page no. : 1 distribution and transmission overhead lines

Israel Electric Corp. Ltd. Customer Service Division

National Grid Unit Overhead Lines Department

Edition no.: 3 Specification NCS 163 For stockbridge type vibration dampers for

distribution and transmission overhead lines Issued date: 18/06/2018 Page no. : 1 of 22

1

SPECIFICATION FOR

STOCKBRIDGE TYPE VIBRATION DAMPERS

FOR DISTRIBUTION AND TRANSMISSION

OVERHEAD LINES

חתום)-( Prepared by: Eng. N.Mizrachi

חתום)-( Checked by: Eng.Y.Samoocha

חתום)-( Approved by: Eng. Y. Samoocha

Israel Electric Corp. Ltd.

Customer Service Division

National Grid Unit

Overhead Lines Department

Edition no.: 3 Specification NCS 163

for stockbridge type vibration dampers for

distribution and transmission overhead lines Issued date: 18/06/2018

Page no. : 2 of 22

2

Contents:

No. of para. Page No.

1. Scope 3

2. Threshold conditions 3

3. Documents for the proposal 4

4. Manufacturing standards 5

5. Technical requirements 6

6. Material 14

7. Tests inspection and reports 14

8. Marking 15

9. Packing 15

10. Quality assurance 15

11. Quality control 15

12. Delivery approval conditions 16

13. Summary of data 17

14. Appendix 1:"Statement of manufacturing experience" 18

15. Appendix 2:"Obligation to submit Damping study upon award of bid" 19

16. Appendix 3:"Obligation to submit type test report upon award of bid" 20

17. Appendix 4:"schedule up to delivery" 21

18. Revision 22

Appendices:

1. Standard specification for quality control Q-APP-02 Rev.4.



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1. SCOPE

This specification covers manufacture, preserve, testing, packing and furnish of stockbridge

vibration dampers to be used on AAAC, OPGW and ACSR conductors for transmission and

distribution overhead lines.

The purpose of the vibration damper is to reduce the effects of Aeolian vibration.

The manufacturer will be responsible for design and manufacturing the specific damper according to

IEC requirements.

I.E.C catalogue numbers are:

I.E.C. catalogue number Stockbridge damper suitable for:

2461242 ACSR 210/35 ST1A/AL1

2461341 ACSR 300/50 ST1A/AL1

2461622 ACSR 680/85 ST1A/AL1

5292744 AAAC 120 AL3

5292745 AAAC 185 AL3

2461630 AAAC 241 AL7

2461648 AAAC 593 AL59

3850443 AAAC 774 AL59

3639192 UPAS 362 AL59

5239536 OPGW 118 (including protection rods)


5239267 Installation on AGS armor rods and/or dead end set

reinforcing rods for OPGW 118.

5239524 Installation on AGS armor rods and/or dead end set

reinforcing rods for OPGW 245.

Remarks: - IEC Cat. No. 5239536: the Stockbridge will be supply with protection rods.

- IEC Cat. No. 5239537: the Stockbridge will be supply with protection rods.

- IEC Cat. No. 5239536 + 5239267 for OPGW 118 will be from the same manufacturer.

- IEC Cat. No. 5239537 + 5239524 for OPGW 245 will be from the same manufacturer.

2. THRESHOLD CONDITIONS

Acc. to the attached documents of the procurement division.



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3. DOCUMENTS FOR THE PROPOSAL The Bidder will submit together with his offer the following documents from the manufacturer:

3.1. Valid ISO 9001 certificate, as defined in the threshold conditions.

3.2. Appendix 1:"statement of manufacturing experience", signed for each of the proposed item.

3.3. Appendix 2: "Obligation to submit damping study upon award of bid", signed for each of the

proposed item.

3.4. Assembly drawing for each of the proposed item showing the vibration damper in at least two

views, the following data shall be given on the drawing:

- Catalog Number

- Main dimensions

- Conductor diameter range for the damper clamp

- Width across flats for bolts and nuts

- Tolerances, Tightening torque

- Markings

- Weight

- Part List

- Materials.

