MSHA - Code of Federal Regulations - 30 CFR 18.52
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MSHA - Title 30 CFR

30 CFR § 75.813
High-voltage longwalls; scope.

Sections 75.814 through 75.822 of this part are electrical safety standards that apply to high-voltage longwall circuits and equipment. All other existing standards in 30 CFR must also apply to these longwall circuits and equipment where appropriate.