Based on real-world test data and investigation results from on-the-job safety-related incidents, we have found low-voltage arc flash energy can be underestimated. “Low voltage” in the NESC is defined as 50 volts (V) to 600V (ac). Specifically, one area of concern is 480V equipment, because 480V, three-phase related arc flash incidents can have severe consequences.
Arc flashes are unseen dangers that can occur without any direct contact between a worker’s body and an energized wire or piece of equipment. They’re often accidentally initiated by workers that are unaware that they are in a potentially life-threatening situation.
A stray current is a flow of electric current through unintended conductors such as building structures, electrical grounding or bonding conductors, or other equipment due to electrical supply system imbalances or improper equipment hookup.