Electrical safety

Arc-flash PPE category + boundary

The NFPA 70E table-method PPE category and arc-flash boundary before you open a live panel.

The equipment

Equipment

Available fault current (kA)

Fault clearing time (seconds)

At 60 Hz: 2 cycles = 0.033 s, 30 cycles = 0.5 s.

PPE category

PPE categoryCategory 14 cal/cm²

Minimum arc rating

4 cal/cm²

Arc-flash boundary

19 in (485 mm)

Working distance

18 in

This is the NFPA 70E-2024 arc-flash PPE category (table) method, an awareness aid ONLY. NFPA 70E 130.5 requires a documented arc-flash risk assessment by a qualified person, and the table may be used only within its exact parameter limits, never as a substitute for the equipment's own arc-flash label. Where the parameters are exceeded, an incident-energy analysis is required. Do not work energized without a proper assessment.