11kv cables

ANNEXURE-F PART 3 DISTRIBUTION 390

TECHNICAL SPECIFICATIONS FOR R-APDRP PART-B

46. TECHNICAL SPECIFICATION FOR 11 KV AERIAL BUNCHED XLPE INSULATED CABLES FOR

OVERHEAD LINES (CROSSED LINKED POLYETHYLENE DRY GAS CURED)

1. SCOPE

This specification covers requirements of 11 KV Aerial Bunched XLPE insulated Aluminium Cables

for use in overhead lines under PSPCL. The sizes are as under:-

Sr. No. Size mm2

1 3Cx50+35

2 3Cx95+70

3 3Cx120+70

4 3Cx150+150

2. COMPOSITION OF THE CABLE

The composite cable shall comprise three single-core cables twisted around a bare aluminium alloy

messenger wire, which will carry the weight of the cable.

3. RATED VOLTAGE

The rated voltage of the cables shall be 6.35KV/11KV and the maximum operating voltage shall be

12 KV.

4. APPLICABLE STANDARDS

Unless otherwise stipulated in this Specification, the following Standards with the latest

amendments shall be applicable. Any deviation from the standards should be indicated specifically

and with recorded reasons.

Sr.No. Applicable IS Description

1 IS:7098(Part-II)-1985 Cross linked Polyethylene Insulated PVC Sheathed Cables.

2 IS:8130-1984 Conductors for Insulated Cables

3 IS:10810/1984 (series) Methods for tests for cables

4 IS:10418/1982 Drums for electric cables

5 IS:398 (Part-4) 1994 Aluminium Alloy conductors

6 IS:5831/1984 PVC Insulation and sheath of electric cable

7 IS:14255 : 1995 Aerial Bunched Cables for working voltage upto& including

1100 V

8 IEC-60502(Part-II) Polyethylene Outer Sheath

5. CLIMATIC CONDITIONS :

The service / climatic conditions are given in 1.2 of part-A. The material shall be for use in

moderately hot and humid tropical climate, conducive to rust and fungus growth .



6. DETAILS OF SINGLE CORE CABLE:-

6.1 CONDUCTORS :

The cable conductors shall be of round, stranded and compacted aluminium conductors of

minimum cross sectional area 50mm2/95mm2/120mm2/150mm2. The aluminium

conductors shall comply with the requirements as specified in IS. 8130-1984 with up to

date amendments. The standard conductor shall be clean and reasonably uniform in size

and shape and its surface shall be free from sharp edges. Not more than two joins shall be

allowed in any of the wires form and every complete length of conductor and no joint shall

be within 300 mm of any other joint in the same layer. Joints shall be blazed, silver soldered

or electric or gas welded. No joint shall be made in the conductor once, it has been

stranded.

6.2 CONDUCTOR SCREENING :

Conductor screening shall be non-metallic and shall consist of a layer of extruded-semi-

conducting cross linked polyethylene (XLPE) compound of thickness not less than 0.5mm.

6.3 INSULATION :

The insulation shall be chemically cross linked polyethylene (XLPE) applied by extrusion

conforming to IS : 7098 (Part-II) / 1985 and as required in the specification, Cross-linking

may be done by exposure to organize peroxide with nitrogen curing CCV line method with

the intention to ensure lowest free formation. Only natural unfilled compound shall be

used for insulation of cables. The average thickness of insulation when measured in

accordance with relevant clause of the specification shall not be less than the standard

thickness value specified. The smallest of the measured values of thickness shall not fall

below the standard thickness values as specified in IS : 7098 (Part-II) / 1985 by more than

0.1+0.1 standard thickness in mm. The thickness of insulation shall be as under:-

Sr. No. Nominal Area of Phase

Conductor (mm2)

Nominal Thickness

(mm)

Minimum Thickness

(mm)

1 50 3.6 3.14

2 95 3.6 3.14

3 120 3.6 3.14

4 150 3.6 3.14

6.4 INSULATION SCREENING :

The insulation screening shall consist of non-metallic semi-conducting part in combination

with a metallic part. Non- metallic part shall be applied directly over the insulation of each

core and shall consist of a layer of extruded semi-conducting compound. The minimum

thickness of non-metallic screening should be 0.6 mm.

6.5 METALLIC SCREENING :



The metallic part shall be applied over the individual core. Metallic screening shall consist of

copper tape sheath and shall be non-magnetic. The thickness of metallic screening should

not be less than 0.2mm.

6.6 OUTER SHEATH :

Over the metallic screen the cable shall be provided with extruded PVC outer sheath. The

composition of the PVC compound for outer sheath shall be Pre-Type ST2 of IS-5831-1984.

The colour of the outer sheath shall be grey. The average thickness of the sheath shall not

be less than the standard values specified in the IS when measured as laid in IS-7098

(Part-II)/ 1985. The smallest thickness of the measured values of sheath shall not fall below

the standard value (s) specified, by more than 0.2+0.2 (ts) mm.

6.7 CORE IDENTIFICATION :

The Core identification shall be done by providing coloured strip under Copper Tape.

7. MESSENGER WIRE :

The bare messenger wire shall be of 35mm2/70mm

2/150mm

2 (nominal area). Messenger wire,

shall consist of Aluminium alloy wires generally confirming to IS : 398 ( Part-IV)/ 1979and wire

shall be tested as per relevant IS. Strands shall be suitably compacted and have smooth round

surface to avoid damage to the outer insulating sheath of single-core phase cables twisted

around the messenger. There shall be no joints in any wire of the stranded messenger

conductor except those made in the base rod or wires before finally drawing.

8. LAYING UP :

Three Power Cores shall be twisted over bare messenger wire with right hand direction of lay.

This will form the Aerial Bunched Cable.

9. TESTS:

9.1 TYPE TESTS:-

The material offered, shall be fully type tested as per relevant standard of specification of

IS:7098 (Part-II/1985) amended up to date. The bidder must furnish type test reports of similar

rating & design of tendered material within 1 month of allotment of order. The following shall

constitute type tests:

a) Tests of Conductor:

i. Annealing test (for copper) not applicable

ii. Tensile test (for aluminium)

iii. Wrapping test (for aluminium)

iv. Resistance Test

b) Test on Messenger Conductor: (as per IS: 14255/1995)

i. Breaking load test for messenger conductor.

ii. Elongation test for messenger conductor.

iii. Conductor resistance test

c) Tests for thickness of insulation and sheath.

d) Physical tests for insulation:

i. Tensile strength and elongation at break.



ii. Ageing in air oven.

iii. Hot test.

iv. Shrinkage test.

v. Water absorption (gravimetric).

e) Physical test for outer sheath: (as per IS: 14255/1995)

i. Tensile strength and elongation at break.

ii. Melt Flow Index

iii. Vicat softening test.

iv. Carbon Black:

a) Contents.

b) Dispersion

v. Environmental Stress Cracking

f) Partial discharge test.

g) Bending test.

h) Dielectric power factor test:

a. As a function of voltage.

b. As a function of temperature.

c. Insulation resistance (volume resistivity test).

i) Insulation resistance (volume resistivity test)

j) Heating cycle test.

k) Impulse withstand test.

l) High voltage test.

m) Flammability test.

n) Any other test as per relevant IS.

9.2 ACCEPTANCE TESTS

i. a) Tensile test

ii. Wrapping test

iii. Conductor Resistance Test

iv. Test for thickness of insulation and sheath

v. Hot set test for insulation

vi Tensile strength and elongation at break test for insulation and sheath

vii Partial discharge test

viii High voltage test

ix Insulation resistance (volume resistivity test)

9.3 ROUTINE TESTS

i Conductor Resistance Test

ii Partial discharge test

iii High voltage test



The following tests shall be carried out on the bare messenger wire in accordance with

IS:398 (part –IV).

i Breaking load Test (on finished wire).

ii Elongation test

iii Resistance test

9.2 However, the PSPCL reserves the right to demand repetition of same or all the type tests in

presence of PSPCL’s representative.

