30 CFR § 75.601-1
Short circuit protection; ratings and settings of circuit breakers
July 29, 2020
Circuit breakers providing short circuit protection for trailing cables shall be set so as not to exceed the maximum allowable instantaneous settings specified in this section; however, higher settings may be permitted by an authorized representative of the Secretary when he has determined that special applications are justified:
Open Table
| Conductor size AWG or MGM | Maximum allowable circuit breaker instantaneous setting (amperes) |
|---|---|
| 14 | 50 |
| 12 | 75 |
| 10 | 150 |
| 8 | 200 |
| 6 | 300 |
| 4 | 500 |
| 3 | 600 |
| 2 | 800 |
| 1 | 1,000 |
| 1/0 | 1,250 |
| 2/0 | 1,500 |
| 3/0 | 2,000 |
| 4/0 | 2,500 |
| 250 | 2,500 |
| 300 | 2,500 |
| 350 | 2,500 |
| 400 | 2,500 |
| 450 | 2,500 |
| 500 | 2,500 |
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