[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 643]
 
                       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.  77.701-3  Grounding wires; capacity.

    Where grounding wires are used to ground metallic sheaths, armors, 
conduits, frames, casings, and other metallic enclosures, such grounding 
wires will be approved if:
    (a) Where the power conductor used is No. 6 A.W.G., or larger, the 
cross-sectional area of the grounding wire is at least one-half the 
cross-sectional area of the power conductor.
    (b) Where the power conductor used is less than No. 6 A.W.G., the 
cross-sectional area of the grounding wire is equal to the cross-
sectional area of the power conductor.