This type of fire extinguisher should not be used to put out fires involving electrical equipment with a voltage greater than 1000 volts or fires with frying oil. This sort of fire extinguisher is necessary in places like garage forecourts, welding and flame cutting shops, and buildings with big boiler rooms that use flammable gases for chemical processes.
Answer (1 of 7): Water extinguishers are one of the most cost-effective ways to fight Class A fires, those fuelled by solid materials such as paper, wood, and textiles. But water extinguishers should not be used on live electrical equipment. Electrical fires need to …
What fire extinguishers should not be used on electrical …
Water fire extinguishers are NOT suitable for electrical fires as water is a conductor and you are at risk of electrocution if used on this type of fire. They are also NOT suitable for flammable liquids or flammable metal fires as it will not extinguish the fire.
Powder extinguishers are effective for class A, B and C fires, since it is not an electrical conductor and since it can effectively break the chain reaction in a liquid or gas fire, something a water extinguisher cannot do.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher