What is defined as current flowing on a structure that is not part of the intended electrical circuit?

Stray current refers to the unwanted flow of electric current that occurs on the surfaces of structures, such as pipelines or rebar, rather than through the designated electrical circuit. This phenomenon can arise from various sources, including electrical imbalances in systems, grounding issues, or external interference from nearby electrical installations. The presence of stray current can lead to accelerated corrosion of metal structures, posing significant risks and necessitating monitoring and mitigation strategies in corrosion control practices.

By identifying stray current, professionals can implement appropriate cathodic protection systems to counteract its effects and ensure the integrity of structures that are susceptible to corrosion. Consequently, recognizing and understanding stray current is crucial in the field of corrosion engineering and protection.