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The flash protection boundary (FPB) is a safety zone established around electrical equipment to protect individuals from the risks of arc flash incidents. It indicates the distance from the equipment within which a person could potentially receive a harmful level of thermal energy during an arc flash event. This boundary is calculated based on the available fault current, the duration of the arc, and the equipment's protective devices. Establishing the FPB is crucial for ensuring safe working conditions in environments where electrical hazards are present.

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