MSHA - Code of Federal Regulations - 30 CFR 75.822
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MSHA -  Title 30 CFR

30 CFR § 75.822
Underground high-voltage longwall cables.

      In addition to the high-voltage cable design specifications in § 75.804 of this part, high-voltage cables for use on longwalls may be a type SHD cable with a center ground-check conductor no smaller than a No. 16 AWG stranded conductor. The cables must be MSHA accepted as flame-resistant under part 18 or approved under subpart K of part 7.