Impressed current cathodic protection systems require inspection at a minimum of:

Impressed current cathodic protection systems, which are used to prevent corrosion on underground storage tanks and piping, require regular inspections to ensure they are functioning effectively. The minimum inspection frequency for these systems is set at every 60 days. This timeframe allows for the monitoring and maintenance of the system's performance, ensuring that the protective measures against corrosion are adequate.

Regular inspections within this 60-day window help identify any potential issues early, such as voltage drop or malfunctioning anodes, and facilitate timely maintenance to maintain the integrity of the underground storage tank system. Inspecting too infrequently could lead to undetected corrosion problems that could compromise the tank's safety and containment abilities.