Conductor Ampacity Based on the 2017 National Electrical Code®

Ampacity based on NEC® Table 310.15(B)(16) (formerly Table 310.16) Allowable Ampacities of Insulated Conductors Rated Up to and Including 2000 Volts, 60° through 90°C (140° through 194°F), Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F).*

NOTE: For conduit fill, see 2017 NEC Annex C. For information on temperature ratings of terminations to equipment, see NEC 110.14(C).
Size Temperature Rating of Conductor. (See Table 310.104(A).) Size
AWG or kcmil 60°C (140°F) 75°C (167°F)

90°C (194°F)

60°C (140°F)

75°C (167°F)

90°C (194°F)

AWG or kcmil
Types TW, UF Types RHW, THHW, THW, THWN, XHHW, USE, ZW Types TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, USE-2, XHH, XHHW, XHHW-2, ZW-2 Types TW, UF Types RHW, THHW, THW, THWN, XHHW, USE Types TBS, SA, SIS, THHN, THHW, THW-2, THWN-2, RHH, RHW-2, USE-2, XHH, XHHW, XHHW-2, ZW-2
Copper Aluminum or Copper-Clad Aluminum

18*

16*

14 *

12 *

10 *

8

15

20

30

40

20

25

35

50

14

18

25

30

40

55

15

25

35

20

30

40

25

35

45

12 *

10 *

8

6

4

3

2

1

55

70

85

95

110

65

85

100

115

130

75

95

115

130

145

40

55

65

75

85

50

65

75

90

100

55

75

85

100

115

6

4

3

2

1

1/0

2/0

3/0

4/0

125

145

165

195

150

175

200

230

170

145

165

195

100

115

130

150

120

135

155

180

135

150

175

205

1/0

2/0

3/0

4/0

250

300

350

400

500

215

240

260

280

320

255

285

310

335

380

290

320

350

380

430

170

195

210

225

260

205

230

250

270

310

230

260

280

305

350

250

300

350

400

500

600

700

750

800

900

350

385

400

410

435

420

460

475

490

520

475

520

535

555

585

285

315

320

330

355

340

375

385

395

425

385

425

435

445

480

600

700

750

800

900

1000

1250

1500

1750

2000

455

495

525

545

555

545

590

625

650

655

615

665

705

735

750

375

405

435

455

470

445

485

520

545

560

500

545

585

615

630

1000

1250

1500

1750

2000

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