IEC 60304: Low-Frequency Cable Insulation Colours — The “Universal Language” of Electrical Wiring

Yellow-Green=Earth, Blue=Neutral — How Wire Colour Coding Became a Global Standard

IEC 60304:1982 specifies low-frequency cable and wire insulation colour standard sequences. Yellow-Green (PE protective earth), Blue (N neutral), Brown/Black/Grey (L1/L2/L3 phases) — this colour code is the electrical installation “universal language.”

TNLab — Wire colour coding is the simplest yet most life-critical standardization in electrical engineering.

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