Definition - What does Ignition Source mean?
Fires start as a result of the combination of three agents: fuel, oxygen and an ignition source. Ignition sources include hot surfaces, electricity, static electricity, flames, sparks or smoke. In workplace risk assessments and safety precautions, every attempt should be made to identify and avoid the accidental combination of fuel, oxygen and an ignition source in order to prevent fires.
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Safeopedia explains Ignition Source
Fire risk assessments are an essential component of workplace hazard identification. Ignition sources must be identified and steps must be designed to minimize the chance of fire and the risks incurred by workers should a fire break out. Since oxygen is present in almost all processes, primary precautions are based on the handling and use of flammable materials (the fuel) and the prevention of accidental ignition through an ignition source. The use of static electricity free safety footwear is an example of a precaution aimed at eliminating an ignition source, in this case, static electricity.