European IEC wiring color codes for AC supply are as follows: 3 Phase, Line 1 – Brown 3 Phase, Line 2 – Black 3 Phase, Line 3 – Grey Neutral – Blue Ground – Green with Yellow Stripe DC supply has multiple configurations, and the color assignment for each conductor varies. European IEC wiring color codes for AC supply are as follows: 3 Phase, Line 1 – Brown 3 Phase, Line 2 – Black 3 Phase, Line 3 – Grey Neutral – Blue Ground – Green with Yellow Stripe DC supply has multiple configurations, and the color assignment for each conductor varies. Electrical engineers, contractors, traders, manufacturers, and especially electricians worldwide rely on different wiring color codes for wire and cable installations in industrial buildings and residential homes. These color codes are used for electrical distribution systems, and while some are. The wiring color codes are the standard safety language of electricity. This guide covers European wire color codes for both AC (Alternating Current — mains and wall outlet power) and DC (Direct Current — batteries and electronics) supply wiring. Master NEC wire color codes for hot, neutral, ground, 3-phase, and DC conductors — with code references, a full color table, and common inspection violations to avoid. Wire color codes are not merely convention — they are a safety requirement enforced by the National Electrical Code (NEC), NFPA 70. Electrical wiring colours can vary from country to country, the age of the. Whether you're installing a new outlet, fixing a light fixture, or troubleshooting a circuit, understanding the wire color code is essential. What Is a Wire Color Code? Think.