Which class extinguisher is suitable for fires involving energized electrical equipment?

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Fires that involve energized electrical equipment require an extinguisher that is safe to use around live electricity. An extinguisher rated for electrical fires is designed with a non-conductive extinguishing agent and construction that helps prevent acting as a path for current. This reduces the risk of electric shock or short circuits while you suppress the fire. Water-based extinguishers, or agents not intended for electrical fires, can conduct electricity or create hazardous paths for current, making the situation more dangerous.

So, for a fire with live electrical equipment, the appropriate choice is an extinguisher rated for electrical fires. If the equipment can be safely de-energized, other extinguishing options may be used after that, but during energised conditions, the correct approach is to use an extinguisher designed for electrical fires.