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Arc Flash Calculator

Incident energy, arc flash boundary and PPE category. IEEE 1584-2002 and the Ralph Lee theoretical method are free; IEEE 1584-2018 is a subscriber feature.

AAJappsEngineering Calculation Report

Arc Flash Calculator

IEEE 1584-2002/2018, Ralph Lee

Generated

For preliminary engineering use only — always verify results against project-specific standards and a qualified engineer's review before use in a real design.

Calculation method

Method

Empirical model validated for 0.208–15 kV and 0.7–106 kA bolted fault current. Accounts for equipment enclosure, gap and grounding.

Fault & timing

Bolted fault current Ibf

System voltage

Working distance D

Arc duration / clearing time

Equipment & enclosure (IEEE 1584-2002)

Equipment class(sets typical gap/exponent/distance — override below if known)

Enclosure

System grounding

Conductor gap G(auto-filled by equipment class)

Distance exponent x(auto-filled by equipment class)

IEEE 1584-2018 (600 V < Voc ≤ 15 kV)

Subscriber

Electrode configuration

Conductor gap G

Enclosure width(ignored for VOA/HOA)

Enclosure height

Enclosure depth(shallow LV enclosures only)

Note: even once unlocked, this implementation covers 600 V < Voc ≤ 15 kV only — for systems at or below 600 V, 2002 or Ralph Lee remain the methods to use. The enclosure size correction factor is partially verified against IEEE's own Annex D example — treat CF-dependent results as indicative pending full resolution.

Results

Arcing current Ia

12.58 kA

Incident energy

8.57 cal/cm²

Arc flash boundary

1,508 mm (59.4 in)

PPE category

Category 3

Category 3 (arc rating ≥25 cal/cm²)