Notice the grounding electrodes for making an electrical connection with the earth ground ... are connected to the neutral wire. In this case that box is the main breaker panel.

JAMES: So a plug has three main copper wires ... ELLIE: So what the earth wire does is direct the electric current to the ground instead of to the person touching the appliance.

The power input for households is ac as ... The plug contains three wires – the live, neutral and earth wires. In a plug, the live wire (brown) and the neutral wire (blue) are the two wires ...