They CANNOT be used on electrical or flammable metal fires since the extinguisher may worsen the situation. Foam extinguishers are appropriate for a variety of fire-prone environments, such as offices, factories, warehouses, and hotels. A black label saying CO2 fire extinguisher can be spotted “CO2 is a greenhouse gas.
Which two types of fire extinguishers should you never use on an electrical fire? 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.
What Fire Extinguisher Do You Not Use On Electrical Fires?
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.
CO2 fire extinguishers are safe for use on flammable liquid and electrical fires. They are NOT for use on wood, paper or fabric fires. They are also NOT suitable for cooking fires that involve oil and grease (such as chip pan fires) as the extinguisher could end up blasting the flames into surrounding areas.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher