These tables Hazard Risk Category, PPE requirements, and Flash Protection Boundaries based on arc flash incident energy levels. Reference the 2015 NFPA 70E¢ç: Standard for Electrical Safety in the Workplace¢ç for a more complete reference for Arc Flash Hazard calculations and safety.

Hazard Risk Categories

Source: NFPA 70E, National Electrical Code

Hazard Risk Category	Typical Protective Equipment	Incident Energy (Cal/cm^2)
0	Nonmelting, non-flammable material	1.2
1	Fire resistant (FR) pant and shirt, or FR coverall	4
2	Cotton underwear plus FR shirt and FR pants	8
3	Cotton underwear plus FR shirt, FR pants with FR coveralls	25
4	Cotton underwear plus FR shirt, FR pants, and multi-layered flash suit	40

General Flash Protection Boundaries

Source: NFPA 70E, National Electrical Code

Arc Location	System Voltage	Flash Protection Boundary (feet)
Arc in Air	200 - 1,000 Volts	4
Arc in Enclosure	200 - 1,000 Volts	10
Arc in Enclosure	Over 1,000 Volts	20

To calculate arc flash incident energy levels and Flash Protection Boundaries for your system, visit Arc Flash Calculator.

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