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Continuous Current rating Three Core Dimensional Details Single Core Dimensional Details

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Continuous Current Rat ing for Single/ Three Core Cableswith Aluminium / Copper Conductor

Aluminium

Copper

NominalCross

SectionalArea of

Conductor

Continuous Current Rating forThree Core Cable

Continuous Current Rating forSingle Core Cable

(Single End bonding)

When Laid inGround

When Laid inAir

When Laid inGround

When Laid inAir

Sq.mm. amps amps amps amps

35115 125 115 140

145 165 150 180

50130 150 140 170

170 195 175 215

70160 190 170 210

210 240 215 270

95190 230 200 255

250 295 260 325

120220 260 230 295

280 335 295 375

150 245 295 255 335310 380 320 425

185275 335 290 385

350 430 370 495

240315 395 330 455

400 500 425 580

300355 450 375 520

450 570 475 670

400400 520 425 610

500 650 540 760

500455 600 485 720

550 740 600 900

630-- -- 550 830

-- -- 670 1010

800-- -- 620 950

-- -- 730 1140

1000-- -- 670 1070

-- -- 790 1250

Ambient Air Temperature: 400 C

Ground temperature : 300 C

Thermal Resistivity of Soil : 1500 C cm/ w

Maximum Continuous Conductor tempera ture : 900 CSingle Core Cable laid in TrefoilThree Core Cable laid SinglyMaximum Conductor Temperature

after Short Circuit : 250

0

C

Depth of Laying

3.3 kv to 11 kv Above 11 kv

900 mm 1050 mm

Tips:3.Key Manufacturing P rocess in HT Cable

Manufacturing.

XLPE Screenings and Insulation by Extrusion

Conductors made through stranding process aresubjected to this operation to form cores. Theprocess requires three extrusion operations, whichare done simultaneously using three extruders buta common head.

The core consists of three concentric layers o fextruded material. The first is a layer of black semi

conducting compound formed over the strandedcompacted conductor using the first extruder. Juston top of this a layer of white insulation compoundis extruded to form the second layer and finallythrough another extruder a layer o f black semiconducting compound is extruded over insulationlayer. The semi conducting layer formed overconductor is called conductor screen and the oneover insulation is called insulation screen. The threelayers i.e .conductor screen, insulation andinsulation screen are formed through a commonhead known as triple head.

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PVC pow er cables with aluminium conductors

1.1kv Power Cables(Un Armoured)

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Go to product category Constructional details aluminium

Pvc pow er cables w ith aluminum conductors (unarmourded cables)

Sr.no

Nominal

conductor

area sq.mm.

Minimum

nos.of w ires in

conductor

Nominal

thickness of

insulation in

mm

Minimum thickness

of innersheath in

mm

Nominal thickneness of

outer sheath in mm

Approximate overall

diameter in mm

Approximate weight of

cable in kg/ kms.

Main

coreE

Half

coreM ain Neu tral M ain Neutral

Nos. of cores Nos. of cores Nos. of cores Nos. of cores

2 3 3.5 4 2 3 3.5 4 2 3 3.5 4 2 3 3.5 4

1 4 $ - 1 - 1 - 0.3 0.3 0.3 1.80 1.80 1.80 14.3 15.0 16.1 232 256 298

# 3 - 1 - 0.3 0.3 0.3 1.80 1.80 1.80 14.8 15.6 16.8 250 250 318

2 6 $ - 1 - 1 - 0.3 0.3 0.3 1.80 1.80 1.80 15.5 16.3 17.7 280 315 371

# 3 - 1 - 0.3 0.3 0.3 1.80 1.80 1.80 16.3 17.2 18.5 305 340 400

3 10 $ - 1 - 1 - 0.3 0.3 0.3 1.80 1.80 1.80 16.8 17.8 19.2 307 360 425

# 3 - 1 - 0.3 0.3 0.3 1.80 1.80 1.80 18.0 19.0 20.6 335 390 460

4 16 $ - 3 - 1 - 0.3 0.3 0.3 1.80 1.80 2.00 20.0 21.2 23.5 415 491 612

# - -

5 25 # - 3 1.2 0.3 0.3 0.3 2.00 2.00 2.00 24.1 25.5 28.0 592 732 848

6 25 @ 16 # 6 7 1.2 1.0 0.3 0.3 0.3 0.3 2.00 2.00 2.00 2.00 20.0 23.4 25.4 25.9 461 600 695 760

