Fault Loop Impedance Calculation Jun 2026
, you must compare it against the maximum permitted values found in your local electrical regulations (e.g., BS 7671).
Zs=Ze+(R1+R2)cap Z sub s equals cap Z sub e plus open paren cap R sub 1 plus cap R sub 2 close paren Breaking Down the Components: Zscap Z sub s
$$Z_s = Z_e + R_{1+2} \text{ (hot)}$$ $$Z_s = 0.35 + 0.557$$ $$Z_s = 0.907,\Omega$$