§ 867. — Grounding of equipment.
[Laws in effect as of January 24, 2002]
[Document not affected by Public Laws enacted between
January 24, 2002 and December 19, 2002]
[CITE: 30USC867]
TITLE 30--MINERAL LANDS AND MINING
CHAPTER 22--MINE SAFETY AND HEALTH
SUBCHAPTER III--INTERIM MANDATORY SAFETY STANDARDS FOR UNDERGROUND COAL
MINES
Sec. 867. Grounding of equipment
(a) Metallic enclosed power conductors; metallic frames and other
equipment; methods
All metallic sheaths, armors, and conduits enclosing power
conductors shall be electrically continuous throughout and shall be
grounded by methods approved by an authorized representative of the
Secretary. Metallic frames, casings, and other enclosures of electric
equipment that can become ``alive'' through failure of insulation or by
contact with energized parts shall be grounded by methods approved by an
authorized representative of the Secretary. Methods other than grounding
which provide no less effective protection may be permitted by the
Secretary or his authorized representative.
(b) Frames of offtrack direct current machines; enclosures of related
detached components
The frames of all offtrack direct current machines and the
enclosures of related detached components shall be effectively grounded,
or otherwise maintained at no less safe voltages, by methods approved by
an authorized representative of the Secretary.
(c) Stationary high-voltage equipment powered by underground delta
systems
The frames of all stationary high-voltage equipment receiving power
from ungrounded delta systems shall be grounded by methods approved by
an authorized representative of the Secretary.
(d) Repairs of high-voltage lines; exceptions
High-voltage lines, both on the surface and underground, shall be
deenergized and grounded before work is performed on them, except that
repairs may be permitted, in the case of energized surface high-voltage
lines, if such repairs are made by a qualified person in accordance with
procedures and safeguards, including, but not limited to a requirement
that the operator of such mine provide, test, and maintain protective
devices in making such repairs, to be prescribed by the Secretary prior
to the operative date of this subchapter.
(e) Deenergizing of underground power circuits on idle days; exceptions
When not in use, power circuits underground shall be deenergized on
idle days and idle shifts, except that rectifiers and transformers may
remain energized.
(Pub. L. 91-173, title III, Sec. 307, Dec. 30, 1969, 83 Stat. 780.)
References in Text
For the operative date of this subchapter, referred to in subsec.
(d), see section 509 of Pub. L. 91-173, set out as an Effective Date
note under section 801 of this title.
Section Referred to in Other Sections
This section is referred to in section 861 of this title.
