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Correct wiring method for power sockets and plugs

Update:11-05-2019
Summary:

Face the socket and press the correct connection of the […]

Face the socket and press the correct connection of the left zero (N) right fire (L) to the ground (E). Firewire-L (red, yellow, blue), neutral-N (blue or black), ground-E (yellow-green). Three-phase four-wire transmission of power in a low-voltage grid, three of which are phased (Fire line) represents A, B, C three phases, a neutral line N (zero line). In order to ensure the safety of electricity consumption, the user's use area is changed to use three-phase five-wire system. The fifth line is the ground protection line PE (ground line), one end of which is buried deep underground in the vicinity of the user area with metal conductors. The other end is connected to the ground connection of each user and functions as a grounding protection.
The ground wire is a line that reliably connects the ground of the equipment or the electrical appliance to the earth, and is a good solution to prevent electric shock accidents.
Proper grounding increases the overall system's immunity to interference.
Most of the power outlets we use are single-phase three-wire sockets or single-phase two-wire sockets.
If the wires are not wired according to the standard specifications, the neutral and ground wires are difficult to distinguish. If the power supply has a leakage protector, plug the socket into the appliance. If it trips, the root of the zero line is actually the ground wire; if it does not jump, it will be connected.
It is best to use the standard specification of the wire color in the application: yellow for the A line, green for the B line, red for the C line, light blue for the N line, and yellow green for the PE line.
In a single-phase lighting circuit, generally yellow indicates a live line, blue is a neutral line, and yellow-green is a ground line. In some places, red is used to indicate the fire line, black is the neutral line, and yellow and green are the ground lines.
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