Cathodic corrosion protection with current limiter

A method for cathodically protecting and/or passivating a steel member in an ionically conductive concrete or mortar material, comprising:

• providing an anode construction for communication of an ionic current to the steel member in the ionically conductive material;
• generating a voltage difference between the anode construction and the steel member so as to cause a current to flow through the ionically conductive material between the anode construction and the steel member so as to provide cathodic protection of the steel member;
• providing at least one electrically conductive circuit between the anode construction and the steel member;
• and connecting a device in said circuit wherein the device is arranged to pass current in a first direction and which has an insulative mode in a second direction of a type which allows a leakage current when operating in the insulative mode;
• and applying said voltage difference across the device in the insulative mode such that the leakage current passes through the device in the insulative mode and thus limits the current to a maximum value defined by the leakage current.