7 35 @ 16 # 6 7 1.2 1.0 0.3 0.3 0.3 0.3 2.00 2.00 2.00 2.00 21.5 25.3 27.5 28.2 552 725 825 920

8 50 @ 25 @ 6 6 1.4 1.2 0.3 0.3 0.3 0.4 2.00 2.00 2.00 2.20 23.9 28.5 31.2 33.0 700 928 1070 1250

9 70 @ 35 @ 12 6 1.4 1.2 0.3 0.4 0.4 0.4 2.00 2.20 2.20 2.20 26.7 32.0 34.8 35.8 871 1230 1415 1570

10 95 @ 50 @ 15 6 1.6 1.4 0.4 0.4 0.4 0.4 2.20 2.20 2.20 2.40 30.4 35.7 38.9 40.5 1180 1577 1818 2065

11 120 @ 70 @ 15 12 1.6 1.4 0.4 0.4 0.5 0.5 2.20 2.20 2.40 2.40 32.4 38.2 42.2 43.2 1384 1860 2262 2485

12 150 @ 70 @ 15 12 1.8 1.4 0.4 0.5 0.5 0.5 2.40 2.40 2.40 2.60 35.6 42.5 46.2 47.8 1688 2322 2642 3030

13 185 @ 95 @ 30 15 2.0 1.6 0.5 0.5 0.5 0.6 2.40 2.60 2.60 2.80 39.0 46.7 50.8 53.0 2066 2840 3270 3760

14 240 @ 120 @ 30 15 2.2 1.6 0.5 0.6 0.6 0.6 2.60 2.80 3.00 3.00 43.5 52.3 57.2 58.8 2605 3640 4225 4736

15 300 @ 150 @ 30 15 2.4 1.8 0.6 0.6 0.6 0.7 2.80 3.00 3.20 3.40 48.0 57.5 62.9 65.0 3222 4430 5135 5902

16 400 @ 185 @ 53 30 2.6 2.0 0.7 0.7 0.7 0.7 3.20 3.40 3.40 3.60 54.5 65.0 70.5 73.0 4165 5818 6515 7422

-Extruded Pvc Inner Sheath $ = Solid Circular Aluminium Conductor-Standard drum length for all sizes : 500mtrs. 5% # = Stranded Circular Alumimium Conductor

@ =Standard Sector Shaped Aluminum Conductor

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Control cables w ith stranded circular copper conductor Control cables with solid circular copper conductor

1.1kv Control Cables(Armoured)

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Go to product category NextControl cables wi th stranded circular copper conductor (armoured)

Sr.no.

No.of cores

and

conductor

area sq.mm.

Copper

conductor

minimum

no.of wires

Thickness of

insulation

(mm)

Thickness of innersheath

in mm

Armou r size in mm

& type Minimum

thickness o f

outer sheath

(mm)

Approximate

overall d iameter

(mm)

