California ICC UST Service Technician Practice Exam

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Can impression current rectifiers be de-powered on active cathodic protection systems?

  1. Yes, they can be de-powered

  2. No, they may never be de-powered

  3. Only during maintenance

  4. Only if instructed by a technician

The correct answer is: No, they may never be de-powered

In the context of active cathodic protection systems, impression current rectifiers play a critical role in maintaining the integrity of pipelines and other structures that may be subject to corrosive environments. These systems work by applying a direct current to the cathodic protection system, effectively preventing corrosion. De-powering impression current rectifiers while the system is active can interrupt this protective current and lead to potential corrosion damage on the structures being protected. The application of cathodic protection is continuous and must be sustained to ensure that the protective measures remain effective. Disabling the rectifier, even momentarily, could create areas of vulnerability where corrosion can begin to occur unchecked. Therefore, it is essential that these systems remain powered, highlighting that they may never be de-powered during normal operations. This understanding underscores the importance of consistent and uninterrupted cathodic protection to preserve structural integrity and prevent costly repairs.