[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 647]
 
                       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.  77.803  Fail safe ground check circuits on high-voltage resistance 
grounded systems.

    On and after September 30, 1971, all high-voltage, resistance 
grounded systems shall include a fail safe ground check circuit or other 
no less effective device approved by the Secretary to monitor 
continuously the grounding circuit to assure continuity. The fail safe 
ground check circuit shall cause the circuit breaker to open when either 
the ground or ground check wire is broken.