An arc flash is a sudden release of electrical energy caused when current jumps through air between conductive parts. The result can be extreme heat, bright light, pressure, molten metal, and serious burns or equipment damage. It is a major hazard in energized panels, switchgear, inverters, batteries, and other power systems, including photovoltaic installations.
In cyber security, arc flash matters because the safety of industrial and energy systems depends on both physical controls and trusted control logic. A faulty configuration, bad maintenance practice, or malicious change to an OT system can leave equipment energized when workers expect it to be safe. Defenders reduce the risk with lockout/tagout, verification of zero voltage, remote isolation, interlocks, arc-rated PPE, and strict work procedures. Arc flash is not a “spark”; it is a high-consequence electrical event that can turn routine service into an emergency in seconds.