Live wires: Brown (L1), Blue (L2), Black (L3); Neutral wire: Light blue; Ground wire: Yellowgreen twocolor. These color codes are used for electrical distribution systems, and while some are mandatory, others are optional. Using the correct wiring color codes is crucial for identifying line, neutral, and ground wires, which saves time, simplifies maintenance and troubleshooting, and ensures the safety of. The IEC Wiring Color Code Standards are globally recognized guidelines established by the International Electrotechnical Commission (IEC). For typical building AC circuits (commonly up to 600 volts nominal), the NEC specifies identification rules for grounded conductors (neutral), requirements. In the U.