For a burning pile of empty cardboard boxes, one should use foam fire extinguishers.
The fires that are caused by organic materials like wood, textile, fabric, paper, coal or cardboard, etc, are to be extinguished by foam extinguishers. These are also used for fires caused by flammable liquids like paint or petrol.
These are some of the most common types of fire extinguishers. This kind of extinguishers cannot be used for fires started by electrical appliances unless they have passed a 35 kv conductivity test.
Fire extinguishers are not used for cooking fires or for fires related to flammable gases.
Therefore, a fire on a burning pile of empty cardboard boxes will be extinguished by foam extinguishers.
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