To prevent electric shock, what should be done before attempting repairs in a fire-affected area?

To effectively prevent electric shock before undertaking repairs in a fire-affected area, it is crucial to ensure that all circuits are de-energized. This step is fundamental because fire can compromise electrical systems, causing potential short circuits or unexpected electrical hazards. When working in an environment that has experienced a fire, there may be damage to wiring and electrical components that could lead to live wires being exposed or malfunctioning equipment remaining energized.

Having all circuits de-energized ensures a safe working environment, allowing repairs to be conducted without the risk of accidental electrocution from energized components. This precaution allows technicians to address the damage effectively and safely without posing a risk to themselves or others in the vicinity. Communicating with the incident commander or wearing protective clothing can be important safety measures in certain contexts, but they do not directly mitigate the immediate risk of electric shock as ensuring circuits are de-energized does.