Three Core 21/35KV Medium Voltage Steel Tape Armoured Cable

The Three Core 21/35kV Steel Tape Armoured Cable is designed for medium voltage power distribution up to 35kV. It consists of three insulated conductors, usually made of copper or aluminum, with XLPE insulation that offers high dielectric strength, thermal stability, and resistance to moisture and chemicals. The conductors are protected by steel tape armor, providing excellent mechanical protection and durability for installation in demanding environments such as underground or outdoor applications. An outer sheath further safeguards against environmental factors. This cable is commonly used in industrial, utility, and infrastructure projects requiring reliable and safe medium voltage power transmission.

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Three Core 21/35KV Medium Voltage Steel Tape Armoured Cable

Three Core 21/35KV (Um=42KV) Armoured cable

  • Rated Voltage 21/35kV
  • 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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Three Core 21/35KV Medium Voltage Steel Tape Armoured Cable Application

XLPE(Cross linked polyethylene) insulated cable functions well for electricity transmission and distribution lines for its excellent electrical and physical properties, including the advantage of simplicity in construction, lightness in weight; convenience in application besides its excellent electrical, thermal, mechanical and anti-chemical corrosion properties.

GB/12706-2008, IEC60502,IEC 60228,IEC60332 BS 5467,BS 6622 , IS 1554 , IS 7098and ICEA S-66-524 etc.

CONSTRUCTION :
Three Core 21/35KV Medium Voltage Steel Tape Armoured Cable Construction

Three Core Medium Voltage Steel Tape Armoured Cable Construction

Three Core Medium Voltage Steel Tape Armoured Cable Construction

Conductor: Plain annealed stranded compacted circular copper or aluminium conductor to IEC60228 class 2

Conductor Screen: Extruded semi-conductive compound

Insulation: XLPE (cross-linked polyethylene) rated at 90°C

Insulation Screen: Extruded semi-conductive compound

Metallic Screen: copper tape or a concentric layer of copper wires

Color for core identification: Red, Yellow ,Blue tape shall be applied between insulation screen and metallic screen ( The above identifying can be changed as user requirement)

Assembly : Three screened cores are laid up together ,if necessary filled with non-hygroscopic material compatible with insulation and covered with a layer of PVC sheath

Inner Sheath: Extruded layer of PVC ST2 or PE , LSZH

Armour : Double of galvanized steel tape or galvanized steel wire for three core power cable , Double of aluminium tape or aluminium wire for single power cable ,

Outer Sheath: PVC type ST2 to IEC 60502 or PE ,LSZH

DIMENSIONAL DATA

Three Core 21/35KV Steel Tape Armoured Cable

Specification

Outer diameter

Nominal thickness of insulation

Steel tape

Layer×thickness

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

mm

kg/km

kg/km

A

A

A

A

3×50

8.4

9.3

2×0.5

3.5

79.2

7347.7

6415.0

180

140

190

145

3×70

10.0

9.3

2×0.8

3.7

84.1

9098.0

7792.2

220

170

230

180

3×95

11.5

9.3

2×0.8

3.8

87.9

10338.9

8566.8

265

205

275

215

3×120

13.0

9.3

2×0.8

3.9

91.4

11507.9

9269.5

310

240

315

245

3×150

14.5

9.3

2×0.8

4.0

95.0

12819.4

10021.3

350

270

355

275

3×185

16.2

9.3

2×0.8

4.1

99.0

14325.3

10874.4

400

310

400

310

3×240

18.4

9.3

2×0.8

4.3

104.2

16451.4

11974.5

465

360

460

360

3×300

20.5

9.3

2×0.8

4.4

109.2

18773.8

13177.7

535

420

520

410

3×400

23.5

9.3

2×0.8

4.7

116.4

22472.7

15011.2

615

485

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