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Field Testing & Twin SaaS
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#14Arc Flash, Shock Boundary & PPE Safety Audit

Project Framework (report reference): IEC 60364-4-41Applicable Standard: NFPA 70E / IEEE 1584-2018
Module Field Guides, Standard Selection & Tutorials (3)Browse All 93+ Guides →
1 · Field Measurement ProcedureHow to Measure & Test Arc Flash & PPE Audit on Site: Step-by-Step Field Procedure (NFPA 70E / IEEE 1584-2018)2 · Standards & Limit TablesWhich Standard Applies to Arc Flash & PPE Audit? Acceptance Limits, Annex Tables & Regional Equivalents (NFPA 70E / IEEE 1584-2018)3 · OhmCert Tutorial & Case StudyHow to Complete a Arc Flash & PPE Audit Certificate in OhmCert: Worked Case Study & Troubleshooting

Multi-Asset / Multi-Point Equipment Schedule

Inspect multiple transformers, panels, rooms, motors, or RCDs in this module without overwriting previous assets. Each item receives a permanent QR Sticker UID preserved across annual audits.

Sticker UID: OC-ARC0-8F70
Plant & SLD (Auto-SLD)

Standard Limits, Equations & Space Presets

Full IEEE 1584-2018 & NFPA 70E parametric evaluation: calculates arcing current I_arc, incident energy E (cal/cm2), Arc Flash Boundary D_AFB, NFPA 70E Table 130.4(E)(a) AC shock boundaries, and IEC 60903 glove class.

One-Click Normative Presets (Auto-fills Target Limits)
Governing Equations & Physical Constants
E_incident

E = 4.184 x Cf x En x (t / 0.2) x (610 / D)^x [J/cm2 -> cal/cm2]

Incident thermal energy at working distance D (mm) for clearing duration t (s) per IEEE 1584.

D_AFB

D_AFB = D x sqrt(E / 1.2)

Arc Flash Boundary distance where incident energy equals 1.2 cal/cm2 (5.0 J/cm2 second-degree burn threshold).

NFPA 70E Table 130.7(C)(15)(c): Arc-Rated PPE Categories & Incident Energy Thresholds

NFPA 70E-2024 / IEEE 1584-2018
PPE CategoryIncident Energy Range (cal/cm2)Min Arc Rating of ClothingRequired Head / Face / Hand Protection
Category 0 (Below AFB)<= 1.2 cal/cm2Non-melting natural fiberSafety glasses, hearing protection, leather/insulated gloves
Category 11.2 - 4.0 cal/cm2>= 4 cal/cm2Arc-rated face shield (or hood), hard hat, voltage-rated gloves + leather protectors
Category 24.1 - 8.0 cal/cm2>= 8 cal/cm2Arc-rated flash suit hood OR face shield + arc-rated balaclava, hard hat, gloves
Category 38.1 - 25.0 cal/cm2>= 25 cal/cm2Full arc-rated flash suit jacket, pants, bee-keeper hood (>=25 cal/cm2), gloves
Category 425.1 - 40.0 cal/cm2>= 40 cal/cm2Full multi-layer arc flash suit & hood (>=40 cal/cm2), voltage-rated gloves
EXTREME DANGER> 40.0 cal/cm2NO PPE SUFFICIENTPROHIBITED: De-energize equipment! Blast pressure can cause fatal injury.

NFPA 70E Table 130.4(E)(a) AC Shock Protection Boundaries & IEC 60903 Glove Classes

NFPA 70E Table 130.4(E)(a) & IEC 60903
Nominal System Voltage (L-L)Limited Approach (Fixed Part)Restricted Approach BoundaryMin IEC 60903 Insulating Glove Class
50 V - 300 V AC1.0 m (3 ft 6 in)Avoid contactClass 00 (500 V AC max use)
301 V - 750 V AC (400V / 480V / 690V)1.0 m (3 ft 6 in)0.3 m (1 ft 0 in)Class 00 (<=500V) or Class 0 (<=1000V)
751 V - 15 kV AC (6.6 kV / 11 kV)1.5 m (5 ft 0 in)0.7 m (2 ft 2 in)Class 1 (<=7.5kV) or Class 2 (<=17kV)
15.1 kV - 36 kV AC (20 kV / 34.5 kV)1.8 m (6 ft 0 in)0.8 m (2 ft 9 in)Class 3 (<=26.5kV) or Class 4 (<=36kV)

Measured Inputs

IEEE 1584 Incident Energy, NFPA 70E Shock Boundaries & PPE Matching

Parametric IEEE 1584 / NFPA 70E Annex D engine: enter System Voltage V_sys, Equipment Class, Bolted Fault Current I_bf (kA), and Clearing Time t_arc (s) to compute estimated arcing current I_arc, Incident Energy E (cal/cm2), Arc Flash Boundary D_AFB, NFPA 70E Table 130.4(E)(a) AC shock boundaries, and IEC 60903 dielectric glove compliance (or enter a manual ETAP/SKM incident energy override).

