Code of Federal Regulations (Last Updated: July 5, 2024) |
Title 30 - Mineral Resources |
Chapter I - Mine Safety and Health Administration, Department of Labor |
SubChapter O - Coal Mine Safety and Health |
Part 77 - Mandatory Safety Standards, Surface Coal Mines and Surface Work Areas of Underground Coal Mines |
Subpart I - Surface High-Voltage Distribution |
§ 77.804 - High-voltage trailing cables; minimum design requirements.
Latest version.
-
§ 77.804 High-voltage trailing cables; minimum design requirements.
(a) High-voltage trailing cables used in resistance grounded systems shall be equipped with metallic shields around each power conductor with one or more ground conductors having a total cross-sectional area of not less than one-half the power conductor, and with an insulated conductor for the ground continuity check circuit. External ground check conductors may be used if they are not smaller than No. 8 (AWG) and have an insulation rated at least 600 volts.
(b) All such high-voltage trailing cables shall be adequate for the intended current and voltage. Splices made in such cables shall provide continuity of all components.