What is the purpose of an earth system?

• A. To provide a protective device to shut off faults.
• B. To carry current to the loads.
• C. To convey electrical energy away safely, preventing shock or fire.
• D. To increase fault current to ensure immediate tripping.

Answer: (C)

The main idea is that the earth system provides a safe, low-impedance path to ground for any fault current. By directing fault currents away from exposed metal parts and toward the earth, it keeps those parts at or near earth potential, which reduces touch voltage and the risk of electric shock. This arrangement also ensures protective devices (fuses or breakers) can detect the fault and trip quickly, interrupting the power before a fire or serious injury can occur.

It’s not a device that by itself stops faults, nor is it the path used to carry normal supply current to loads. It’s specifically about giving faults a safe route to earth so protective devices can operate reliably, rather than purposefully increasing fault current.