Handbook of Electrical Tables and Design Criteria

Fault-Current Calculations with Short-Circuit Tables and Data-Continued

Single-Phase L-N Fault-Current Tables-Continued

Short-Circuit Tables and Data: 480 Volts Three-Phase

Three-Phase Bolted Fault-Current [*] Table
One-Way Distance in Feet
Available Isc in Thousands (Isca)

5

10

15

20

25

30

40

50

60

70

80

90

100

125

150

175

200

225

250

300

350

400

500

600

1

956

915

878

844

812

782

729

683

642

606

574

545

519

463

418

381

350

324

301

264

235

212

177

152

3

2,634

2,347

2,117

1,927

1,769

1,635

1,420

1,255

1,124

1,018

930

856

793

670

580

511

457

413

377

321

279

247

201

170

5

4,059

3,416

2,949

2,594

2,315

2,091

1,751

1,506

1,322

1,177

1,061

966

887

736

628

548

487

437

397

335

290

256

207

173

10

6,832

5,188

4,182

3,502

3,013

2,644

2,123

1,774

1,523

1,335

1,188

1,070

973

794

671

580

511

457

413

347

299

262

211

177

15

8,846

6,273

4,859

3,965

3,349

2,899

2,285

1,885

1,605

1,397

1,236

1,109

1,006

816

686

592

520

464

419

351

302

265

213

178

20

10,376

7,005

5,287

4,246

3,547

3,046

2,375

1,946

1,649

1,430

1,263

1,130

1,023

827

694

598

525

468

422

353

303

266

213

178

25

11,577

7,532

5,582

4,434

3,678

3,142

2,433

1,985

1,676

1,451

1,279

1,143

1,033

834

699

601

528

470

424

354

304

267

214

178

30

12,545

7,931

5,798

4,569

3,770

3,209

2,473

2,012

1,695

1,465

1,290

1,152

1,041

838

702

604

530

472

425

355

305

267

214

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