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Wire colour code

Wire colours per IEC 60446: phase, neutral, earth. Standard marking in single-phase and three-phase circuits, colours in different countries.

Cable cross-sections and ampacityCircuit breaker ratingsElectrical schematic symbols (GOST/IEC)IP protection ratingsRCD types and selectionEarthing systems TN-C, TN-S, TN-C-S, TT, ITWire colour codeBreaker selectivityGenerator selection: petrol or dieselATS and backup powerUPS: types and selectionSolar power plants: types and calculation🌍 World rules

Standard colours (IEC 60446)

ConductorColourNote
Phase L (single-phase)BrownBlack, grey also allowed
Phases L1/L2/L3Brown / black / greyThree-phase
Neutral NBlueAlways blue
Earth PEGreen-yellowPE only
Rule: green-yellow is only for PE; blue only for N. If unsure, test with a meter.

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Data is for reference. Final design decisions must follow current regulations and a qualified engineer.