What is the difference between a three-phase connection and a single-phase connection?

What is the difference between a three-phase connection and a single-phase connection?


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Answer: the three-phase connection contains three or four wires and distributes three voltages, the single-phase connection two wires and one voltage.

There are three-phase or single-phase electrical connections in all homes. The particularity of the three-phase system is to distribute three voltages (380 volts) of the same frequency out of phase with each other. The three-phase connection contains three or four wires, including three phase conductors and a neutral plug. Conversely, the single-phase system distributes only one voltage (230 volts). A single-phase connection therefore contains two wires, including a neutral wire and a phase conductor. Most homes use single-phase electrical connections for small electrical devices, the three-phase being rather dedicated to very high power devices such as electric boilers or large appliances (washing machine, electric oven, etc.).

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