- Coating (type and thickness).

In addition for OPGW 118 & 245 (IEC catalogue number: 5239536 and 5239537)

- Drawing of the protection rods with the following data:

Catalogue number, main dimensions (length and diameter of each rod ), marking (including

identification central mark), material and no. of rods.

3.5. Type test reports:

Bidder will submit one of the following:

Type test report according to IEC 61897 (acc. to par 7 in this spec.) for each of the proposed

items.

Or

Type test report (for one item) according to the relevant standard (and acc. to par 7 in this

spec.) for similar item.

And

Appendix 3: "Obligation to submit type test report upon award of bid" 'signed by the bidder

and the manufacturer 'for each of the proposed item.

Appendix 4: "Schedule up to delivery approval", signed by the bidder and the manufacturer

for each of the proposed item.

"Similar" means stockbridge type vibration in the same technology but for different

conductors cross section.

3.6. Complete and filled in summary of data (par. 13), for each of the proposed item.

3.7. Installation instruction for OPGW.

3.8. A table with quantity and in span location with a reference to the table in par 5.4

(and estimate quantity and in span location for I.E.C cat. no. 5292744 and 5292745).



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Remark: A manufacturer that is proposing the same item (identical) that was previously

supplied to I.E.C, which I.E.C has good experience with, may ask, and I.E.C will

consider, exempting from the submission of the documents in par. 3.5. I.E.C reserves

the right to request, at its sole discretion, from the bidder to complete these documents

or any other clarifications.

- The above mentioned documents will be in English or Hebrew.

- All dimensions and quantities must be in M K S (Meter, Kilogram, Second)

Measurement units.

- Bidder which will not submit all the above will be disqualified.

4. MANUFACTURING STANDARDS The vibration dampers shall be manufactured and tested in conformance with the latest

published recommendation of the following standards:

– IEC 61897 – Requirements and tests for stockbridge type dampers.

– IEC 61284 – Overhead lines-requirements and tests for fittings.

– IEC 60888 – Zinc-coated steel wires for stranded conductors.

– EN 50182 – Conductors for overhead lines round wire concentric lay stranded conductors.

– DIN EN ISO 4017: Fasteners - Hexagon head screws - Product grades A and B.

– DIN EN ISO 4032: Hexagon regular nuts (style 1) - Product grades A and B

Alternative standards for DIN EN ISO 4017, DIN EN ISO 4032 should be stated by the bidder

and will be considered by I.E.C. (the stated standard will be send together with the Documents

for the proposal).



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5. TECHNICAL REQUIREMENTS

5.1. Design 5.1.1. The damper shall be designed according to the standard IEC 61897.

5.1.2. The vibration damper shall be designed for use on phase or earth conductors as listed

in par. 5.2.2 in this spec.

5.1.3. The vibration damper shall not damage or cause corrosion to the conductor when

installed or during service.

5.1.4. The vibration damper shall be of the stockbridge type only.

5.1.5. The design of the stockbridge damper shall be such as to avoid local corona formation

and significant radio interference.

5.1.6. The dampers shall not contain non-metallic materials.

5.1.7. The dampers shall be free of defects such as cracks and edges.

5.1.8. Welding will not be accepted.

5.1.9. For OPGW 118 stockbridge cat. no. 5239267:

The clamp will be suitable to be install on AGS armor rods or dead end set reinforcing

rods:

- Diameter of the Armor rods of the AGS: 4.62 mm.

- Diameter of the Dead end set reinforcing rods: 3.25-3.45 mm.

5.1.10. For OPGW 245 stockbridge cat. no. 5239524:

The clamp will be suitable to be install on AGS armor rods or dead end set

reinforcing rods:

- Diameter of the Armor rods of the AGS: 6.35mm

- Diameter of the Dead end set reinforcing rods: 4.24 - 4.65 mm.

