Copper wire ampacity table CONDUCTOR AND INSULATOR TABLES

Ampacities of copper wire, in free air at 30^o 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.

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