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    • Last modified 29-Nov-2011
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BS7870 - 4.10 19/33kv Single Core Un-armoured

Description

19/33kV Single Core un-armoured XLPE insulated cables

Contact

01908 250839
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Description

19/33kV Single Core un-armoured XLPE insulated cables

Standards

International :  IEC 60502
National :  BS 7870-4.10 

Description

Important Note: this information is for general guidance only, based on standard design options.  Exact data will vary based upon the options required, and therefore a full data sheet for the exact design should be requested prior to any order.

Voltage Rating:

  • 19/33 (36) kV

Typical Constructions:

Conductors

  • Stranded Copper or
  • Stranded Aluminium
  • Option - water swellable powders or tapes

Conductor Screen

  • SC XLPE

Insulation

  • XLPE

Insulation Screen

  • Bonded SC XLPE
  • Option - cold strippable SC XLPE

Paper separation Tapes

  • Option - water swellable tapes

Copper Wire Screen

  • Number and diameter of wires dependant upon required earth fault rating
  • Option - copper equalising tapes applied helically

Sheath

  • Black MDPE
  • Option - LSOH material
  • Sheath embossed or indented with year of manufacture, size and type of conductor and voltage in accordance with design standard employed
  • Option - sequential metre marking

Docs and info

Typical Data for cables with Copper conductors

Nominal cross-sectional area

mm²

70

95

120

150

185

240

300

400

500

630

800

1000

Approximate diameter over conductor

mm

9.8

11.5

12.8

14.3

15.9

18.4

20.5

23.2

26.2

30.3

34.7

38

Approximate diameter over insulation

mm

27

28.7

30

31.5

33.1

35.6

38.1

41.2

44.2

48.3

52.7

57.3

Approximate overall diameter 

mm

34.1

36.1

37.5

39.3

41

43.8

46.6

50.2

53.4

58

66

71

Approximate weight of Cable 

kg/m

1560

1880

2160

2480

2860

3530

4220

5150

6250

7740

9630

12200

Minimum bending radius (static) 

mm

340

360

380

390

420

440

470

500

540

580

660

710

Maximum pulling tension on Cable

kg

350

475

600

750

925

1200

1500

2000

2500

3150

4000

5000

Maximum DC resistance 
(R) @ 20°C

W/km

0.268

0.193

0.153

0.124

0.0991

0.0754

0.0601

0.047

0.0366

0.0283

0.0221

0.0176

Maximum AC resistance 
(R’) @ 90°C

W/km

0.342

0.247

0.196

0.159

0.128

0.098

0.079

0.063

0.051

0.042

0.035

0.03

Inductance (L) @ 50Hz @ 90°C

mH/km

0.43

0.41

0.4

0.38

0.37

0.36

0.36

0.33

0.32

0.31

0.3

0.29

Approximate Capacitance  (C)

µF/km

0.14

0.16

0.17

0.18

0.2

0.22

0.25

0.26

0.29

0.32

0.35

0.38

Short circuit ratings

1 Second Short Circuit Rating
of Conductor  (90 to 250°C)

kA

9.7

13.5

17.1

21

26.3

34.6

43.4

57.7

72.1

90.7

115.1

143.8

1 Second Short Circuit Rating 
of a 35mm2 Copper wire 
screen (80 to 250°C)

kA

4.8

4.8

4.8

4.8

4.8

4.8

4.8

4.8

4.8

4.8

4.8

4.8

1 Second Short Circuit Rating 
of a 50mm2 Copper wire 
screen (80 to 250°C)

kA

8.2

8.2

8.2

8.2

8.2

8.2

8.2

8.2

8.2

8.2

8.2

8.2

Current Carrying Capacity (cables laid in trefoil)

Direct Buried

A

270

320

360

410

460

530

600

690

760

850

930

1010

Single way ducts

A

270

320

360

405

445

520

570

630

700

780

860

920

In Air 

A

320

390

445

510

580

680

770

890

1020

1160

1290

1430

Values for minimum bending radius are multiplied by two for cables being laid (dynamic)

Ampacity Values based on : 
· Depth of cover = 800mm ,
· Thermal resistivity of soil = 1.2K.m/W , 
· Soil  temperature = 15°C
· Ambient Air temperature = 25°C
· Maximum conductor temperature = 90°C

Typical Data for cables with Aluminium conductors

Nominal cross-sectional area

mm²

70

95

120

150

185

240

300

400

500

630

800

1000

1200

Approximate diameter over conductor

mm

9.8

11.4

12.9

14

16.2

18

20.5

23.3

26.4

30

34.7

38

41.2

Approximate diameter over insulation

mm

27

28.6

30.1

31.2

33.4

35.2

38.1

41.3

44.4

48

52.7

57.3

60.2

Approximate overall diameter 

mm

34.1

36

37.6

39

41.3

43.4

46.6

50.2

53.7

57.6

66

71

74

Approximate weight of Cable 

kg/m

1140

1290

1430

1550

1760

1990

2330

2740

3200

3770

4720

5480

6090

Minimum bending 
radius (static) 

mm

340

360

380

390

420

440

470

500

540

580

660

710

740

Maximum pulling 
tension on Cable

kg

210

285

360

450

555

720

900

1200

1500

1890

2400

3000

3600

Maximum DC resistance 
(R) @ 20°C

W/km

0.443

0.32

0.253

0.206

0.164

0.125

0.1

0.0778

0.0605

0.0469

0.0367

0.0291

0.0247

Maximum AC resistance 
(R’) @ 90°C

W/km

0.568

0.411

0.325

0.265

0.211

0.162

0.13

0.102

0.081

0.064

0.052

0.044

0.039

Inductance (L) @ 50Hz @ 90°C

mH/km

0.43

0.41

0.4

0.38

0.37

0.36

0.36

0.33

0.32

0.31

0.3

0.29

0.29

Approximate 
Capacitance  (C)

µF/km

0.14

0.16

0.17

0.18

0.2

0.22

0.25

0.26

0.29

0.32

0.35

0.38

0.41

Short circuit ratings

1 Second Short Circuit Rating 
of Conductor (90 to 250°C)

kA

6.8

9.2

11.6

14.5

17.8

23.1

28.8

38.3

47.8

60.2

76.4

95.4

114.4

1 Second Short Circuit Rating 
of a 35mm2 Copper wire 
screen (80 to 250°C)

kA

4.8

4.8

4.8

4.8

4.8

4.8

4.8

4.8

4.8

4.8

4.8

4.8

4.8

1 Second Short Circuit Rating 
of a 50mm2 Copper wire 
screen (80 to 250°C)

kA

8.2

8.2

8.2

8.2

8.2

8.2

8.2

8.2

8.2

8.2

8.2

8.2

8.2

Current Carrying Capacity (cables laid in trefoil)

Direct Buried

A

210

250

280

320

360

415

475

550

610

690

780

860

920

Single way ducts

A

210

250

280

320

350

415

460

520

570

650

770

800

980

In Air

A

250

305

345

400

450

530

600

700

820

940

1070

1210

1325

Values for minimum bending radius are multiplied by two for cables being laid (dynamic)

Ampacity Values based on : 
· Depth of cover = 800mm ,
· Thermal resistivity of soil = 1.2K.m/W , 
· Soil  temperature = 15°C
· Ambient Air temperature = 25°C
· Maximum conductor temperature = 90°C

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