Before revision: Color codes + Standard wire insulation colours for alternating current StandardRegion or country Phases (L, L1/L2/L3) Neutral (N) Protective earth/ground (PE) IEC 60446 European Union from April 2004 United Kingdom from April 2004 (BS 7671) Switzerland from 2005 Argentina Hong Kong from July 2007 Singapore from March 2009 Russia from 2009 Ukraine, Belarus, Kazakhstan South Korea from January 2021 Australia and New Zealand Italy Prohibited: 80px| Green/Yellow 80px| Brown 80px|Black Grey|80pxSwitzerland before 2005 also red and white for phases.
After revision: Color codes + Standard wire insulation colours for alternating current StandardRegion or country Phases (L, L1/L2/L3) Neutral (N) Protective earth/ground (PE) IEC 60446 European Union from April 2004 United Kingdom from April 2004 (BS 7671) Switzerland from 2005 Argentina Hong Kong from July 2007 Singapore from March 2009 Russia from 2009 Ukraine, Belarus, Kazakhstan South Korea from January 2021 Australia and New Zealand Italy 80px| Brown 80px|Black Grey|80pxSwitzerland before 2005 also red and white for phases.