What are the classifications of ground wires?

There are two types of grounds for the ground wire, namely the system ground and the protective ground. The task of system grounding is to establish a zero potential reference point; the task of protective grounding is to protect personal safety. For protective earthing, its tasks are:

A) Provide a low-impedance connection between the equipment and the grounding body, thereby also reducing the risk of personal electric shock injury;

B) Provide a low-impedance path back to the mains for ground-fault current to operate a fuse or circuit breaker.