Medium Voltage Cables
Medium Voltage Cables to BS 6622 Medium Voltage Cables to IEC 60502 Medium Voltage Cables to VDE 0276

Medium Voltage Cables to VDE 0276

Single Core Cables to VDE 0276

Application

The single core cables are designed for distribution of electrical power with nominal voltage Uo/U ranging from

3.8/6.6KV to 19/33KV and frequency 50Hz. They are suitable for installation mostly in power supply stations,

indoors and in cable ducts, outdoors, underground and in water as well as for installation on cable trays for

industries, switchboards and power stations.

Standards

DIN VDE 0276 Part 620 -622

HD 620 S1

Conductor:

Stranded compacted circular copper or aluminium conductors according to IEC 60228 class 2 / VDE 0276 class 2 /

VDE 0295 HD 383. All internal interstices of the conductor are filled with water blocking compound to prevent

ingress of water through conductor during storage, handing, installation and operation of the cable.

Conductor Screen:

The conductor screen consists of an extruded layer of non metallic, semi-conducting compound firmly bonded to

the insulation to exclude all air voids. The screen has a minimum thickness of 0.3mm and the maximum volume

resistivity of 500 Ohm-m at 90°C.

Insulation:

Insulation is of extruded XLPE compound type 2XI1 according to DIN VDE 0207 part 22 and HD 620.1 with high

degree of cross-linking, free from contaminants, air voids and heat resistant by dry cured process.

The nominal insulation wall thickness is shown in table 1.

Table 1. Insulation Thickness

Nom. Cross
Section Area
Insulation Thickness at Nom. Voltage
3.6/6KV
(Um=7.2kV)
6/10kV
(Um=12kV)
8.7/15kV
(Um=17.5kV)
12/20kV
(Um=24kV)
18/30kv
(Um=36kV)
mm² mm mm mm mm mm
35 2.5 3.4 4.5 5.5 -
50 2.5 3.4 4.5 5.5 8.0
70 2.5 3.4 4.5 5.5 8.0
95 2.5 3.4 4.5 5.5 8.0
120 2.5 3.4 4.5 5.5 8.0
150 2.5 3.4 4.5 5.5 8.0
185 2.5 3.4 4.5 5.5 8.0
240 2.6 3.4 4.5 5.5 8.0
300 2.8 3.4 4.5 5.5 8.0
400 3.0 3.4 4.5 5.5 8.0

Insulation Screen:

The insulation screen consists of extruded non metallic, semi-conducting compound extruded over the insulation.

The extruded semi-conducting layer shall consist of bonded or cold strippable semi-conducting compound

capable of removal for jointing or terminating.The minimum thickness is 0.3mm and the maximum volume

resistivity of 500 Ohm-m at 90°C. The screen is tightly fitted to the insulation to exclude all air voids and can be

easily hand stripped on site.

Conducting Water Blocking Layer:

The insulation screen may be coverd by semi- conductive water blocking tape which will swell up under the

influence of moisture of water to ensure longitudinal watertightness.

Metallic Layer

The metallic layer shall consist of either copper tapes or a concentric layer  of copper wires or a combination of

tapes and wires. The metallic layer provides an earth  fault current path, capable of withstanding fault current to

earth of 1000A for one second at maximum temperature 160°C. Copper wires are applied over the conducting

water blocking layer with a minimum diameter of 0.5mm. As an alternative, copper tape(s) with minimum

thickness of 0.1mm can be applied with overlap. Total cross section of copper wire screen and copper tape

screen layer are shown in Table 2a and 2b.

Table 2a. Total Cross Section and Max. DC Resistance of Copper Wire Screen

Nominal Cross-
Section of Cables mm²

Total Cross Section

Max. DC Resistance of Copper Wire Screen at 20℃

3.8/6.6KV (Um=7.2KV)

6.35/11KV (Um=12KV)

8.7/15KV (Um=17.5KV)

12.7/22KV (Um=24KV)

19/33KV (Um=36KV)

mm²

mm²

Ω

70

16

16

16

16

16

1.19

95

16

16

16

16

16

1.19

120

16

16

16

16

16

1.19

150

25

25

25

25

25

0.759

185

25

25

25

25

25

0.759

240

25

25

25

25

25

0.759

300

25

25

25

25

25

0.759

400

35

35

35

35

35

0.271

500

35

35

35

35

35

0.217

630

35

35

35

35

35

0.271

Table 2b. Total Cross Section and Max. DC Resistance of Copper Tape Screen (0.1mm)

