According to International Electrical Commission standard IEC60445:2017, for AC power the following color codes should be used.
Check if the country where you are adheres to the standard!
See also outdated IEC60446.
- Grounding symbol = protective conductor = green/yellow
- N = Neutral conductor = blue
- L = AC Phase conductors
- L1 = brown (or just L for single AC phase)
- L2 = black
- L3 = grey