A 3-pin plug's wires The wiring is color coded as follows: Black Live Wire Neutral Wire Green is the color. Earth Wire is the color. The earth wire is on top of a normal 3-pin triangle plug and is usually bigger than the other two pins at the bottom. It's always a good idea to use metal connectors on cables containing conductive materials, such as copper or aluminum.
In this diagram, the black wire goes to the body of the light fixture, the white wire to the hot terminal, and the green wire to the neutral terminal. All three terminals on the socket are connected together. This means that if you were to remove one of the wires from the socket, the light would still work because all three terminals are now being fed through their own respective circuit paths. If any single wire was not removed then it would cause the light to go out because there would be no way for all three terminals to be connected to the power source at the same time.
The purpose of having three wires in a socket is so that if one conductor gets damaged then the other two will still provide power to the lamp until they too get replaced. The fact that most lights have three sockets indicates that they can handle up to three separate circuits without causing problems such as shorting out.
In conclusion, black = live, white = hot, green = neutral.
The plug is made up of three wires: live, neutral, and earth. The live (brown) and neutral (blue) wires of a plug are the two wires that make the full circuit with a domestic appliance. The earth wire (green and yellow) is added as a safety line and does not generally form part of the circuit.
A connector or lug is used to connect one or more wires to a device. A plug has holes in it for these lugs to go through. Each hole corresponds to a color—brown, blue, green, or yellow—of one of the plug's wires. When you're working with plugs and wires, don't forget about the fourth plug color: black. This is the cable shield or ground. It protects you from electrical shock by providing an alternative path for current to flow if any of the other colors are not present or damaged.
In America, Europe, and many other countries, power plugs have three round pins. The brown pin is the live wire; it should be firmly connected to a positive source of electricity. The blue pin is the neutral wire; it should be securely attached to a branch off of the hot conductor (not shown) on the back of the transformer. The white-or-gray-colored pin is the third pin, which is the earth wire. It should be connected to something conductive such as metal casing on a house wall or ground rod in the yard.
The third wire (black) is the earth wire. This wire should be connected to metal chassis of the device it's connecting to.
In US wiring, if you were to remove all the black tape from these wires they would be color-coded red/white/black. In other words, they are the same as any other set of home wiring; if one of them gets hot, they're both dead ends. But since they're supposed to be attached to a metal frame, we always connect them to each other first and then to the metal chassis through a ground fault interrupt (GFI) device or panel connector.
In Europe, these wires are usually white/gray/white. They should also be connected to metal parts of the device they're supplying power to but since there is no requirement for them to be connected together, this step is not necessary. If one of the wires gets hot, it's probably just a temporary problem with that particular appliance and not something more serious like an electrical leak.
Here in America, we tend to use lots of tape instead of color-coding our wiring.
The plug has three pins, however for double-insulated electrical products, only two of them are utilised! The Earth terminal is seen at the top of the image. This is where the green and yellow cables are connected (if there is one). They go to the Earth point or grounding block on your house wall.
The black wire goes to the Live pin. It should be attached to the metal shell of the product if it is an extension cord or other appliance such as a lamp. If the product does not have a metal casing, then it should be attached to another live source such as a metal box or a metal frame inside your house. Never attach any other type of conductor to the live pin - even if it is something as harmless as a piece of string!
The third pin gets connected to a neutral point. This is how electric circuits work: the black wire carries voltage from the power station all the way through your house to the earth point or ground, and this voltage is always equal in strength on both sides of the circuit. The white wire is supposed to be connected to the same pole of the power station as the black wire (hot wire), but in some cases they may come from different parts of the cable network. In this case, the white wire will usually be marked with red tape to indicate that it is not part of the hot line, but rather a separate conductor for a second circuit.