Arc Flash PPE Category Chart — NFPA 70E Category Overview

How Categories Relate to Incident Energy

When a detailed incident-energy analysis is not used, NFPA 70E provides a PPE category method tied to task tables and equipment parameters. Categories roughly align with minimum arc ratings (cal/cm²). Many employers prefer calculated incident energy and matching ATPV/EBT clothing instead of categories — both approaches require a documented risk assessment.

For boundary distance and how calculator estimates fit, see the arc flash boundary guide and arc flash boundary calculator. Shop PPE context: PPE selection guide by process.

PPE Category Overview (Typical)

“Typical” clothing lists are abbreviated. Layering, underlayers, and whether balaclava vs hood is required depend on the task table and employer program.

Incident Energy vs Category — Quick Compare

If a label states incident energy (e.g., 12 cal/cm²), select clothing rated at least that value — do not “round down” to a lower category for comfort.

Shock PPE Is Separate

Arc-rated clothing addresses thermal energy. Shock protection (voltage-rated gloves, sleeves, insulated tools) is driven by system voltage and approach boundaries. Both can be required on the same job. Opening a 480V panel in Cat 2 AR clothing without Class 00/0 gloves when required is still a shock violation.

How to Use This Chart

1. Read the equipment arc flash label (IE or PPE category).
2. Select AR clothing meeting or exceeding the stated requirement.
3. Add shock PPE per voltage and approach limits.
4. If unlabeled, stop — do not guess category from this overview alone; obtain assessment.

Working Distance Matters

Incident energy is quoted at a working distance (often 18 inches for low-voltage panels, sometimes different for other equipment). Standing closer raises energy; standing farther lowers it. Category tables embed assumed working distances and tasks — do not invent a lower category because you “plan to stand back” unless the written procedure and study say so.

Common Mistakes

• Cotton underlayers that melt — synthetic non-AR layers under AR clothing can worsen burn injury.
• Untested face protection — sunglasses are not an arc-rated faceshield.
• Ignoring shock PPE — AR clothing does not insulate against contact voltage.
• Using an old label — system changes (transformer upsizing, fuse changes) can obsolete a study.

For shop welding/grinding PPE that is not arc-flash specific, cross-link the process PPE guide. Electrical tasks near hot work still need fire-watch discipline via the hot-work checklist when sparks and open flames are present.

When Categories Do Not Apply

Above the highest category energy, or outside table parameters (high fault current, long clearing times), the category method may not be usable — you need incident-energy analysis. Extremely high IE may mean the only acceptable control is to not work energized. Calculators on this site are for orientation and “what-if” clearing-time discussions, not stamped engineering studies.

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