GroundRules
30 CFR 75.601-1: -1 Short circuit protection; ratings and settings of circuit breakers.
Where this section sits in the code
- Title 30—Mineral Resources
- CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
- SUBCHAPTER O—COAL MINE SAFETY AND HEALTH
- PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES
- Subpart G—Trailing Cables
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
Collected 2026-08-27T02:25:24Z. Source file · JSON