9.3 The bidder must also clearly indicate various testing facilities available at their works for testing

the material as per relevant standards. In case of otherwise particulars of the place where such

testing is proposed to be conducted during the course of inspection shall be indicated .

10 INSPECTION (TEST BEFORE DISPATCH):

10.1 No material will be allowed to be dispatched without prior inspection and approval. In case,

inspection of the consignment is waived off by the PSPCL, the bidder will be required to

furnish the test certificate of the material, in triplicate for approval. The material

consumed/destroyed during testing will be to the account of the bidder. Inspection and

acceptance of any equipment/material under this specification by the purchaser shall not

relieve the supplier of his obligation of furnishing equipment in accordance with the

specification and shall not prevent subsequent rejection if the equipment/material is found

to be defective. The following Acceptance tests as per Clause No.18.2 of IS:7098

(Part.II)/1985 & IS: 14255/1995 shall be conducted in presence of the PSPCL 's authorized

representative / agency on each lot of offered cables:

i) Tensile Test (If applicable).

ii) Wrapping Test (If applicable).

iii) Conductor Resistance Test (Phase Conductor & Messenger).

iv) Breaking load test for messenger conductor.

v) Elongation test for messenger conductor.

vi) Test for thickness of insulation & sheath.

vii) Hot Set Test for XLPE Insulation.

viii) Tensile strength & elongation at break test for insulation and sheath.

ix) Carbon Black:

a. Contents.

b. Dispersion

x) Partial Discharge Test (for screened cables only).

xi) High voltage test and

xii) Insulation resistance (Volume resistivity) Test.

In addition to above following type tests shall also be considered as acceptance tests and shall be

conducted on any two samples drawn from the lot offered for pre-despatch inspection:-



i) Shrinkage Test For XLPE insulation

i) Shrinkage Test (For outer sheath as per IS: 5831/1984

with latest amendments/revision if any) ii) Heat shock Test

iii) Hot deformation Test

iv) Thermal Stability Test

v) Flammability Test

The lot shall be considered as passed if the test results of both the samples for above tests conform

to relevant clauses of IS.

The following shall constitute optional test:-

Bending test on complete cable:

The test shall be performed on a sample of complete cable. The sample shall be bent

around a test mandrel at room temperature for at least one complete turn. It shall then be

unwound and the process shall be repeated after turning the sample around its axis by 180

degrees.

The cycle of these operations shall then be repeated twice. The diameter of the mandrel

shall be: 10(D+d)

Where: D= actual diameter of the cable, for example, minimum circumscribing diameter in

mm ;

And d= actual diameter of the phase conductor in mm.

Requirement: No cracks visible to the naked eye are allowed.

10.2 ROUTINE TEST: - The following shall constitute routine tests. The tests shall be done as per

relevant ISS:

a) Conductor resistance test

b) Partial discharge test

c) High voltage test.

d) Messenger Resistance

11. SEQUENTIAL MARKING.

Supplier shall provide non erasable sequential marking on one core of AB Cable at every one

meter distance before assembly of different cores to form the cable. However, the length of



cable for acceptance shall be based on length of finished cable and not on the basis of

sequential marks. The cores shall be identified as per relevant IS.

12. PACKING & MARKING

The cable shall be supplied in suitable non-returnable wooden drums of suitable size in

standard lengths subject to a tolerance of +/-5%. The cable shall be wrapped with polythene under

wooden covering. Each meter length shall be embossed with the trade name of manufacturer, Size

in mm2, word ELECTRIC, Voltage rating, year of manufacture and the word “PSPCL CABLE”. The

wooden drums should be provided with cast iron bushing & painted form outside with suitable

paint of any colour. The drums should be such that the cable wound on the same is transported

without any damage. The cable shall be supplied in standard length of 1000 mtr./500 Mtr.

depending upon the size.

The ends of the cable shall be sealed by means of non-hygroscopic sealing material. In addition to

this each drum shall carry the following information either stenciled on flange or label attached to it.

a) Manufacturer’s name.

b) Trade mark, if any.

c) A reference to IS i.e. IS -7098 (Part-II)/1985.

d) Length of the cable on the drum & no. of lengths.

e) Position of outer end of cable

f) Voltage grade and type of the cable.

g) Colour of outer sheath.

h) Nominal cross-sectional area of the cable conductor.

i) Work order No. & Date.

j) Name and address of consignee.

k) Number of cores.

l) Gross weight of packed and net weight of the power cable.

m) Drum No. & its direction of rotation (with an arrow)

n) Year of manufacture.

o) Property of PSPCL

13. TOLERANCE

13.1 TOLERANCE ON PACKING

The standard drum length may have tolerance of + 5%.

13.2 NON-STANDARD LENGTH

Non-standard lengths not less than 50% of the standard length of cable to the extent of 5% of the

total ordered quantity (size wise) will be acceptable.

14. CHECKING OF LENGTHS/ WEIGHTS DURING INSPECTION

The bidder shall at his own cost provide the necessary arrangements for the purpose of physical

and accurate checking of lengths and weights of the cables in drum(s) at the time of inspection by

the Inspecting Officer of the PSPCL. Out of total quantity of drums offered for inspection, the

Inspecting Officer of the PSPCL shall carry out inspection as under:-



i) He will carry out 100% checking of all the drums offered for inspection by weight.

ii) For check measurement of length, minimum 5% drums of the offered lot shall be

considered subject to minimum of 2 numbers.

iii) The drums for length measurement shall be selected either by keeping in view the

maximum difference in weight as recorded on the drums/packing list and actually measured, or

at random. Normally half of drums to be checked for length/weight shall be selected at random

and the remaining half by difference in observed/declared weight method.

iv) Maximum shortage observed in length in any of the drums check measured shall be

applied on all the drums offered in a particular lot, by the Inspecting Officer and declared

quantity will be reduced accordingly. The verification of length to be done by the consignee; as

in para-13 above of this specification shall be over and above the results obtained in this

checking.

15. SCHEDULE OF GUARANTEED AND GUIDING TECHNICAL PARTICULARS:-

The bidders must supply the detailed guaranteed and other technical particulars as

detailed in Annexure. alongwith the tender.



ANNEXURE

SCHEDULE OF GUARANTEED PARTICULARS

GUARANTEED TECHNICL PARTICULARS FOR HT AERIAL BUNCHED CABLE WITH CROSS-LINKED POLYETHYLENE

(XLPE) INSULATION & BARE MESSENGER WIRE (FOR NEUTRAL & EARTHING)

Sr.

No.

Particulars HT Aerial Bunched Cables

Size (sq. mm.) 3Cx50+35 3Cx95+70 3Cx120+70 3Cx150+150

1 Maker's Name & Address

2. Rated Voltage

3 Phase conductor details

i) No. of Phase conductors

ii) Nominal cross-sectional area of each

conductor-mm2

iii) No. & Size of strands (mm) (Before

Stranding)

iv) Minimum tensile strength of each strand-

N/mm2

v) Diameter of compacted conductor along

with tolerance (mm).

vi) Approximate mass per phase (Kg/Km)

vii) Maximum DC resistance at 200 C

(Ohm/Km)

viii) Insulation thickness (mm)

ix) Standard to which this material conforms

4. Messenger (Neutral conductor)

i) Nominal sectional area of each conductor

in mm2

ii) No. & size of strands (mm) (Before

Stranding)

iii) Diameter of compact conductors along

with tolerance (in mm)

iv) Approx. mass (Kg/Km)

v) Minimum Tensile strength in KN

vi) Max. DC resistance at 200 C (Ohm/Km)

vii) Standard specification to which this

material conform

5. i) Insulation of phase conductor

a. Conductor Screening

Material

Nominal Thickness (in mm)

b. Insulation



Material


c. Insulation Screening

Material

Non Metallic

Metallic

Thickness

Non Metallic (Nominal) (in mm)

Metallic (Nominal) (in mm)

d. Sheathing of Core

Material

Colour


e. Identification of power cores

ii) Whether all properties as mentioned in

the technical Specifications are

guaranteed if not indicate deviations in

properties .

iii) Standared specification to which this

material shall conform

6. Finished cable (Complete bunched cable)

i) Overall diameter (approx.) in mm

ii) Total mass (approx.) in Kg/Km

7. Drum

i) Total weight of drum(Kg)

ii) Whether drum is wheel mounted

iii) Standard specification to which drum

shall conform

8. Standard length of each cable and its

tolerance(Mtrs.)

