Arc Flash Incident Energy Calculator (IEEE 1584-2018)
Calculate incident energy, arcing current, PPE category, and arc flash boundary using the IEEE 1584-2018 model with all five electrode configurations
Free arc flash incident energy calculator for plant electricians, safety managers, and E&I technicians who need a quick screening estimate before opening a panel or pulling a bucket. Enter system voltage, bolted fault current, protective device clearing time, working distance, and electrode configuration. The calculator runs the full IEEE 1584-2018 model at three reference voltages (600V, 2700V, 14300V), interpolates to your actual system voltage, applies the enclosure size correction factor, and evaluates both normal and reduced arcing current scenarios. The higher incident energy governs. Results include arcing current in kA, incident energy in cal/cm2, PPE category per NFPA 70E-2024 Table 130.7(C)(15)(c), arc flash boundary in feet and inches, and shock approach boundaries per Table 130.4(E)(a). Equipment presets from IEEE 1584-2018 Table 1 auto-fill conductor gap, working distance, and enclosure dimensions for common equipment types: switchgear, MCCs, panelboards, switchboards, cable junction boxes, and open-air configurations. For voltages above 15 kV (outside the IEEE 1584 model range), the calculator switches to the Ralph Lee method. This is a screening tool. It does not replace a formal arc flash hazard analysis by a qualified electrical engineer per NFPA 70E 130.5.
Look up PPE category from the NFPA 70E table method without running the full IEEE 1584 calculation
PPE Category Table Method →Look up shock approach boundaries for any voltage
Shock Approach Boundary Calculator →Generate a printable energized work permit per NFPA 70E 130.2(B)
Energized Work Permit Generator →Calculate available fault current at a transformer secondary
Fault Current Calculator →How It Works
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Select Equipment Type
Choose from the equipment preset dropdown. This pre-fills conductor gap, working distance, enclosure dimensions, and electrode configuration from IEEE 1584-2018 Table 1. You can override any value.
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Enter System Parameters
Enter system voltage (V), bolted fault current (kA) from your short circuit study, and protective device clearing time in cycles or milliseconds. Enter clearing times for both normal and reduced arcing current from your time-current curves.
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Review Results
The calculator shows incident energy (cal/cm2), PPE category, arc flash boundary, arcing current at normal and reduced levels, and shock approach boundaries. The governing case (higher incident energy) is highlighted.
Frequently Asked Questions
Learn More
Arc Flash Incident Energy: What the Numbers Mean and How to Get Them Right
IEEE 1584-2018 arc flash calculation explained step by step. Arcing current, incident energy, reduced current scenario, PPE categories, and practical interpretation of results.
Arc Flash PPE Table Method: When to Use It and When You Can't
NFPA 70E Table 130.7(C)(15) PPE category lookup explained. When the table method works, when it doesn't, what exceeds table scope, and how to read PPE categories.
Shock Approach Boundaries: Who Can Cross Which Line
NFPA 70E shock approach boundaries for AC and DC systems. Limited, restricted, and prohibited distances, who needs what training, and what PPE is required at each boundary.
Energized Electrical Work Permits: When You Need One and How to Fill It Out
NFPA 70E 130.2(B) energized electrical work permit requirements. When energized work is justified, what goes on the form, and the approval process.
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