Contractor is responsible to supply the complete set of the

suspension assembly.

2.2.7.3 Tension Assemblies

OPGW attachments to tower shall be of helical grip type consisting of two helical parts (fittings), one

for OPGW protection and the other one as actual dead-end fitting. Preformed helical dead-ends shallhave "cabled loop" eyes. The material of the spiral rods shall be high-tensile strength aluminium clad


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February 2000).

The tensile test shall be agreed with the OPGW Manufacturer, and the optical attenuation shall be

measured. The clamp bolts have to be tightened according to the recommended moments and theOPGW shall be visually checked afterwards.

The vibration test shall be coordinated with IEC 60794.

The Bidder shall demonstrate the adequacy of the grounding connection to the fault current by test

date, field experience or calculation.

The costs for these tests are deemed to be included in the bid price.

2.2.8.3 Splice Boxes for OPGW

The OPGW fittings and the hardware for OPGW/OPGW and OPGW/OPUG joints used in this contract

shall be subjected to type tests.

The Bidder shall nominate in the Technical Data Schedules the type tests he proposes for the

OPGW/OPGW and OPGW/OPUG joints. Joint box type tests shall include a water immersion test for

proving the joint water tightness and seals, with measurement of attenuation variation of the splice and

loss characteristic in an assembled joint at the start and end of a 7 days immersion period. Type test

certificates may be submitted to the Employer / Employer's Representative for approval.

The costs for these tests are deemed to be included in the Bid Price.

2.2.8.4 Final notes and OPGW fittings thermal stability

In addition to the tests mentioned above, particular tests have to be carried out on the insulator sets

and insulator units:

corona test; radio interference test; thermal stability test (OPGW).

The tests referring to the insulator sets have to be carried out on completely equipped sets, with all

clamp and fitting parts, installed in their characteristic working position and having attached also an

agreed length of conductor or conductor bundle. The costs for these tests are deemed to be included

in the bid price.

Thermal Stability Tests for OPGW fittings

Thermal stability of the OPGW suspension and tension attachments to tower shall be verified

according to the procedures recommended in IEC 61854.

If requested by the Employer / Employer's Representative, a thermal stability tests shall be carried out

as type tests in the Manufacturer's works or in specialized laboratories on the OPGW suspension and

tension attachments to tower.

Each attachment set type shall be completely installed in its typical working position together with a

sufficient OPGW wire length in order to allow for a simultaneous test (OPGW and attachment set).Each set type will be submitted to a cycle of 3 tests with different test parameters as shown below:


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Table 3: Thermal Stability Test Parameters for OPGW Suspension and Tension

Attachments

Short Circuit Current

400 kV Lines

Test Type to be Selected Duration

1 7 1.0 sec.

2 10 0.5 sec.

3 22 0.1 sec.

Oscillograms of the short-circuit currents and voltages applied during tests shall be recorded.

Photographs shall also be taken from the tested object before and after test.

The tests shall be considered as successful if no damage of the earthwire or to the attachment setsoccurs. The fault current supply circuit and the arrangement of the tested object shall be subject of the

Employer's/ Employer's Representative's approval.

2.2.9 Test for OPGW/OPGW and OPGW/OPUG Splicing

After installation of the OPGW/OPUG but before splicing, the optical fibres shall be tested regarding

attenuation. Furthermore, OPGW/OPUG joints shall be tested to prove compliance with the specified

performances (attenuation), including OTDR tests.

2.2.10 Stockbridge Dampers

2.2.10.1 Requirements

Vibration dampers of stockbridge type shall be installed at all OPGW suspension and tension points

and shall be mounted on armour rods. Minimum two dampers per span shall be provided; one damper

per span is not permitted. The exact number of dampers shall be determined by a damping study

which is included in the scope of work. The Contractor shall submit all data and calculations regarding

the characteristics, number and placement of the vibration dampers to be used for the various ranges

of spans. The calculations shall cover the range of 1 to 7 m/s wind velocity, the typical OPGW tensions

(EDS) and the range of span lengths. All calculations shall be performed under the responsibility of the

Contractor and shall be subject to approval by the Employer / Employer's Representative.

