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Amp Ratings for Copper Conductors
Allowable Ampacities of Insulated Conductors Not
More Than Three Conductors in Raceway, Cable or Earth (Direct Buried) Based
on Ambient Temperature of 30°C (86°F)
Copper
Temperature Rating of Conductor, See NEC Table 310-13
| |
60°C (140°F) |
75°C
(167°F) |
90°C
(194°F) |
Size
AWG
KCMIL |
Types
TW*, UF* |
Types
FEPW*, RH*, RHW*, THHW*, THW*, THWN*, XHHW*, USE*, ZW* |
Types
TA, TBS, SA, SIS, FEP*, MI, RHH*, RHW2, THHN*, THHW*, THW2, THWN2, USE2, XHH, XHHW*, XHHW2, ZW2 |
| 18 |
- |
- |
14 |
| 16 |
- |
- |
18 |
| 14 |
20* |
20* |
25* |
| 12 |
25* |
25* |
30* |
| 10 |
30 |
35* |
40* |
| 8 |
40 |
50 |
55 |
| 6 |
55 |
65 |
75 |
| 4 |
70 |
85 |
95 |
| 3 |
85 |
100 |
110 |
| 2 |
95 |
115 |
130 |
| 1 |
110 |
130 |
150 |
| 1/0 |
125 |
150 |
170 |
| 2/0 |
145 |
175 |
195 |
| 3/0 |
165 |
200 |
225 |
| 4/0 |
195 |
230 |
260 |
| 250 |
215 |
255 |
290 |
| 300 |
240 |
285 |
320 |
| 350 |
260 |
310 |
350 |
| 400 |
280 |
335 |
380 |
| 500 |
320 |
380 |
430 |
| 600 |
355 |
420 |
475 |
| 700 |
385 |
460 |
520 |
| 750 |
400 |
475 |
535 |
| 800 |
410 |
490 |
555 |
| 900 |
435 |
520 |
585 |
| 1000 |
455 |
545 |
615 |
| 1250 |
495 |
590 |
665 |
| 1500 |
520 |
625 |
705 |
| 1750 |
545 |
650 |
735 |
| 2000 |
560 |
665 |
750 |
* Over-current protection shall not exceed 15 amperes for #14 AWG, 20 amperes for #12 AWG and 30 amperes for #10 AWG copper, after any correction factors for ambient temperature and number of conductors have been applied.
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