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Ampacity Tables
N.E.C. Code Table

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NEC Code installations
*Ampacity at 75C conductor
temperature 30C ambient

Conductor
Size

600V

One to 3 Conductors
in Raceway, Cable
or Direct Burial

Single Conductor
in Free Air

AWG or
KCMIL

AMPERES

 

CU

AL

CU

AL

14......
12
......
10
......
8
......
6
......
4
......
2
......
1
......
1/0
......
2/0
......
3/0
......
4/0
......
250
......
300
......
350
......
400
......
500
......
600
......
700
......
750
......
800
......
900
......
1000
......
1250
......
1500
......
1750
......
2000
......

15......
20......
30
......
50
......
65
......
85
......
115
......
130
......
150
......
175
......
200
......
230
......
255
......
285
......
310
......
335
......
380
......
420
......
460
......
475
......
490
......
520
......
545
......
590
......
625
......
650
......
665
......

......
15
......
25
......
40
......
50
......
65
......
90
......
100
......
120
......
135
......
155
......
180
......
205
......
230
......
250
......
270
......
310
......
340
......
375
......
385
......
395
......
425
......
445
......
485
......
520
......
545
......
560
......

20.....
25
.....
40
.....
70
.....
95
.....
125
.....
170
.....
195
.....
230
.....
265
.....
310
.....
360
.....
405
.....
445
.....
505
.....
545
.....
620
.....
690
.....
755
.....
785
.....
815
.....
870
.....
935
.....
1065
.....
1175
.....
1280
.....
1385
.....

...
20
...
30
...
55
...
75
...
100
...
135
...
155
...
180
...
210
...
240
...
280
...
315
...
350
...
395
...
425
...
485
...
540
...
595
...
620
...
645
...
700
...
750
...
855
...
950
...
1050
...
1150
...

Correction factors for
room temperatures
over 30 (86F) ambient

40C.....104F
45C.....113F
50C.....122F
55C.....131F
60C.....140F
70C.....158F

.88
.82
.75
.67
.58
.33
.88
.82
.75
.67
.58
.33

 

*Ampacities are maximum allowed by the
National Electrical Code. Sizes of conductors
used on all normal electrical circuits in buildings
may be determined on the basis of N.E.C.
requirements taking into account voltage drop
and operating efficiency at lower conductor
temperature.

 


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