Approximate

weight of cables

(kg./ km)Extruded W rapped

Round

wireFlat strip

1 2 X 1.5 3 0.8 0.3 - 1.4 - 1.24 14.2 420

2 3 X 1.5 3 0.8 0.3 - 1.4 - 1.24 14.5 460

3 4 X 1.5 3 0.8 0.3 - 1.4 - 1.24 15.5 510

4 5 X 1.5 3 0.8 0.3 - 1.4 - 1.24 16.5 562

5 7 X 1.5 3 0.8 - 0.3 1.4 - 1.24 17.1 605

6 10 X 1.5 3 0.8 - 0.3 1.4 - 1.40 20.9 820

7 12 X 1.5 3 0.8 - 0.3 - 4 X 0.8 1.24 20.0 700

8 14 X 1.5 3 0.8 - 0.3 - 4 X 0.8 1.40 21.1 785

9 16 X 1.5 3 0.8 - 0.3 - 4 X 0.8 1.40 22.0 865

10 19 X 1.5 3 0.8 - 0.3 - 4 X 0.8 1.40 23.1 955

11 24 X 1.5 3 0.8 - 0.3 - 4 X 0.8 1.40 26.3 117512 27 X 1.5 3 0.8 - 0.3 - 4 X 0.8 1.40 27.0 1240

13 30 X 1.5 3 0.8 - 0.3 - 4 X 0.8 1.40 27.9 1340

14 37 X 1.5 3 0.8 - 0.3 - 4 X 0.8 1.40 29.7 1545

15 44 X 1.5 3 0.8 - 0.3 - 4 X 0.8 1.56 33.0 1840

16 52 X 1.5 3 0.8 - 0.4 - 4 X 0.8 1.56 35.0 2070

17 61 X 1.5 3 0.8 - 0.4 - 4 X 0.8 1.56 37.0 2340

Sr.no.

No.of cores

and conductor

area sq.mm.

Copper

conductor

minimum

no.of wires

Thickness of

insulation

(mm)

Thickness of innersheath

in mm

Armou r size in mm

& typeMinimum

thickness of

outer sheath

(mm)

Approximate

overall d iameter

(mm)

Approximate

weight of cables

(kg./km)Extruded W rapped Round

wireFlat strip

1 2 X 2.5 3 0.9 0.3 - 1.4 - 1.24 15.5 500

2 3 X 2.5 3 0.9 0.3 - 1.4 - 1.24 16.1 550

3 4 X 2.5 3 0.9 0.3 - 1.4 - 1.24 17.0 625

4 5 X 2.5 3 0.9 0.3 - 1.4 - 1.24 18.2 686

5 7 X 2.5 3 0.9 - 0.3 1.4 - 1.24 19.0 751

6 10 X 2.5 3 0.9 - 0.3 - 4 X 0.8 1.24 22.3 861

7 12 X 2.5 3 0.9 - 0.3 - 4 X 0.8 1.40 22.9 935

8 14 X 2.5 3 0.9 - 0.3 - 4 X 0.8 1.40 24.0 1030

9 16 X 2.5 3 0.9 - 0.3 - 4 X 0.8 1.40 25.0 1140

10 19 X 2.5 3 0.9 - 0.3 - 4 X 0.8 1.40 26.1 1270

11 24 X 2.5 3 0.9 - 0.3 - 4 X 0.8 1.40 30.1 1566

12 27 X 2.5 3 0.9 - 0.3 - 4 X 0.8 1.40 30.8 1675

13 30 X 2.5 3 0.9 - 0.3 - 4 X 0.8 1.40 32.3 1845

14 37 X 2.5 3 0.9 - 0.4 - 4 X 0.8 1.56 34.6 2170

15 44 X 2.5 3 0.9 - 0.4 - 4 X 0.8 1.56 38.5 2545

16 52 X 2.5 3 0.9 - 0.4 - 4 X 0.8 1.56 40.5 2860

17 61 X 2.5 3 0.9 - 0.4 - 4 X 0.8 1.56 42.5 3240

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Standard Operating Parameters Current Rating Short Circuit Rating Rating Factors

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Standard OperatingParameters

Maximum ConductorTemperature

70 C (85 C for HR Cable)

Thermal resistivity of soil 150 C.cm./w

Thermal resistivity of PVC 650 C.cm./w

Ground temperature 30 C

Ambient air temperature 40 C

Depth of laying in Cms (Cableslaid in ground)

75 cm

Type o f installation

Twin, Three & Multicore Cables Laid singly

Single core Cable3 Cores in close trefoilformation

Current Rating (ac) for Three Single Core 650/ 1100 VOLTSUnarmoured / Non- Magnetic Armoured Cables according to is : 1554(Part I) 1988

SR.NO.

NOMINALCROSS

SECTIONAL

AREA

(sq.mm.)