Regarding the damping characteristics of the vibration damper, the Contractor shall guarantee that

close to the suspension clamps as well as to the damper own clamp, the conductor stains due to the

wind induced vibrations are kept within acceptable limits over the entire range of possible frequencies.

The Contractor shall guarantee, by means of corresponding calculations, that the bending strain of the

conductor will be restricted to maximum of 150 m/m and the damper clamp velocity will not exceed0.1 m/s.

The damper clamps shall be of forged aluminium alloy or cast and shall be designed to ensure that

dampers do not cause damage to the OPGW for which they are used.

The damper clamp shall be dimensioned to keep the necessary distance between the first vibration

damper and the mouth of the suspension clamp on OPGW, taking into account the installation on the

OPGW or on the armour rods.


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For bolted clamps, the clamping bolts shall be of steel having a minimum tensile strength of 800 N/

mm. They shall be designed to facilitate an easy damper mounting. The screws shall be locked in an

approved manner. The washers shall be made of stainless steel.

Elastomers or other non-metallic materials if used shall have good resistance to aging and shall be

capable of withstanding temperatures between -20C and +40C without change of essential

properties. The materials shall have adequate resistance to the effects of ozone, ultra-violet radiation

and air pollution over the entire temperature range.

The dampers shall be designed to exclude water collection. If this is not possible, they shall have

drainage holes with a minimum diameter of 6 mm.

All ferrous parts of the damper elements shall be corrosion protected.

2.2.10.2 Tests

Stockbridge dampers shall be type and sample tested in accordance with IEC 61897 (Requirements

and Tests for Stockbridge Dampers). The test procedure shall be agreed with the Employer /

Employer's Representative in order to ensure the requirements specified or other approved

requirements. Tests shall not cause damage to the OPGW to which the test dampers were applied.

Tests of sliding forces shall be applied for bolted damper clamps only.

Tests of the electrical and mechanical characteristics of the stockbridge dampers shall be covered in

Part 3, Price Schedules.

2.3 Construction, Stringing, Commissioning

2.3.1 General

The following chapters contain the requirements and conditions for the preparation of access roads,

route clearing, tower pegging, preparation of tower locations, foundation works and erosion protection,

tower erection, conductor and OPGW stringing and sagging works as well as final commissioning.

The Contractor has to develop a suitable planning and has to suitably split the line length into several

sections, which have to be treated separately and simultaneously in order to meet the target

completion date. For each operation, the necessary number of teams shall be determined based on

average productivity.

The Contractor shall have available competent and experienced supervisors on site at all times during

construction / erection works, so that the building quality is achieved as per requirements set out in

these bidding documents.

2.3.2 Safety and Supervision

The Contractor shall prepare a report on safety on site in line with the regulations of the country and

submit it to the Employer for approval.

2.3.2.1 Safety of Personnel


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Methods of carrying out the work and qualification of specialists, irrespective of particular requirements

herein, shall conform to high quality standards. Generally accepted practice requirements and practice

of high-skill work of the mentioned type shall be observed in any respect. The Employer shall be

satisfied with the quality of all works and shall confirm this. However, such confirmation shall notrelieve the Contractor from his responsibilities or obligations.

When carrying-out the works, the maximum safety, consistent with good construction and erection

practice, must be observed by the personnel engaged in this contract.

This refers to the works on preparing ditches for foundations, especially shuttering or and tower

assembly and erection.

If tower lifting method is used the particular care shall be taken that during tower raising the workers

not engaged in the lifting operations are moved to a safe area.

Since construction and erection in some parts of the line will be carried out in the area of existing and

energized high voltage lines, additional measures shall be taken to protect the personnel against

induced voltage. These measures shall apply during installation of conductors and OPGW.

All works on conductors and wire cables stringing in dangerous areas shall be performed strictly

observing "Safety rules for construction and erection works on or nearby operating transmission lines".

Additional safety measures in carrying-out construction and erection works on crossings are as

follows:

1) Road crossings:

the time of beginning, duration and technology of safe works on conductors and wire cablesmounting when crossing a highway shall be agreed on with the organization operating this

highway;

when carrying out the works, the attendance of a representative of this organization ismandatory unless denied in writing is obtained.

in places of traffic, the conductors and wire cables shall be run-out on a scaffolding of atleast of 6.0.m a height.

at the moment of conductor stringing, care shall be taken to keep people away from andunder the conductors and wire cables;

at a distance of 100 m on both sides of the scaffoldings, the mounting crew foreman shallplace workers with red flags to warn or stop the transport if necessary.

places of work shall be marked with "safety first" signs; conductor stringing shall not be performed in fog with low visibility, in icing and wind with a

speed over 10 m/s.

