[Code of Federal Regulations] [Title 30, Volume 1] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 30CFR75.601-1] [Page 529] TITLE 30--MINERAL RESOURCES CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR PART 75_MANDATORY SAFETY STANDARDS_UNDERGROUND COAL MINES--Table of Contents Subpart G_Trailing Cables Sec. 75.601-1 Short circuit protection; ratings and settings of circuit breakers. 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: ------------------------------------------------------------------------ Maximum allowable circuit Conductor size AWG or MGM 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 ------------------------------------------------------------------------