An arc is an electrical phenomenon that occurs when flowing current leaves its intended conductor, traveling through air to another conductor or to ground. The resulting release of electrical energy produces a flashover, or flash that is capable of causing fire, damage to property, and severe burns and death to individuals within close proximity.
Arc flashes can produce blast pressure high enough (upwards of 2,000 lbs. per square foot) to knock down humans and propel objects through air. Arc temperatures can reach 35,000° F, hot enough to melt metal and send the droplets flying. Resulting sound blast decibel level can rival that of a gunshot.1