What is the preferred method for extinguishing an elevated transformer fire?

Utilizing a dry chemical extinguisher from an aerial device is the preferred method for extinguishing an elevated transformer fire primarily due to safety considerations and the nature of transformer fires. Transformers can contain flammable oils and pressurized components, creating a risk of explosions if not handled properly.

Dry chemical extinguishers can effectively interrupt the combustion process of both solid and liquid fuels associated with transformer fires, while also minimizing the risk of electrical shock due to their insulating properties. The use of an aerial device allows firefighters to maintain a safe distance from the fire, safeguarding them from potential hazards such as electrical arcs or explosions that can occur when water is applied.

In contrast, using water to extinguish the fire can be extremely dangerous, especially with electrical equipment, as it may create an electrical hazard and worsen the situation. Allowing the transformer to burn until help arrives does not mitigate the risk to nearby structures or the environment, and using foam extinguishing agents may not be practical for elevated fires that require a controlled and stable application method. Thus, employing a dry chemical extinguisher from an aerial platform balances effective fire control with safety and tactical efficiency.