Hot Metal Particles
Sparks. The term “spark” can refer to either a non-sustained electrical discharge or a small, airborne, incandescent body. In the latter meaning, “hot metal particles” and “sparks” are synonyms.
Hot metal particles considered in this section are small (a few millimeters or less) particles which are ejected from some process while heated to an incandescent state and can potentially act as ignition sources for a fuel.
Grinding sparks are hot metal particles created by a grinding operation.
Impact sparks are hot metal particles created due to a high-speed collision of two hard objects.
Electric power lines (from conductor clashing, broken insulators, downed conductors, etc.)
Welding or torch-cutting metals
Impact of power tools
Ignition of vegetation may be smoldering or flaming, but...
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