Definition(s)
Central Conductor
Conductor that is passed through the bore of OCTG in order to create a circular or circumferential magnetic field in the OCTG. NOTE This does not imply that the current rod is necessarily centred in the bore of the OCTG.
Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards