30 U.S.C. § 867 — Grounding of equipment
submitted 57 years ago by Pub. L. 91-173 to r/title-30-MINERAL-LANDS-AND-MINING · 304 words · no verdicts yet
This section requires grounding of electrical equipment and safe handling of high-voltage lines and underground circuits.
(a) Metal sheaths, armor, and conduits around power conductors must be electrically continuous throughout and grounded by methods approved by the Secretary’s authorized representative. Metal frames, casings, and other enclosures that could become electrically “alive” because insulation fails or they contact energized parts must also be grounded by approved methods. The Secretary or representative may allow another method that gives at least as much protection. This section does not define “alive.”
(b) Frames of all off-track direct-current machines and enclosures of their detached components must be effectively grounded, or kept at no less safe voltages, by approved methods.
(c) Frames of stationary high-voltage equipment powered by ungrounded delta systems must be grounded by approved methods.
(d) Surface and underground high-voltage lines must be deenergized and grounded before work. Repairs to energized surface high-voltage lines may be allowed only when a qualified person makes them under procedures and safeguards prescribed by the Secretary before the operative date, including the operator’s providing, testing, and maintaining protective devices.
(e) When underground power circuits are not in use, they must be deenergized on idle days and idle shifts. Rectifiers and transformers may remain energized.
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.
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.
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.
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.
When not in use, power circuits underground shall be deenergized on idle days and idle shifts, except that rectifiers and transformers may remain energized.
Source credit: (Pub. L. 91–173, title III, § 307, Dec. 30, 1969, 83 Stat. 780.)
- 1969Enacted · Pub. L. 91-173 · 83 Stat. 780
A history note hasn’t been published yet. The record shows enactment by Pub. L. 91-173 on 1969-12-30.
all 0 arguments · sorted by: best
no arguments yet — make the first case