[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 649]
 
                       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 J_Low- and Medium-Voltage Alternating Current Circuits
 
Sec.  77.902-2  Approved ground check systems not employing pilot check 
wires.

    Ground check systems not employing pilot check wires shall be 
approved by the Secretary only after it has been determined that the 
system includes a fail safe design causing the circuit breaker to open 
when ground continuity is broken.