What is the primary safety function of the green insulated earth wire in a domestic circuit, particularly for metallic appliances?
- A.To act as the neutral wire when the black wire fails
- B.To provide a high-resistance path to divert excess current into the ground
- C.To provide a low-resistance path to ensure leakage current keeps the appliance potential to that of the earth, preventing severe shocks
- D.To stabilise the voltage at 220 V