Color of the electrical connection in the distribution box

In a distribution box, wire colors indicate function: brown or black for live, blue or gray for neutral, and green/yellow for ground.Standard Wire ColorsLive (Phase) Wires:In IEC-compliant systems (common in Europe, UK, and many other countries), brown is used for single-phase live, and in three-phase systems, brown, black, and gray represent the three phases .In NEC-compliant systems (U.S.), black is typically Line 1, red is Line 2, and blue may be used for Line 3 in three-phase circuits . Neutral Wires:IEC standard: blueNEC standard: white or gray The neutral wire completes the circuit and carries current back to the source . Ground (Earth) Wires:IEC standard: green/yellow stripedNEC standard: green or bare copper Ground wires provide safety by preventing electric shock and are connected to the distribution box's metal frame or earth rod .Additional NotesOlder installations may use different colors, so always verify with a tester before handling wires .DC systems often use red for positive and black for negative, but this can vary depending on local standards .Safety first: Wire color indicates intent, not guaranteed function. Always test wires before touching or connecting them . Understanding these color codes ensures safe installation, maintenance, and troubleshooting of electrical systems in residential, commercial, and industrial settings .