US lawFederal (United States)RegulationsTitle 49 CFR — TransportationChapter IPart 192Subpart H192.37749 C.F.R. § 192.377Service lines: Copper.Last amended: 2016Year: 2026Length: 14 wordsOfficial source Cite as 49 C.F.R. § 192.377 (2026)Each copper service line installed within a building must be protected against external damage.Previous49 C.F.R. § 192.376