2) Electrified railroad crossings:

to ensure safe works on suspension of conductors and wire cables, temporary towers shallbe installed based on reinforced concrete posts of at least 20 m height with horizontal arms.

These posts shall be buried into the ground to a depth of 3 m. Temporary towers shall be

installed in distance of 15 m from the permanent railroad, 10 kV OHTL or communication line

servicing the railroad. They shall be dismantled, after the works are completed;

to prevent disruption of train schedule, the total time required for mounting of OHTLconductors and wire cables crossing railroads shall be divided into possibly equal periods

during which the works shall be performed in intervals between freight and passenger trains; when performing the works, the railroad contact conductors and 10 kV OHTL conductors


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shall be deenergized;

three days prior to commence the work a request for disconnection of 10 kV OHTL shall befiled to the relevant authorities operating the railroad, and a permission for carrying out the

work shall be obtained. The work shall be carried out only when attended by representativesof the railroad services.

3) Communication line crossings:

safety technology for conductors stringing over aerial communication line crossings withoutline rearrangement shall be agreed upon with the respective authorities operating the

communication line;

stringing of conductors and OPGW over communication line without the line rearrangementshall be performed only with the written permission of the this communication line operator

and in the presence of its representative. In this case scaffolding arrangement, their

dimensions and place of erection shall be agreed with the line operator.

The contractor shall be fully responsible for any damage that may occur due to the line erection

works and shall perform all required repairs to restore the line to its previous technical and

operational status.

4) Operating transmission line crossings:

the Contractor's personnel shall arrange for and attend safety training to get acquainted withsafety regulations being in force in the line operator organization.

The Contractor shall propose site arrangement scaffolding and their dimensions andlocations for the line mechanical protection during stringing operation. The arrangement shall

be approved by the line operator.

The works should not start without permit to work signed by the line operator. prior to commencing stringing operation, all towers under the project within in the stringing

section should be earthed. stringing may commence only upon the existing line de-energisation and suitable grounding

in place. The grounding of existing line shall be performed by the operator's crew

demonstrating the absence of voltage while installing grounding.

the working areas shall be marked with warning signs.

2.3.2.2 Compliance with Rules and Regulations

All equipment and materials supplied and all work carried out shall comply in all respects with the

requirements of the rules and regulations as well as of acts in force in the country of the Employer and

applicable to the contract works.

2.3.2.3 General Particulars and Guarantees

The works shall comply with the general particulars and guarantees stated in contract documents. All

working methods employed and all plant and equipment supplied under this contract shall be

approved by the Employer. The Contractor shall be responsible for any discrepancies, errors or

omissions in the general particulars and guarantees.

2.3.3 Site Preparation and Facilities

The Contractor shall prepare the site to perform his duties in efficient and smooth way. The facilitiesdescribed here do not cover all but only a main features necessary to be provided.


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Part 7 chapter 7 describes requirements for the Employers'/Employer's Representative facilities.

2.3.3.1 Office Accommodation

The Contractor shall provide for himself such buildings as may be necessary for office accommodation

for his site staff during the construction period. The cost of these shall be included in the contract

price.

2.3.3.2 Living Accommodation

The Contractor shall make his own arrangements with regard to accommodation for his expatriate and

locally recruited staff during the construction period. All dwellings and buildings existing or erected for

this purpose by the Contractor shall comply with local regulations with regard to construction, water

supply, sanitation and other requirements.

Temporary construction camps shall be provided with proper sanitation and other necessary facilities.

All accommodation shall be removed by the Contractor when no longer required. After the removal of

accommodation, the ground shall be left in a clean and tidy condition.

2.3.3.3 Medical Services

The Contractor shall make his own arrangements where medical services may be required for his

repatriate and locally engaged staff.

