 |
|
COPPER WIRE AMPACITY
National Electric Code
[printer version]
|
Allowable
Ampacities of Insulated Conductors Rated 0 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.
See Table 310-13
|
|
|
60°
(140° F)
|
75°
(167° F)
|
90°
(194° F)
|
|
AWG
kcmil
|
TYPES
TW±, UF±
|
TYPES
FEPW±
RH±, RHW±
THHW±, THW±
THWN±, XHHW±
USE±, ZW±
|
TYPES
TBS, SA, SIS, FEP±
FEPB±, RHH±
RHW-2, THHN±
THHW±
|
|
|
|
18
16
14
12
10
8
|
20±
25±
30
40
|
20±
25±
35
50
|
14
18
25±
30±
40±
55
|
|
6
4
3
2
1
|
55
70
85
95
110
|
65
85
100
115
130
|
75
95
110
130
150
|
|
1/0
2/0
3/0
4/0
250
300
350
400
500
|
125
145
165
195
215
240
260
280
320
|
150
175
200
230
255
285
310
335
380
|
170
195
225
260
290
320
350
380
430
|
|
600
700
750
800
900
|
355
385
400
410
435
|
420
460
475
490
520
|
475
520
535
555
585
|
|
1000
1250
1500
1750
2000
|
455
495
520
545
560
|
545
590
625
650
665
|
615
665
705
735
750
|
|
|
|
Ambient Temp. C
|
For ambient temperatures
other than 30° C (86° F), multiply he allowable ampacities shown above by the
appropriate factor shown below.
|
|
21-25
26-30
31-35
36-40
41-45
46-50
51-55
56-60
61-70
71-80
|
1.08
1.00
.91
.82
.71
.58
.41
|
1.05
1.00
.94
.88
.82
.75
.67
.58
.33
|
1.04
1.00
.96
.91
.87
.76
.71
.58
.41
|
|
±
Unless otherwise specifically permitted elsewhere in this Code, the
overcurrent protection for conductor types marked with an obelisk (±) shall
not exceed 15 amperes for No. 14-20 amperes for No. 12 and 30 amperes for
No. 10: or 15 amperes for No. 12 and 25 amperes for No. 10 aluminum and
copper-clad aluminum after any correction factors for ambient temperature
and number of conductors have been applied.
|
|
Ref. NEC Table 310-16
ALUMINUM WIRE AMPACITY
National Electric Code
[printer version]
|
Allowable
Ampacities of Insulated Conductors Rated 0 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.
See Table 310-13
|
|
60°
(140° F)
|
75°
(167° F)
|
90°
(194° F)
|
|
|
TYPES
TW±, UF±
|
TYPES
RH±, RHW±,
THHW±, XHHW±
USE±
THW±
THWN±
|
TYPES
TBS, SA, SIS,
THHN±, THHW±
THW2, THWN-2
RHH±, RHW-2,
USE-2,
XHH, XHHW
XHHW-2, ZW-2
|
AWG
kcmil
|
|
ALUMINUM OR COPPER-CLAD ALUMINUM
|
|
|
...
...
...
20±
25
30
|
...
...
...
20±
30±
40
|
...
...
...
25±
35±
45
|
...
...
...
12
10
8
|
|
40
55
65
75
85
|
50
65
75
90
100
|
60
75
85
100
115
|
6
4
3
2
1
|
|
100
115
130
150
170
190
210
225
260
|
120
135
155
180
205
230
250
270
310
|
135
150
175
205
230
255
380
305
350
|
1/0
2/0
3/0
4/0
250
300
350
400
500
|
|
285
310
320
330
355
|
340
375
385
395
425
|
385
420
435
450
480
|
600
700
750
800
900
|
|
375
405
435
455
470
|
445
485
520
545
560
|
500
545
585
615
630
|
1000
1250
1500
1750
2000
|
|
|
|
Ambient Temp. C
|
For ambient temperatures
other than 30° C (86° F), multiply he allowable ampacities shown above by the
appropriate factor shown below.
|
|
70-77
78-86
87-95
96-104
105-113
114-122
123-131
132-140
141-158
159-176
|
1.08
1.00
.91
.82
.71
.58
.41
...
...
...
|
1.05
1.00
.94
.88
.82
.75
.67
.58
.33
...
|
1.04
1.00
.96
.91
.87
.82
.76
.71
.58
.41
|
|
±
Unless otherwise specifically permitted elsewhere in this Code, the
overcurrent protection for conductor types marked with an obelisk (±) shall
not exceed 15 amperes for No. 14-20 amperes for No. 12 and 30 amperes for
No. 10: or 15 amperes for No. 12 and 25 amperes for No. 10 aluminum and
copper-clad aluminum after any correction factors for ambient temperature and
number of conductors have been applied.
|
|
Ref. NEC Table 310-16
|
|
