§75.601-3 — Short circuit protection; dual element fuses; current ratings; maximum values Dual element fuses having adequate current-interrupting capacity shall meet the requirements for short circuit protection of trailing cables as provided in §75.601, however, the current ratings of such devices shall not exceed the maximum values specified in this section:
| Conductor size (AWG or MGM) | Single conductor cable | Two conductor cable |
|---|
| Ampacity | Max. fuse rating | Ampacity | Max. fuse rating |
|---|
| 14 | | | 15 | 15 |
| 12 | | | 20 | 20 |
| 10 | | | 25 | 25 |
| 8 | 60 | 60 | 50 | 50 |
| 6 | 85 | 90 | 65 | 70 |
| 4 | 110 | 110 | 90 | 90 |
| 3 | 130 | 150 | 105 | 110 |
| 2 | 150 | 150 | 120 | 125 |
| 1 | 170 | 175 | 140 | 150 |
| 1/0 | 200 | 200 | 170 | 175 |
| 2/0 | 235 | 250 | 195 | 200 |
| 3/0 | 275 | 300 | 225 | 225 |
| 4/0 | 315 | 350 | 260 | 300 |
| 250 | 350 | 350 | 285 | 300 |
| 300 | 395 | 400 | 310 | 350 |
| 350 | 445 | 450 | 335 | 350 |
| 400 | 480 | 500 | 360 | 400 |
| 450 | 515 | 600 | 385 | 400 |
| 500 | 545 | 600 | 415 | 450 |