When should you not use a portable fire extinguisher?

There are certain situations where using a portable fire extinguisher may not be appropriate or effective. Firstly, if the fire is already too large or spreading rapidly, attempting to extinguish it with a portable fire extinguisher can be dangerous and ineffective. I

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Lone Star Fire First Aid's answer to When should you not use a portable fire extinguisher? - Quora

Lone Star Fire First Aid's answer: There are certain situations where using a portable fire extinguisher may not be appropriate or effective. Firstly, if the fire is already too large or spreading rapidly, attempting to extinguish it with a port