ADCP-80-526 • Issue 6 • December 2006

Table 310-16 (NEC): Allowable Ampacities of Insulated Conductors, Rated O Through 2000 Volts, 60° to 90°C (140° to 194°F), Not More Than Three Current-Carrying Conductors in Raceway or Cable or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F)

SIZE

 

TEMPERATURE RATING OF CONDUCTOR

AWG

60°C

 

60°C

60°C

KCMIL

(114°F)

 

(114°F)

(114°F)

 

 

 

 

TYPES

 

 

 

 

TBS, SA,

 

 

 

 

SIS, FEP*,

 

 

 

 

FEPB*, MI,

 

 

 

 

RHH*, RHW-2,

 

 

 

TYPES

THHN*,

 

 

 

THHW*, THW-2*,

 

 

 

FEPW*,

 

 

 

THWN-2*,

 

 

 

RH*, RHW*,

 

 

 

THHW*,

USE-2,

 

 

 

THW*,

XHH,

 

TYPES

 

THWN*,

XHHW*

 

 

XHHW*,

XHHW-2

 

TW*,

 

 

UF*

 

USE*, ZW*

ZW-2

500

320

 

380

430

 

 

 

 

 

600

355

 

420

475

 

 

 

 

 

700

385

 

460

520

 

 

 

 

 

750

400

 

335

380

 

 

 

 

 

800

410

 

490

555

 

 

 

 

 

900

435

 

520

585

 

 

 

 

 

1000

455

 

545

615

 

 

 

 

 

1250

495

 

590

665

 

 

 

 

 

1500

520

 

625

705

 

 

 

 

 

1750

545

 

650

735

 

 

 

 

 

2000

560

 

665

750

 

 

 

 

 

CORRECTION FACTORS

For ambient temperatures other than 30C (86F), multiply

the allowable ampacities shown by the appropriate factor shown below.

21-25

1.08

1.05

1.04

 

 

 

 

26-30

1.00

1.00

1.00

 

 

 

 

31-35

.91

.94

.96

 

 

 

 

36-40

.82

.88

.91

 

 

 

 

41-45

.71

.82

.87

 

 

 

 

46-50

.58

.75

.82

 

 

 

 

51-55

.41

.67

.76

 

 

 

 

56-60

....

.58

.71

 

 

 

 

61-70

....

.33

.58

 

 

 

 

71-80

....

....

.41

 

 

 

 

*Unless otherwise specifically permitted in the code, as defined in the NEC document cited (ANSI/NEC 70), the overcurrent protection for conductor types marked with an asterisk (*) shall not exceed 15 amperes for No. 14, 20 amperes for No. 12, and 30 amperes for No. 10 copper, after any correction factors for ambient temperature and number of conductors have been applied.

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© 2006, ADC Telecommunications, Inc.