Comprehensive Overview and Comparison of ANSI Versus IEC Short-Circuit Calculations: Using IEC Short-Circuit Results in IEEE 1584 Arc Flash Calculations

In this paper, we review both ANSI/IEEE and IEC short-circuit calculation methods. We discuss and compare terminology, definitions, and calculation approaches. The advantages and disadvantages of both standards with numerical examples are presented. Identical systems are analyzed using both methods to make a side-by-side comparison of the results. After both methods are introduced in detail and understood, arc flash calculation examples will be provided using IEC short-circuit calculations. Currently, all arc flash calculation methods (including IEEE 1584) focus on three-phase fault currents without being limited to any specific short-circuit standard. In our approach, the IEC method can be effectively used for arc calculations. This approach can be utilized in regions of the world where IEC standards are used for short-circuit calculations.