Inflection Point Engineering Calculators

Short Circuit & Arc Flash Screening

Bolted-fault current estimate at a transformer secondary using the per-unit method (utility + transformer), plus a simplified IEEE 1584 incident-energy screen and an NFPA 70E PPE category lookup. For screening use only — never a substitute for a formal short-circuit / arc-flash study.

Standards: IEEE 1584-2018 (arc-flash hazard calculations), NFPA 70E-2024 (electrical safety in the workplace), IEEE 141 (Red Book), IEEE 242 (Buff Book). Method: per-unit method for short circuit (infinite-bus conservative); IEEE 1584-2002 simplified empirical formula for incident energy — does not implement the full 2018 IEEE 1584 model. For any real arc-flash study use SKM, ETAP, or EasyPower.