5.1.11. Protection rods for I.E.C cat. No. 5239536 &5239537 should have different color code.

5.2. Environmental and conductor technical data

5.2.1. Environmental

The lines may run through either open undulating country with some trees, or

mountainous country, or open desert areas:

– Severe atmospheric and industrial air pollution, coal, dust, sea salt.

– High atmospheric humidity as experienced in coastal or desert areas.

– Annual variation in air temperature: -10°C to +50°C.

– Annual mean air temperature: +25°C.

– Maximum relative humidity: 95%.

– Average relative humidity: 70%.

– Average ambient temperature measured over a period of 24 hours does not exceed:

+35°C.

– Maximum difference of ambient temperature from day to night: +25°C.

– Long summer periods with OTCs of sunshine (1120W

/m2) according to IEC

Publication 60721-3-4/95.

– Altitude: up to 1500m.

– Rapid temperature changes and humidity changes.

– Long summer periods without rain.

– Maximum wind velocity: 50 m

/sec.



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5.2.2. Conductors

Technical data for the conductors is in tables below:

AAAC

241

AAAC

185

AAAC

120

ACSR

680/85

ACSR

300/50

ACSR

210/35

Conductor cross

section & type

SS 4240811

&

SS 4240812

EN 50182 EN 50182 EN 50182 EN 50182 EN 50182 Standard

19x4.02 37x2.5 19x2.8 54x4.0 Al

19x2.4 St

26x3.86 Al

7x3.0 St

26x3.2 Al

7x2.49 St

Construction of

conductor

[no x mm]

20.1 17.5 14 36 24.4 20.3 Diameter of

conductor [mm]

241.2 181.6 117 764.6 353.7 243.2 Cross section of

conductor [mm2]

61.6 53.58 34.51 206.25 105.09 73.36 Min Breaking load

[KN]

663 500.3 321.2 2549.7 1227.3 844.1 Weight [kg/km]

-before creep:

2100 m

-after creep:

1780 m

-before creep:

2100 m

- after creep:

1780 m

-before creep:

1230 m

-after creep:

1100 m

-before creep:

2100 m

- after creep:

1670 m

-before creep:

2100 m

- after creep:

1670 m

-before creep:

2100 m

- after creep:

1670 m

Max. ratio

(tension to weight

at 20 ˚C) for

protection

conductors

- - - - - +

Regular

suspension clamps

will include rods

over the wire

+ - - + + -

Suspension

clamps shall be

AGS type or

regular suspension

clamps.

1524 - - 2235 1700 1930 The length of the

armor rods [m]

+ + + + + + Wedge-type

tension clamps

shall be used

- Length is

900 mm

Length is

600 mm - - - On post insulators-

distribution ties



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OPGW

245

OPGW

118

UPAS AL59

362

AAAC AL59

774

AAAC AL59

593

Conductor cross

section & type

Specification

NCS-8

Specification

NCS-8 EN 50182

SS 4240813

&

SS 4240814

SS 4240813

&

SS 4240814

Standard

- - 37x3.53 61x4.02 61x3.52 mm Construction of

conductor [no x mm]

20.58±0.36 14.84±0.26 24.71 36.2 31.7 Diameter of conductor

[mm]

245 118 362.1 774.2 593.6 Cross section of

conductor [mm2]

70 40 86.91 178 143 Breaking load [KN]

740-900 460-500 986.68 2140 1640 Weight [kg/km] -before creep:

2100 m

-after creep:

1780 m

-before creep:

2100 m

-after creep:

1780 m

-before creep:

2000 m

-after creep:

1780 m

-before creep:

2000 m

-after creep:

1780 m

-before creep:

2000 m

-after creep:

1780 m

Max. ratio (tension to

weight at 20 ˚C) for

protection conductors

+ + - - - Suspension clamps

shall be AGS type

- - + + +

Suspension clamps

shall be AGS type or

regular suspension

clamps.

