This International Standard specifies performance requirements for cathodic protection of steel in cementbased concrete, in both new and existing structures. It covers building and civil engineering structures, including normal reinforcement and prestressed reinforcement embedded in the concrete. It is applicable to uncoated steel reinforcement and to organic-coated steel reinforcement.This International Standard applies to steel embedded in atmospherically exposed, buried, immersed and tidal elements of buildings or structures.NOTE 1 Annex A gives guidance on the principles of cathodic protection and its application to steel in concrete.NOTE 2 This Interna