Which color combination identifies a ground conductor in typical US installations?

• A. White.
• B. Blue.
• C. Green or bare copper.
• D. Black.

Answer: (C)

In electrical color coding, the grounding conductor is identified by green or bare copper. The green (or green with yellow stripes in some cases) and bare copper wires serve as the safety path that bonds metal parts and the electrical system to earth, so fault currents have a low-impedance route to trip protective devices. This helps prevent shock and equipment damage. White wires are reserved for neutral, which returns normal circuit current; black wires are typically hot conductors that carry live current; blue is commonly used as a traveler or a secondary circuit in some systems, not for grounding. So green or bare copper uniquely identifies the ground path in typical US installations.