In what circumstance should you not attempt to use a fire extinguisher?

The situation where one should not attempt to use a fire extinguisher is when the fire is too large or dangerous. In these instances, the size and intensity of the fire may pose a significant risk to your safety. If the flames are high, rapidly spreading, or producing large volumes of smoke, it is crucial to prioritize personal safety and evacuation rather than engaging with the fire. Attempting to use an extinguisher in such perilous conditions could lead to serious injury or even fatalities, as the fire could overwhelm you before you can effectively suppress it.

Conversely, small fires that are not spreading may be manageable with the proper use of an extinguisher, provided that the person using it has the necessary training and remains within safe distances and conditions. Training in using extinguishers is essential for effective use, but in cases of large or uncontrollable fires, no amount of training can mitigate the inherent dangers present, making it vital to evacuate and call for professional fire assistance instead.