CONTINUOUS CURRENT RATING & CONDUCTOR RESISTANCE

Continuous current rating capacity is an important factor for the selection of the optimum size of the conductor in a

cable. The sustained current carrying capacity of Trailing & Mining Cables given in the table are for a single circuit

and based on an ambient temperature of 30C.

Nominal Cross

No. of Wires / Nom.

Current Rating for Cable with

Current Rating for Cable with

Maximum Conductor

Sectional Area

Wire Diameter

General Purpose Insulation

Heat Resisting Insulation

Resisting at 20C.

(Sq. mm.)

(No.s/mm)

(A)

(A)

(Ohms / Km)

0.50

16/0.20

4

5

40.1

0.75

24/0.20

8

10

26.7

1.0

32/0.20

12

14

20.0

1.5

48/0.20

20

24

13.7

2.5

80/0.20

22

27

8.21

4.00

56/0.30

28

34

5.09

6.00

85/0.30

36

44

3.39

10.00

80/0.40

49

60

1.95

16.00

126/0.40

66

81

1.24

25.00

196/0.40

85

105

0.795

35.00

276/0.40

100

125

0.565

50.00

396/0.40

130

160

0.393

70.00

356/0.50

160

195

0.277

95.00

484/0.50

190

235

0.210

120.00

610/0.50

220

270

0.164

150.00

764/0.50

250

305

0.132

185.00

942/0.50

285

350

0.108

240.00

1221/0.50

330

405

0.0817

300.00

1527/0.50

385

470

0.0654

400.00

2037/0.50

450

530

0.0495

500.00

2546/0.50

570

670

0.0391

630.00

3210/0.50

720

800

0.0292