Using the circuit data provided
Ze 0.32O
Conductor resistance 7.41mO/m
Circuit length 38 m
The measured earth fault loop impedance for the circuit would be
A) 0.563â„¦
B) 0.883â„¦
C) 0.442â„¦
D) 0.281â„¦

Question

Quizplus · Accepted Answer

The earth fault loop impedance (Zs) is calculated by adding the external earth impedance (Ze) and the impedance of the circuit conductors. The conductor impedance is the resistance per meter multiplied by the circuit length. Thus, Zs = Ze + (conductor resistance * circuit length) = 0.32 + (0.00741 * 38) = 0.883Ω.

Using the Circuit Data Provided