Free calculator · Screening only

Simplified Arc Flash Incident Energy Calculator

A simplified implementation of the IEEE 1584-2018 empirical model for three-phase arcs in common enclosure configurations. Use this for awareness, PPE screening conversations, and to decide whether you need a full study. It is not a substitute for a full arc-flash study by a qualified engineer and must not be used to produce official labels.

Inputs

System voltage (V) Bolted fault current (kA) Arcing time / clearing time (s)

Typical 5-cycle breaker at 60 Hz ≈ 0.083 s. Include relay delay.

Enclosure type Working distance (mm)

610 mm = 24" (IEEE 1584 default for LV switchgear).

Electrode gap (mm)

Result

Estimated incident energy at working distance

—

Estimated arc flash boundary

—

PPE category (NFPA 70E Table 130.7(C)(15)(c))

—

Important disclaimer. The calculation uses a simplified IEEE 1584-2018 model and assumes a single bolted three-phase arc fault with constant arcing current. It does not handle: current-limiting fuse I²t characteristics, two-arc scenarios, dc systems, arc extinguishing, shunt-trip coordination, or complex source impedance. Use only for screening and awareness. Official labels and PPE selection require a full study signed by a qualified engineer.

Want this calculator tied into your asset registry and labeled on every panel? The Arc Flash Risk Module inside Reliability Coach does that. Open the app →