Which fire extinguishing method is considered a last resort for Class C fires?

The use of PKP (Potassium Bicarbonate) is deemed a last resort for Class C fires because it is primarily effective for Class B fires but can also extinguish Class C fires under certain circumstances. Class C fires involve live electrical equipment, and the primary concern when extinguishing such fires is to avoid conducting electricity, which could lead to electrocution or further complications.

While PKP can be used on Class C fires, it is not the preferred method because it does not neutralize the electrical hazard as effectively as other methods. Other extinguishing agents, particularly those that do not pose an electrical hazard (like CO2 and dry chemical agents), should be prioritized. CO2, for instance, is non-conductive and effective for removing the oxygen supply in an electrical fire without damaging equipment.

Thus, PKP is considered a last resort, used when other methods are either not available or impractical, as it is essential to prioritize safety and equipment protection in fires involving electrical components.