What should be done to extinguish de-energized Charlie fires?

To extinguish de-energized Charlie fires effectively, it is necessary to treat them as A, B, or D fires, as the nature of these fires falls into these classifications depending on the materials involved and their state.

Class A fires involve ordinary combustibles such as wood, paper, and cloth. Class B fires pertain to flammable liquids, while Class D fires relate to combustible metals. De-energized Charlie fires are often related to electrical components that can be still categorized under these classes once they are removed from an energized state. This approach allows for a broader strategy for suppression, utilizing various extinguishing agents appropriate for each fire type rather than limiting oneself to a specific agent.

Considering the other options, using CO2 extinguishers might not be the most effective or versatile method, as not all types of fires fit neatly into the criteria addressed by CO2 alone. Applying Halon exclusively would also limit your strategy, as not all classes would be effectively managed by this agent. Lastly, sticking to water only in small amounts could be unsafe, depending on the fire's classification and the materials involved. Therefore, treating de-energized Charlie fires as A, B, or D fires presents a comprehensive solution to effectively combat them.