Probably the three most common types here are:
1. Yellow, 2-pole+ground, 110V. Used for building-site power tools.
2. Blue, 2-pole+ground, 240V. Used almost everywhere for regular 240V single-phase hook-ups, including campsites etc.
3. Red, 4-pole+ground for 240/415V three phase. Used extensively in industrial work.
Note that the voltage color coding is based on the maximum voltage present between any two poles, e.g. a 2-pole+ground connector for single-phase 127V would be yellow, but a 4-pole+ground type for 3-phase 127/220 would be blue.
