NCCER The Electrical Industry (26101-23) Practice Test

Color coding for conductors shows their function. The equipment grounding conductor is green or bare copper, used to bond metal parts and provide a safe path to earth in case of a fault. This is why you’ll see green (or green with yellow) insulation, or a bare copper wire, as the grounding conductor. Hot conductors are black or red, carrying current, and neutral is white. So, in a typical 120/240 V residential system, the grounding conductor is green or bare copper.