What is the correct wiring method for the power cord of the socket and plug?


Facing the socket, please follow the correct connection […]

Facing the socket, please follow the correct connection method of left zero (N) right fire (L) and ground (E). Front-L (red, yellow, blue), neutral-N (blue or black), ground-E (yellow-green). On the top of the low-voltage power grid, a three-phase four-wire system is used to transmit power, including three phase wires (Front) represents three phases A, B, C, and a neutral line N (zero line). In order to ensure the safety of electricity use, the user's application area is changed to a three-phase five-wire system for power supply. The fifth wire is the grounding maintenance line PE (earth wire), one end of which is buried in the ground with a metal conductor near the user area , The other end is connected to the ground contact of each user, which has the effect of grounding maintenance. The ground wire is a circuit (power wire) that connects the casing of the equipment or electrical appliance firmly to the ground, and is an excellent solution to prevent electric shock. Correct grounding can improve the anti-interference ability of the entire system. Most of the power sockets we use are single-phase three-wire sockets or single-phase two-wire sockets. 

The left pole of the single-phase 2-hole socket is connected to the N line (zero line), the right pole is connected to the L line (front); the left pole of the single-phase three-hole socket is connected to the N line, the right pole is connected to the L line, and the middle pole is connected to the E line (Maintenance ground); the left pole of the three-phase 4-hole socket is connected to the L3 line (front 3), the right pole is connected to the L1 line (front 1), the upper pole is connected to the E line, and the lower pole is connected to the L2 line (front 2).

The single-phase three-wire power plug is used for all household appliances whose shell is metal. The three plugs are arranged in a positive three-solution shape, and the longest and thickest copper plug on the top is the earth wire, which has a special grounding symbol. The two below the ground wire are the front (the sign letter is "L" Live Wire) and the zero wire (the sign letter is "N" Neutral wire), and the order is left zero and right fire. If the wire color is not in accordance with the standard specification, the neutral wire and the ground wire are difficult to distinguish. If the power supply has a leakage protector, plug the socket into the electrical appliance. If it trips, clarify that the ground wire is the ground wire; if it does not jump, it is connected correctly. Use standard wire colors in the application: A wire uses yellow, B wire uses green, C wire uses red, N wire uses light blue, and PE wire uses yellow-green. In single-phase lighting circuits, generally yellow indicates the front, blue is the neutral line, and the yellow-green alternate is the ground. In some places, red color is used to indicate the front, black power line indicates the zero line, and the yellow and green alternately are the ground wire. Front (English Live Wire) L is generally red or yellow or green neutral wire (English NEUTRAL) N (neutral wire) is generally blue ground wire (English EARTH) E is generally yellow-green or black three-pole power plug, as shown below As shown, the shell of the electrical equipment is connected to the ground terminal of the three-core power plug through a wire, and this plug needs to be pierced into the three-pole socket.  
In practice, some old-style house wiring does not follow the world standard, so it is recommended to test it with an electric pen before wiring.