2.3.3.4 Water, Electricity, Drainage Sewage, Fencing, etc.

The Contractor shall provide all ancillary facilities as required to keep site bin sound technical

operational and sanitary conditions

2.3.3.5 Staff Transport

The Contractor shall provide at his own expense all necessary transport for his personnel and

materials.

2.3.3.6 Storage Facilities

The Contractor shall make his own arrangements for storage area and shall obtain the approval of the

Employer for the places along the line route where he intends to store materials. Such places shall not

be outside the authorized area unless special arrangements are made with the owners of adjacent

property. The Contractor shall provide any necessary protection and safeguarding of the materials in

the areas allocated to him. The handling and storage of any equipment at the site shall be at the risk

of the Contractor and without responsibility to the Employer. The Contractor is to arrange the

protection of these materials against vermin attack, corrosion and mechanical damage during storage.

The site storage area shall be prepared with adequate hard standing for the orderly storage of

conductor drums, tower steel, insulators and fittings so that the material will not be damaged by the

effects of adverse weather during storage. Materials and equipment packed in flammable crates or

drums shall be stored in such a manner as to avoid any damage arising from fire.

2.3.3.7 Compressed Air


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The Contractor shall make his own arrangements for a supply of compressed air if required for the

execution of the contract works.

2.3.3.8 Lifting Facilities

The Contractor shall make his own arrangements to purchase or provide lifting facilities required for

materials and equipment handling and transport on the site.

2.3.4 Supervision, Erection and Checking of Work on Site

All works on site included in this contract shall be supervised throughout by a sufficient number of

qualified representatives of the Contractor who have thorough experience of the erection and

commissioning of similar works.

The Contractor shall verify from time to time which portions of the site works the Employer desires to

check, but such checking shall not relieve the Contractor from the liability to complete the works in

accordance with the contract or exonerate him from any of his guarantees.

If the Employer proves that the Contractor will be unable to complete any section of the works in the

stipulated time, the Contractor shall mobilize its staff/personnel to carry out works outside normal

working hours to catch up the scheduled time. For this extra work, the Contractor is not entitled to

claims for any extra expenses unless the delay is due to causes for which the Contractor is entitled to

an extension of time under the conditions of contract.

If the Employer proves defective works, the Contractor shall, after the completion of works, keep on

site supervisory staff of such number and for such periods as the Employer may require to remedy therevealed defects in the shortest possible time.

The Contractor shall keep all the site including office/living accommodation storage, canteen (if any) in

reasonably clean conditions, removing all waste material resulting from the works as it accumulates.

On completion of the construction, the site is to be left clean and tidy to the satisfaction of the

Employer. Any damage done to buildings, structures and plant or property belonging to the Employer

shall be made good by the Contractor at his expense.

2.3.5 Responsibility of Contractor

Until each section of the works has been taken over or deemed to have been taken over under the

conditions of contract, the Contractor shall be entirely responsible for such sections of the works under

construction and during testing.

During the period of maintenance, the Contractor shall ensure that a competent representative is

available at the site for the purpose of carrying out any work of maintenance for which the Contractor

is responsible.

Any work which may be required from the Contractor in pursuance of his obligations under the

conditions of contract shall be carried out so as to interfere as little as practicable with the normal

operation of the energy system. Works on the site shall be carried out at such time and during such

hours as the Employer may require.


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Works shown in the drawings and not mentioned or described in the technical requirements, or works

described in the technical requirements and not shown in the drawings shall nevertheless be deemed

included in the contract, and their fulfilment shall be included in the contract price.

2.3.5.1 Contractor's Employees

The Contractor shall fulfil all his obligations in respect to accommodation, feeding and medical

facilities for all personnel he employs in accordance with the requirements of the statutory labour

regulations of Kosovo. The Contractor shall be responsible for the behaviour on site of all personnel

employed by him.

2.3.5.2 Control of Subcontractors

The Contractor shall be responsible for specifying the quality assurance requirements applicable to

subcontractors and suppliers, for reviewing the implementation of subcontractors' quality assurance

arrangements and for ensuring compliance with the requirements.

The Contractor shall ensure that all appropriate technical information is provided to subcontractors

and suppliers. The Contractor shall, for the supply of items, plant and equipment (including those

subcontracted) arrange for suitable protection for the products at all stages including delivery and

installation on the site.

