What is the default flash protection boundary for systems operating at 600 volts?

The default flash protection boundary for systems operating at 600 volts is established to ensure the safety of personnel working near electrical equipment. The correct choice indicates that the boundary measures 48 inches. This distance is determined based on the potential energy release during an electrical fault and the arc flash hazard analysis, which considers factors like system voltage, available fault current, and equipment ratings.

Establishing a flash protection boundary of 48 inches creates a safe working distance that minimizes the risk of injury from arc flash incidents. This standard is commonly referenced in safety regulations and guidance documents, such as the NFPA 70E, which provides guidelines for electrical safety in the workplace.

The other distances mentioned do not align with the established standards for flash protection boundaries at 600 volts, emphasizing the importance of adhering to the correct distance to maintain safety standards in environments where electrical systems are present.