7.Lt Cable Sizing Calculation

Cable size 400.00

Current 530.00

300.00

455.00

240.00

399.00

185.00

337.00

150.00

292.00

120.00

257.00

95.00

221.00

70.00

198.00

50.00

162.00

35.00

132.00

25.00

108.00

16.00

79.00

10.00

62.00

6.00

49.00

4.00

38.00

2.50

30.00

Cable size

V/A/Km

400.00

0.21

300.00

0.26

240.00

0.31

185.00

0.39

150.00

0.48

120.00

0.58

95.00

0.72

70.00

0.543

50.00

0.777

35.00

1.047

25.00

1.447

16.00

2.28

10.00

3.627

6.00

6.825

4.00

10.22

2 50

16 454

Source: KEI cable catalogue.(Refer Page No:148) Aluminium cable (3.5 core) Armoured/unarmoured

Current Current 2 2 Rating in Rating in R/KM X/KM R /KM X /KM amps (In amps (In (ohm/km) (ohm/km) (ohm/km) (ohm/km) Air) ground)

Sl.no.

Cable sizes

1

400.00

542

426

0.1023

0.01

0.0700

0.0049

0.1842

2

300.00

461

375

0.1300

0.02

0.0710

0.0050

0.2228

3

240.00

402

333

0.1620

0.03

0.0720

0.0052

0.2689

4

185.00

339

287

0.2110

0.04

0.0720

0.0052

0.3408

5

150.00

294

255

0.2650

0.07

0.0720

0.0052

0.4217

6

120.00

258

227

0.3250

0.11

0.0720

0.0052

0.5127

7

95.00

221

199

3.9400

15.52

0.0070

6.1047

176

167

0.0059

0.8844

140

134

0.0061

1.2746

117

116

0.0064

1.7229

95

97

0.0064

2.3881

8 9 10 11

70.00 50.00 35.00 25.00

0.5670 0.8200 1.1100 1.5400

0.32 0.67 1.23 2.37

0.0837 0.0770 0.0780 0.0800 0.0800

V/A/Km

Source: KEI cable catalogue.(Refer Page No:153) Copper cable (4core) Armoured/unarmoured Armoured/unarmoured

Current Current Rating in Rating in R/KM X/KM R2/KM X2/KM amps amps (In (ohm/km) (ohm/km) (ohm/km) (ohm/km) (Air) ground)

Sl.no.

Cable sizes

1

400.00

677

528

0.0602

0.00

0.0700

0.0049

0.1324

2

300.00

588

472

0.0769

0.01

0.0710

0.0050

0.1525

3

240.00

515

421

0.0965

0.01

0.0720

0.0052

0.1780

4

185.00

434

366

0.1270

0.02

0.0052

0.2192

5

150.00

375

325

0.1590

0.03

0.0052

0.2646

6

120.00

330

292

0.1960

0.04

0.0052

0.3186

7

95.00

284

254

0.2470

0.06

0.0055

0.3953

230

213

0.0059

0.5413

181

175

0.0061

0.7739

148

148

0.0064

1.0450

122

125

0.0064

1.4447

90

97

0.0064

2.2798

8 9 10 11 12

70.00 50.00 35.00 25.00 16.00

0.3430 0.4950 0.6710 0.9300 1.4700

0.12 0.25 0.45 0.86 2.16

0.0720 0.0720 0.0720 0.0740 0.0770 0.0780 0.0800 0.0800 0.0800

V/A/Km