Why are there four wires on a high power socket in the kitchen?

1. The three wires in all one tube are the phase, zero and ground wires of the socket, and the single wire in the other tube is the connection between the kitchen equipotential and the grounding wire of the socket, which must be the construction is not standardized, the single wire should be a two-color line, and the equipotential tiling is wrong when you plug it, and the kitchen equipotential box should be connected with all the metal fittings in the kitchen to ensure the safety of electricity in the water room.

According to the requirements of the national standard equipotential connection, all metal items in the kitchen: heating, exchangers, water heaters, metal showers, alloy swing doors, etc., should be connected with the local equipotential in the kitchen, and the pipeline should be concealed during the decoration period, which is a safety measure to prevent accidents in the kitchen. The reinforcement mesh in the wall is connected) If a person stands on the ground and touches these metal objects, there will be no potential difference, so there will be no accidents. Just as a bird standing on a high-voltage line will not be electrocuted.

After the potentiometer is plugged, it cannot be repaired.

If a person only touches the charged body, the rest of the body will not be electrocuted if it does not touch the conductor, because it is fixed on the wall, so as long as you connect all the metal conductors in the kitchen, so that they are connected together, and the whole kitchen forms the same potential, people are safe in the kitchen.

The kitchen is where the power is used! This can only be measured with a meter, what is the voltage between red + green + blue of the original line? Whether:

Red + Green = 380V?Red + Blue = 220V?Green + Blue = 220V?

You can't guess the things of the line! And you have your own set of 220V single-phase electricity! (black and yellow lines).

The green line should not be a phase line of the return route! Why use 4 types of threads? The purpose is that the kitchen has a lot of power, and you can consider three-phase balancing!

The power is balanced so that the green (phase wire) comes into play.

There aren't enough wires. The green line connects to other places.