Correct wiring method of power socket and plug
Source:未知Author:admin Addtime:2020-07-04 17:22:54 Click:
When facing the socket outlet, the right connection method of left zero (n) and right fire (L) ground (E) shall be followed. The three-phase four wire system is used for power transmission in low-voltage power grid, in which three phase lines (live line) represent a, B, C three-phase, and one neutral line n (zero line). In order to ensure the safety of electricity use, three-phase five wire system is used for power supply in the user area. The fifth wire is the grounding protection line PE (ground wire). One end of it is buried in the ground with metal conductor near the user area, and the other end is connected with the grounding contact of each user to play the role of grounding protection.
Ground wire is the circuit that connects the shell of equipment or electrical appliances to the earth reliably, and is a good scheme to prevent electric shock accidents.
Correct grounding can improve the anti-interference ability of the whole system.
Most of the power sockets we use are single-phase three wire socket or single-phase two-wire socket.
The common polarity rule of socket connection is shown in the figure below.
The left pole of single-phase 2-hole socket is connected with N line (neutral line), and the right pole is connected with L line (live wire); the left pole of single-phase three hole socket is connected with N line, the right pole is connected with L line, and the middle pole is connected with e line (protective ground wire); the left pole of three-phase four hole socket is connected with L3 wire (live wire 3), the right pole is connected with L1 wire (live wire 1), the upper pole is connected with e line, and the lower pole is connected with L2 line (live wire 2).
All household appliances are made of three single-phase metal plugs. The three plugs are arranged in a three-dimensional arrangement. The longest and thickest copper plug on the top is the earth wire, which has a special grounding symbol.
The two lines below the ground wire are the live wire (the sign letter is "L" live wire) and the zero line (the sign letter is "n" neutral wire), and the order is left zero and right fire.
It is difficult to distinguish the neutral line from the ground wire if the wire is not connected according to the standard specification. If the power supply has leakage protector, plug the socket into the electrical appliance. If it trips, it indicates that the one connecting the zero line is actually the ground wire; if it does not jump, it is connected to the right one.
It is better to use standard conductor colors in application: yellow for a line, green for B line, red for C line, light blue for N line, and yellow green for PE line.
In single-phase lighting circuit, generally yellow means live wire, blue is zero line, and yellow green phase is ground wire. In some places, red is used to indicate the live line, black means the zero line, and yellow and green are ground wires.
Live wire L is usually red, yellow or green
The neutral line is usually blue
Earth wire (earth) e is generally yellow green or black
The three pole power plug is shown in the figure below. The shell of the electrical equipment is connected with the grounding end of the three core power plug through the wire. This plug needs to be inserted into the three pole socket.
In practice, some old house wiring is not in accordance with international standards, so it is better to test it with an electric pen before wiring.