Can transformers be energized while work is being performed inside them?

Transformers must be de-energized when work is being performed inside them due to safety concerns and the significant risks associated with working on energized equipment. When a transformer is energized, it carries high voltage and can present a serious hazard to individuals performing maintenance or repairs.

De-energizing the transformer ensures that workers are not exposed to the risk of electric shock or injury that could occur if quick access to high voltage or accidental contact happens. It also allows for safe installation, testing, and maintenance of components within the transformer without the risk of an electrical fault leading to hazards.

Overall, safety regulations and best practices dictate that electrical work should only be performed on equipment that has been properly shut down, locked out, and tagged out, ensuring a safe environment for personnel involved in the work.