The Contractor shall submit for information a detailed programme defining the basis of control to be

applied to each subcontract or supply order.

2.3.6 Route Clearance

Wayleave for the line (subject to the negotiations between Employer and authorities / landowners) will

be provided by the Employer to enable the Contractor to carry out the contract works. Before the

Contractor commences work on any property, he will obtain from the Employer the explicit permission

and if applicable a wayleave schedule giving details on any special requirements of the owners

concerned. The Contractor shall give adequate notice of commencement of work to the landowners.

2.3.6.1 Removal of Obstacles

As the danger of bush fires does exist, scrubs and trees (particularly pine trees) have to be cleared

from the line corridor. Where clearing is necessary, the following requirements shall be observed:

Fruit trees and crops shall not be removed at all. The Contractor shall take the necessaryprecautions to avoid damage to these crop trees when carrying out the easement clearing. The

compensation or consequences caused by any damage which in the opinion of the Employer could

be avoided, shall be borne by the Contractor.

Other trees and tall scrub shall be cleared to a distance of 25 m on either side of the centreline ofthe route. Trees and bushes shall be cut down to a height of not more than 0.5 m above ground

level and not removed by bulldozer.

In addition, tall trees outside the cleared area shall be trimmed by the Contractor to such a heightthat while falling the distance of 2 m from the conductors shall be kept.

No tree may be cut without the explicit permission of the Employer. Roots and other plants shall notbe removed to prevent excessive surface erosion.

The Contractor shall take all appropriate precautions when clearing vegetation in the vicinity of public


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buildings, streams, roads and private houses. The streams embankment should be restored/reinforced

to avoid future erosion. Fallen trees shall be removed from these areas immediately after clearing. Any

damage caused by carelessness, ignorance and over-sight shall be compensated by the Contractor.

The necessary permission for the removal of obstructions such as fences, buildings,

telecommunication and power lines will be in the responsibility of the Employer. No obstruction may be

removed without the explicit permission of the Employer.

2.3.6.2 Re-Clearing

Before issuing the final acceptance certificate or at the time agreed by the Employer, the Contractor

shall have re-cleared the vegetation within the easement to the standard specified.

2.3.6.3 Crossing of Obstacles

The Contractor shall, at his own expense, make any necessary arrangement and take the necessary

precautions where the route crosses buildings, telecommunication and power lines, orchards,

gardens, railways, antiquities or other obstructions or ground over or across where erection cannot be

carried out without precautions that require scaffoldings or roof protections.

These arrangements, supported by calculations and drawings for each crossing, should be presented

in a suitable document and shall be for the approved by the Employer / Employer's Representative.

The Contractor shall provide all necessary scaffolding and the like for the crossing of

telecommunication or power lines, roads, railways, buildings or other obstacles. The Contractor shall

advise the Employer in each case of the scaffolding he proposes to use. Drawings of the proposed

scaffoldings shall be submitted to the Employer / Employer's Representative for approval (see alsochapter2.3.7.4).

2.3.7 OPGW Stringing

2.3.7.1 Handling and Storage

Whether in storage and during handling, all OPGW reels shall be kept clear off the ground and in

clean conditions. Contact with any substances likely to damage the materials and reels shall be

avoided.

The Contractor shall take adequate precautions during handling, storage and installation to prevent

kinking, twisting, nicking or other damage to the materials and reels. The conductors and OPGW shall

never be dragged over the ground or any other rough surface.

Suitable precautions shall be taken to avoid dropping down of reels during loading or unloading from

vehicles.

2.3.7.2 Stringing Plan

At least one month before stringing commences, the Contractor shall give due consideration to all the

factors involved and shall submit to the Employer / Employer's Representative for approval a fully

detailed stringing schedule, stating locations of earthwire drums, tensioners and pullers, the proposedposition of mid-span joints, together with temporary reinforcement of towers or their crossarms and all


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other relevant information required for the stringing operations, including the maximum tensions to be

used during running out of pilot wires and OPGW.

2.3.7.3 Tools and Equipment

Tools and equipment shall conform to IEEE Standard 524 (Guide to the Installation of Overhead

Transmission Line Conductors) and to the conditions as specifically described hereunder.

