[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: 30CFR7.67]

[Page 27-28]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 7--TESTING BY APPLICANT OR THIRD PARTY--Table of Contents
 
                 Subpart D--Multiple-Shot Blasting Units
 
Sec. 7.67  Construction test.

    The constuction test is to be performed on the blasting unit 
subsequent to the output energy test of Sec. 7.66.
    (a) Test procedures. (1) The blasting unit shall be dropped 20 times 
from a height of 3 feet onto a horizontal concrete floor. When dropped, 
the orientation of the blasting unit shall be varied each time in an 
attempt to have a different surface, corner, or edge strike the floor 
first for each drop.
    (2) After the blasting unit has been drop tested in accordance with 
paragraph (a)(1) above, it shall be submerged in 1 foot of water for 1 
hour in each of 3 tests. The water temperature shall be maintained 
within  5  deg.F (2.8  deg.C) of 40  deg.F (4.4 
deg.C), 70  deg.F (21.1  deg.C) and 100  deg.F (37.8  deg.C) during the 
tests.
    (3) Immediately after removing the blasting unit from the water at 
each temperature, the unit shall be operated first with the firing line 
terminals open circuited, then operated again with the firing line 
terminals short circuited, and last, the output energy tested in 
accordance with the output energy test of Sec. 7.66.
    (b) Acceptable performance. (1) The blasting unit shall meet the 
acceptable performance criteria of the output energy test in Sec. 7.66 
each time it is performed.
    (2) There shall be no damage to the firing line terminals that 
exposes an electric conductor.
    (3) The visual indicator shall be operational.
    (4) The batteries shall not be separated from the blasting unit.

[[Page 28]]

    (5) There shall be no water inside the blasting unit enclosure, 
except for the battery compartment.