What type of cathodic protection system should components not be electrically isolated?

The choice of an impressed current system is appropriate for the question regarding which type of cathodic protection system should not have components electrically isolated. In impressed current systems, an external power source is utilized to provide a continuous supply of current to protect the metal surfaces from corrosion. This type of system effectively distributes protective current to the components requiring protection, necessitating a direct electrical connection.

In this context, electrical isolation of components would inhibit the flow of current necessary for effective protection against corrosion. Unlike other systems that may function effectively with isolated components, such as galvanic anode systems that rely on the natural potential differences and electrochemical reactions between dissimilar metals, impressed current systems depend on a consistent electrical connection to function properly.

The passive nature of galvanic anode systems operates under the principle of sacrificial anodes, which may allow for some isolation due to their natural corrosion potentials without the requirement for continuous external power. Hybrid systems incorporate elements of both impressed current and galvanic systems and may also allow for some electrical isolation in certain configurations. However, in the case of impressed current systems, maintaining an electrically connected system is vital for optimal performance and protection.