1550 1140 1700 2235 2235 The length of the

armor rods [mm]

- - + + + Wedge-type tension

clamps shall be used

+ + - - - Tension shall be with

helical end type

5.3. Technical data for Warning Markers that installed on the conductors as par. 5.2.2

Without heliformed assembly With heliformed assembly Type

500 500 Diameter [mm]

4 5 Weight [Kg]

525 1500

(included heliformed dead end) Overall length [mm]

Every 40 m Every 40 m Span between two adjacent

Spherical warning



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5.4. Damper's location and quantities 5.4.1. Damper in-span location and quantity in I.E.C overhead lines is acc. to the following

tables:

Suspension –suspension

in span location (m)

501-600 151-500 0-150

Side 1 Side 2 Side 1 Side 2 Side 1 Side 2 I.E.C cat.

No. of the

damper

Conductor

size

1 1 1 1 quantity 2461242 ACSR

210/35 A=10 A=10 A=10 A=10 distance(cm)


300/50 A=10 A=10 A=10 A=10 distance(cm)

1 1 1 1 1 quantity 2461622 ACSR

680/85 A=60 A=60 A=60 A=60 A=60 distance(cm)

2 2 1 1 1 quantity 2461630 AAAC

241 A=10

B=80

A=10

B=80

A=10 A=10 A=10 distance(cm)

2 2 1 1 1 quantity 3639192 AAAC

UPAS 362 A=10

B=80

A=10

B=80


2 2 1 1 1 quantity 2461648 AAAC

593 A=40

B=90

A= 40

B=90


2 2 1 1 1 quantity 3850443 AAAC

774 A= 60

B=100

A=60

B=100


Side 1 Side 2



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Suspension –tension

In span location

501-600 151-500 0-150 I.E.C cat. No.

of the damper

.

Conductor

size Side 1 Side 2 Side 1 Side 2 Side 1 Side 2

1 1 1 1 1 quantity 2461242 ACSR

210/35 A1=10 A2=80 A1=10 A2=80 A1=10 distance(cm)

1 1 1 1 1 quantity 2461341 ACSR


1 1 1 1 1 quantity 2461622 ACSR


2 2 1 1 1 quantity 2461630 AAAC

241 A1=10

B=80

A2=80

B=80

A1=10 A2=80 A1=10 distance(cm)

2 2 1 1 1 quantity 3639192 AAAC

UPAS 362 A1=10

B=80

A2=80

B=80


2 2 1 1 1 quantity 2461648 AAAC

593 A1=40

B= 90

A2= 130

B=90


2 2 1 1 1 quantity 3850443 AAAC

774 A1=60

B=100

A2=150

B=100


side 2 side 1



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tension –tension

In span location(m)

501-600 151-500 0-150 I.E.C cat. No.

of the damper

Conductor

size Side 1 Side 2 Side 1 Side 2 Side 1 Side 2


210/35 A=80 A=80 A=80 A=80 distance(cm)


300/50 A=80 A=80 A=80 A=80 distance(cm)

1 1 1 1 1 quantity 2461622 ACSR

680/85 A=150 A=150 A=150 A=150 A=150 distance(cm)

2 2 1 1 1 1 quantity 2461630 ACSR

241 A=80

B=80

A=80

B=80

A=80 A=80 A=80 A=80 distance(cm)

2 2 1 1 1 1 quantity 3639192 AAAC

UPAS 362 A=80

B=80

A=80

B=80


2 2 1 1 1 quantity 2461648 AAAC

593 A=130

B=90

A=130

B=90


2 2 1 1 1 quantity 3850443 AAAC

774 A=150

B=100

A=150

B=100


side 1 side 2



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For OPGW 118&245

suspension-suspension

suspension-tension

In span location(m)

