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During an arc flash event, incident energy is primarily related to the amount of current flowing through the electrical circuit and the duration of the fault. As the arc flash progresses, if conditions such as the clearing time of the protection devices are not met promptly, the energy released continues to increase.

This rise in incident energy over time occurs because the fault current remains flowing for a longer duration; as the arc persists, it generates more heat and energy. The magnitude of the incident energy is directly proportional to the length of time the arc remains active, therefore leading to an escalation in the overall energy imparted to a person or object in the vicinity.

Understanding the dynamics of an arc flash is crucial for safety measures and risk management in electrical environments, highlighting the importance of having appropriate protective devices and strategies to minimize exposure to high incident energy levels.