Arc flash facts for kids
Arc flash is an accidental electrical explosion usually caused by a short circuit. It usually happens at higher-voltages (around 300 volts and above). It can cause the electrical conductors to melt creating an explosion of molten or even vaporized metal. Temperatures can be as high as 20000 degrees Celsius. Arc flash is one of the reasons it is so important to turn the power off before working on any high-voltage equipment.
Images for kids
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An electric arc between two nails
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A controlled arc-flash, produced in a flashtube. Even though the energy level used is fairly low (85 joules), the low-impedance, low-inductance circuit produces a flash of 24,000,000 watts. With an arc temperature of 17,000 K (30,100 °F), the radiation output is centered at 170 nanometers, in the far UV. The intense burst of radiation easily penetrates the shade #10 welding filter which shields the camera.
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A 480 volt switchgear and distribution panel, requiring category-4 arc-flash protection.
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Example of IED equipped with arc protection