501-600 151-500 0-150 I.E.C cat. No. of the

damper

conductor

Side 1 Side 2 Side 1 Side 2 Side 1 Side 2

2 2 1 1 1 1 quantity 5239267 or/and

5239536 OPGW 118

A=10

B=60

A=10

B= 60


2 2 1 1 1 1 quantity 5239524 or/and

5239537

OPGW 245

A=10

B=60

A=10

B=60


In span location(m)

501-600 151-500 0-150 I.E.C cat. No. of the

damper

conductor


2 2 1 2 1 2 quantity 5239267or/and

5239536 OPGW 118

A1=10

B=60

A2=40

B=80

A1=10 A2=40

B=80

A1=10 A2=40

B=80

distance(cm)

2 2 1 2 1 2 quantity 5239524 or/and

5239537 OPGW 245

A1=10

B=60

A2=40

B=80

A1=10 A2=40

B=80

A1=10 A2=40

B=80

distance(cm)

Side 2 Side 1

Side 2 Side 1

I.E.C Cat no. 5239267 or 5239524

I.E.C Cat no. 5239536 or 5239537

I.E.C Cat no. 5239267 or 5239524

I.E.C Cat no. 5239536 or 5239537



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tension-tension

In span location(m)

501-600 151-500 0-150 I.E.C cat. No. of the

damper

conductor


2 2 2 2 2 2 quantity 5239267 or/and

5239536 OPGW 118

A=40

B=80

A=40

B=80

A=40

B=80

A=40

B=80

A=40

B=80

A=40

B=80

distance(cm)

2 2 2 2 2 2 quantity 5239524 or/and

5239537

OPGW 245

A=40

B=80

A=40

B=80

A=40

B=80

A=40

B=80

A=40

B=80

A=40

B=80

distance(cm)

Side 2 Side 1

I.E.C Cat no. 5239267 or 5239524

I.E.C Cat no. 5239536 or 5239537



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6. MATERIAL

6.1. Material and surface treatments The choice of material and surface treatments shall be such that the dampers shall be

resistant to atmospheric corrosion during the entire operating time.

6.2. Damper Clamps Damper clamps shall be manufactured from aluminum alloy. The alloy must be resistant to

cracking, stress corrosion and layer corrosion.

6.3. Protection Against Corrosion The clamping bolts, washers and spring shall be hot dip galvanized steel acc. to ISO 1461.

The messenger cable shall be coated acc. to IEC 60888.

7. TESTS INSPECTION AND REPORTS

The following tests for each item will be made in accordance with the latest published

recommendations of the standard IEC 61897:

7.1. Type test

7.1.1. Visual examination acc. to clause 7.1.

7.1.2. Verification of dimensions, materials and mass acc. to clause 7.2.

7.1.3. Corrosion protection tests acc. to clause 7.3.

7.1.4. Clamp slip test acc. to clause 7.5.

7.1.5. Clamp bolt tightening test acc. to clause 7.7.

7.1.6. Attachment of weights to messenger cable acc.to clause 7.8.

7.1.7. Attachment of clamp to messenger cable test acc.to clause 7.9.

7.1.8. Corona and radio interferences voltage (RIV) will be tested acc. to clause 7.10

(Not for AAAC 241, OPGW 245, OPGW 118 and ACSR 210/35 conductors).

7.1.9. Damper performance tests acc. to 7.11 Variant B-Laboratory tests.

7.1.10. Damper fatigue test acc. to clause 7.12 – swept frequency method.

7.2. Sample test

7.2.1. Visual examination acc. to clause 7.1.

7.2.2. Verification of dimensions, materials and mass acc. to clause 7.2.

7.2.3. Corrosion protection tests acc. to clause 7.3.

7.2.4. Clamp slip test acc. to clause 7.5.

7.2.5. Clamp bolt tightening test acc. to clause 7.7.

7.2.6. Attachment of weights to messenger cable acc. to clause 7.8.

7.2.7. Attachment of clamp to messenger cable test acc. to clause 7.9.

7.3. Damping study acc. to the data in tables on par. 5.4 for each of the proposed item, the study

will:

- Be for suspension-suspension, suspension-tension, tension-tension.

