Short Circuit Current Calculator

Calculate available fault current at a point in the electrical system using impedance method.

Line-to-line voltage.
V
Transformer rating.
kVA
Transformer impedance percentage.
%
Length of cable from transformer to point.
ft
Cable impedance in ohms per 1000ft.
Ω/1000ft

Results

Fault Current at Transformer-A
Fault Current at Point-A
Total Impedance-Ω
References: IEEE Std 141 (Red Book); IEEE Std 551 (Violet Book); NEC 110.9