Arc Flash Calculator
IEEE 1584:2018 — Electrical Safety & PPE
Inputs
Line-to-line or phase-to-neutral
Maximum available short-circuit current
Time until protection operates
Distance from arc source (typically 450 mm)
Enclosed increases incident energy
Results
Incident Energy
1340.33
cal/cm²
Required PPE Category
⛔ DANGEROUS
Recommended PPE
DANGEROUS — Do NOT work live. Arc flash energy exceeds safe exposure limits. Implement engineering controls (insulation, guarding, remote operation) or de-energize.
⚠️ High Arc Flash Hazard
Incident energy >25 cal/cm². Avoid live work if possible. Use remote racking or other de-energized methods.
Arc Flash Analysis — IEEE 1584:2018
Arc flash is a sudden release of thermal and radiant energy during an electrical fault. This calculator determines the incident energy (cal/cm²) and corresponding PPE (personal protective equipment) category required for safe work on energized electrical equipment. Results must drive safety protocols and labeling on switchboards and distribution equipment.
Electrode Configurations
- VCB: Vertical configuration, cable insulation in the arc chamber, bare bus.
- VCBB: Vertical configuration, cable insulation, bare bus outside chamber.
- HCB: Horizontal configuration, cable in chamber, bare bus.
- VOA: Vertical configuration, open air (no chamber), insulated and bare bus.
- HOA: Horizontal configuration, open air, insulated and bare bus.
Key Parameters
- Bolted Fault Current: Maximum available fault current at the arc location.
- Arc Duration: Time fault is allowed to persist before protective device operates.
- Working Distance: Distance of worker >face from arc source (typically arm's reach).
- Gap Between Conductors: Affects arc voltage and energy release. Smaller gaps increase energy.
- Enclosure Type: Open air vs enclosed. Enclosures confine and amplify arc energy.
PPE Categories
- Category 1 (<1.2 cal/cm²): Cotton clothing adequate.
- Category 2 (1.2–8 cal/cm²): Fire-resistant shirt and pants.
- Category 3 (8–25 cal/cm²): Aluminized proximity suit + face shield.
- Category 4 (>25 cal/cm²): Full hazmat suit + SCBA. Avoid work if possible.
Disclaimer: These results are indicative only. Arc flash hazard analysis must be performed by a qualified electrical engineer in accordance with IEEE 1584:2018, AS/NZS 3000:2018, and applicable electrical safety standards. All calculations must be verified and documented in hazard label compliance before workers perform live-work procedures.