What should be checked to ensure safe working conditions on a transformer?

To ensure safe working conditions on a transformer, checking the power supply status is critical. The power supply status indicates whether the transformer is energized or de-energized, which directly impacts safety precautions that need to be taken before any maintenance or work begins. If a transformer is energized, it carries live voltage, posing serious hazards such as electrical shock or arc flash risks to anyone working on or near it.

By confirming that the power supply is off before beginning work, one can take necessary safety measures, including lockout/tagout procedures, to prevent accidental energization. This verification step is essential in any electrical work to protect the personnel involved and maintain a safe working environment around the transformer.

Although weather conditions, voltage levels, and electrical load are important aspects to consider in a broader context of transformer operation and safety, they do not pertain as directly to ensuring immediate safe working conditions.