IEEE 1584-2018 arc-flash calculation
The empirical model calculates arcing current at voltage anchor points, applies geometry and enclosure corrections, then repeats the energy calculation for reduced arcing current.
Iarc,min = Iarc × (1 − 0.5 × VarCf)E = IEEE1584(Voc, Ibf, Iarc, G, D, EC, CF, t)AFB: E(AFB) = 1.2 cal/cm²where:
- Iarc
- Predicted normal arcing current[kA]
- Iarc,min
- Reduced arcing current used for the second clearing-time scenario[kA]
- Ibf
- Bolted three-phase fault current[kA]
- G
- Conductor gap[mm]
- D
- Working distance[mm]
- EC
- Electrode configuration
- CF
- Enclosure size correction factor
- AFB
- Arc-flash boundary[mm]
IEEE 1584 predicts thermal incident energy and boundary; it does not select PPE or authorize energized work.
How to use the Arc Flash Incident Energy Calculator – IEEE 1584-2018
Calculate IEEE 1584-2018 arcing current, incident energy, and arc-flash boundary for normal and reduced-current clearing-time scenarios. Start by choosing the operating mode, then enter values from nameplates, measurements, or project documents in the units shown. The result updates immediately and keeps intermediate quantities visible for review.
- Confirm the system and calculation mode.
- Enter measured or manufacturer-rated values.
- Review the primary result and intermediate metrics.
- Continue with the related protection or equipment-selection checks.
Calculation method and validation
The equations and symbol definitions above show the complete calculation basis. Inputs are checked before calculation so zero, negative, incompatible, or physically impossible combinations are flagged instead of silently producing a misleading result.
How to interpret the result
Use the main result as a starting value and read every supporting metric. Three-phase 50/60 Hz AC system within the IEEE 1584-2018 model range Bolted fault current comes from a current short-circuit study Each clearing time includes relay sensing, intentional delay, breaker mechanism, and interruption time at the calculated arcing current A passing or recommended result means the entered mathematical conditions are satisfied; it does not certify the complete installation or a particular product combination.
- Three-phase 50/60 Hz AC system within the IEEE 1584-2018 model range
- Bolted fault current comes from a current short-circuit study
- Each clearing time includes relay sensing, intentional delay, breaker mechanism, and interruption time at the calculated arcing current
Selection limits and next checks
This calculator does not replace a site-specific arc-flash study, protective-device coordination study, equipment inspection, or qualified electrical safety assessment. IEEE 1584 does not recommend PPE or determine whether energized work is justified. Do not convert the result automatically into a PPE category. Use the exact protective-device curve at both displayed arcing currents; a reduced current can produce a longer clearing time and higher incident energy. Compare the output with the current applicable standard, local rules, exact VIOX product datasheet, environmental conditions, protection coordination, and the engineer's project requirements before procurement or installation.
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Assumptions
- Three-phase 50/60 Hz AC system within the IEEE 1584-2018 model range
- Bolted fault current comes from a current short-circuit study
- Each clearing time includes relay sensing, intentional delay, breaker mechanism, and interruption time at the calculated arcing current
Important Warnings
- This calculator does not replace a site-specific arc-flash study, protective-device coordination study, equipment inspection, or qualified electrical safety assessment.
- IEEE 1584 does not recommend PPE or determine whether energized work is justified. Do not convert the result automatically into a PPE category.
- Use the exact protective-device curve at both displayed arcing currents; a reduced current can produce a longer clearing time and higher incident energy.