Guys,
can anyone explain the how the following answer to this question is derived ( its from an old test paper) which my son is doing,
The maximum tabulated value of earth fault loop impedance for a circuit is: 1.65 ohms, if the resistance of the line to cpc of a new circuit is 1.13ohms the maximum accepted external earth fault loop impedance is:
A. 0.52 OHMS
B. 0.45 OHMS
C. 0.35 OHMS
D.0.20 OHMS
The answer given to him is "D" but no explanation as to how its worked out,
really appreciate any feedback!!
