| CURRENT-CARRYING CAPACITY IN AMPS (copper at 75°C) (Note 3) |
WIRE SIZE (AWG OR kcmil) |
CONDUIT SIZE |
| THHN/THWN/THW |
ø |
E.G |
2C + E.G |
3C + E.G |
4C + E.G |
| 25* |
12 |
12 |
1/2 |
1/2 |
1/2 |
1/2 |
1/2 |
1/2 |
| 35* |
10 |
10 |
1/2 |
1/2 |
1/2 |
1/2 |
1/2 |
3/4 |
| 50 |
8 |
10 |
1/2 |
1/2 |
3/4 |
3/4 |
3/4 |
3/4 |
| 65 |
6 |
8 |
3/4 |
3/4 |
1 |
1 |
1 |
1 1/4 |
| 85 |
4 |
8 |
1 |
1 |
1 |
1 1/4 |
1 1/4 |
1 1/4 |
| 100 |
3 |
6 |
1 |
1 |
1 1/4 |
1 1/4 |
1 1/4 |
1 1/2 |
| 115 |
2 |
6 |
1 |
1 1/4 |
1 1/4 |
1 1/4 |
1 1/4 |
1 1/2 |
| 130 |
1 |
6 |
1 1/4 |
1 1/4 |
1 1/4 |
1 1/2 |
1 1/2 |
2 |
| 150 |
1/0 |
6 |
1 1/4 |
1 1/4 |
1 1/2 |
1 1/2 |
2 |
2 |
| 175 |
2/0 |
6 |
1 1/2 |
1 1/2 |
1 1/2 |
2 |
2 |
2 |
| 200 |
3/0 |
6 |
1 1/2 |
1 1/2 |
2 |
2 |
2 |
2 1/2 |
| 230 |
4/0 |
4 |
2 |
2 |
2 |
2 |
2 1/2 |
2 1/2 |
| 255 |
250 |
4 |
2 |
2 |
2 1/2 |
2 1/2 |
2 1/2 |
3 |
| 285 |
300 |
4 |
2 |
2 1/2 |
2 1/2 |
2 1/2 |
3 |
3 |
| 310 |
350 |
2 |
2 1/2 |
2 1/2 |
2 1/2 |
3 |
3 |
3 |
| 335 |
400 |
2 |
2 1/2 |
2 1/2 |
3 |
3 |
3 |
3 |
| 380 |
500 |
2 |
3 |
3 |
3 |
3 |
3 1/2 |
3 1/2 |
| 475 |
700 |
2 |
3 |
3 |
3 1/2 |
3 1/2 |
4 |
4 1/2 |
|
|
|
|
|
|
|
|
|
| Notes: |
|
|
|
|
|
|
|
|
|
E.G (means Equipment Ground) # = Phase } Conduit size |
|
|
|
|
|
|
|
|
|
| 1 |
Where the circuit protective device rating is higher than the conductor current capacity, the equipment ground conductor must be sized according to NEC Table 250.122. Example would be a feeder for a group of motors or for a panel with a large numbers of motors. |
| 2 |
Where parallel runs are used, the equpment ground conductor in each run must be sized according to the circuit protective device rating in NEC Table 250.122. |
| 3 |
Use correction factors listed in NEC Table 310.16 for ambient temparatures other than 30°C (86°F). |
|
**NEC 240.4(D) overcurrent protection shall not exceed 20 amps for #12 AWG and 30 amps for #10 AWG. |
Loading... Please wait...