9 i) Total length of cable in a drum and its

tolerance(Mtrs.)

ii) Mass of finished cable in a drum and its

tolerance(Kg)

10. Whether material bears ISI certification

mark

11. Serial number of ISI license and its

validity

12. Max. Continuous current carrying

capacity (Amp.)

13 Max. Continuous conductor temperature

due to load



14 Embossing

15. Any other particulars

Note:- Notwithstanding any error and omission in GTP shall conform to PSPCL’s Technical

Specification/relevant ISS.



47. TECHNICAL SPECIFICATIONS FOR 11KV THREE CORE XLPE CABLES

1. SCOPE

This specification covers the design, manufacture, testing at manufacturer’s works, packing, supply and

delivery of ISI marked three core, 11KV, stranded Aluminum conductor, XLPE insulated, PVC sheathed,

screened, armoured cable suitable for earthed system manufactured with CCV (Dry Cure) OR SIOPLAS

Technology . The cable shall be used underground in distribution system.

2. STANDARD

The cable shall comply with IS: 7098(Part-II)/1985 (with latest amendments/revisions if any). The Aluminum

conductor shall be of H2 Grade as per IS: 8130/1984(with latest amendments/revisions if any). The XLPE

insulation shall conform to IS: 7098 (Part –2) /1985(with latest amendments /revisions if any) and PVC

sheathing will be of PVC compound conforming to the requirements of type ST-II of IS-5831/1984(with latest

amendments/revisions if any).

SIZE OF CABLE

Design, manufacture, testing at manufacturer’s works, packing ,supply and delivery of ISI marked, 11 KV,

Three Core, stranded Aluminum conductor, XLPE insulated, PVC sheathed, screened, armoured cable

manufactured with CCV/SIOPLAS technology (Dry Cure) and confirming to IS-7098(Part-2) /1985 & the

specification No.QQ-1241/2010 –11 /PO/C&S. The size are as under: -

MATERIALS

a. CONDUCTOR

The conductor shall be of stranded construction and of high conductivity H2 grade aluminum of plain wires,

conforming to flexibility class as mentioned in Table-2 of IS-8130/1984 (with latest amendments/ revisions if

any).

b. CONDUCTOR SCREENING

The cable shall be provided with conductor screening by applying non-metallic semi conducting tape or by

extrusion of semi conducting compound or combination of two as per IS-7098 (Part 2)/1985(with latest

amendments/ revisions if any).

c. INSULATION

The Aluminum conductor shall be insulated with cross-linked polyethylene insulating compound conforming

to relevant clause of IS-7098(Part-2)/1985 (with latest amendments/revisions .if any) in such a way that it fits

closely on the conductor screening and it shall be possible to remove it without damaging the conductor. The

conductor shall be insulated by CCV/SIOPLAS technology. The thickness of insulation shall not be less than

the nominal value as specified in relevant IS.

d. INSULATION SCREENING

The insulation screening shall consist of two parts, namely metallic and non-metallic part as specified in the

relevant clauses of IS: 7098 (Part-2)/1985 (with latest amendments/revisions if any).

e. FILLERS & INNER SHEATH

Fillers & inner sheath shall be of vulcanised or unvulcanised rubber or thermoplastic materials. These materials

shall not be harder than XLPE/PVC used for insulation & outer sheath respectively and these shall be so chosen

Sr. No. Size

1 3C x 35mm²

2 3C x 150mm²

3 3C x 300mm²



to be compatible with temperature rating of the cable and shall have no adverse effect on any other component

of the cable.

The inner sheath on the laid up cores shall be applied either by extrusion or by wrapping and the method

actually adopted should be clearly defined in the tender. It shall be ensured that the shape is as circular as

possible. Further it should be possible to remove inner sheath without damage to insulation. The thickness of

the inner sheath shall be as per the relevant clause of IS-7098 (Part-2)/1985 (with latest

amendments/revisions if any).

f. ARMOURING

The cables shall be armoured as per IS:7098 (Part-2) /1985 (with latest amendments/revision if any).

g. OUTER SHEATH

The cables shall be provided with outer sheath by Pressure Extrusion Process, of PVC compound confirming

to type ST-2 of IS-5831/1984 (with latest amendment/revisions if any). The colour of outer sheath shall be

grey & thickness will be as per provisions of relevant IS.

5. IMPULSE LEVEL

The impulse level shall be 75KVp ( to be certified by the manufacturer).

6. TESTS

a. ACCEPTANCE TESTS

All the acceptance tests as specified under relevant clause of IS-7098(Part-2)/1985(with latest

amendment/revision if any) shall be carried out by the inspecting officer on the samples drawn as per

sampling plan stated in IS, from the lot offered for pre-despatch inspection.

In addition to above following type tests shall also be considered as acceptance tests and shall be

conducted on any two samples drawn from the lot offered for pre-despatch inspection:-

i) Shrinkage Test For XLPE insulation

i) Shrinkage Test ) (For outer sheath as per IS: 5831/1984

ii) Heat shock Test ) with latest amendments/revision if any)

iii) Hot deformation Test )

iv) Thermal Stability Test )

v) Flammability Test )

The lot shall be considered as passed if the test results of both the samples for above tests conform to

relevant clauses of IS.

Measurement of Weights of Various Parts of Cables.

The number of samples to be taken for the measurement of weights of various parts ,as per GTPs, shall be

50 % of the total no. of samples

b. TYPE TESTS



The cables shall comply with Type Tests as classified under clause-18.1 of IS: 7098(Part-2)-1985 (with

latest amendments/revisions if any). Complete Type Tests Certificates from a Govt.

approved/Recognized Test House indicating the results of Type tests conducted, in respect of each size

of cable offered, should be sbmitted within 1 month of allotment of order to the respective office of

PSPCL. Type Tests should be conducted on the tendered item manufactured only at works from where

material is to be supplied. PSPCL, however , reserve its right to carryout the Type Tests wherever felt

necessary at bidder’s cost.

Complete Type Tests as per IS: 7098 (Part-2)-1985(with latest amendments/revisions if any. will

be conducted on one number sample in the first lot of each sizse (only one time for full ordered

quantity of each size) at the works of the manufacturer during pre-despatch inspection at the cost of

the bidder.

c. ROUTINE TESTS

The manufacturer shall carry out/conduct routine tests as specified in relevant IS on the cables

manufactured before pre-despatch inspection.

d. OTHER TESTS

Any other tests becoming necessary with the amendment in relevant IS or otherwise agreed

between the manufacturer/ bidder & PSPCL shall also be carried out without any extra financial burden

upon the PSPCL.

7. IDENTIFICATION

The word ‘PSPCL` and manufacturer’s trade mark or name, size in mm², voltage rating and word

‘ELECTRIC` in English shall be embossed on the outer sheath of the cable at regular intervals of not

more than 1.5 metres, as may be convenient. The cable should also be sequentially marked to display

the length at a distance not more than 1 m.

The cores shall be identified as per relevant IS.

8. PACKING & MARKING

8.1 PACKING

The cable is required to be supplied in standard lengths of 500 mtrs up to 70 mm² and 250 mtrs

for other sizes. The length shall be supplied in non-returnable standard wooden drums provided with

cast iron bushing painted form outside with suitable paint of any colour. The drums should be such that

the cable wound on the same is transported without any damage.

8.2 MARKING

The following particulars shall be specified clearly with indelible ink or paint on each drum :-

Length of drum

Name of manufacturer, Brand Name & Trade Mark

Gross weight of drum

Size of cable in mm²

No. of cores.

