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

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