What color is the neutral wire in a standard AC electrical system?

• A. Black
• B. White
• C. Green
• D. Red

Answer: (B)

The key idea is how electrical conductors are color-coded to show their roles. In a standard AC system, the hot conductors (which carry current) are typically black (and sometimes red for a second hot). The neutral conductor, which provides the return path for current, is identified by white. The grounding conductor is green or bare. This color scheme helps you quickly recognize which wire is carrying live voltage and which is simply returning current or providing a safety ground.

White is used for neutral because it clearly differentiates it from the hot wires, reducing the risk of someone accidentally touching a live conductor. The green wire is reserved for grounding and should not carry current in normal operation. If a white wire is ever used as a hot in a modified circuit, it must be re-identified with tape or another color to avoid confusion.