Code of Federal Regulations (Last Updated: April 5, 2024) |
Title 30 - Mineral Resources |
Chapter I - Mine Safety and Health Administration, Department of Labor |
SubChapter O - Coal Mine Safety and Health |
Part 75 - Mandatory Safety Standards - Underground Coal Mines |
Subpart H - Grounding |
§ 75.700-1 - Approved methods of grounding.
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§ 75.700-1 Approved methods of grounding.
Metallic sheaths, armors and conduits in resistance grounded systems where the enclosed conductors are a part of the system will be approved if a solid connection is made to the neutral conductor; in all other systems, the following methods of grounding will be approved:
(a) A solid connection to a borehole casing having low resistance to earth;
(b) A solid connection to metal waterlines having low resistance to earth;
(c) A solid connection to a grounding conductor, other than the neutral conductor of a resistance grounded system, extending to a low resistance ground field located on the surface;
(d) Any other method of grounding, approved by an authorized representative of the Secretary, which ensures that there is no difference in potential between such metallic enclosures and the earth.