Type of cable and voltage rating

ISI certification mark

Cable code

No. of lengths in drum (if more than one)

Direction of rotation of drum



Year of manufacturing

9. TOLERANCE

9.1 TOLERANCE ON PACKING

The standard drum length may have tolerance of + 5%.

9.2 NON-STANDARD LENGTH

Non-standard lengths not less than 100 M each to the extent of 5% of the total ordered quantity (size

wise) will be acceptable.

10. INSPECTION

The material offered for supply will be inspected by a fully authorised representative of the PSPCL or an

outside Agency nominated by PSPCL within two weeks from the date of receipt of intimation regarding

readiness of the material . No material will be allowed to be despatched without prior inspection and

approval. In case, inspection of any consignment is waived off by the PSPCL /Agency, the bidder will be

required to furnish routine & acceptance test certificates in triplicate, of the same for approval. It will

be the responsibility of the bidder to make adequate arrangement for testing of material at their works.

All testing instruments and appliances duly calibrated from Govt. Recognised test house will be made

available and material consumed/ destroyed during testing will be to the account of the supplier. The

PSPCL has the right to have the tests carried out by independent test house/laboratory/agency

whenever there is a dispute regarding the quality of material, cost of which shall be borne by the

bidder.

The material shall be sealed with lead seals and lash wire to be provided by the manufacturer / bidder.

Random testing of material on receipt in the stores irrespective of fact whether or not it was inspected

before despatch, shall be carried out by PSPCL and in case of failure, entire lot shall be rejected at the

cost and risk of supplier.

10. SCHEDULE OF GURANTEED TECHNICAL PARTICULARS

Bidder / Bidder must supply the detailed guaranteed technical alongwith the tender

11. ISI MARK

The bidders must supply photocopy of valid ISI licence, indicating item for which it has been issued

(valid on original date of opening of tender) along with their tender failing which their price bid will not

be opened. The above license should preferably be valid during the validity of the offer also. In case, the

license is expiring within the validity period of the offer, it will be the responsibility of the bidder to get

the same re-validated from time to time.



48. TECHNICAL SPECIFICATION FOR LT AERIAL BUNCHED CABLES

1. SCOPE:

1.1 This specification covers the requirements of LT Ariel Bunched cross linked polyethylene insulated cables

with aluminium conductors twisted over a central bare/insulated aluminium alloy messenger wire for use as

overhead distribution feeders of the following sizes:

Sr. No. Size mm2

1 3Cx16+25

2 3Cx25+25

3 3Cx35+25

4 3Cx 50+35

5 3Cx 95+70

6 3Cx 120+70

1.2 The cables covered in this standard are suitable for use on three-phase ac (earthed or unearthed) system

for rated voltage up to and including 1100 V.

Note: The cables conforming to this standard may be operated continuously at a power frequency voltage to

percent higher than the rated voltage.

1.3 The cables covered in this standard are suitable for use where the combination of ambient temperature

and temperature rise due to load, including temperature on exposure to direct sunlight results in conductor

temperature not exceeding the following:

Type of Insulation Normal Continuous

Operation

Short Circuit Operation

Polyethylene 700 C 160

0 C

Cross linked Polyethylene 900 C 250

0 C

2 COMPOSITION OF THE CABLE

The composite cable shall comprise three single-core cables twisted around a bare/insulated

aluminium alloy messenger wire, which will carry the weight of the cable.

3. RATED VOLTAGE

The rated voltage of the cables shall be 1100 volts.

4. APLICABLE STANDARDS:

The following standards with latest amendments shall be applicable.

1. IS: 1596 1984: Polyethylene insulated cable 1100 volts

2. IS: 8130 - 1984: Conductors for insulated cables

3. IS: 6474 - 1984: Polyethylene insulation of cables.

4. IS: 398 - 1994: (Part IV) Aluminium alloy conductor.

5. IS: 398 1996: (part II) For ACSR conductor.



6. IS: 14255 1995: Arial Bunched Cable Specification

7. IS: 7098 (PI) 1988 with latest version.

5. TERMINOLOGY

For the purpose of this standard the following definition to those given in IS 1885 (Part 32): 1993 shall

apply.

6. TESTS:

6.1 Routine Tests

Tests made by the manufacturers on all finished cable lengths to Demonstrate the integrity of

the cables.

6.2 Type Tests

Tests required to be supplied within 1 month of allotment of order.

Note: These tests are of such a nature that after they have been made, they need not be

repeated unless changes are made in

the cable materials of design, which might change the performance characteristics.

6.3 Acceptance Tests

Tests carried out on samples taken from a lot for the purpose of acceptance of the lot.

6.4 Optional Tests

Special tests to be carried out, when required by agreement between the PSPCL and the

supplier.

6.5 Earthed System

All electric system, which fulfills any of the following conditions:

a) The neutral point or midpoint connection is earthed in such a manner that even fault

conditions, the maximum voltage that can between any conductor and earth docs not

exceed 80 percent of the nominal system voltage;

b) The neutral point or midpoint connection is not earthed but a protective device is installed

which automatically cuts out part of the system which accidentally becomes earthed; or

c) In case of ac system only, the neutral point is earthed through an ARC suppression coil with

arrangement for isolation within 1 hour of occurrence of the fault provided that total of

such periods in a year does not exceed 125 hours.

6.6 Unearthed System

An electric system which does not fulfill the requirements of earthed system (see 3.5 (a), (b),

(c).

MATERIALS

7. CONDUCTOR

7.1 The power/outer insulated neutral/street lighting conductors shall conform to flexibility class

2 of IS 8130: 1984.

7.2 The messenger (Neutral conductor) or otherwise shall be either stranded circular or

compacted circular type and shall have minimum 7 strands. The surface of the conductor shall

be smooth.



7.3 A protective barrier may be applied between the conductor and insulation, if required. Such

barrier, when used, shall be compatible with insulating material and suitable for the operating

temperature of the cable.

7.4 The size of street lighting conductor shall be (16 sq mm)

7.5 The size of messenger conductor and its breaking load shall be as under:

SIZE AND REQUIREMENTS OF MESSENGER CONDUCTOR

Sr.

No.

Nominal Cross

Sectional

Area of phase

conductor

Messenger Conductor

Nominal Cross

Sectional Area

Maximum de

Resistance at 20 O

C

Minimum

Breaking

Load

mm2

mm2 Ohm/km KN

1 16 25 1.38 7.0

2 25 25 1.38 7.0c

3 35 25 1.38 7.0

4 50 35 0.986 9.8

5 70 50 0.689 14.0

6 95 70 0.492 19.7

7 120 70 0.492 19.7

7.6 There shall be no joints in any wire of the messenger conductor. The direction of outer layer

of wires in messenger conductors shall be right hand.

7.7 CORE IDENTIFICATION:

The phase conductors shall be provided with one, two or three 'ridges' and Outer neutral

insulated conductor, if provided, shall have four 'ridges' as shown in Fig. I for quick

identification. The street lighting conductor and messenger conductor (if insulated) shall not

have any identification mark.

Identification by other means, as agreed between the supplier and PSPCL, is also permissible.

7.8 ASSEMBLY (LAYING UP):

Three insulated phase conductors, one insulated neutral conductor (if required) and a street

lighting conductor (if required) shall be twisted around the bare (or insulated) as required

messenger conductor without fillers with a lay not exceeding 35 times the diameter of the

insulated phase conductor.

The direction of lay shall be right hand.

PHASE CONDUCTOR & NEUTRAL CONDUCTOR

Phase Conductors



Neutral Conductor

Fig. 1, Core Identification

7.9 Phase/Street Lighting Conductor

The conductor shall be of H2 or H4 grade aluminium complying with the Requirements of IS

8130: 1984.

PHASE CONDUCTOR

1. The phase conductor and street lighting conductors shall be insulate with black weather

resistant, polyethylene suitable for1100 v insulation, the insulated Conductors shall

generally confirm to the standards, applicable standards.

