[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

------------------------------------------------------------------------