[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR77]

[Page 646]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 77_MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK 
AREAS OF UNDERGROUND COAL MINES--Table of Contents
 
               Subpart I_Surface High-Voltage Distribution
 
Sec.  77.800-1  Testing, examination, and maintenance of circuit 
breakers; procedures.

    (a) Circuit breakers and their auxiliary devices protecting high-
voltage circuits to portable or mobile equipment shall be tested and 
examined at least once each month by a person qualified as provided in 
Sec.  77.103.
    (b) Tests shall include:
    (1) Breaking continuity of the ground check conductor where ground 
check monitoring is used; and,
    (2) Actuating any of the auxiliary protective relays.
    (c) Examination shall include visual observation of all components 
of the circuit breaker and its auxiliary devices, and such repairs or 
adjustments as are indicated by such tests and examinations shall be 
carried out immediately.