[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: 30CFR33.31]

[Page 157]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 33--DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL MINES--Table of Contents
 
                      Subpart C--Test Requirements
 
Sec. 33.31  Test space.

    (a) Drilling tests shall be conducted in a test space formed by two 
curtains suspended across a mine opening in such a manner that the 
volume of the test space shall be approximately 2,000 cubic feet.
    (b) No mechanical ventilation shall be provided in the test space 
during a drilling test, except such air movement as may be induced by 
operation of drilling- or dust-collecting equipment.
    (c) All parts of a unit or system shall be within the test space 
during a drilling test.