[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 644]
 
                       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 H_Grounding
 
Sec.  77.704-1  Work on high-voltage lines.

    (a) No high-voltage line shall be regarded as deenergized for the 
purpose of performing work on it, until it has been determined by a 
qualified person (as provided in Sec.  77.103) that such high-voltage 
line has been deenergized and grounded. Such qualified person shall by 
visual observation (1) determine that the disconnecting devices on the 
high-voltage circuit are in open position, and (2) insure that each 
ungrounded conductor of the high-voltage circuit upon which work is to 
be done is properly connected to the system grounding medium. In the 
case of resistance grounded or solid wye-connected systems, the neutral 
wire is the system grounding medium. In the case of an ungrounded power 
system, either the steel armor or conduit enclosing the system or a 
surface grounding field is a system grounding medium;
    (b) No work shall be performed on any high-voltage line which is 
supported by any pole or structure which also supports other high-
voltage lines until: (1) All lines supported on the pole or structure 
are deenergized and grounded in accordance with all of the provisions of 
this Sec.  77.704-1 which apply to the repair of deenergized surface 
high-voltage lines; or (2) the provisions of Sec. Sec.  77.704-2 through 
77.704-10 have been complied with, with respect to all energized lines, 
which are supported on the pole or structure.
    (c) Work may be performed on energized surface high-voltage lines 
only in accordance with the provisions of Sec. Sec.  77.704-2 through 
77.704-10, inclusive.