Informational Note No. 1 defines an arc flash hazard as a source of possible what?

The correct answer pertains to the definition of an arc flash hazard as a source of possible injury or harm. Informational Note No. 1 in the NFPA 70E standard highlights that arc flash can result in severe injuries, including burns and other trauma to individuals who are exposed to the high temperatures and pressures generated during an arc flash event. Understanding this aspect is crucial for workers' safety, as it underscores the potential consequences of exposure to such hazards.

Focusing on injury or harm is essential because it serves as a primary concern for safety protocols. Recognizing the risk of injury enables organizations to implement effective safety measures, training, and PPE (personal protective equipment) to prevent accidents in the workplace.

The other choices, while relevant risks in an electrical environment, are not directly indicated as the primary concern associated with the definition of an arc flash hazard in this context. Thus, while equipment damage, electrical shock, and energy loss are important considerations in electrical safety, the central theme of the informational note emphasizes the potential for human injury or harm.