LAID DIRECT IN

GROUNDLAID IN DUCT LAID IN AIR

COPPER

(Amps)

ALUMINIUM

(Amps)

COPPER

(Amps)

ALUMINIUM

(Amps)

COPPER

(Amps)

ALUMINIUM

(Amps)

1 1.5 22 17 21 17 20 15

2 2.5 30 24 29 24 27 21

3 4 39 31 38 30 35 27

4 6 49 39 48 37 44 35

5 10 65 51 64 51 60 47

6 16 85 66 83 65 82 64

7 25 110 86 110 84 110 84

8 35 130 100 125 100 130 105

9 50 155 120 150 115 165 130

10 70 190 140 175 135 205 155

11 95 220 175 200 155 245 190

12 120 250 195 220 170 280 220

13 150 280 220 245 190 320 250

14 185 305 240 260 210 370 290

15 240 345 270 285 225 425 335

16 300 375 295 310 245 475 380

17 400 400 325 335 275 550 435

18 500 425 345 355 295 590 480

19 625 470 390 375 320 660 550

20 800 540 440 405 345 765 640

21 1000 600 490 435 370 860 720

Tips:

9.Follow ing care should be taken wh ilelaying the Cable Across Roads, Railway

Tracks or Water Pipe Lines :

Steel, Castlron, Plastics, Cement or earthenwareducts or cable ducting blocks should be usedwhere cables cross roads and railways tracks.

Spare ducts for future extension should beprovided & sealed at both ends.

Ensure smooth entry of cable without undue

bending.

The duct/pipe joints should be covered by collarsto prevent settlement in between pipes.

The diameter of the cable conduit or pipe or ductshould be atleast 1.5 times the outer diameterof cable. The pipe/duct should be mechanicallystrong enough to withstand forces due to heavytraffic when laid across road/railway tracks.

The cable entry and exit should be through bellmouth or padding.

The bending radii of steel or plastic ducts shouldnot be less than 1.5 m.

Single core cables should not be laid individually

in ducts, butall3 cables of the same systemshould be laid in one duct.

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Standard Operating Parameters Continuous Current RatingMaximum short circuit rating of conductor for a duration of one second Rating Factor

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Standard Operating Parameters PVC XLPE

Maximum conductor temperature for continuous operations ( C) 70 90

Ambient air temperature ( C) 40 40

Ground temperature ( C) 30 30

Thermal resistivity of soil ( C cm/watt) 150 150

Thermal resistivity ( C cm/w) 650 350

Depth of laying 75 cm 75cm

Cables are installed singly

Minimum bending radious ( for Multi core cables) times cable diameter. 12 12

Maximum conductor temperature During short circuit ( C) 160 250

Continuous current rating of 3 or 4 core cables armoured and unarmoured laid direct inthe ground or in air 1100 volts grade with Aluminium conductor.

3, 3.5 or 4 core cables toIS : 1554 (Pt.1)

(PVC)

3, 3.5 or 4 core cables toIS : 7098 (Pt. 1)

(XLPE)

Sizesq. mm.

When Laid inApprox.Voltage

drop

v/km/A

Sizesq. mm.

When Laid inApprox.Voltage

drop

v/km/A

Groundamps

Airamps

Groundamps

Airamps

25 76 70 2.50 25 94 96 2.68

35 92 86 1.80 35 114 117 1.95

50 110 105 1.30 50 133 142 1.44

70 135 130 0.94 70 164 179 0.99

95 165 155 0.68 95 196 221 0.78

120 185 180 0.55 120 223 257 0.58

150 210 205 0.46 150 249 292 0.47

185 235 240 0.37 185 282 337 0.40

240 275 280 0.30 240 327 400 0.31

300 305 315 0.27 300 368 455 0.26

400 335 375 0.22 400 418 511 0.22

Tips:6.Type of Tests conducted on Finished

Cables

Routine TestsRoutine tests are tests conducted on each andevery finished length o f a cable. Routine testsmean tests conducted on a cable to assess itssuitability during routine service condition.

Type TestsType tests consist of a number of testsconducted on a piece of cable (not on the entiredrum length) cut from a finished cable drumlength. The purpose of these tests is to confirmthe suitability of a cable against the type, whichhas been constructed for a particular application.The sample taken for type tests represents theentire lot of cable manufactured of a particulartype.

Acceptance TestsAcceptance tests also consist of a number oftests conducted on few pieces of cables drawnfrom a manufactured lot. These tests areconducted during client's witness of testprogramme on a manufactured lot in order todecide about the lotto be shipped for usage ornot.

