Cathodic Protection Tester Practice Exam

What is an advantage of a galvanic anode system in soil compared to an impressed current system?

1. It requires frequent maintenance

2. It uses more expensive materials

3. No external power source is needed

4. It provides higher current levels

The correct answer is: No external power source is needed

A galvanic anode system has the distinct advantage of not requiring an external power source, which is a significant benefit in many applications. This feature stands in contrast to impressed current systems, which rely on an external power supply to drive the protective current. Because galvanic anodes rely on the natural electrochemical potential generated by the metal anode itself, they can function effectively in environments where power availability is an issue or where maintenance of power sources could be difficult. This independence from external power simplifies the installation and operational requirements of galvanic anode systems, making them particularly suitable for remote locations or for instances where ongoing electricity supply might be problematic. The passive nature of galvanic anodes often leads to lower operational costs and reduced complexity in system design and management. Higher current levels, maintenance needs, and material costs are factors that typically favor other systems or may pose disadvantages rather than align with the advantages of galvanic anodes.