Three Core 18/30KV Medium Voltage Unarmored Cable

The 18/30kV Three Core Medium Voltage Unarmored Cable is engineered for power transmission and distribution systems in utility networks, industrial facilities, and infrastructure projects operating at a nominal voltage of 30kV.

  • Three Core 18 30kv Medium Voltage Unarmored Cable

Three Core 18/30KV Medium Voltage Unarmored Cable


Three Core 18/30KV (Um=36KV) Unarmored Cable

  • Rated Voltage 18/30kV
  • 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 18/30kV Three Core Medium Voltage Unarmored Cable is engineered for power transmission and distribution systems in utility networks, industrial facilities, and infrastructure projects operating at a nominal voltage of 30kV.

Thanks to the use of XLPE (Cross-linked Polyethylene) insulation, this cable offers a superior combination of dielectric strength, mechanical durability, thermal stability, and chemical resistance. It is especially suitable for installations where armor protection is not required, but where reliable, long-lasting medium voltage performance is essential.

Whether installed in trays, ducts, or directly underground (where conditions allow), this cable ensures safe and efficient power delivery for medium voltage applications.


Compliance Standards

This cable meets or exceeds the following national and international standards:

  • IEC 60502-2

  • IEC 60228

  • IEC 60332-1

  • GB/T 12706-2008

  • BS 5467 / BS 6622

  • IS 7098 / IS 1554

  • ICEA S-66-524

CONSTRUCTION

Three Core Medium Voltage Unarmored Cable Construction

Three Core Medium Voltage Unarmored Cable Construction

ComponentDescription
ConductorStranded and compacted plain annealed copper or aluminum conductor
(IEC 60228 Class 2)
Conductor ScreenExtruded layer of semi-conductive compound
InsulationHigh-quality XLPE (Cross-linked Polyethylene), operating temperature up to 90°C
Insulation ScreenExtruded semi-conductive layer over insulation
Metallic ScreenCopper tape or concentric copper wires applied to each core
Core IdentificationRed, Yellow, Blue (identification tapes applied between insulation and screen)
(Other color codes available on request)
AssemblyThree insulated and screened cores laid up together with optional non-hygroscopic fillers
Outer SheathBlack PVC (Type ST2 per IEC 60502), optional PE or LSZH outer sheath

Advantages of 18/30kV Unarmored XLPE Cables

  • Lightweight design simplifies handling and installation

  • High current-carrying capacity with reduced dielectric losses

  • Ideal for indoor and outdoor fixed installations in non-armored environments

  • Excellent resistance to chemical agents, abrasion, and weathering

  • Available in copper or aluminum conductor options based on project requirements

DIMENSIONAL DATA
Three Core 18/30KV 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

8.0

3.0

61.5

3649.8

3183.5

125

98

135

105

3×35

7.0

8.0

3.0

63.8

4152.9

3500.0

150

115

160

125

3×50

8.4

8.0

3.1

67.0

4835.5

3902.8

180

140

190

145

3×70

10.0

8.0

3.2

70.7

5671.0

4365.3

220

170

230

180

3×95

11.5

8.0

3.4

74.1

6657.3

4885.1

265

205

275

215

3×120

13.0

8.0

3.5

77.6

7644.8

5406.4

305

235

315

245

3×150

14.5

8.0

3.6

81.0

8772.7

5974.6

345

270

355

275

3×185

16.2

8.0

3.7

84.9

10070.4

6619.4

390

305

400

310

3×240

18.4

8.0

3.9

90.0

12003.2

7526.3

455

355

460

360

3×300

20.5

8.0

4.0

94.8

14060.2

8464.1

525

410

520

410

3×400

23.5

8.0

4.2

101.8

17364.8

9903.3

600

470

590

465

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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