Reel Stands

Reel stands shall be strongly constructed and reel brakes shall be provided. Braking of the OPGW

reels during stringing shall be positively controlled and shall be applied in a manner which avoids

damage to the conductor or OPGW or to the reels.

Pilot Wire

Pilot wires shall be made of non-twist steel wire. The pilot wire shall be strong enough for stringing

work. The Contractor shall be responsible for clearing a narrow passes way (about 2 m wide) along

the centre line of the line route for laying out the pilot wire manually.

Powered Puller

The powered puller shall have a capacity of not less than the maximum stringing tension of the

OPGW. The puller system shall have a powered winch with transmission gears for changing speed

during stringing work.

Tension stringing equipment

Tension stringing equipment shall be of neoprene or Teflon lined bull wheel type. The bull wheel brake

or brake control shall be designed such that when the maximum tension is obtained, the tension will

be held constant so long as the brakes are left at this setting. The tensioner shall be equipped withearthing conductor through device. The bull wheel diameter and lining material shall be approved by

the Employer / Employer's Representative. A neoprene or Teflon lining material, at least 6mm thick,

would be acceptable.

Compressors for Joints and Dead End Connector Assemblies

Suitable hydraulic compressors equipped with pressure gauges and dies or other approved types shall

be used for tension joints and compression dead-end connections. This shall thoroughly satisfy the

requirements for jointing of the conductor.

Length meter

A length meter for measuring the OPGW during stringing shall be provided and may be part of either

the powered puller or the tension stringing equipment.

2.3.7.4 Crossing of Roads, Power Lines etc.

Scaffolding shall be provided over roads, power and communication lines, houses etc. The cost of all

scaffolding shall be included in the stringing price.

The scaffolding which is used to cross specified low, medium and high voltage power lines shall be of

such dimensions and allow such clearances that the power lines being crossed may remain in

operation during construction of the new transmission line unless stringing is made over the crossing.

Shut-downs on the lines to be crossed will be given for stringing however their duration shall be kept

to the minimum. Such restrictions in building and use of the scaffolds shall not be grounds for claimingadditional costs.


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The scaffold shall be designed to withstand the maximum design wind speed, except that a reduced

return period will be accepted. Consideration shall also be given to impact loading by dropping of the

upper phase conductor. The scaffold shall consist of square mesh nylon nets attached to steel wireropes running perpendicular to the lower line route, carried by metal scaffolding at 3 m intervals. The

nets shall be attached to the catenary wires by means that do not require the presence of any persons

on the net or the catenary wires whilst the lower line is alive. An additional movable walk net laid over

the mesh nets may be used whilst the lower line is dead. Normally steel or aluminium tubular

scaffolding should be used.

Scaffold design shall duly consider safety requirements with particular respect to accidental contact

with live conductors during construction, use and removal.

The scaffold, including foundations, shall be designed and constructed to ensure stability during the

erection and removal, and also at times when work has ceased for any reason including adverse

weather conditions. The foundations shall be suitable for soil characteristic at site. The scaffold shall

extend at least 5 m either side of the outermost conductors of the upper line. A maximum of 2 m of this

distance may be provided by means of catchers. Catchers shall be provided at each end of each

scaffold support. The catchers may be vertical or inclined to a maximum angle of 45 from the vertical.

They shall be capable of withstanding the specified impact loads without excessive distortion that

would permit a falling conductor to approach or touch a live line.

The upper parts of the scaffold shall be provided with soft wood rubbing boards or otherwise protected

in an approved manner to prevent damage to the conductors resting on or being drawn over the

guard. Soft wood poles may be used for this purpose. The height of these boards shall be sufficient to

prevent the conductor damaging the nylon net. To avoid damaging the conductors, no object otherthan non-metallic lashing or the catchers shall protrude above the rubbing boards.

The scaffolds shall be constructed to prevent unauthorized access or climbing by the use of barbed

wire anti-climbing devices, fences or other means approved by the Employer. The scaffolding shall be

lit with red warning lamps during the night if erected within 2 m from a highway or footpath without

fencing.

