30 CFR § 75.601-3
Short circuit protection; dual element fuses; current ratings; maximum values
July 29, 2020
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:
Open Table
| 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 |
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