How many operations should electronic reclosers undergo before they need inspection?

Electronic reclosers are used in electrical distribution systems to enhance reliability and reduce outages by automatically interrupting and then restoring service after a fault has been detected. The need for inspection after a certain number of operations is based on the wear and tear that components experience during their functioning.

The correct answer indicates that after 150 operations, electronic reclosers should be inspected. This threshold is important because it allows for proactive maintenance to ensure that the equipment continues to operate efficiently and reduces the risk of failure when it is needed most. Inspections help identify any potential mechanical or electrical issues that may arise from repeated cycling, which could compromise the reliability of the recloser.

The other options suggest different operation thresholds, but 150 operations is established as the best practice based on industry standards and the average lifespan of the components involved. This standard helps maintain optimal performance and safety in electrical distribution networks.