Power Cables

Cross-sectional area mmsq

Minimum average thickness of insulation mm

Nominal diameter over insulation
mm

Nominal thickness of PVC bedding
mm

Nominal number and diameter of armoured wires no./mm

Nominal thickness of PVC oversheath
mm

Nominal overall diameter of cable mm

70

3.4

18.8

1.4

54/2.5

2.7

57.1

95

3.4

20.5

1.5

59/2.5

2.8

61.2

120

3.4

22.0

1.6

62/2.5

3.0

65.0

150

3.4

23.3

1.6

65/2.5

3.1

68.0

185

3.4

25.1

1.7

70/2.5

3.2

72.3

240

3.4

27.3

1.8

61/3.15

3.4

79.0

300

3.4

29.6

1.9

65/3.15

3.6

84.5

400

3.4

32.3

2.0

70/3.15

3.8

90.9

Cross-sectional area mmsq

Approximate cable weight kg/m

Nominal drum length
m

Minimum bending radius mm

Nominal internal diameter of ducts mm

70

5.1

500

700

100

95

5.7

500

750

100

120

6.4

500

800

100

150

6.9

500

850

125

185

7.3

500

900

125

240

9.7

500

950

125

300

10.9

450

1050

125

400

12.5

400

1100

125

Cross-sectional area mmsq

Maximum DC resistance of conductor at 20 ℃ uohms/m

Maximum AC resistance of conductor at 90 ℃ 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

108

578

298

0.62

95

320

410

102

422

334

0.67

120

253

325

98.8

340

365

0.73

150

206

265

96.2

282

392

0.78

185

164

211

93.1

231

430

0.86

240

125

161

90.0

184

476

0.95

300

100

130

87.4

157

524

1.05

400

77.8

102

84.9

133

580

1.16

Cross-sectional area
mmsq

Current Ratings

Short circuit ratings

Laid direct 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

195

165

210

6.3

Typically

less

than

1kA

95

230

200

250

8.5

120

265

225

295

11.0

150

295

255

330

13.5

185

335

290

385

17.0

240

380

335

450

22.3

300

435

375

510

28.0

400

480

420

570

36.6