Why is water and foam unsuitable for extinguishing electrical fires? Because water, like pretty much all liquids, conducts electricity.
Water is a good and commonly used fire extinguisher. But Water by nature is a very good conductor of electricity. When any electrical appliance catch fire it's …
Why is water and foam unsuitable for extinguishing electrical fires …
Because water, like pretty much all liquids, conducts electricity. If added to an electrical fire, the water/foam would just spread the electricity further and …
It is dangerous to use water on electrical fires because of the dangers of electric shocks. It is also dangerous to use water on oil fires because the water will vaporize due to the heat and form a bubble of water vapour combined with the fuel which is mixed with oxygen and therefore water is not normally recommended for fighting oil fires.
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Water vs Foam Fire Extinguishers – the key differences explained. Video Answer

Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher