Occupational Safety and Health (OHS) is a crucial aspect in energy infrastructure maintenance operations, such as Distribution Substations (GD) owned by PLN. Cubicle maintenance work at GD PLN is a critical activity that involves high risks to worker safety and health and has an impact on the continuity of electricity supply. This study aims to analyze the application of K3 to 20 kV cubicle maintenance work at GD PLN. Through a qualitative approach, data are obtained based on observation, interviews and literature studies. The results showed that the application of K3 was obtained through safety briefing activities and K3 documentation which included SOPs, inspectors, HIRARC and JSA. While the maintenance process of the 20 kV cubicle includes preparation, implementation and completion.
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