Pending / Not tested — results stay neutral until valid measured values are entered.

  • Estimated Arcing Current I_arc & Incident Energy E

    -

    Calculated via IEEE 1584 empirical equations from V_sys, I_bf, electrode gap, and clearing time t_arc.

    Pending

  • Arc Flash Boundary D_AFB (1.2 cal/cm2 Second-Degree Burn Onset)

    -

    Minimum approach distance without arc-rated PPE where incident energy drops to 1.2 cal/cm2 (5.0 J/cm2).

    Pending

  • NFPA 70E AC Shock Boundaries (at V_sys = 400 V)

    -

    NFPA 70E Table 130.4(E)(a) fixed-circuit-part shock protection boundaries.

    Pending

  • Arc-Rated PPE Category Matching

    -

    Not tested - enter the measured value. Acceptance: Arc rating thresholds: Cat 1 = 4, Cat 2 = 8, Cat 3 = 25, Cat 4 = 40 cal/cm2; > 40 cal/cm2 prohibits energised work [NFPA 70E Table 130.7(C)(15)(c) / IEEE 1584-2018]

    Pending

  • Dielectric Insulating Glove Voltage Rating (IEC 60903)

    -

    Not tested - enter the measured value. Acceptance: Insulating glove maximum use voltage must be >= nominal phase-to-phase system voltage V_sys [IEC 60903 / ASTM D120 / NFPA 70E §130.7(C)(7)]

    Pending

  • Protective Device Arc Clearing Time

    - s

    Not tested - enter the measured value. Acceptance: Incident energy scales linearly with arc duration t_arc; above 0.50 s engage Maintenance Mode (RELT / ZSI) or lower instantaneous pickup [IEEE 1584-2018 §6 / NEC 240.87]

    Pending

Verification Checklist (0 / 20)

Pending

  • 1Arc flash hazard calculation study current within 5-year review cycle and updated after grid changes [NFPA 70E §130.5(G)]

  • 2Equipment durable warning label displays nominal voltage, Arc Flash Boundary, and Incident Energy (or PPE Category) [NFPA 70E §130.5(H)]

  • 3Limited Approach, Restricted Approach, and Arc Flash Boundary taped/barricaded prior to work [NFPA 70E Table 130.4(E)(a)]

  • 4Energised Electrical Work Permit (EEWP) signed by safety manager where equipment is not placed in an electrically safe work condition

  • 5Lockout / Tagout (LOTO) energy control procedure verified and try-start / absence-of-voltage test (Live-Dead-Live) completed

  • 6NEC 240.87 arc energy reduction system (Zone Selective Interlocking, Maintenance Switch RELT, or Arc Flash Relay) tested for breakers >= 1200 A

  • 7Dielectric insulating rubber gloves (IEC 60903 Class 00-4) air-roll checked before use and within 6-month dielectric re-test date

  • 8Leather protectors worn over rubber insulating gloves and free of embedded metal particles

  • 9Arc-rated garment / flash suit ATPV or EBT rating (cal/cm2) >= calculated incident energy at working distance

  • 10Arc-rated face shield with wrap-around chin cup or balaclava hood (mandatory above 4 cal/cm2) worn and uncracked

  • 11Non-melting 100% cotton/wool undergarments worn beneath arc-rated outer clothing (zero polyester/nylon)

  • 12Dielectric hard hat (Class E, 20 kV proof-tested) and insert hearing protection worn inside Arc Flash Boundary

  • 13Insulated hand tools VDE-certified to IEC 60900 (1000 V AC / 1500 V DC) with dual-layer insulation intact

  • 14Voltage detector / multimeter and test leads rated CAT IV 600 V / CAT III 1000 V (IEC 61010-1) with HRC fused probes

  • 15Insulated rescue hook (FRP) and automated external defibrillator (AED) staged outside the Arc Flash Boundary

  • 16Standby qualified safety observer assigned with no other duties during energised troubleshooting

  • 17Remote racking and remote breaker close/trip pendant or chicken-switch used to keep operator outside AFB

  • 18Switchgear hinged doors bolted/latched closed and arc-resistant plenum vents unobstructed prior to energisation

  • 19Qualified worker NFPA 70E / contact release / CPR training verified within 3-year validity window

  • 20Post-job briefing and near-miss / protective setting audit log archived

General Notes

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Free plan: 5 of 5 inspections / calculations left this month.