How to Convert 2-Wire House Wiring to 3-Wire Ground | Hunker Sep 17, 2018Two-wire house wiring can be dangerous because it carries the risk of causing an electric shock. Three-wire electrical systems minimize the risk of electric shock. They also allow surge protectors to keep your electrical equipment safe. The Box Must Be GroundedAuthor: Heather Skyler 2 Wire and 3 Wire Cables - Ask-The-Electrician A 2-wire (black and white with the ground) cable will be used for one hot and one neutral or one circuit. 3-Wire Circuit A 3-wire circuit (black, red, white and the ground) cable can be used for feeding two circuits that will share the neutral and ground wire.