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Code · CFR · Title 30 — Mineral Resources · Part 75 · § 75.802

§ 75.802. Protection of high-voltage circuits extending underground.

322 words·~1 min read·/us/cfr/t30/s§ 75.802·

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(a)Except as provided in paragraph
(b)of this section, high-voltage circuits extending underground and supplying portable, mobile, or, stationary high-voltage equipment shall contain either a direct or derived neutral which shall be grounded through a suitable resistor at the source transformers, and a grounding circuit, originating at the grounded side of the grounding resistor, shall extend along with the power conductors and serve as a grounding conductor for the frames of all high-voltage equipment supplied power from that circuit.
(b)Notwithstanding the requirements of paragraph
(a)of this section, the Secretary or his authorized representative may permit ungrounded high-voltage circuits to be extended underground to feed stationary electric equipment if:
(1)Such circuits are either steel armored or installed in grounded, rigid steel conduit throughout their entire length; or,
(2)The voltage of such circuits is nominally 2,400 volts or less phase-to-phase and the cables used in such circuits are equipped with metallic shields around each power conductor, and contain one or more ground conductors having a total cross sectional area of not less than one-half the power conductor; and,
(3)Upon a finding by the Secretary or his authorized representative that the use of the circuits described in paragraphs
(1)and
(2)of this section does not pose a hazard to the miners.
(c)Within 100 feet of the point on the surface where high-voltage circuits enter the underground portion of the mine, disconnecting devices shall be installed and so equipped or designed in such a manner that it can be determined by visual observation that the power is disconnected, except that the Secretary or his authorized representative may permit such devices to be installed at a greater distance from such area of the mine if he determines, based on existing physical conditions, that such installation will be more accessible at a greater distance and will not pose any hazard to the miners. \[38 FR 4975, Feb. 23, 1973\]
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§ 75.802
Protection of high-voltage circuits extending underground.
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