Which color indicates 230V?

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

Answer: (A)

Color coding is used to quickly identify which conductor carries the mains potential. In the convention used for this item, blue is assigned to indicate the conductor that carries the 230V supply. That makes blue the best choice because it directly signals the live line in this particular scheme, helping distinguish it from other conductors like earth or reference lines. Remember that actual codes vary by region and standard, so always verify with the wiring diagram and, if in doubt, test with a meter.