Nominal Cross- Section of Cables mm²

Total Cross Section & Max. DC Resistance

3.8/6.6KV (Um=7.2KV)

6.35/11KV (Um=12KV)

8.7/15KV (Um=17.5KV)

12.7/22KV (Um=24KV)

19/33KV (Um=36KV)

 

Total Cross Section

Max. DC Resistance
at 20℃

Total Cross Section

Max. DC Resistance
at 20℃

 

Total Cross Section

Max. DC Resistance
at 20℃

 

Total Cross Section

Max. DC Resistance
at 20℃

Total Cross Section

Max. DC Resistance
at 20℃

mm²

mm²

Ω

mm²

Ω

mm²

Ω

mm²

Ω

mm²

Ω

70

7.4

2.314

8.2

2.106

9.1

1.897

9.9

1.740

11.9

1.442

95

8.2

2.095

8.9

1.923

9.8

1.748

10.7

1.614

12.7

1.354

120

9.0

1.905

9.8

1.761

10.7

1.613

11.5

1.498

13.5

1.272

150

9.7

1.781

10.4

1.655

11.3

1.523

12.1

1.420

14.2

1.215

185

10.6

1.626

11.2

1.540

12.2

1.407

12.9

1.335

14.9

1.153

240

11.7

1.465

12.4

1.388

13.3

1.294

14.1

1.219

16.2

1.065

300

12.9

1.334

13.4

1.285

14.3

1.204

15.1

1.139

17.1

1.003

400

14.3

1.205

14.6

1.178

15.5

1.110

16.3

1.054

18.4

0.937

500

15.7

1.094

16.2

1.061

17.1

1.005

17.5

0.982

20.0

0.861

630

17.3

0.992

18.9

0.912

18.7

0.918

19.5

0.880

21.6

0.797

Separator / Water Blocking Layer:

The metallic screen may be covered by non-conducting water blocking tape which will swell up under the

influence of moisture of water to ensure longitudinal watertightness.

Separation Sheath (for armoured cable):

The separation sheath comprises a layer of extruded PVC, PE or LSZH, applied under the armour. Thickness of

separation sheath as shown in table 3.
Table 3. Separation Sheath Thickness

Core Diameter Approx.Thickess of Inner Sheath
mm mm
>  <   
35 45 1.4
45 60 1.6
60 80 1.8
80 - 2.0

Armour (for armoured cable):

The armour consists of round aluminium wire armour applied helically over an extruded separation sheath.

Table 4. Round Armour Wire Diameter

Fictitious Diameter Under the Armour Armour Wire Diameter
mm mm
 
- 10 0.8
10 15 1.25
15 25 1.6
25 35 2.0
35 60 2.5
60 - 3.15

Outer Sheath:

Overall sheath comprises a layer of extruded PE compound DMP2 according to HD620.1 and 2YM3 type to DIN

VDE 0276 Part 3, or PVC compound DMV6 according to HD620.1 and YM5 to DIN VDE 0276 Part 6. Normal wall

thickness is 2.5mm (1/500mm 18/30sq 2.6mm), suitable for exposure to sun-light or other local atmospheric

environments and for the operating temperature of the cable.

PHYSICAL PROPERTIES:

Operating Temperature: up to 90°C

Temperature Range: -5°C ( PVC sheath ); -20°C ( PE sheath )

Short Circuit Temperature: 250°C (short circuit duration up to 5 seconds)

Bending Radius: 15 x OD (Cable without metal sheath)

30 x OD (Cable with aluminium sheath)
Table 5. Nominal /Operating /Testing Voltages

Nominal Voltage Uo/U Operating Voltage (max) Testing Voltage
3.6/6KV 8KV 10KV
6/10KV 12KV 15KV
8.7/15KV 18KV 22.5KV
12/20KV 24KV 30KV
18/30KV 36KV 45KV

TYPE CODES:

Cores
N         According to VDE Standard (No abbreviation for copper conductor) A           Aluminium Conductor
2X      XLPE Insulation
Y        PVC Insulation

Screen
S        Screen of copper wires and copper tape, helically wound.
SE      Screen of copper wire plus copper tape over each individual cores, helically wound
(F)      Longitudinally waterproof screen.

