An Arc flash is a flash over of electric current through air from an exposed live conductor to another or to _____.

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An arc flash occurs when the insulating air between a live conductor and another path breaks down and current arches through the air. The destination is typically a surface at a different potential that can complete the fault current path back to the source. Ground is the most common and practical destination because it provides the reference potential and a return path for fault current, which is why this choice fits the definition best. Insulation cannot be the arc path since its job is to prevent current flow. Neutral is a conductor, but the standard arc-flash hazard description emphasizes a path to ground, and water is not the typical controlled fault path in electrical safety.