Special Tests

Special tests are those tests which do not getcovered under routine o r type o r acceptancetests. Generally special tests are conducted toassess a particular property or a set ofproperties, which have been built in the cable toexhibit desired requirement during its operation.

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Single core Two core Three Core Three & Half Core Four Core

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Go to product category NextSINGLE CORE UNARMOURED CABLES - 1100 VOLTS ALUMINIU M CONDUCTOR WITH XLPE I NSULATION

NominalArea of

Conductor

Single Core unarmoured Cables

Deliverylength with

+/- 5%tolerance

StandardMax DC

resistanceat 20C

ACresistance

at

OperatingTemp90C

Nominal

Thicknessof

Insulation

Nominal

diameterof roundAlu. Wire

Approx.

Overalldiameterof cable

Approx

weight offinishedcables

sq.mm. mm. mm. mm. kg/ km meters ohms/ km ohms/ km

25 0.9 1.8 13.0 177 1000 1.2000 1.536

35 0.9 1.8 14.0 209 1000 0.8680 1.111

50 1.0 1.8 15.0 258 1000 0.6410 0.820

70 1.1 1.8 17.0 337 1000 0.4430 0.567

95 1.1 1.8 17.0 401 1000 0.3200 0.410

120 1.2 1.8 21.0 535 1000 0.2530 0.324

150 1.4 2.0 23.0 642 1000 0.2060 0.264

185 1.6 2.0 25.0 774 500 0.1640 0.210

240 1.7 2.0 27.0 968 500 0.1250 0.160

300 1.8 2.0 30.0 1162 500 0.1000 0.128

400 2.0 2.2 33.0 1491 500 0.0778 0.100

Conductor : Stranded Compacted Circular. ( Except 25 sq.mm. Stranded circular)

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TWO / THREE CORE UNARMOURED CABLES - 1100 VOLTS ALUMINIUM CONDUCTOR WITH XLPE I NSULATION

Nominal

Area of

Conductor

Nominal

Thickness

of

Insulation

Tw o core unarmoured Cable

(Shaped Cond.)

3 core unarmoured C able

(Shaped Cond.)Standard

Delivery

length

with

+/- 5 %

tolerance

Max DC

resistance

at 20C

AC

resistance

at

Operating

Temp

90C

Minimum

Thickness

of inner

sheath

Nominal

Thickness

of outer

sheath

Approx.

Overall

diameter

of cable

Approx

w eight

of

finished

cables

Minimum

Thickness

of inner

sheath

Nominal

Thickness

of outer

sheath

Approx.

Overall

diameter

of cable

Approx.

Weight

of

finished

cable

sq.mm. mm. mm. mm. mm. kg/ km mm. mm. mm. kg/ km meters ohms/ km ohms/ km

25 0.90 0.3 2.0 20.0 295 0.3 2.0 23.0 411 500 1.2000 1.536

35 0.90 0.3 2.0 22.0 377 0.3 2.0 25.0 525 500 0.8680 1.111

50 1.00 0.3 2.0 24.0 496 0.3 2.0 28.0 686 500 0.6410 0.820

70 1.10 0.3 2.0 27.0 669 0.4 2.2 32.0 983 500 0.4430 0.567

95 1.10 0.4 2.2 30.0 912 0.4 2.2 35.0 1253 500 0.3200 0.410

120 1.20 0.4 2.2 32.0 1167 0.4 2.2 37.0 1587 500 0.2530 0.324

150 1.40 0.4 2.2 36.0 1413 0.5 2.4 42.0 2001 500 0.2060 0.264

185 1.60 0.5 2.4 40.0 1786 0.5 2.6 46.0 2467 500 0.1640 0.210

240 1.70 0.5 2.6 44.0 2252 0.6 2.8 51.0 3163 500 0.1250 0.160

300 1.80 0.6 2.8 48.0 2784 0.6 3.0 56.0 3841 500 0.1000 0.128

400 2.00 0.6 3.0 54.0 3539 0.7 3.2 63.0 4948 500 0.0778 0.100

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Single core Two core Three Core Three & Half Core Four Core

LT-XLPE Armoured Cables

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Go to product category NextSINGLE CORE ARMOURED CABLES - 1100 VOLTS ALUMINUM CONDUCTOR WITH XLP E INSULATION

