Copper wire ampacity table


Ampacities of copper wire, in free air at 30o C:

======================================================== 
|                      INSULATION TYPE:                |
|         RUW, T           THW, THWN        FEP, FEPB  | 
|           TW               RUH            THHN, XHHW | 
======================================================== 
Size    Current Rating   Current Rating   Current Rating 
AWG     @ 60 degrees C   @ 75 degrees C   @ 90 degrees C 
======================================================== 
20 -------- *9 ----------------------------- *12.5 
18 -------- *13 ------------------------------ 18  
16 -------- *18 ------------------------------ 24  
14 --------- 25 ------------- 30 ------------- 35  
12 --------- 30 ------------- 35 ------------- 40  
10 --------- 40 ------------- 50 ------------- 55  
8 ---------- 60 ------------- 70 ------------- 80  
6 ---------- 80 ------------- 95 ------------ 105  
4 --------- 105 ------------ 125 ------------ 140  
2 --------- 140 ------------ 170 ------------ 190  
1 --------- 165 ------------ 195 ------------ 220  
1/0 ------- 195 ------------ 230 ------------ 260   
2/0 ------- 225 ------------ 265 ------------ 300  
3/0 ------- 260 ------------ 310 ------------ 350  
4/0 ------- 300 ------------ 360 ------------ 405  


* = estimated values; normally, wire gages this small are not manufactured with these insulation types.