[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: 30CFR75.331]

[Page 477]
 
                       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. 75.331  Auxiliary fans and tubing.

    (a) When auxiliary fans and tubing are used for face ventilation, 
each auxiliary fan shall be--
    (1) Permissible, if the fan is electrically operated;
    (2) Maintained in proper operating condition;
    (3) Deenergized or shut off when no one is present on the working 
section; and
    (4) Located and operated to avoid recirculation of air.
    (b) If a deficiency exists in any auxiliary fan system, the 
deficiency shall be corrected or the auxiliary fan shall be deenergized 
immediately.
    (c) If the air passing through an auxiliary fan or tubing contains 
1.0 percent or more methane, power to electrical equipment in the 
working place and to the auxiliary fan shall be deenergized, and other 
mechanized equipment in the working place shall be shut off until the 
methane concentration is reduced to less than 1.0 percent.
    (d) When an auxiliary fan is stopped--
    (1) Line brattice or other face ventilation control devices shall be 
used to maintain ventilation to affected faces; and
    (2) Electrical equipment in the affected working places shall be 
disconnected at the power source, and other mechanized equipment shall 
be shut off until ventilation to the working place is restored.