Arc
Electric arc refers to the discharge caused by voltage breakdown of air, generating instantaneous high-temperature sparks, releasing huge energy, and causing serious accidents such as personnel injury or equipment damage.
Electric arc is different from electric shock. Electric shock is when the human body comes into direct contact with a power source, causing damage to the heart, lungs, nervous system, and can also cause skin burns.
Poor manufacturing and installation of switches, damage to wire insulation, equipment malfunctions, and unauthorized operations can all lead to arc accidents.

