I remember looking this up the first time I worked on some European equipment and saw those colors.
- Blue Wire: In many international wiring standards (including those commonly used in China), blue is typically the neutral wire. This corresponds to the white wire in the USA system.
- Reddish Wire: A reddish (or red) wire usually indicates the live or hot wire, which carries the current. This corresponds to the black wire in the USA system.
- Yellow-Green Wire: A yellow-green striped wire is almost universally used as the ground wire for safety. This matches the green or bare copper ground wire in the USA system.
