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

Three Core Cables to VDE 0276

Application

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

3.6/6.6KV 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

Construction

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 operating 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=7.2)kV 6/10KV (Um=12KV) 8.7/15KV (Um=17KV) 12/20KV (Um=24KV) 18/30KV (Um=36KV)
mm² mm mm mm mm mm
  XLPE XLPE XLPE XLPE XLPE
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 covered 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 be applied over each core or applied as a collective screen. The metallic screen 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

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

 

Nominal Cross-
Section of Cables

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

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

0.271

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

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℃

Cross Section

Max. DC
Resistance at 20℃

Cross Section

Max. DC
Resistance at 20℃

Cross Section

Max. DC
Resistance at 20℃

Cross Section

Max. DC
Resistance at 20℃

mm²

mm²

Ω

mm²

Ω

mm²

Ω

mm²

Ω

mm²

Ω

70

6.6

2.616

7.23

2.380

8.02

2.145

8.7

1.967

10.5

1.075

95

7.3

2.369

7.91

2.174

8.71

1.975

9.4

1.824

11.2

1.075

120

8.0

2.153

8.64

1.991

9.43

1.823

10.2

1.694

12.0

1.075

150

8.5

2.013

9.19

1.871

9.99

1.722

10.7

1.606

12.5

0.688

185

9.4

1.838

9.88

1.741

10.82

1.590

11.4

1.509

13.2

0.688

240

10.4

1.656

10.96

1.569

11.76

1.463

12.5

1.378

14.3

0.688

300

11.4

1.508

11.84

1.452

12.64

1.361

13.4

1.287

15.2

0.688

400

12.6

1.362

12.92

1.332

13.71

1.254

14.4

1.192

16.2

0.491

500

13.9

1.237

14.34

1.199

15.14

1.136

15.5

1.110

17.7

0.491

630

15.3

1.121

16.68

1.031

16.57

1.038

17.3

0.995

19.1

0.491

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 is shown in table 3.

Table 3. Separation Sheath Thickness

Cores 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:

1) Double layers of galvanized steel tape are applied helically with proper inner overlapping over an extruded

separation sheath. Thickness of the steel tape is shown in table 4.

Tabel 4. Galvanized Steel Tape Thickness

Inner Diameter Thickness of Galvanized Steel Tape
mm mm
 
- 30 0.2
30 70 0.5
70 - 0.8

2) Galvanized flat steel wires with thickness of 0.8 mm are applied helically over the surface of inner sheath with

minimum of 90% coverage. And galvanized Steel tape with nominal thickness of 0.3 mm is applied helically with

50% coverage to cover the surface of the flat wires.

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 (Um) Testing Voltage
3.6/6KV 8KV 12.5KV
6/10KV 12KV 21KV
8.7/15KV 18KV 30.5KV
12/20KV 24KV 42KV
18/30KV 36KV 63KV

Medium  Voltage Cables to VDE 0276

TYPE CODES:

Conductor

N          According to VDE Standard (No abbreviation for copper conductor) A  Aluminium conductor

Copper conductor

Insulation

2X       XLPE

Screen

C        Concentric conductor of copper

CE       Concentric conductor of copper over each individual core

S         Screen of copper wires & copper tape,helically wound

SE       Screen of copper wires over each individual cores

(G)      Longitudinally waterproof

Armour

F         Armour of galvanized flat steel wire

G        Counter Helix of galvanized steel tape

B         Steel tape armouring

R        Armour of galvanized round steel wire

Sheath

2Y        PE

Y           PVC H           LSZH

K         Lead sheath

KL       Aluminium sheath

Three Core 3.6/6KV (Um=7.2KV) N2XSEY
NA2XSEY
Dimensional Data

Nom. Cross- Section Area

 

Approx. Conductor Diameter

 

Nom. Insulation Thickness

Copper Tape Screen
Area (0.1mm)

Copper Wire Screen Area

 

Approx. Insulation Diameter

 

Nom. Sheath Thickness

 

Approx. Overall Diameter

 

Approx. Weight

 

CU

 

AL

mm²

mm

mm

mm²

mm²

mm

mm

mm

kg/km

kg/km

25

6.05

2.5

15.1

16

12.5

1.5

37

2100

1600

35

7.10

2.5

16.3

16

13.5

1.6

39

2500

1800

50

8.25

2.5

17.8

16

14.7

1.6

42

3000

2100

70

9.90

2.5

19.7

16

16.3

1.7

46

3800

2500

95

11.7

2.5

21.8

16

18.1

1.7

50

4800

3000

120

13.1

2.5

24.0

16

19.5

1.8

53

5800

3500

150

14.3

2.5

25.6

25

20.7

1.8

56

6700

3900

185

16.3

2.5

28.1

25

22.7

1.9

60

8100

4600

240

18.7

2.6

31.2

25

25.3

1.9

66

10200

5600

300

20.9

2.8

34.2

25

27.9

2.0

72

12500

6700

400

23.7

3.0

37.9

35

31.1

2.1

80

15600

8200

Three Core 3.6/6KV (Um=7.2KV) Galvanized Steel Tape Armoured Cables N2XSEYBY
NA2XSEYBY
Dimensional Data

Nom. Cross- Section Area

 

Approx. Conductor Diameter

 

Nom. Insulation Thickness

Copper Tape Screen Area (0.1mm)

Copper Wire Screen Area

 

Approx. Insulation Diameter

 

Nom. Armour Thickness

 

Nom. Sheath Thickness

 

Approx. Overall Diameter

 

Approx. Weight

 

CU

 

AL

mm²

mm

mm

mm²

mm²

mm

mm

mm

mm

kg/km

kg/km

25

6.05

2.5

5.0

16

12.5

0.5

2.2

39

2800

2300

35

7.10

2.5

5.4

16

13.5

0.5

2.3

42

3200

2600

50

8.25

2.5

5.9

16

14.7

0.5

2.4

45

3800

2900

70

9.90

2.5

6.6

16

16.3

0.5

2.5

49

4700

3400

95

11.7

2.5

7.3

16

18.1

0.5

2.6

53

5800

4000

120

13.1

2.5

8.0

16

19.5

0.5

2.7

56

6800

4600

150

14.3

2.5

8.5

25

20.7

0.5

2.8

59

7900

5100

185

16.3

2.5

9.4

25

22.7

0.8

2.9

64

9400

5900

240

18.7

2.6

10.4

25

25.3

0.8

3.1

70

11700

7000

300

20.9

2.8

11.4

25

27.9

0.8

3.3

76

14100

8300

400

23.7

3.0

12.6

35

31.1

0.8

3.6

85

18300

10900

 

*Optional wire screen can be provided in combination of copper tapes. Nominal screen area, as stated in the table, can be supplied as standard.

Three Core 3.6/6KV (Um=7.2KV) Galvanized Flat Steel wire+Steel Tape Armoured Cables

Three Core 6/10KV (Um=12KV)

Three Core  8.7/15KV (Um=17.5KV)

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

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

Current Rating for Three Core 1.8/3KV(Um=7.2 )KV to 26/35KV(Um=42KV))