The maintenance of electric cables is crucial for ensuring the reliability and safety of power distribution systems. This includes regular inspection of cables to detect signs of aging, deterioration, or mechanical damage. Diagnostic tests, such as partial discharge testing and tangent delta testing, are used to assess the condition of the insulation and identify potential faults before they cause failures. Both online and offline monitoring of cables allows for early detection of issues, enabling proactive interventions. By keeping cables in good condition, companies can reduce downtime, extend the lifespan of installations, and improve the overall efficiency of the electrical network.