[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: 30CFR74.10]

[Page 447]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 74--COAL MINE DUST PERSONAL SAMPLER UNITS--Table of Contents
 
Sec. 74.10  Changes after certification.

    (a) If the applicant desires to change any feature of a certified 
coal mine dust personal sampler unit, he shall first obtain the approval 
of the National Institute for Occupational Safety and Health pursuant to 
the following procedures:
    (1) Application shall be made as for an original certificate of 
approval, requesting that the existing certification be extended to 
encompass the proposed change. The application shall be accompanied by 
drawings, specifications and related material, as in the case of an 
original application.
    (2) The application and accompanying material will be examined by 
the National Institute for Occupational Safety and Health to determine 
whether testing of the modified sampler unit or components will be 
required. Testing will be necessary if there is a possibility that the 
modification may affect the performance of the sampler unit adversely. 
The National Institute for Occupational Safety and Health will inform 
the applicant whether such testing is required.
    (3) If the proposed modification meets the pertinent requirements of 
these regulations, a formal extension of certification will be issued, 
accompanied by a list of new and revised drawings and specifications to 
be added to those already on file as the basis for the extension of 
certification.
    (b) If a change is proposed in a pump unit of a certified coal dust 
personal sampler unit, the approval of MSHA with respect to intrinsic 
safety shall be obtained in accordance with the procedures set forth in 
paragraph (a) of this section.

[35 FR 4326, Mar. 11, 1970, as amended at 37 FR 26712, Dec. 15, 1972]