US lawFederal (United States)RegulationsTitle 49 CFR — TransportationChapter IIPart 236Subpart G236.72349 C.F.R. § 236.723Circuit, double wire; line.Last amended: 2017Year: 2026Length: 16 wordsOfficial source Cite as 49 C.F.R. § 236.723 (2026)An electric circuit not employing a common return wire; a circuit formed by individual wires throughout.Previous49 C.F.R. § 236.707Next49 C.F.R. § 236.754