Concentric Conductor Screen
C        Concentric conductor screen of copper wires and copper tape, helically wound.
CE     Concentric conductor screen of copper wire plus copper tape over each individual cores, helically wound.

Jacket
2Y      PE Jacket
Y        PVC Jacket
H        LSZH Jacket

Single Core 1.8/3KV (Um=3.6KV) Dimensional Data

Nom. Cross- Section Area

Nom. Insulation Thickness

Nom. Sheath Thickness

Nom. Overall Diameter

Approx. Weight

N2XSY/ N2XSH CU

NA2XSY/ NA2XSH AL

N2XS2Y CU

NA2XS2Y AL

N2XS(F)2Y CU

NA2XS(F) 2Y AL

mm²

mm

mm

mm

kg/km

kg/km

kg/km

kg/km

kg/km

kg/km

25

2.0

1.4

13

500

180

480

140

500

230

35

2.0

1.4

14

620

280

600

240

620

330

50

2.0

1.4

15

700

380

750

290

750

430

70

2.0

1.5

17

900

480

800

380

1000

560

95

2.0

1.5

19

1200

590

1050

460

1300

670

120

2.0

1.6

21

1450

700

1300

550

1500

800

150

2.0

1.6

22

1700

800

1550

650

1800

900

185

2.0

1.7

24

2050

850

1900

750

2150

950

240

2.0

1.8

27

2550

1050

2350

900

2650

1150

300

2.0

1.8

29

3150

1250

2950

1050

3250

1350

400

2.0

1.9

32

3950

1550

3800

1450

4100

1650

500

2.2

2.0

35

5000

2000

4800

1800

5200

2150

630

2.4

2.2

38

6200

2200

6300

2100

6400

2350

800

2.6

2.3

44

8000

2900

7900

2800

8200

3050

 

Electrical Data

Nom. Cross- Section Area

D C
Resistance CU / AL

A C
Resistance CU / AL

Short Circuit Rating of Conductor CU / AL
1 sec

Capaci- tance

Charging Current

Reactance

Inductance

Impedance

Trefoil

Flat Spaced

Trefoil

Flat Spaced

 

Trefoil

Flat Spaced

CU

AL

CU

AL

mm²

µΩ/m

µΩm

kA

pF/m

mA/m

µΩ/m

nH/m

µΩ/ m

µΩ/ m

25

727/1200

929/1538

3.6/2.3

222

0.32

131

185

345

535

936

1544

952

1554

35

524/868

668/1113

5.0/3.2

251

0.35

122

178

327

524

679

1121

695

1131

50

387/641

494/822

6.8/4.4

281

0.39

116

172

313

514

511

834

527

844

70

268/443

343/568

9.8/6.3

341

0.45

110

165

300

495

364

583

386

597

95

193/320

248/410

13.3/8.5

397

0.50

104

160

287

485

272

427

300

446

120

153/253

196/325

17.2/11.0

430

0.55

104

159

280

475

225

345

257

367

150

124/206

159/265

21.2/13.5

464

0.59

100

156

274

465

193

287

229

313

185

99/164

128/211

26.6/17.0

513

0.65

98

154

267

459

165

237

206

267

240

75/125

98/161

34.9/22.3

573

0.70

94

150

260

455

140

191

185

226

300

60/100

80/130

43.8/28.0

652

0.72

91

147

253

445

128

163

174

203

400

47/78

64/102

57.3/36.6

727

0.75

90

147

248

435

113

141

164

184

500

37/60

51/81

72.3/46.2

754

0.79

89

145

245

425

105

124

158

171

630

28/47

42/64

91.2/58.3

786

0.87

86

143

243

415

97

110

151

160

SIngle Core 3.6/6KV (Um=7.2 KV)
Single Core 6/10KV (Um=12 KV)
Singke Core 8.7/15KV (Um=17.5KV)
Single Core 12/20KV (Um=24KV)  
Single Core 18/30KV (Um=36KV)
Current Rating for Single Core 1.8/3KV(Um=3.6KV ) to 18/30KV(Um=36KV)

Current Rating Conditions:

Ground Temperature: 20°C

Ambient Temperature (air): 30°C

Depth of Soil: 0.8m

Thermal Resistance of Soil: 1.5K•m/W