Default flash boundary for NFPA 70E is specified as:

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Multiple Choice

Default flash boundary for NFPA 70E is specified as:

Explanation:
Arc flash boundary is the distance within which a person could be exposed to the energy of an arc fault. For voltages up to 600 V, NFPA 70E sets a default boundary of four feet (48 inches). This conservative distance is used when exact fault current data isn’t applied, providing protection for workers who might encounter energized parts. The other options don’t match this standard default distance for up to 600 V—2 feet, 3 feet, or 5 feet aren’t the established default. So, the correct choice is 600V with a 48-inch boundary.

Arc flash boundary is the distance within which a person could be exposed to the energy of an arc fault. For voltages up to 600 V, NFPA 70E sets a default boundary of four feet (48 inches). This conservative distance is used when exact fault current data isn’t applied, providing protection for workers who might encounter energized parts. The other options don’t match this standard default distance for up to 600 V—2 feet, 3 feet, or 5 feet aren’t the established default. So, the correct choice is 600V with a 48-inch boundary.

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