To ensure the effective operation of the over-current protective devices, the earth fault loop path must have:
A) a 230 V supply
B) a very low resistance
C) fuses or MCBs in the live conductor
D) a very high resistance

Question

Quizplus · Accepted Answer

A very low resistance earth fault loop path is necessary to effectively operate over-current protective devices. This is because the protective devices rely on sensing the difference in voltage between the live and earth conductors. If the resistance in the earth fault loop path is too high, it can prevent the protective device from tripping when it should, and can cause a dangerous situation.

To Ensure the Effective Operation of the Over-Current Protective Devices