- Include data for span length greater than 600-1000 m and height differences.



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8. MARKING

Each damper shall be marked in a durable and legible manner with the following:

Manufacturer’s name or trade mark.

Conductor diameter range for the damper clamp.

Quality indication on bolt.

Tightening torque.

For OPGW 118 & OPGW 245:

Each rod set will be marked with a label the label will contain the following information:

The P/N

Manufacturer’s name or trade mark.

Conductor cross section.

Identification central mark (colure code).

The marking will be indelible and legible.

9. PACKING The dampers (for each type) will be supplied in wooden boxes, properly packed and lagged to

prevent the dampers from possible damage during shipment and storage.

Each box will contain the same quantity of items.

Each packing shall be marked with:

IEC order number.

Manufacturer name or trade mark.

Conductor diameter range for the damper clamp.

Number of dampers in the package.

Gross weight.

IEC catalogue number.

Manufacturer's part number (P/N )

Remarks:

1. for cat. no. 5239536 and 5239537 the stockbridge damper and the protection rods will be packed

together.

2. The wooden box dimensions shall be 1 m x 1.2 m with access for a fork–lift

10. QUALITY ASSURANCE

Manufacturer’s Quality Assurance Program shall meet the requirements described in ISO 9001.

11. QUALITY CONTROL

Quality control requirements will be according to I.E.C standard Q-APP-02 Rev.4.



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12. DELIVERY APPROVAL CONDITIONS 12.1. The successful bidder who submitted Type test report for the proposed item will submit

- Damping study within one month upon award of bid.

- sample tests reports before the shipment of each delivery

12.2. The successful bidder, who submitted Type test report for a similar item, shall submit:

12.2.1. All the required documents for I.E.C approval and within the period of time as

indicated in the attached appendix 4 - "schedule up to delivery approval".

12.2.2. Damping study as in par. 7.3 for each of the proposed item.

12.2.3. Sample tests reports will be submitted before each delivery.

In order to perform the tests the bidder can receive the required Conductor from I.E.C

Warehouse. (Shipping costs will be at the expense of the successful bidder).

"If the contractor fails to fulfill in the above requirements, in accordance with the

terms of the tender documents and/or the order/contract within the periods

above, it shall constitute a substantial breach, entitling the I.E.C. to be paid

liquidated damages according to Tender document, and to pursue all other

remedies available under the law for a substantial breach of contract."

12.3. Acceptance tests: The I.E.C. reserves the right to verify the compliance of the delivered items with this

specification.

Delivery which will not pass acceptance tests will be rejected.



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13. SUMMARY OF DATA

13.1. Bidder's name: __________________________________________

13.2. Bidder's phone no.: __________________________________________

13.3. Bidder's fax: __________________________________________

13.4. Bidder's E-mail: __________________________________________

13.5. Bidder's signature: __________________________________________

13.6. Manufacturer 's name: __________________________________________

13.7. Manufacturer's address: __________________________________________

13.8. Manufacturing country: __________________________________________

13.9. Manufacturer's E-mail: __________________________________________

13.10. Manufacturer's signature: __________________________________________

(Insert all data in this column)

1. Is ISO 9001 certificate attached? [yes/no]

2. Is Appendix1, 2, 3, 4 Attached? [yes/no]

3. Is marking acc. to par 8? [yes/no]

4.Please state the manufacturing standard of the stockbridge

5. Is marking acc. to par 9? [yes/no]

6. Is installation instruction for OPGW attached? [yes/no]

7. Is type test report for propose items attached? [yes/no]

(Insert all data in this column)

IEC cat. no. Stockbridge damper suitable for: Manufacturer P/N Manufacturing

drawing no.

