Custom 3-Wire AC Power Plug & Connectors

What is a 3 wire plug? Custom 3-wire plug harness. Safety protection function of 3-wire plug. Mains Power Cord, With 3A Fuse, Mains Plug, US ~ UK to IEC 60320 C5, 1 m, 3 A, 250 VAC, Black.

A 3-wire plug has a live wire, a neutral wire, and a ground wire. The function of the 3-wire plug is to better protect the safety of the staff using the household appliances with the outer metal shell, so as to prevent the staff from causing fatal accidents due to electric leakage and electric shock during use.

US standard three plug power cord

Introduction of 3-wire plug
Three-phase electricity refers to three live wires of different phases, and the voltage between each two wires is 380 volts. Generally used in power systems. Household appliances generally use single-phase power supply. Its 3 wires are live wire, neutral wire (neutral wire) and ground wire. The voltage between live wire and neutral wire is 220 volts, so this is not three-phase electricity. Its plugs and sockets are not three-phase plugs and sockets (but single-phase 3-hole sockets). One more ground wire is added to ensure safety (in the neutral point ungrounded system, the protective grounding can be used. In the neutral point grounded system, the protective ground connection must be used).
Household appliances generally have a motor with low power, which is often in a state of slight vibration during operation, and the insulation between the coil and the motor casing is easily damaged and causes leakage. The function of the ground wire is to guide the leakage into the ground, so as to ensure safety. In addition, the induced current formed by the distributed capacitance between the coil and the motor can also be guided into the ground through the ground wire. However, the electrical safety issue of household appliances needs to be jointly studied by the electrical appliance industry and the construction sector before it can be completely resolved.

Three-wire industrial plug

The structure of the 3-wire power plug
3-hole socket: “left zero/right fire/upper ground wire” (the ground wire is generally connected to the metal plate buried in the ground) as shown in the figure “3-wire plug and socket structure”. 3-wire plug: Electric appliances with metal casings are basically 3-wire plugs, corresponding to 3-hole sockets. The function of grounding: the middle plug of the 3-wire plug is connected to the metal shell of the electrical appliance. When plugged into a 3-hole socket, the metal case is connected to the ground.

Waterproof sockets in various countries

Correct wiring of 3-wire power plug
When installing the 3-wire plug by yourself, you can connect it as shown in the figure. Connect the power cord firmly to the plug. When wiring, it is necessary to distinguish which one (which color) is the phase wire (live wire), which one is the neutral wire (neutral wire) and the ground wire. The International Electrotechnical Commission stipulates that the yellow-green wire is the protective grounding wire (some Japanese and Western European products use a single green as the protective grounding wire). Use the white wire as the neutral wire (neutral wire), and the red wire as the phase wire.
The 3-wire socket is the 220V power socket of civilian household appliances. Its internal wiring method should be correctly wired according to international and national standards, that is, “left zero, right fire, and middle ground wire”. If the internal wiring of the 3-wire socket is wrong (which may occur during decoration or informal electrician installation), when the user plugs in the electrical equipment, it may not work normally. In severe cases, the electrical casing will be electrified, causing electric shock hazard.

waterproof socket

2-wire power plug
There are many people who do not pay enough attention to the ground wire of household appliances. For the convenience of use, only connect the electrical equipment to the power supply, or break off the end of the power plug with the grounding symbol, and then insert it into a two-hole socket. Washing machines, electric heaters, refrigerators, air conditioners and other household appliances are marked with a grounding symbol on the casing or power plug, which tells people that the electrical equipment should be grounded. Failure to operate as required is very dangerous! Because the grounding wire is usually connected to the shell of electrical equipment, when these electrical appliances leak electricity, most of the leakage current flows to the ground through this wire. And if a person accidentally touches the shell of the electrical equipment, if there is a grounding wire, only a small current flows into the human body, which plays a role in protecting the human body. If there is no ground wire, it will be very dangerous to the human body.

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