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: 277 Volts Single-Phase L-N

Single-Phase L-N 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

1,317

1,173

1,058

963

884

817

710

627

562

509

465

428

396

335

290

255

228

206

188

160

140

124

101

85

3

3,174

2,452

1,997

1,685

1,457

1,284

1,037

869

749

657

586

528

481

393

333

288

254

227

206

173

149

131

105

88

5

4,422

3,135

2,429

1,982

1,674

1,449

1,142

942

802

698

618

554

503

408

343

296

260

232

209

175

151

132

106

89

10

6,271

3,964

2,898

2,284

1,884

1,604

1,236

1,005

847

732

645

576

520

419

351

302

265

236

212

177

152

133

107

89

15

7,286

4,347

3,097

2,406

1,967

1,663

1,271

1,028

863

744

654

583

526

423

354

304

266

237

213

178

153

134

107

89

20

7,928

4,567

3,208

2,472

2,011

1,694

1,289

1,040

872

750

659

587

529

425

355

305

267

238

214

179

153

134

107

90

25

8,370

4,711

3,278

2,513

2,038

1,714

1,300

1,047

877

754

662

589

531

426

356

305

267

238

214

179

153

134

107

90

30

8,694

4,812

3,326

2,542

2,057

1,727

1,308

1,052

880

757

664

591

532

427

356

306

268

238

214

179

153

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