Which color is used to represent 110 volts in standard electrical color coding?

• A. Yellow
• B. Blue
• C. Red
• D. Green

Answer: (A)

Color coding is used to identify voltage levels at a glance, which helps prevent mistakes and increases safety. In this scheme, 110 volts is indicated by yellow, giving a distinct cue that separates it from other voltages and from neutral or grounding conductors. The bright, unique color makes it easier to recognize a 110 V circuit quickly, reducing the risk of plugging the wrong device or wiring into the wrong supply. Keep in mind that color codes can vary by country and installation, so always follow the local standard. For comparison, blue is commonly used for neutral or other voltage schemes, red often marks another hot leg in multiwire circuits, and green is reserved for earth/ground.