[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 641]
 
                       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 F_Electrical Equipment_General
 
Sec.  77.509  Transformers; installation and guarding.

    (a) Transformers shall be of the totally enclosed type, or shall be 
placed at least 8 feet above the ground, or installed in a transformer 
house, or surrounded by a substantial fence at least 6 feet high and at 
least 3 feet from any energized parts, casings, or wiring.
    (b) Transformer stations shall be enclosed to prevent persons from 
unintentionally or inadvertently contacting energized parts.
    (c) Transformer enclosures shall be kept locked against unauthorized 
entry.