You will see European Standards start with EN, as a comparison to US which is predominantly driven by IEEE standards. EN standards are approved by CENELEC.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
Although many countries will have there own standards, e.g. UK uses BS, Germany uses DIN & VDE, the number that follows is in most cases consistent with the same number as IEC (International Electrotechnical Committee). The reason they will have there own is due to in country nuances that are too prevalent to ignore or try to modify to be 100% consistent with the IEC standard, or in some cases local conditions require modification, although my experience has been that the differences are usually minimal.
For installation practices, most non-US countries follow the IEE wring regulations (BS-7671), which is their equivalent to the NEC here in the US.
However, the OP asked for color standards, which in many cases do not exist. Typically, they have been generally accepted by location, but even the NEC does not set a color code, except for orange for the high-leg, gray or white for grounded conductor, and green for earthing.
The practice of Brown/Orange/Yellow and Black/Red/Blue has been widely used, but is not required. And the orange commonly used for the middle phase on a 480Y/277V, IMO actually conflicts with the NEC 110.15.