NominalArea of

Conductor

Hard drawn A luminium round wire ArmouredStandardDelivery

length with+/- 5 %

tolerance

Max DCresistanceat 20C

ACresistance

atOperating

Temp 90C

NominalThickness

ofInsulation

Nominaldiameter

of roundAlu. Wire

MinimumThickness

of outersheat

Approx.Overall

diameterof cable

Approx.Weight of

finishedcable

sq.mm. mm. mm mm. mm. kg/ km meters ohms/ km ohms/ km

25 1.2 1.4 1.24 14.5 259 1000 1.2000 1.536

35 1.2 1.4 1.24 15.0 295 1000 0.8680 1.111

50 1.3 1.4 1.24 17.0 354 1000 0.6410 0.820

70 1.4 1.4 1.24 18.0 445 1000 0.4430 0.567

95 1.4 1.6 1.40 19.0 544 1000 0.3200 0.410

120 1.5 1.6 1.40 23.0 694 1000 0.2530 0.324

150 1.7 1.6 1.40 25.0 817 1000 0.2060 0.264

185 1.9 1.6 1.40 26.0 965 500 0.1640 0.210

240 2.0 1.6 1.40 29.0 1188 500 0.1250 0.160

300 2.2 1.6 1.56 32.0 1428 500 0.1000 0.128

400 2.4 2.0 1.56 36.0 1844 500 0.0778 0.100

Conductor : Stranded Compacted Circular. (Except 25 sq. mm. Stranded circular)

TWO CORE ARMOURED CABLES - 1100 VOLTS ALUMINI UM CONDUCTOR W ITH XLP E INSULATION

Nominal

Area of

Conductor

Nominal

Thickness

of

Insulation

Minimum

Thickness

of inner

sheath

Flat galvenised steel strip Armo ured

( shaped cond)

Galvenised rou nd steel wire

Armoured ( shaped cond)Standard

Delivery

length

with

+/- 5 %

tolerance

Max DC

resistance

at 20C

AC

resistance

at

Operating

Temp

90C

Nominal

dimension

of flat

strip

Minimum

Thickness

of outer

sheat

Approx.

Overall

diameter

of cable

Approx

w eight

of

finished

cables

Nominal

diameter

of round

g.s.

Wire

Minimum

Thickness

of o uter

sheath

Approx.

Overall

diameter

of cable

Approx.

Weight

of

finished

cable

sq.mm. mm. mm mm. mm. mm. kg/ km mm. mm. mm. kg/ km meters ohms/ km ohms/ km

25 0.90 0.3 4 x 0.8 1.40 21.0 527 1.6 1.40 22.0 741 500 1.2000 1.536

35 0.90 0.3 4 x 0.8 1.40 22.0 633 1.6 1.40 24.0 866 500 0.8680 1.111

50 1.00 0.3 4 x 0.8 1.40 25.0 788 1.6 1.40 26.0 1050 500 0.6410 0.820

70 1.10 0.3 4 x 0.8 1.56 28.0 1024 1.6 1.56 29.0 1318 500 0.4430 0.567

95 1.10 0.4 4 x 0.8 1.56 31.0 1285 2.0 1.56 33.0 1822 500 0.3200 0.410

120 1.20 0.4 4 x 0.8 1.56 33.0 1574 2.0 1.56 35.0 2156 500 0.2530 0.324

150 1.40 0.4 4 x 0.8 1.72 37.0 1899 2.0 1.72 39.0 2546 500 0.2060 0.264

185 1.60 0.5 4 x 0.8 1.72 40.0 2295 2.0 1.88 43.0 3047 500 0.1640 0.210

240 1.70 0.5 4 x 0.8 1.88 44.0 2813 2.5 2.04 48.0 4031 500 0.1250 0.160

300 1.80 0.6 4 x 0.8 2.04 49.0 3402 2.5 2.20 52.0 4741 500 0.1000 0.128

400 2.00 0.6 4 x 0.8 2.36 55.0 4281 2.5 2.36 58.0 5738 500 0.0778 0.100

Extruded PVC inner sheath

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Conductor resistance and Short Circuit Carrying Capacity Group Rating Factor fo r Single and Multi Core CablesGroup Rating Factors for Single/Multicore Cables Rating Factor for Ambient Air/Ground Temperature variation