2. The phase conductors shall be suitable compacted and the outer diameter shall be within

the limits specified.

3. The phase conductors shall be provided with one, two and three 'ridges' for quick

identification.

4. The tensile strength of aluminium wire used in the conductors shall not be less the 90 N/

sqmm.

5. The standard sizes and technical characteristics of the phase and street lighting conductors

shall be as shown as under:

Nominal

sectional

area (mm2)

No. of

strands

Dia. Of

compacted

Conductor (mm)

Approx.

mass

(Kg/km)

Max.D.C.

resistance NCE

at 20 OC

Insulation

Thickness

(mm)

16 1 4.4 42 1.91 1.0

25 7 5.8 65 1.20 1.0

35 7 6.8 95 0.868 1.0

50 7 7.9 127 0.641 1.2

70 12 9.7 191 0.443

95 19 259 0.320

120 19 329 0.253

Note: The resistance value given in Col. 5 are the max, permissible Tolerance of +/- 5% is

allowable on diameters shown in col.3

7.10 Messenger (Neutral Conductor or Otherwise)



The conductor shall be of heat-treated aluminium magnesium-silicon alloy wires containing

approximate 0.5% magnesium and approximately 0.5% silicon conforming to IS 398 (Part-4):

1979. Customers can opt for ACSR as messenger wire. Messenger wire can be either bare OR

insulated as per requirement.

1. The bare messenger wire shall be generally made of aluminium alloy wire/ACSR confirming

to IS: 398 (Part IV) 1994/398 (Part-II) 1996 with latest amendment composed of 7 strands

and shall be suitably competed to have smooth surface to avoid damage to the

polyethylene insulation of the phase conductors twisted around the messenger.

2. There shall be no joints in any wire of the stranded messenger conductor and other

technical characteristics of the messenger wire (bare) shall be given as under:

Normal

Sectional

area

No. of

strands

Dia (min)

of

compacted

cond. (mm)

Approx.

Mass

(kg/km)

Max.

D.C.

resistance

NCE at 20%

ohm /km

Min. Tensile

Strength (KN)

25 7 5.8 65 1.380 7.4

35 7 6.8 95 0.986 10.3

50 7 7.9 127 0.689 14.7

70 12 9.7 191 0.492 20.6

Note: While the limiting values in col.5 & 6 are to be guaranteed and 5% plus tolerance will be

permissible on values in col.3.

The number of the insulated Phase Conductor in an ABC cable will vary depending on the

specifications and requirement of customer. Whereas, the ABC Cable with a single Insulated

conductor is called Duplex, the one with two insulated Conductors is called Triplex, and the

one with three insulated Conductors is called Quadruple. In addition to this, a street lighting

or an emergency service conductor may also be provided public amenities such as street

lighting.

COMPOSITION AND DESIGNATION OF FINISHED CABLES

7.11 The composition and designation of finished cables are given as under.

Sr. no. Designation Complete Bunched

Cables overall Dia in

mm

Total Mass approx in

Kg/km

1 3X16+25 19 250

2 3X16+16+25 19 310

3 3X25+25 22 330

4 3X25+16+25 22 390



5 3X35+25 24 430

6 3X35+16+25 24 490

7 3X50+35 32 580

8 3X50+16+35 32 640

Note: The first part of the designation refers to the number and size of the phase conductor,

the middle to the street lighting conductor(were provided) and the last to the bare

messenger wire. The sixes shown are the nominal sectional areas.

1. Polyethylene insulation will generally confirming to IS1596 1984 and IS-6474-1984 and XLPE

insulation confirming IS 7098 (P.I)/ IS 14255.

2. Cable Phase or street Lightening will confirm to IS-8130/1984 duly compacted.

3. The messenger (neutral conductor) will generally confirm to IS-398 (Part 4) 1994/ IS 398

Part II /1996 for Aluminium Alloy Conductors or ACSR Conductors duly compacted.

8. INSULATION:

8.1 The insulation shall be either of cross-liked polyethylene compound or of polyethylene

insulation applied by extrusion. Confirming to requirement given in Tables 1 and 2

respectively.

Sr. No.

(1)

Tests

(2)

Requirements

(3)

1 Tensile strength 12.5 N/ mm2,Min

2 Elongation at break 200 percent, Min

3 Ageing in air oven:

a) Treatment: Temperature

Duration

b) Tensile strength variation

c) Elongation variation

135 oC, +/- 3

oC

7 days

25 percent, Max

25 percent, Max

4 Hot set:


Time under load

Mechanical Stress

b) Elongation under load

c) Permanent elongation (set) after cooling

200 o

C, +/- 3oC

15 Min

20 N/cm2

175 percent, Max

15 percent, Max

5 Shrinkage:


Duration

130 o

C,+/- 3oC

1 hour



b) Shrinkage: 4 percent, Max

6 Water absorption (Gravimetric):


Duration

b) Water absorbed

85 oC,+/- 2

oC

14 days

1 mg/cm2, Max

7 Volume resistively:

a) at 27 o

C

b) at 90 o

C

1X1013ohm-cm, Min

1X1011ohm-cm, Min

PROPERTIES OF PE INSULATION

(CLAUSE 5.1)

Sr.No. Property Requirements

1 Volume /resistively:

a) at 27 o

C

b) at 70 o

C

1 X 1014 ohm-cm, Min

1 X 1012 ohm-cm, Min

2 Tensile Strength 10 N/mm2, Min

3 Elongation at break 300 percent Min

4 Melt flow index 3, Max

5 Vacant softening point 85 o

C,Min

6 Carbon black:

a) Content

b) Dispersion

Under consideration

7 Environmental stress cracking No cracks shall be visible to

marked eye

The conductor (with protective barrier, wherever applied) shall be provided with cross-linked

polyethylene or polyethylene insulation applied by extrusion.

Thickness of Insulation This average thickness of insulation shall be not less than the nominal value (t)

specified as under.

THICKNESS OF INSULATION

Nominal Area of Conductor Nominal Thickness (ti)

(mm2) (mm)

16 1.2

25 1.2

35 1.2



50 1.5

70 1.5

95 1.5

Tolerance on Thickness of Insulation

The smallest of measured values of thickness of insulation shall not fall below the nominal value (ti)

specified above by more than 0.1 mm + 0.1 (ti).

Application of Insulation

The insulation shall be so applied that it this closely on the conductor (or barrier, if any) and it shall be

possible to remove it without damaging the conductor.

The color of insulation shall be GREY.

POLYETHYLENE INSULATION

The Polyethylene insulation shall generally confirm to IS: 6474-1971.The following properties shall be

guaranteed:

Melt Flow Index: 0.5 or less

Yield Stress: Not less than 8n/mm2

Percentage Elongation: Not less than 350

Carbon Black Content: Between 2 &3

Vicat Softening Point: Not less than 850 C

Volume

At 270 C 1 X 10

15 Ohm Cm (min)

At 700 C : 1 X 1013 Ohm Cm (min)

9. CLASSIFICATION OF TESTS:

9.1 TYPE TESTS

THE FOLLOWING SHALL CONSITITUTE TYPE TEST

Sr.

No.

