Compare size below with size left of double line and use largest size
| 50 | 75 | 100 | 125 | 150 | 175 | 200 | 225 | 250 | 275 | 300 | 350 | 400 | 450 | 500 | 550 | 600 | 650 | 700 |
| | | | | | | | | | | | | | | | | | | |
| 14 | 14 | 14 | 14 | 12 | 12 | 12 | 10 | 10 | 10 | 10 | 8 | 8 | 8 | 8 | 8 | 6 | 6 | 6 |
| 14 | 14 | 12 | 12 | 12 | 12 | 10 | 10 | 8 | 8 | 8 | 8 | 6 | 6 | 6 | 6 | 6 | 4 | 4 |
| 14 | 12 | 12 | 10 | 10 | 8 | 8 | 8 | 8 | 8 | 6 | 6 | 6 | 4 | 4 | 4 | 4 | 4 | 3 |
| 12 | 10 | 10 | 8 | 8 | 8 | 6 | 6 | 6 | 6 | 4 | 4 | 4 | 4 | 3 | 3 | 2 | 2 | 2 |
| 12 | 10 | 8 | 8 | 6 | 6 | 6 | 4 | 4 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 0 |
| | | | | | | | | | | | | | | | | | | |
| 10 | 8 | 8 | 6 | 6 | 6 | 4 | 4 | 4 | 4 | 3 | 2 | 2 | 1 | 1 | 1 | 0 | 0 | 0 |
| 10 | 8 | 6 | 6 | 4 | 4 | 4 | 4 | 3 | 3 | 2 | 2 | 1 | 1 | 0 | 0 | 00 | 00 | 00 |
| 8 | 8 | 6 | 6 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 1 | 0 | 0 | 0 | 00 | 00 | 000 | 000 |
| 8 | 6 | 6 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 1 | 0 | 0 | 0 | 00 | 00 | 000 | 000 | 4/0 |
| 8 | 6 | 4 | 4 | 4 | 3 | 2 | 2 | 1 | 1 | 1 | 0 | 00 | 00 | 000 | 000 | 000 | 4/0 | 4/0 |
| 8 | 6 | 4 | 4 | 3 | 2 | 2 | 1 | 1 | 1 | 0 | 0 | 00 | 000 | 000 | 000 | 4/0 | 4/0 | 250 |
| | | | | | | | | | | | | | | | | | | |
| 6 | 4 | 4 | 3 | 2 | 2 | 1 | 1 | 0 | 0 | 00 | 00 | 000 | 000 | 4/0 | 4/0 | 250 | 250 | 300 |
| 6 | 4 | 3 | 2 | 2 | 1 | 0 | 0 | 0 | 00 | 00 | 000 | 4/0 | 4/0 | 250 | 250 | 300 | 300 | 300 |
| 6 | 4 | 3 | 2 | 1 | 0 | 0 | 00 | 00 | 00 | 000 | 4/0 | 4/0 | 250 | 250 | 300 | 300 | 350 | 350 |
| 4 | 4 | 2 | 1 | 1 | 0 | 00 | 00 | 000 | 000 | 000 | 4/0 | 250 | 250 | 300 | 300 | 350 | 400 | 400 |
| 4 | 3 | 2 | 1 | 0 | 0 | 00 | 000 | 000 | 000 | 4/0 | 250 | 250 | 300 | 350 | 350 | 400 | 400 | 500 |
| | | | | | | | | | | | | | | | | | | |
| 4 | 3 | 1 | 0 | 0 | 00 | 000 | 000 | 4/0 | 4/0 | 4/0 | 250 | 300 | 350 | 350 | 400 | 500 | 500 | 500 |
| 4 | 2 | 1 | 0 | 00 | 000 | 000 | 4/0 | 4/0 | 250 | 250 | 300 | 350 | 400 | 400 | 500 | 500 | 600 | 600 |
| 3 | 1 | 0 | 00 | 000 | 000 | 4/0 | 4/0 | 250 | 250 | 300 | 350 | 400 | 500 | 500 | 500 | 600 | 600 | 700 |
| 2 | 1 | 0 | 00 | 000 | 4/0 | 250 | 250 | 300 | 300 | 350 | 400 | 500 | 500 | 600 | 600 | 700 | 700 | 750 |
| 2 | 0 | 00 | 000 | 4/0 | 250 | 250 | 300 | 350 | 350 | 400 | 500 | 500 | 600 | 700 | 700 | 750 | 800 | 900 |
Procedure: Find the amperage in the left column and the length of run along the top of the table (if between two of the table values go to the higher value). Where the two intersect on the table is the recommended wire size that will keep voltage drop within acceptable limits. Compare the recommended value on the right side of the table to the value shown on left side (minimum NEC requirements for the insulation type to be used) and use the larger size.