30 C.F.R. § 75.601-1 Short circuit protection; ratings and settings of circuit breakers.
Title 30 - Mineral Resources
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:
Title 30: Mineral Resources
PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES
Subpart G—Trailing Cables
§ 75.601-1 Short circuit protection; ratings and settings of circuit breakers.
------------------------------------------------------------------------ Maximum allowable circuit Conductor size AWG or MGM breaker instantaneous setting (amperes)------------------------------------------------------------------------14....................................................... 5012....................................................... 7510....................................................... 1508........................................................ 2006........................................................ 3004........................................................ 5003........................................................ 6002........................................................ 8001........................................................ 1,0001/0...................................................... 1,2502/0...................................................... 1,5003/0...................................................... 2,0004/0...................................................... 2,500250...................................................... 2,500300...................................................... 2,500350...................................................... 2,500400...................................................... 2,500450...................................................... 2,500500...................................................... 2,500------------------------------------------------------------------------
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