[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: 30CFR27.21]



[Page 153-154]

 

                       TITLE 30--MINERAL RESOURCES

 

  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR

 

PART 27_METHANE-MONITORING SYSTEMS--Table of Contents

 

             Subpart B_Construction and Design Requirements

 

Sec.  27.21  Methane-monitoring system.



    (a) A methane-monitoring system shall be so designed that any 

machine or equipment, which is controlled by the system, cannot be 

operated unless the electrical components of the methane-monitoring 

system are functioning normally.

    (b) A methane-monitoring system shall be rugged in construction so 

that its operation will not be affected by vibration or physical shock, 

such as normally encountered in mining operations.

    (c) Insulating materials that give off flammable or explosive gases 

when decomposed shall not be used within enclosures where they might be 

subjected to destructive electrical action.

    (d) An enclosure shall be equipped with a lock, seal, or acceptable 

equivalent when MSHA deems such protection necessary for safety.

    (e) A component or subassembly of a methane-monitoring system shall 

be constructed as a package unit or otherwise in a manner acceptable to 

MSHA. Such components or subassemblies



[[Page 154]]



shall be readily replaceable or removable without creating an ignition 

hazard.

    (f) The complete system shall ``fail safe'' in a manner acceptable 

to MSHA.