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I talked about 3 phases plug and socket.
Home plugs include phase, neutral and ground.
3 phase plugs have 5 tips.
Because they have 3 phases, neutral and ground.
Representing the colors of the wires: Green--> ground Blue--> neutral
Brown --> 3 phases
What we need to know? Phase-Phase --> 380Volts Phase- Neutral -->220Volts
Phase- Ground -->220Volts Neutral-Ground --> 0Volt
We understand that which are phases,ground and neutral by measuring with multimeter.
We set up multimeter 750 AC Voltage for measuring the 380 AC voltage.
We see that 377 Volts approximately 380 Volts so that these are phases.
We've already known that ground socket input is thicker than the others.
This is nearly 220 V so this is ground.
And we also see neutral and ground give us 0 V.