30 CFR 75.601-1 – Short circuit protection; ratings and settings of circuit breakers
Current as of: 2024 | Check for updates
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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:
| 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 |