ABSTRACT
When cathodically protecting steel-reinforced concrete structures the need for power is normally modest compared to that required for cathodically protecting steel structures in water or soil. For concrete it is normal to use several small power supplies, each with an output of around 0.5 to 5 amps and a maximum output voltage in the region of 10 to 20 volts (depending on the anode type). This can be compared to steel cathodic protection (CP) systems where 200 amps transformer rectifiers are common and the protection of processing plants where single power supplies can have a capacity of 1000 amps or more.
