Three Core 12/20KV Medium Voltage Unarmored Cable

The Three Core 12/20kV Medium Voltage Unarmored Cable is designed for electricity transmission and distribution networks, particularly in fixed installations such as industrial plants, utilities, and infrastructure projects.

  • Three Core 12 20kv Medium Voltage Unarmored Cable

Three Core 12/20KV Medium Voltage Unarmored Cable


Three Core 12/20KV (Um=24KV) Unarmored Cable

  • Rated Voltage 12/20kV
  • Conductor Material Copper or Aluminum
  • Operating Temperature up to 90°C
  • Short Circuit Temperature 250°C
  • Bending Radius 15 x OD


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The Three Core 12/20kV Medium Voltage Unarmored Cable is designed for electricity transmission and distribution networks, particularly in fixed installations such as industrial plants, utilities, and infrastructure projects.

This cable features XLPE (cross-linked polyethylene) insulation, which offers excellent electrical, thermal, and mechanical properties, along with chemical resistance. It is lightweight, easy to install, and ideal for indoor and outdoor use where armor protection is not required.


Standards

This product complies with a wide range of international and national standards, including:

  • GB/T 12706-2008

  • IEC 60502-2

  • IEC 60228

  • IEC 60332

  • BS 5467, BS 6622

  • IS 7098, IS 1554

  • ICEA S-66-524

CONSTRUCTION :
Three Core 12/20KV Medium Voltage Unarmored Cable Construction

Three Core Medium Voltage Unarmored Cable Construction

Three Core Medium Voltage Unarmored Cable Construction

ComponentDescription
ConductorPlain annealed, stranded, compacted circular copper or aluminum conductor
to IEC 60228 Class 2
Conductor ScreenExtruded semi-conductive compound
InsulationXLPE (Cross-linked Polyethylene), rated at 90°C
Insulation ScreenExtruded semi-conductive compound
Metallic ScreenCopper tape or concentric copper wires, one per core
Core IdentificationRed, Yellow, Blue tape between insulation screen and metallic screen
(other options available on request)
AssemblyThree screened cores laid up together, with non-hygroscopic fillers as needed
Outer SheathPVC (Type ST2 per IEC 60502), PE, or LSZH (Low Smoke Zero Halogen) optional
DIMENSIONAL DATA

Three Core 12/20KV Medium Voltage Unarmored Cable

Specification

Outer diameter

Nominal thickness of insulation

Nominal sheath thickness

 Approx. Outer diameter of cable

Approx. Weight of cable

Ampacity of cable

Air

Soil

CU

AL

Cu

Al

Cu

Al

mm2

mm

mm

mm

mm

kg/km

kg/km

A

A

A

A

3×25

6.0

5.5

2.6

49.9

2491.3

2025.0

125

96

135

105

3×35

7.0

5.5

2.7

52.3

2922.3

2269.4

150

115

160

125

3×50

8.4

5.5

2.8

55.5

3536.9

2604.2

175

135

190

150

3×70

10.0

5.5

2.9

59.1

4314.1

3008.3

220

170

235

185

3×95

11.5

5.5

3.0

62.6

5243.6

3471.5

265

205

285

220

3×120

13.0

5.5

3.1

66.1

6142.2

3903.7

305

235

320

250

3×150

14.5

5.5

3.2

69.5

7211.1

4413.0

350

270

365

285

3×185

16.2

5.5

3.3

73.4

8423.3

4972.4

395

310

410

320

3×240

18.4

5.5

3.5

78.5

10279.2

5802.3

465

365

475

370

3×300

20.5

5.5

3.6

83.3

12247.7

6651.5

530

415

535

420

3×400

23.5

5.5

3.9

90.2

15418.2

7956.7

615

485

605

480

TECHNICAL PARAMETERS

Max. Permissible D.C. resistance of conductor at 20℃

Nominal section area (mm2)

Copper conductor(Ω/km)

Aluminum conductor(Ω/km)

1.5

12.1

-

2.5

7.41

12.1

4

4.61

7.41

6

3.08

4.61

10

1.83

3.08

16

1.15

1.91

25

0.727

1.20

35

0.524

0.868

50

0.387

0.641

70

0.268

0.443

95

0.193

0.320

120

0.153

0.253

150

0.124

0.206

185

0.0991

0.164

240

0.0754

0.125

300

0.0601

0.100

400

0.0470

0.0778

500

0.0366

0.0605

630

0.0283

0.0469

Max. Permissible short-circuit current for conductor (reference value)

Nominal section area (mm2)

Maximum permissible short-circuit current for conductor(1s)(KA)

Copper conductor

 Aluminum conductor

1.5

0.12

0.13

2.5

0.32

0.22

4

0.50

0.34

6

0.76

0.51

10

1.51

0.99

16

2.39

1.56

25

3.69

2.42

35

5.15

3.37

50

7.31

4.79

70

10.2

6.68

95

13.8

9.03

120

17.4

11.4

150

21.7

14.2

185

26.7

17.5

240

34.6

22.6

300

43.1

28.2

400

57.4

37.65

500

71.7

47.0

630

88.8

58.0

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