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What are the functions of each of the three wires in a 3 pronged plug?
Wiki User
∙ 11y ago
One is connected to the line conductor (there is no 'positive' conductor in a.c. systems), and the others are connected to the neutral and protective (earth/ground) conductors. In simple terms, you can think of the line and neutral conductors as the 'supply' and 'return' conductors.
In North America, the line conductor has a nominal potential of 120 V with respect to the neutral; in Europe, the line conductor has a nominal potential of 230 V with respect to the neutral.
The protective (earth/ground) conductor provides a low-resistance path back to the distribution transformer, which will enable the circuit's protective device (fuse or circuit breaker), which is always connected in the supply's line conductor, to operate should the line conductor accidentally make contact with the appliance's metal enclosure. A broken neutral conductor will not cause current to drain to earth through the protective conductor; should this happen, the load will simply stop working.
Some equipment does not require the earth or ground conductor to be connected. These devices have additional insulation to prevent users being exposed to the line voltage.
Colors
In North America, the line conductor is black, neutral is white and earth is green.
In Europe, Live or line is brown, neutral is blue and earth is yellow and green.
Wiki User
∙ 11y ago
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