Which color indicates 230 volts in common electrical color coding?

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

Answer: (B)

The main idea here is how conductors are color-coded in common 230V AC systems. In many standards, blue is used to identify the neutral conductor, which is the return path in a 230V circuit. That makes blue closely associated with the 230V system because it marks the side of the circuit that completes the supply path back to the source. The live conductor is typically brown (or red in older codes), and the earth/ground is green-yellow. So blue stands out as the color tied to the neutral of a 230V system, which is why it’s the best match for indicating that voltage context. The other colors have their own roles—green for earth, red or yellow for live conductors in some older schemes—but they do not denote the neutral/return path in the 230V setup.