HT Common design details

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Go to product category NextConducto r Resistance and Short Circuit Current Carrying Capacity

NominalCross

SectionalArea

MaximumDC

Resistance

at 200 C

Approx.ACResistance

at 900 C

MaximumDC

Resistance

at 200 C

Approx.ACResistance

at 900 C

Short Circuit Currentfor Conductor

Aluminium Conductor Copper Conductor Aluminium Coppersq.mm ohms/ km ohms/ km ohms/ km ohms/ km ka/ sec ka/ sec

35 0.8680 1.137 0.5240 0.6864 3.29 5.01

50 0.6410 0.840 0.3870 0.5070 4.70 7.15

70 0.4430 0.580 0.2680 0.3511 6.58 10.01

95 0.3200 0.419 0.1930 0.2528 8.93 13.58

120 0.2530 0.331 0.1530 0.2004 11.28 17.16

150 0.2060 0.270 0.1240 0.1624 14.10 21.45

185 0.1640 0.215 0.0991 0.1298 17.39 26.46

240 0.1250 0.164 0.0754 0.0988 22.56 34.32

300 0.1000 0.131 0.0601 0.0787 28.20 42.90

400 0.0778 0.102 0.0470 0.0616 37.60 57.20

500 0.0605 0.079 0.0366 0.0479 47.00 71.50

630 0.0467 0.061 0.0283 0.0371 59.22 90.09

800 0.0367 0.048 0.0210 0.0280 75.20 114.40

1000 0.0292 0.038 0.0176 0.0231 94.00 143.00

Group Rating Facto r for Single and Mu lti Core Cables

Single Core

Multi Core

Number of Cablesin Group

Spacing between Cables in mm

Touching 150 200 300 400 450 600 800

20.76 0.81 0.83 0.85 0.87 0.88 0.90 0.92

0.79 0.82 0.86 0.87 0.88 0.89 0.92 0.94

30.64 0.72 0.72 0.77 0.79 0.81 0.83 0.86

0.67 0.73 0.77 0.78 0.80 0.82 0.86 0.89

40.58 0.65 0.67 0.72 0.75 0.76 0.80 0.84

0.61 0.68 0.72 0.74 0.79 0.80 0.83 0.87

50.53 0.61 0.63 0.68 0.71 0.73 0.77 0.81

0.56 0.63 0.68 0.70 0.76 0.77 0.81 0.85

60.50 0.56 0.60 0.66 0.69 0.72 0.76 0.80

0.53 0.60 0.65 0.68 0.74 0.76 0.80 0.84

SINGLE CORE:

A. Group Rating facto rs for Circuit of three Single core cables in Trefoils laiddirect in Ground in Horizontal formation.

MULTI CORE:

B. Group Rating factors for cables laid in Horizontal formation.

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Continuous Current rating Three Core Dimensional Details Single Core Dimensional Details

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Continuous Current Rating for Single/ Three Core Cableswith Aluminium / Copper Conductor

Aluminium

Copper

NominalCross

SectionalArea of

Conductor

Continuous Current Rating forThree Core Cable

Continuous Current Rating forSingle Core Cable

(Single End bonding)

When Laid inGround

When Laid inAir

When Laid inGround

When Laid inAir

Sq.mm. amps amps amps amps

35110 130 115 140

145 165 150 185

50130 155 135 170

170 200 175 225

70160 190 165 215

205 245 215 275

95190 230 195 255

245 300 250 340

12 0215 265 225 295

275 340 290 390

15 0 240 300 250 330305 385 325 440

18 5270 340 280 380

345 435 365 500

24 0310 400 325 450

395 510 420 590

30 0350 455 370 520

440 580 470 680

40 0395 530 420 610

495 660 530 780

50 0445 610 480 710

550 750 590 900

63 0-- -- 550 820

-- -- 660 1020

80 0-- -- 610 950

-- -- 730 1140

1000-- -- 680 1080

-- -- 790 1240

Ambient Air Temperature: 400 C

Ground temperature : 300 C

Thermal Resistivity o f Soil : 1500 C cm/ w

Maximum Continuous Conductor tempera ture : 900 CSingle Core Cable laid in TrefoilThree Core Cable laid SinglyMaximum Conductor Temperature

after Short Circuit : 250

0

C

Depth of Laying

3.3 kv to 11 kv Above 11 kv

900 mm 1050 mm

Tips:5.Key Manufacturing P rocess in HT Cable

Manufacturing.

