An impressed current cathodic protection (ICCP) system for protecting a structure 1 against corrosion, the system comprising a power supply 8 connected to conversion means 3 for converting the output of the power supply to DC at a required level. The conversion means is connected to the power supply by an electrical connection where, in use, the structure forms a cathode. An anode 13 is electrically connected to the conversion means, where an electrical connection cable between the conversion means and the anode is of a relatively high current-carrying capacity compared to the electrical connection between the AC power supply and the conversion means. An electrical connection cable between the conversion means and the structure is provided, were the cable is of a relatively high current-carrying capacity compared to the electrical connection between the power supply and the conversion means. The power supply may be an AC power supply so that a transformer 11 and a rectifier 12 can also be provided as part of the conversions means. The rectifier 12 may be a full wave rectifier and the transformer 11 can be a step down transformer.
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