Tests Requirement Test method

(Ref to part IS

10801)

a. Tests on phase/street light conductor

i) Tensile test

ii) Wrapping test

iii) Resistance test

See IS 8130: 1984

See IS 8130: 1984

See IS 8130: 1984

2

3

b. Test on messenger conductor:

i) Breaking load

Section table 1

2



ii) Elongation test

iii) Resistance test

Sec 11.3

Sec Table 1

11.3

5

c. Physical tests for XLPE Insulation:

i) Tensile strength and elongation at

break

ii) Ageing in air oven

iii) Hot set test

iv) Shrinkage test

v) Water absorption (Gravimetric)

vi) Carbon Black:

1) Content:

2) Dispersion

See Table 2

See Table 2

See Table 2

See Table 2

See Table 2

Under Consideration

See Table 2

See Table 2

See Table 2

See Table 2

See Table 2

Under

Consideration

d. Physical test for PE Insulation:

i) Tensile strength and elongation at

break

ii) Melt flow index

iii) Carbon black:

1) Content

2) Dispersion

iv) Vicat softening Point

v) Environmental stress cracking

See Table 3

See Table 3

See Table 3

See Table 3

See Table 3

See Table 3

7

23

32

Under

Consideration

22

2

e. Test for thickness insulation See Table 4 8

f. Insulation resistance (Volume

receptivity)

See Table 2 & 3 43

g. High voltage test See 6.2 45

9.2 Acceptance Test

The following shall constitute acceptance tests:

a) Tensile test (for phase/street light conductor).

b) Wrapping test (for phase/streetlight conductor).

c) Breaking load test for messenger conductor.

d) Elongation test for messenger conductor.

e) Conductor resistance test,

f) Test for thickness of insulation,

g) Tensile strength and elongation at break test.

i) Insulation resistance test, and

h) Hot set test for XLPE insulation,



j) High voltage test,

INSPECTION:

All tests and inspection shall be made at the place of manufacture unless otherwise especially agreed

upon by the manufacturer and PSPCL at the time of PSPCL at the time of purchase. The manufacturer

shall afford the inspector representing the PSPCL all reasonable facilities, without charge, to satisfy

him that the material is being furnished in accordance with this specification.

9.2.1 A probable sampling plan for acceptance tests is given in Annex”A”

ANNEX A

(Clause 9.2.1)

SAMPLING OF CABLES

A-1 LOT

A-1.1 In any consignment the cables of the same size manufactured under essentially similar

conditions of production shall be grouped together to constitute a lot.

A-2 SCALE OF SAMPLING

A-2.1 Sample shall be taken and tested from each lot for ascertaining the Conformity of the lot to the

requirements of the specification.

A-2.2 The number of drums (n) to be selected from the lot of drums (N) of Consignment of cable shall

be in accordance with col 2 and 1 of Table 5 respectively. These samples shall be taken at

random.

In order to ensure the randomness of selection, random number labels shall be used (see IS 4905:

1968 Methods of random sampling).

A-3 NUMBER OF TESTS AND CRITERION FOR CONFORMITY

A-3.1 Suitable length of test sample shall be taken from each of the drums selected. These test

samples shall be subjected to each of the acceptance to each of the acceptance tests (see

12.2) A. test sample is called defective if it fails in any of the acceptance tests.

If the number of defectives is less than or equal to the corresponding permissible number (a)

given in col 3 of following Table the lot shall be declared as conforming to the requirements of

acceptance test, otherwise not.

NUMBER OF DRUMS TO BE SELECTED FOR

SAMPLING AND PERMISSIBLE NUMBER OF DEFECTIVES.

Number of Drums in

The Lot

Number of Drums

to be Taken

as Sample

Permissible Number of

Defectives

N N a

Up to 50 2 0

51 to 100 5 0



101 to 300 13 0

301 to 500 20 1

501 and above 32 2

9.3 Routine Tests

The following shall constitute routine tests:

a) Conductor resistance test, and

b) High voltage test.

9.4 Optional Test

The following shall constitute optional test:

Bending test

10. DETAILS OF TEST:

10.1 General

Unless otherwise stated in this standard, the tests shall be carried out in accordance with

appropriate parts of IS 10810 taking into account additional information given in this standard.

10.2 High Voltage Test

High voltage at room temperature (Type, Acceptance and Routine Test): The cable shall

withstand a voltage of (3kvac (rms) at a frequency of 40 to 60 Hz or a dc voltage of 7.2 kV

between conductor for 5 minutes.

10.3 Elongation Test on Messenger Conductor

Test shall be carried out on wires before stranding. The specimen shall be straightened by

hand and an original gauge length of 200 mm shall be marked on the wire. A tensile load shall

be applied by means of a suitable tensile testing machine. The load shall be applied gradually

and the rate of separation of the jaws of the testing machine shall be not less than 25, per

minute and not greater than 100 mm per minute. The elongation shall be measured after the

fractured ends have been fitted together. If the fractured occurs outside the gauge marks, of

within 25 mm of either mark, or the required elongation is not obtained, the test shall be

disregarded and another test made. The elongation of the specimen shall be not less than 4

percent on a gauge length of 200 mm. The test shall be performed on a sample of complete

cable. The sample shall be bent around a test mandrel at room temperature for at least one

complete turn. It shall then be unwound and the process shall be repeated after turning the

sample around its axis by 180 degrees. The cycle of these operations shall then be repeated

twice. The diameter of the manderel shall be 10 (D + d) Where D = actual diameter of the

cable, for example, Minimum circumscribing diameter, mm; and

d = actual diameter of the phase conductor, mm.

Requirement: No cracks visible to the naked eye are allowed.

SECTIONS IDENTIFICATION, PACKING AND MARKING

11. IDENTIFICATION:

11.1 Manufactures, Identification



The manufacturer shall be identified throughout the length of the cable by means of a tape

bearing the manufacturers name or trademark and year of manufacture. In case the above

method cannot be employed, or if the PSPCL so desires, colour identification threads in

accordance with a scheme to be approved by the Bureau of Indian Standards (BIS) shall be

employed.

11.2 Cable Identification

Cables with cross-linked polyethylene insulation shall be identified throughout the length of

the cable by the legend 'XLPE 90' and year of manufacture by a printed tape. No identification

is required for polyethylene insulation.

NOTES:

1 Single tape bearing manufacturer's name or trademark and the cable identification, that is,

XLPE 90, if provided shall be acceptable against the requirement of 11.1 and 11.2.

2. Identification required in 11.1 and 11.2 shall be given on any one of the insulated conductor

of cables.

12. PACKING AND MARKING:

12.1 The cable shall be wound on a drum (see IS 10418: 1982) of suitable size and packed. The ends

of the cable shall be sealed by non-hygroscopic material.

12.2 The cable shall carry the following information either stenciled on the drum or contained in a

label attached to it:

a) Reference to this Indian Standard, for example, Ref IS14255:

b) Manufacturer's name or trade-mark:

c) Type of cable and voltage grade:

d) Nominal cross-sectional area of phase conductor:

e) Length of cable on the drum:

f) Number of lengths on the drum (if more than one):

g) Direction of rotation of drum (by means of an arrow):

h) Gross mass;

i) Country of manufacture; and

j) Year of manufacture.

12.2.1 The cable (drum or label) may also be marked with the Standard Mark.

Note: The use of the Standard Mark is governed by the provision of Bureau of Indian

Standards Act, 1986 and the Rules and Regulations made there under. The details of

conditions under which the license for the use of Standard Mark may be granted to

manufacturers of producers may be obtained from the Bureau of Indian Standards.

12.3 Standard Length:

The standard length of 500 with +5% and longer length shall be acceptable.

12.4 Non Standard Length:

Non Standard Length not less than 50% of the standard length shall be accepted to the extent

of 10% of the ordered quantity.



TECHNICAL PARTICULARS

LT Aerial Bunched Cable 1100 Volts (4 core). Reference standard: Generally to IS: 7098(1)88.

Sl

No.

Description 3x25

+

1x25

+

1x35

3x35

+

1x35

+

1x35

3x50

+

1x50

+

1x35

3x70

+

1x70

+

1x55

3x95

+

1x95

+

1x55

1.

1.1

1.2

Power/Neutral core:

Conductors

a) Nom. cross sectional area

(i) Power cores (mm2)

(ii) Neutral core (mm2)

b) Max. D.C. resistance of conductor at

200

C

(i) Power cores (Ohm/Km)

(ii) Neutral core (Ohm/Km)

c) Approx. diameter of Conductor

(i) Power cores (mm)

(ii) Neutral core (mm)

Insulation:

Minimum thickness:

(i) Power cores (mm)

(ii) Neutral core (mm)

25

25

1.20

1.20

6.2

6.2

0.9

0.9

35

35

0.868

0.868

7.3

7.3

0.9

0.9

50

50

0.641

0.641

8.35

8.35

1.0

1.0

70

70

0.443

0.443

10.1

10.1

1.1

1.1

95

95

0.320

0.320

12.0

12.0

1.1

1.1

2 Messenger Wire (Bare):

(i) Nom. cross sectional area (Sq. mm)

(ii) Approx. breaking load (KN)

35

41

35

41

35

41

55

62

55

62

3 Current ratings:

Continuous current carrying capacity of

cable in Air at Ambient temp. 400

C

(Amp.)