Wet (Steam/ Hot Water) Cure Process

The chemistry of cross linking leads toC-Si-O-Si-C linkage.

The cores are cooled in water, post extrusion.

The cross linking takes place in a wetenvironment.

Curing is done by batch process.

Because of batch process, there is a limitation todrum length of cable.

The plant and machinery are not very expensive.

Losses are less in case of equipment/process malfunctioning.

This does not require very large factory space.

The process requires an associated curingarrangement in the form of steam y chamber orwater tank etc.

Curing is restricted to insulation only, semiconducting layers are of y thermoplasticcompound based.

Because of batch curing, extremely difficult tocrossing cores.beyond 33 kV. Chances ofnon-uniform cross linking cannot be ruled out.

Maintenance expenses are comparatively lower.

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PVC pow er cables with aluminium sector shaped conductors PVC power cables with aluminium conductors

1.1kv Power Cables(Armoured)

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Go to product category NextConstructional details aluminium

Pvc pow er cables w ith aluminum sector shaped conductors (armourded cables)

Sr.no.

Nominal

conductor

area

sq.mm.

Minimum

nos. of

w ires in

conductor

Nominal

thickness of

insulation in

mm

Minimum

thickness of

innersheath

in mm

Nominal

diameter/dimension of

G.I.armouring in mm

Minimum thicknass of

outer sheath in mm

Approximate overall

diameter in mm

Approximate weight

cable in kg/ kms.

Main

core

Half

coreMainNeutralL MainNeutral

Nos.of cores Number.of cores Number.of cores Number.of cores Number.of cores

2 3 3.5 4 2 3 3.5 4 2 3 3.5 4 2 3 3.5 4 2 3 3.5

1 25 16 6 7 1.2 1.0 0.30.3 0.3 0.34.0 x

0.8

4.0 x

0.8

4.0 x

0.8

4.0 x

0.8 1.40 1.40 1.40 1.40 20.4 23.8 25.8 27.0 675 855 975 1

(1.6) (1.6) (1.6) (1.6) (1.40)(1.40)(1.40)(1.40)(21.8)(25.3)(27.2)(28.0) (901) (1125)(1265) (1

2 35 16 6 7 1.2 1.0 0.30.3 0.3 0.34.0 x

0.8

4.0 x

0.8

4.0 x

0.8

4.0 x

0.81.40 1.40 1.40 1.40 22.0 25.6 27.9 29.1 785 1005 1130 1

(1.6) (1.6) (1.6) (1.6) (1.40)(1.40)(1.40)(1.56)(23.2)(27.3)(29.2)(30.7)(1030)(1295)(1445) (1

3 50 25 6 6 1.4 1.2 0.30.3 0.3 0.44.0 x

0.8

4.0 x

0.8

4.0 x

0.8

4.0 x

0.81.40 1.56 1.56 1.56 24.5 29.3 31.8 33.5 970 1275 1450 1

(1.6) (1.6) (1.6) (2.0) (1.56)(1.56)(1.56)(1.56)(26.0)(30.9)(33.2)(35.2)(1275)(1605)(1805) (2

4 70 35 12 6 1.4 1.2 0.30.4 0.4 0.44.0 x

0.8

4.0 x

0.8

4.0 x

0.8

4.0 x

0.81.56 1.56 1.56 1.56 27.0 32.3 35.0 36.5 1195 1570 1780 1

(1.6) (2.0) (2.0) (2.0) (1.56)(1.56)(1.56)(1.56)(28.3)(34.6)(37.4)(38.0)(1500)(2165)(2430) (2

-Wrapped thermoplastic tape inner sheath

-Standard drum length for all sizes : 500 mtrs. 5 %

-Values written in bracket are for g.i. wire armoured cables

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