How to Rewire Green, Black & White to a 3 Three Prong Mar 20, 2018How to Rewire Green, Black & White to a 3 Three Prong Extension Cord How to Rewire Green, Black & White to a 3 Three Prong Extension Cord. Lightweight indoor cords may be 16-gauge, but these usually have two-prong polarized plugs instead of three-prong ones, which means they don't have a green ground wire.Author: Chris Deziel How to Wire a 3 Prong Plug With Red & Black Wires | Hunker The black and red wires are used as hot wires, and each will carry 110 volts of electricity to the appliance. The white wire is the return and carries current back to its source. In addition to the black, red and white conductors, most cable has a bare-copper or green ground wire.
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