CFR›Title 30›Chapter I›Part 57›Subpart K ContainsSubject groups Surface and Underground–Underground OnlyCorpusDaily eCFRDisplayed edition2026-06-25Last updated2026-06-25 Subpart K—Electricity Subject Groups Surface and Underground Surface and Underground Sections 57.12001–57.12053 Surface Only Surface Only Sections 57.12065–57.12071 Underground Only Underground Only Sections 57.12080–57.12088 Previous J Subpart J—Travelways and Escapeways Next L Subpart L—Compressed Air and Boilers