99

122

149

190

235

4 Approx. weight (kg./km.) 610 725 880 1270 1570

5 Number of cores:

(i) Power cores

(ii) Neutral core

(iii) Bare messenger

(No.) : 3

(No.) : 1

(No.) : 1



6 Derating factor:

Derating factors for variation In air Temp.

Air Tedmprature in (0C)

Rating factor

30 35 40 45 50 55

1.12 1.06 1.0 0.94 0.88 0.83

7 (a) Identification of Power core:

(b) Laying

By providing ridges on the insulation Three power cores

and one neutral core shall be suitably twisted around

bare H.T. Steel Messenger. /AAAC.

8 Details of the Power/Neutral core:

(i) Conductor:

(a) Material

(b) Flexibility class as per IS: 8130/84

(c) Form of conductor

(ii) Insulation:

(a) Material

(b) Colour of Insulation

Aluminium to IS: 8130/84

Class-2

Compacted circular

Cross linked Polyethylene to IS: 7098(I)88

Black

9 Details of the Messenger wire (Bare)

(i) Material

(ii) Form of conductor

ACSR/AAAC. Conductor to IS: 398 (II) & (IV) respectively

Stranded circular/compacted circular.




LT Aerial Bunched Cable 1100 Volts (5 core) with Street Lighting Conductor. Reference Standard: Generally

to IS: 6474-71

Sl

No.

Description 3x16

+

1x16

+

1x25

3x25

+

1x16

+

1x25

3x35

+

1x16

+

1x25

3x50

+

1x16

+

1x35

3x70

+

1x16

+

1x50

3x95

+

1x16

+

1x70

3x120

+

1x16

+

1x70

1.

1.1

1.2

Power/Neutral core:

Conductors


(i) Phase conductor (mm2)

(ii) Street lighting conductor (mm2)

b) Max. D.C. resistance of conductor at

200

C

(i) Phase conductor (Ohm/Km)

(ii) Street lighting conductor (Ohm/Km)


(i) Phase conductor (mm)

(ii) Street lighting conductor (mm)

Insulation:

Minimum thickness:


(ii) Street lighting conductor (mm)

16

16

1.91

1.91

6.2

6.2

1.0

1.0

25

16

1.20

1.91

6.2

6.2

1.0

1.0

35

16

0.868

1.91

7.3

7.3

1.0

1.0

50

16

0.641

1.91

8.35

8.35

1.2

1.0

70

16

0.443

1.91

10.1

10.1

1.4

1.0

95

16

0.320

1.91

12.0

12.0

1.4

1.0

120

16

0.253

1.91

12.0

12.0

1.6

1.0




25

7.4

25

7.4

25

7.4

35

10.3

50

14.7

70

20.6

70

20.6

3 Current ratings:

Continuous current carrying capacity of

cable in Air at Ambient temp. 400

C

(Amp.)

51

70

86

105

130

155

180

4 Approx. weight (kg./km.) 310 390 490 640 890 1180 1430

5 Number of cores:

(i) Power cores

(ii) street lighting core

(iii) Bare messenger

(No.) : 3

(No.) : 1

(No.) : 1



6 De-rating factor:

De-rating factors for variation In air

Temp. Air Temperature in (0C)

Rating factor

30 35 40 45 50 55

1.12 1.06 1.0 0.94 0.88 0.83


(b) Laying

By providing ridges on the insulation Three power cores

and one neutral core shall be suitably twisted around bare

H.T. Steel Messenger. /AAAC.


(i) Conductor:

(a) Material



(ii) Insulation:

(a) Material



Class-2

Compacted circular


Black


(i) Material


ACSR/AAAC. Conductor to IS: 398 (IV) respectively





LT Aerial Bunched Cable 1100 Volts (4 core). Reference standard: Generally to IS: 6474-71.

Sl

No.

Description 3x16

+

1x25

3x25

+

1x25

3x35

+

1x25

3x50

+

1x35

1.

1.1

1.2

Power/Neutral core:

Conductors


(i) Phase conductor (mm2)

(ii) Neutral conductor (mm2)

b) Max. D.C. resistance of conductor at 200

C

(i) Phase conductor (Ohm/Km)

(ii) Neutral conductor (Ohm/Km)



(ii) Neutral conductor (mm)

Insulation:

Minimum thickness:


16

25

1.91

1.38

4.4

5.8

1.0

25

25

1.20

1.38

5.5

5.8

1.0

35

25

0.868

1.38

6.8

5.8

1.0

50

35

0.641

0.968

7.9

6.8

1.2




25

7.4

25

7.4

25

7.4

35

10.3

3 Current ratings:

Continuous current carrying capacity of cable in Air

at Ambient temp. 400

C (Amp.)

60

76

92

110

4 Approx. weight (kg./km.) 250 330 430 580

5 Number of cores:

(i) Power cores

(ii) Neutral messenger core

(No.) : 3

(No.) : 1

6 De-rating factor:

De-rating factors for variation In air Temp. Air

Temperature in (0C)

Rating factor

30 35 40 45 50 55

1.12 1.06 1.0 0.94 0.88 0.83




(b) Laying

By providing ridges on the insulation

Three power cores and one neutral core shall be

suitably twisted around bare AAAC Messenger.


(i) Conductor:

(a) Material



(ii) Insulation:

(a) Material



Class-2

Compacted circular


Black


(i) Material


ACSR/AAAC. Conductor to IS: 398 (IV)

respectively


FINISHED AERIAL BUNCHED CABLE TESTING

Prior to dispatch, cable is subjected to rigorous testing. Test procedures followed at manufacturer’s works are

according to various national & International specifications and are covered in this paper.

Following tests are performed on Aerial Bunched Cables:-

1. Test on Phase/Street lighting conductor

TESTS METHOD OF TESTING

a) Tensile test IS: 10810 pt - 2

b) Wrapping test IS: 10810 pt - 3

c) Conductor Resistant Test IS: 10810 pt - 5

d) Test for thickness of insulation IS: 10810 pt - 6

e) Physical test for polyethylene insulation

(i) Tensile strength & Elong. Test IS: 10810 pt - 7

(ii) Melt flow Index IS: 10810 pt - 23

(iii) Vicat softening Point IS: 10810 pt - 22

(iv) Carbon Black Content & dispersion IS: 10810 pt - 32

(v) Colour factness IS: 10810 pt - 18

(vi) Environmental stress cracking IS: 10810 pt - 29

(vii) Bleeding & Blooming IS: 10810 pt - 19

(viii) Volume Resistivity test IS: 10810 pt - 43

(f) High Voltage test including water immersion test. IS: 1596

2. Test for messenger conductor: -

(a) Breaking load test IS: 398 (pt-IV)

(b) Elongation test IS: 398 (pt-IV)

(c) Resistance test IS: 398 (pt-IV)



3. Dimensional test as per the parameters specified in the technical particulars.

4. Bending test on completed cable shall also as performed. The diameter of mandrel shall be 10 (D+d),

Where D = Overall diameter of the cable

d = Dia over conductor



49. TECHNICAL SPECIFICATION FOR LT & HT AB (ARIAL

BUNCHED) CABLE ACCESSORIES

CONNECTORS AND FITTINGS (C&F)

1. LOW VOLTAGE AERIAL BUNDLED CABLE (LTABC)& HIGH VOLTAGE AERIAL BUNDLED CABLE

ACCESSORIES

Scope

This specification covers the design, manufacture and testing of Accessories for Low Voltage Aerial

Bundled Conductor (LT ABC) with Bare/ insulated Messenger & Service cables.

