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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
* 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.
Page 32
© 2006, ADC Telecommunications, Inc.
(Directly Buried), Based on Ambient Temperature of 30°C (86°F)
SIZE
AWG
60°C
KCMIL
(114°F)
TYPES
TW*,
UF*
500
320
600
355
700
385
750
400
800
410
900
435
1000
455
1250
495
1500
520
1750
545
2000
560
CORRECTION FACTORS
For ambient temperatures other than 30C (86F), multiply
the allowable ampacities shown by the appropriate factor shown below.
21-25
1.08
26-30
1.00
31-35
.91
36-40
.82
41-45
.71
46-50
.58
51-55
.41
56-60
....
61-70
....
71-80
....
TEMPERATURE RATING OF CONDUCTOR
60°C
(114°F)
TYPES
FEPW*,
RH*, RHW*,
THHW*,
THW*,
THWN*,
XHHW*,
USE*, ZW*
380
420
460
335
490
520
545
590
625
650
665
1.05
1.00
.94
.88
.82
.75
.67
.58
.33
....
60°C
(114°F)
TYPES
TBS, SA,
SIS, FEP*,
FEPB*, MI,
RHH*, RHW-2,
THHN*,
THHW*, THW-2*,
THWN-2*,
USE-2,
XHH,
XHHW*
XHHW-2
ZW-2
430
475
520
380
555
585
615
665
705
735
750
1.04
1.00
.96
.91
.87
.82
.76
.71
.58
.41
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