Where possible, the resistance to earth of the scaffold shall be less than 10 ohms. Bonding the

scaffold to the earthing systems of either the live line or the line under construction normally is not

acceptable. In the former case, a nearby line fault could cause the scaffold to become live. In the latter

case, a fault between the live line and the scaffold could cause components of the line under

construction to become alive, particularly as its earthing system may not be complete. The earth rods

should normally be driven into the ground 1.0m out of the scaffold's structure perimeter.. The rods

should be securely connected electrically and mechanically to the scaffold structure by flexible copper

or aluminium leads with minimum cross-sections of 64 mm or 100 mm respectively.

Drawings of the scaffold, complete with details of the clearance plates and earthing arrangement,

together with supporting, calculations shall be submitted to the Employer / Employer's Representative

for approval.

2.3.7.5 Stringing OPGW

The Contractor shall ensure the Manufacturer's instruction for specific stringing requirements.


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Stringing and sagging of OPGW shall be done in accordance with the detail system design which is

subject to approval by the Employer prior to commencement of any field works.

OPGWs shall be kept off the ground at all times when the OPGW is in motion. Tension stringing of allOPGWs shall be continuously controlled.

The Contractor shall take special care that the OPGWs are not dragged on the ground at any time

during erection or come into contact with any obstacles such as walls, fences or buildings, etc.

OPGW drums shall be closely examined before pulling commencement, and all nails and other items

that could damage the OPGW shall be removed. During stringing, the OPGW drums shall be

supervised at all times, and the OPGW shall be inspected for defects while it is being pulled off the

drum. Watchmen shall be positioned at critical structure locations to ensure a smooth stringing

operation.

The OPGW tension during stringing operations shall be kept as low as possible, consistent with

keeping the conductor at safe distance from the ground whilst in motion. At no time will the tensions

be allowed to exceed 1.5 times of the permissible installation tension.

All stringing equipment shall be properly anchored and shall be positioned in such a way that towers

and fittings will not be overloaded. OPGW reels shall be securely anchored during stringing

operations, and reel jacks shall be of the self-braking type to prevent OPGW overrun. OPGW pulling

equipment shall be such as to ensure a continuous steady pull. Every precaution shall be taken to

prevent damage to the OPGW. Clamps and other devices used for handling the OPGW during

erection shall allow no slippage or relative movement of strands or layers and shall not pinch or

deform the OPGW.

Cable rotation shall be avoided during the installation of the OPGW in sections.

During the installation of the OPGW through the tower, cable rotation as caused by stretching out of

the OPGW and kinking shall be avoided.

The OPGW shall be strung prior to stringing of the conductors. The OPGW shall be strung for whole

line sections, without joints. The tools and equipment used shall be earthed.

The OPGW shall also be sagged prior to sagging of the conductors.

Suspension clamps shall be installed such that the earthing bond wires all face the same direction and

the ends of the bond wires shall be clamped to structures in a manner approved by the Employer /

Employer's Representative.

Vibration dampers shall be installed on the OPGW based on the recommendations of the damper

study, on the Manufacturer's recommendation and as approved by the Employer / Employer's

Representative.

2.3.7.6 Earthing of Conductors, OPGW and Stringing Equipment

Conductors and OPGW shall be effectively earthed in an approved manner during running out at all

places where men are working on them.


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Sufficient earth to maintain safety shall be kept until the time of taking over. The position of each earth

shall be recorded by the Contractor.

Conductor sheaves lined with neoprene or rubber shall have an electrical conducting path betweentheir suspension points and the conductor or OPGW supported within them and shall run with

minimum friction.

When stringing operations are carried out close to or over/under crossing energized lines, the

Contractor shall take all precautions necessary to prevent accidents and injuries to persons and

property due to induced voltage or physical contact.

The main method to protect the workers against electric current induced by an energized transmission

line is reliable grounding of conductors (wire cables) of every line section as a whole and immediately

at the spot, where installation works are carried out.

Prior to stringing of the conductor (wire cable), each drum shall be grounded by attaching the "earthing

bushing" of the tensioner (breaking machine) and puller to the tower grounding.

The stringing works may not commence unless the earthing is completed otherwise the works shall be

performed using dielectric gloves.

The strung conductor (wire cable) shall be grounded every time it is suspended onto the tower.

After completion of stringing the conductor from the drum the conductor (earthwire) shall be securely

earthed and the last