Allowable Ampacities of Insulated Conductors • Rated Up to and Including 2000 Volts, 60°C through 90°C (140°F through 194°F).
• Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried).
• Based on Ambient Temperature of 30°C (86°F).
Conductor Size (AWG/KCMIL) |
60°C (140°F)
TW, UF |
75°C (167°F)
RHW, THHW, THW, THWN, XHHW, USE, ZW |
90°C (194°F)
TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, XHH, XHHW, XHHW-2, USE-2, ZW, PV |
14* |
- |
- |
- |
12* |
15 |
20 |
25 |
10* |
25 |
30 |
35 |
8 |
35 |
40 |
45 |
6 |
40 |
50 |
55 |
4 |
55 |
65 |
75 |
3 |
65 |
75 |
85 |
2 |
75 |
90 |
100 |
1 |
85 |
100 |
115 |
1/0 |
100 |
120 |
135 |
2/0 |
115 |
135 |
150 |
3/0 |
130 |
155 |
175 |
4/0 |
150 |
180 |
205 |
250 |
170 |
205 |
230 |
300 |
195 |
230 |
260 |
350 |
210 |
250 |
280 |
400 |
225 |
270 |
305 |
500 |
260 |
310 |
350 |
600 |
285 |
340 |
385 |
700 |
315 |
375 |
425 |
750 |
320 |
385 |
435 |
800 |
330 |
395 |
445 |
900 |
355 |
425 |
480 |
1000 |
375 |
445 |
500 |
* Unless specifically permitted in 240.4(E) through (G), the overcurrent protection shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper-clad aluminum after any correction factors for ambient temperature and number of conductors have been applied.
See the NEC for conductor ampacities, correction factors, and conditions of use.
Updated 1/4/2022