1. General conditions

2. Standard References

3. Technical Specifications of ABC Accessories

a. Dead End Clamps (DEC)

b. Suspension Clamps (SC)

c. Service Anchoring Clamps (SAC)

d. Insulation Piercing Connectors (IPC)

e. Distribution Box (DB)

f. Hardware: Eye Hooks & Pole Clamps

1. General Conditions

The products shall be in accordance with Indian standards and most of the European recognised

standards used in LT ABC (NFC for example) or with any relevant standard.

• Marking: Each product shall be clearly identified with Manufacturer name or trade mark, reference

and capacity of the item and batch No.

• Packaging: Manufacturer shall mention the packaging of each item. Installation instruction should be

included in the packaging.

• Type tests: Each supplier should provide type test reports with, carried out in accordance with one of

the referenced standards in NABL or any govt test house / accredited laboratory.

• Routine tests: Suppliers shall provide a control plan, which will be implemented on each item. Routine

Test reports should be submitted by the manufacturer with the Inspection Call.

• Anchoring and Suspension clamps should be installable on existing poles using appropriate devices

(hooks, brackets etc.)

• All crimped connectors should be installed with mechanical or hydraulic hand crimping tools.

2. Standard References

i) REC Construction Standard E-34: For Suspension Clamp & Eye Hook

ii) REC Construction Standard E-35: For Dead End Clamp & Eye Hook



iii) REC Construction Standard E-36: For LT Cable Tapping Connections

iv) NFC 33-040:1998 "Suspension Equipments for Overhead distribution with Bundle assembled

cores, of rated voltage 0,6/1 kV

v) NFC 33-041:1998 "Anchoring devices for Overhead Distribution with bundle assembled cores,

of rated voltage 0,6/1 kV"

vi) NFC 33-042:1998 "Service Anchoring devices for overhead and underground services with

insulated cables, of rated voltage 0,6/1 kV"

vii) NFC 33-020:1998 "Insulation piercing connectors for overhead distributions and services with

bundle assembled cores, of rated voltage 0,6/1 kV".

viii) NFC 33-021:1998 "Pre-insulated compression type connecting equipment for Overhead

Distributions and Services with bundle assembled cores, of rated voltage 0.6/1 kV"

ix) NFC 33-004:1998 "Electrical ageing test"

x) NFC 33-003:1998 "Corrosion test"

xi) NFC 20-540:1998 "Climatic ageing test"

3. Technical Specifications of ABC Accessories

a) Dead End Clamp for Bare / Insulated Messenger (DEC)

The clamps should be designed to Anchor Bare / Insulator Messenger of LT ABC. The clamp

should consist of an Aluminium alloy corrosion resistant body with bolted / self-adjusting

plastic wedges clamping.

• The clamp should be installed properly with no losable part.

• The clamp should not damage the conductor/ insulation of conductor

• For insulated messenger, it shall conform to the standard NFC 33-041 or equivalent I.S., if

any.

• The clamp body should be made of corrosion resistant Aluminium alloy.

• It should be fixed with pole by eye hook / bracket.

• Ultimate Tensile Strength of the clamp should not be less than 15 KN for 25-70 sq.mm

messenger wire.

• Slip load of the clamp should not be less than 5KN for 50/70 sq.mm bare messenger & 3KN

for 25/35 sq.mm bare messenger wire.

• Detailed design/ drawing to be furnished by the bidder / manufacturer. REC construction

standard drawing mentioned below are indicative drawing, may be followed.



b) Suspension clamp for Bare / Insulator neutral messenger(SC)

The clamp should be designed to hang LT-ABC with bare / insulated neutral messengers. The

neutral messengers should be fixed by an adjustable grip device /1 or 2 bolted.

• The suspension clamp range to accommodate messenger shall be 25-70mm2 and shall be as per similar design of REC E-34.

• For insulated messenger, it shall conform to the standard NFC 33-040 or equivalent I.S., if any. • The clamp shall be made up of Aluminium Alloy. • Clamps should be fixed with pole by eye hook/bracket. The Suspension Clamp & the eye

hook/bracket will be preferably delivered together in order to minimize abrasion between two materials.

• Ultimate Tensile Strength of the clamp should not be less than 12 KN for 25-70 sq.mm bare / insulated messenger wire.

• Slip load of the clamp should not be less than 300N for 25-70 sq.mm bare messenger wire

• The clamp should sustain to maximum angle of deviation of 60 degrees of the conductors.

• Detailed design/ drawing to be furnished by the bidder/manufacturer. REC construction standard drawing mentioned below are indicative drawing, may be followed.



c) Service Anchoring Clamp (SAC)

The clamps should be designed to anchor insulated service lines (armoured or un-

armoured) with 2/4 conductors.

• The clamps should be made of weather and UV resistant polymer & should be of wedge /

bolted type design.

• The clamp should be installed properly.

• No losable parts & should have a rigid bail.

• The clamp shall conform to the standard NFC33-042 or equivalent I.S., if any.

• Breaking load of the clamp should not be less than 1 KN.

• Detailed design/ drawing to be furnished by the bidder/manufacturer.

• Reference standard: NFC 33 021 or equivalent I.S., if any.

• Detailed design/ drawing to be furnished by the bidder/manufacturer.



d) Insulation Piercing Connectors (IPC)

Scope For proper method of providing service connection from AB Cables to our consumers without damaging the cable, the Insulating Piercing Connectors are required

a) for providing 1-2 service connections from 8 / 9 mtr. PCC LT pole,

b) for providing supply to Junction/ Distribution Box from AB Cable

c) for establishing Tee connection from LT ABC to LT ABC.

It must have Shear Head type mechanism to control the effective Torque during

connection and to ensure perfect installation. Connectors should not have any

losable parts, which may drop and then lost while installation at overhead

conditions. Torque required for Proper Installation should be mentioned on IPC,

should be 10-12 N-m.

Standards As per NF C 33-020 & NFC33-003, or equivalent I.S., if any.

Construction: The connectors should be totally insulated with no loose parts. The connectors

should be totally Weather & Moisture proof so that no water or moisture can

enter through the pierced holes on the cable insulation.

The maximum voltage withstand capacity should be 6 KV.

Moisture

Ingress:

The connectors should work at 30 cm under water bath for 30 min. & voltage

applied of 6KV for 1 min in underwater condition. No flashover/ failure should

occur during voltage application.

Working

Temp.:

Designed for installation from -10˚C upto +60˚C & operation experience with

temperature from -20˚C upto +75˚C.

Materials: Material used in the manufacturing process of the components of this product

should be specified in the respective product drawings & can be summarized as

follows:

• All the metallic part of the connector should be Corrosion resistance & should be proven in Corrosion Test.

• The contact plates should be made of tinned Copper / Aluminium Alloy as per IPC current rating.

• Connector teeth should be factory greased & sealed to retard water or moisture ingress & corrosion.

• The insulation material should be made of weather & UV resistance, reinforced polymer.

• The outer metallic part should have potential free tightening bolts to allow safe Live-Line installation.

• The bolts should be of Metallic Shear Head type so that it controls the effective applied Torque during installation & break off at a specified torque after establishing proper connection.

• The connector should not have any losable component. The cable end cap should be attached to the body.

• Should have attached flexible end caps without Grease in order to seal the open end of tap cable or in-built type. The end of tap should be felt from outside end cap, to ensure proper installation.

• Should be designed with encapsulated bolt heads or round head in order to avoid damaging other conductor insulation during installation.



• Should have an anti rotation device which ensures that the tap blades will not turn in front of main blades mainly in case of service application.

Testing

The Insulating Piercing Connector should conform to following std.- As per NF C 33-020, NFC33-003 & NFC33-004, or equivalent I.S., if any.

1. Corrosion Qualification Test

2. Electrical Ageing Test

3. Underwater High Voltage Test

4. Mechanical Tests

5. Voltage Test

11kv cables

Documents