In most residential and commercial electrical installations in North America, the standard color for ground wires is green or bare copper. ● Easy Identification: The colors immediately tell you the purpose of the wire. ● Simple Maintenance: Future repair or upgrade is easier and safer. Wiring is used the same way everywhere. Brown for live - Live wire means that the wire is connected to the main supply. Green for. The IEC 60446 standard, “Basic and Safety Principles for Man-Machine Interface, Marking, and Identification,” establishes global guidelines for identifying electrical equipment terminals, conductors, and wiring colors. 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 new wiring color codes for different supply systems in the UK/EU, as per IEC, are defined as: Three-phase system: The preferred wiring color codes for a three-phase four-wire system are as follows: Single-phase system: The following wiring color codes for a single-phase system are as follows:. Wiring color codes used for electrical wiring has a specific meaning with different colors for different types and purposes of circuits. For those who want to learn, a simple guide can help to understand their meaning.