Impedance Calculator | Fault Loop

External impedance (from the supply transformer to the installation). R1cap R sub 1 Resistance of the line (phase) conductor. R2cap R sub 2 Resistance of the circuit protective conductor (CPC/earth).

That’s your .

$$Resistance = \textValue per meter \times \textLength$$ $$Resistance = 0.01951 \times 20 = 0.39 \Omega$$ fault loop impedance calculator