What approach should be taken when extinguishing fires involving live electrical wires?

When extinguishing fires involving live electrical wires, the safest approach is to de-energize the source if possible before attempting to extinguish the fire. This method is essential because water is a conductor of electricity and can create a serious risk of electrocution for the firefighter if it is sprayed directly at live wires. Even non-conductive extinguishing agents may not be suitable in the absence of de-energizing the electrical source, as residual electricity could still pose a danger.

De-energizing the electrical source will eliminate the risk of electric shock and ensure that the fire can be extinguished safely. Once the power is turned off, standard firefighting techniques and equipment can be more safely employed to control and extinguish the fire.

Using foam suppressants or various types of fire extinguishers, such as those containing CO2, may be appropriate in some circumstances, but the critical first step is always to address the risk of electrical shock by de-energizing the source where feasible. This prioritization of safety is crucial in firefighting operations involving electrical hazards.