Which of the following is used for safety measures?
Earth wire
The earth wire which has the insulation of green color is usually connected to a metal plate buried deep in the earth near the house. This is used as a safety measure, especially for those appliances that have a metallic body, for example, electric press, toaster, table fan, refrigerator, etc. The metallic body is connected to the earth wire, which provides a low-resistance conducting path for the current.