2461242 ACSR 210/35

2461341 ACSR 300/50

2461622 ACSR 680/85

5292744 AAAC 120

5292745 AAAC 185

2461630 AAAC 241

2461648 AAAC 593

3850443 AAAC 774

3639192 UPAS 362 Al 59



5239267 Installation on AGS armor rods

and/or dead end set reinforcing rods for

OPGW 118.

5239524 Installation on AGS armor rods

and/or dead end set reinforcing rods for

OPGW 245.



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14. APPENDIX 1: STATEMENT OF MANUFACTURING EXPERIENCE

I, ____________________ (enter name), hereby state the following:

1. I_____________ (enter name), am authorized to sign this statement on behalf of___________________

("the Manufacturer")

2. I hold the position of ____________________________________ ____________________________

(enter job title and description, i.e. partner, production manager, sales manager, etc.) at the Manufacturer.

3. I have been in this position since ____________ (enter date).

4. I am providing this statement with regards to I.E.C's tender number ________________ ("the Tender").

5. _________________ (the Manufacturer) has experience in manufacturing of stockbridge type

vibration dampers for the proposed item/s or similar item/s, for at least two (2) years in the last five

(5) years.

"Similar" means stockbridge type vibration dampers in the same technology but for different

conductors cross section

6. The facts/details given in this statement have been checked and verified by me.

7. I hereby undertake to provide, upon IEC's request and at its sole discretion, any other documents

(reference list, quantity, dates of supply, letter of recommendations etc.) or other Information requested

for this tender for purposes of proving said experience.

_______________

Signature

_______________

Date



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15. APPENDIX 2: OBLIGATION TO SUBMIT DAMPING STUDY UPON AWARD OF

BID

1. We hereby undertake to perform Damping Study required for the proposed items (as in table

below), upon award of bid.

2. The Damping Study will :

- Be for suspension-suspension, suspension-tension, tension-tension.

- Include data for span length greater than 600-1000 m and height differences.

No. of tender: _____________________

Manufacture name : ______________

Bidder name: ___________________

Date: _____________________________

I.E.C Cat. No Manufacturer P/N No. of tender Manufacture

name and

signature

Bidder name

and signature

Date

2461242

2461341

2461622

5292744

5292745

2461630

2461648

3850443

3639192

5239536

5239537

5239267

5239524



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16. APPENDIX 3: OBLIGATION TO SUBMIT TYPE TEST REPORT UPON AWARD OF

BID

1. We hereby undertake to perform all the tests (mechanical and electrical) required for the

proposed items (as in table below), upon award of bid.

2. The tests will be performed in accordance with the standards and requirements specified in

paragraph 4 and 5 and 7 of this specification.

3. Test reports will be submitted as acc. to schedule in appendix 4.

No. of tender: _____________________

Manufacture name and signature: ______________

Bidder name and signature: ___________________

Date: _____________________________

I.E.C Cat. No Fill in Yes/No

2461242

2461341

2461622

5292744

5292745

2461630

2461648

3850443

3639192

5239536

5239537

5239267

5239524

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National Grid Unit


Specification NCS 163

for stockbridge type vibration dampers fort

distribution and transmission overhead lines

Edition no.: 3

Issued date 18/06/2018

Page no. :22 of 22

22

18. REVISIONS

1.Specification NCS 163/0 - replaces and cancels JDHK

7719/5.

2.Chang in par. 3,5.3.2,6.3,10,11,12 and del requirement in prev. edition:

Par. 5.1.5:"damper clamp will be with groove"

Par.:5.1.6:" damper with closed weights shall be designed to prevent water collection"

3.Del IEC Cat. no.: 4246781 and 4246773; add 4 new cat. no. 5239536,5239267,5239537,

5239524, change in par. 1,3,5.1,5.3,8,9,16.

4.Change in all par. ,add 2 stockbridge dumper for AAAC120&185 ,add requirement for

damping study.