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 |