[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 648]
 
                       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.  77.808  Disconnecting devices.

    Disconnecting devices shall be installed at the beginning of each 
branch line in high-voltage circuits and they shall be equipped or 
designed in such a manner that it can be determined by visual 
observation that the circuit is deenergized when such devices are open.