[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR75.324]

[Page 474]
 
                       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 D--Ventilation
 
Sec. 75.324  Intentional changes in the ventilation system.

    (a) A person designated by the operator shall supervise any 
intentional change in ventilation that--
    (1) Alters the main air current or any split of the main air current 
in a manner that could materially affect the safety or health of persons 
in the mine; or
    (2) Affects section ventilation by 9,000 cubic feet per minute of 
air or more in bituminous or lignite mines, or 5,000 cubic feet per 
minute of air or more in anthracite mines.
    (b) Intentional changes shall be made only under the following 
conditions:
    (1) Electric power shall be removed from areas affected by the 
ventilation change and mechanized equipment in those areas shall be shut 
off before the ventilation change begins.
    (2) Only persons making the change in ventilation shall be in the 
mine.
    (3) Electric power shall not be restored to the areas affected by 
the ventilation change and mechanized equipment shall not be restarted 
until a certified person has examined these areas for methane 
accumulation and for oxygen deficiency and has determined that the areas 
are safe.