Which extinguishing agents would not be acceptable for use in Class C portable fire extinguishers?

The horns of some older carbon dioxide extinguishers are made of a substance that both negates their class C rating and makes them dangerous for use on class C fires.

What don't you use on a Class C fire to put it out?

Water and water-based foams are not capable of putting out Class C fires because they cannot counteract the constant, electrical ignition source. Because water conducts electrical currents, using water on a Class C fire can result in a spread of the electricity and therefore the fire's source of ignition.

What type of extinguisher is used for Class C fires?

Fire extinguishers with a Class C rating are suitable for fires in “live” electrical equipment. Both monoammonium phosphate and sodium bicarbonate are commonly used to fight this type of fire because of their nonconductive properties.

Can a CO2 extinguisher be used on a Class C fire?

Class C fires, which involve energized electrical equipment, can also be extinguished with CO2. CO2 displaces the oxygen to extinguish the fire.

What is fire Class C?

Class C: Electrical equipment, appliances and wiring in which the use or a nonconductive extinguishing agent prevents injury from electrical shock. Don't use water. Class D: Certain flammable metallic substances such as sodium and potassium.

Fire Training Course - Portable Fire Extinguishers

When should you not use a carbon dioxide fire extinguisher?

Carbon dioxide fire extinguishers, when used in the right circumstances can save lives. However, it would be dangerous to use a carbon dioxide fire extinguisher when dealing with flammable gases, cooking oils and fats, or in a confined space.

Which portable fire extinguisher should be used on a Class C fire on board a vessel under NFPA?

Dry Chemical Fire Extinguishers: The dry chemical fire extinguisher is the most extensively used and the most convenient one as it can be used to put out Class A, Class B and Class C fires.

Which type of portable fire extinguisher is not designed for use on flammable liquid fires?

Water extinguishers are for Class A fires only; they should not be used on Class B or C fires. The discharge stream could spread the flammable liquid in a Class B fire or could create a shock hazard on a Class C fire.

What type of material is contained in a type ABC fire extinguisher?

"ABC" fire extinguishers are filled with a fine yellow powder. The greatest portion of this powder is composed of monoammonium phosphate. Nitrogen is used to pressurize the extinguishers. It is extremely important to identify which types of dry chemical extinguishers are located in your area.

Which is an example of a Class C fire?

A Class C fire is the burning of flammable gases, which can be very dangerous and highly explosive. These include gases such as butane and propane in gas canisters, which you'd expect to find in certain building trades. You will also find these with gas camping stoves and gas barbeques.

What is the most important characteristic of the extinguishing agent in fighting a Class C fire under NFPA?

The extinguishing agent in a Class C fire extinguisher must be electrically nonconductive. Both carbon dioxide and dry chemicals can be used for electrical fires. An advantage of carbon dioxide is that it leaves no residue after the fire is extinguished.

What kind of fire is AB C extinguisher good for?

An extinguisher with an ABC rating is suitable for use with fires involving ordinary combustibles, flammable liquids, and energized electrical equipment. An extinguisher that is rated for use with multiple hazards should include a symbol for each hazard type.

Which type of extinguisher can be used for Class ABCD and electrical fires?

Powder extinguishers are a good multi-purpose fire extinguisher because they can be used on Class A, B and C fires. They can also be used on fires involving electrical equipment however, they do not cool the fire so it can re-ignite.

What is ABC powder fire extinguisher used for?

An ABC or Multi-Purpose Dry Chemical portable fire extinguisher is useful for Class A, B and C fires. These units can be used on wood, paper, cloth, trash, flammable liquids and energized electrical equipment.

Which type of fire extinguisher must not be used in case of electrical based fires?

Electrical fires need to be put out by a substance that is non-conductive unlike the water or foam found in class A fire extinguishers. If someone attempts to put out an electrical fire with something like water, there is a high risk of electrocution since water is conductive.

Which extinguisher should not be used on flammable liquids?

Types of fire extinguishers

Water extinguishers are used on Class A fires involving solid combustibles. They are not suitable for fires fuelled by flammable liquids or where electricity is involved.

What type of extinguisher should not be used 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 is carbon dioxide extinguisher?

Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. You can recognize a CO2 extinguisher by its hard horn and lack of pressure gauge. The pressure in the cylinder is so great that when you use one of these extinguishers, bits of dry ice may shoot out the horn.

Can CO2 be used on flammable liquids?

A CO2 Fire Extinguisher is the extinguisher of choice for electrical fires. It also works on flammable liquid (Class B) fires and is often paired with a foam extinguisher.

Can CO2 be used on paper fire?

Dangers: CO2 extinguishers should not be used on fires involving solid materials, such as paper, wood and fabric, and also are not suitable for use on flammable gases. How it works: The CO2 works by cutting off the fire's oxygen supply. This then smothers it and, as it does so, extinguishes the flames.

Why is oxygen not used in fire extinguishers?

Most fire extinguishers work by separating the fuel from the oxygen. The oxygen comes from the air. It is the same oxygen we breathe. Since the oxygen has to be in contact with the fuel, if you can coat the fuel with something that keeps the oxygen away, the fire will go out.

On which of the following types of surfaces should a Class A fire extinguisher not be used?

Fire buckets can be used filled with water on Class A fires, or with sand to use as an absorbing agent on spilled flammable liquids (Class B). They must not be used with water on burning fat or oil or on electrical appliances.

What are the 4 types of fire extinguishers and their uses?

What is a Class B and C fire?

What types of fires can be extinguished with carbon dioxide (CO2) fire extinguishers? Class B fires which involve flammable liquids and gases, solvents, oils, greases (excluding cooking oils/greases in depth) tars, oil-based paints and lacquers. Class C fires which involve energized electrical equipment.