What is arc flash
WHAT IS ARC FLASH
An arc flash is the light and heat produced from an electric arc supplied with sufficient electrical energy to cause substantial damage, harm, fire, or injury. Electrical arcs experience incremental negative resistance, which causes the electrical resistance to decrease as the arc temperature increases. Therefore, as the arc develops and gets hotter, the resistance drops, drawing more and more current (runaway current) until some part of the system melts, trips, or evaporates, providing enough distance to break the circuit, which extinguishes the arc.
In addition to heat, light and concussive forces, an arc flash also produces a cloud of plasma and ionized particles. When inhaled, this ionized gas can cause severe burns to the airway and lungs. The charged plasma may also be attracted to metallic objects worn by persons in the vicinity.
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