BS 6622 Single Core Armoured 6.6kv XLPE Stranded Aluminium Conductor

Size mmsq

Minimum Average Thickness of Insulation mm

Nominal Area of Copper Tape Screen 
mm sq

Nominal Thickness of Bedding

Nominal number and diameter of armoured wires no./ mm

Nominal Thickness of Sheath mm

Nominal Overall Diameter mm

70

2.5

16.8

1.2

38/1.6

1.8

27.5

95

2.5

18.5

1.2

41/1.6

1.9

29.4

120

2.5

20

1.2

44/1.6

1.9

30.9

150

2.5

21.3

1.2

46/1.6

2.0

32.4

185

2.5

23.1

1.2

40/2.0

2.0

35.0

240

2.6

25.5

1.2

43/2.0

2.1

37.6

300

2.8

28.3

1.2

47/2.0

2.2

40.8

400

3

31.4

1.2

51/2.0

2.3

44.1

500

3.2

34.7

1.3

46/2.5

2.5

49.0

630

3.2

38.6

1.4

50/2.5

2.6

53.3

Size

mmsq

Approximate Cable Weight kg/m

Nominal Drum Length 
m

Minimum Bending Radius mm

Nominal Internal Diameter of Ducts mm

70

1.0

1000

450

100

95

1.2

1000

450

100

120

1.3

1000

500

100

150

1.5

500

500

100

185

1.7

500

550

100

240

2.0

500

600

100

300

2.4

500

650

100

400

2.8

500

700

100

500

3.4

300

750

100

630

4.1

300

800

100

Size

mmsq

Maximum DC resistance of conductor at 20 ºC uohms/m

Maximum AC resistance of conductor at 90 ºC uohms/m

Reactance at 50Hz uohms/m

Impedance at 50Hz uohms/m

Maximum Capacitace PF/m

Maximum charging current at normal voltage and frequency mA/m

70

443

568

125

582

371

0.45

95

320

410

119

427

417

0.50

120

253

325

114

344

459

0.55

150

206

265

111

288

494

0.59

185

164

211

109

238

543

0.65

240

125

161

105

193

583

0.70

300

100

130

103

167

602

0.72

400

77.8

102

99.9

143

627

0.75

500

60.5

81.0

99.2

129

654

0.79

630

46.9

64.0

95.5

116

737

0.87

Size 
mmsq

Current Ratings

Short circuit ratings

Laid in ground 
Amps

Drawn into ducts 
Amps

Laid in air 
Amps

One second short circuit rating of conductor 
KA

One second short circuit rating of copper per core 
Ka

70

210

210

240

6.3

–

95

250

245

295

8.5

–

120

280

275

335

11.0

Typically

150

315

300

380

13.5

Less

185

355

335

435

17.0

Then

240

405

380

510

22.3

1kA

300

455

420

580

28.0

–

400

510

455

670

36.6

–

500

570

500

770

46.2

–

630

640

550

880

58.3

–