How is composed and what are the tension voltage of a supply electrical line?
The 3 phases electrical supply line at low tension are composed by three wires (conventionally marked with L1, L2, L3) with or without neutral wire. Neutral wires are connected to the centre of star connection of the generator or of the voltage transformer (low tension side). To have a single phase supply line it is possible to connect charges between two phases wires (for line without neutral wire) or between a phase and the neutral wires. The voltage between two main wires (L1-L2 or L2-L3 or L1-L3) is the line voltage (or network voltage). The voltage between a main wire and the neutral wire is named phase voltage.
