Vogele Basic Training Hydraulics & Electrics

E.11.0 Mains systems
E.11.1 Mains 230 V / 400 V AC
In 230 V / 400 V AC mains systems, it is important to
know the colours of the individual wires and to connect
these correctly. As a rule, there are three phases,
L1 (usually black), L2 (usually white) and L3 (usually
brown).
The blue wire is always the N (neutral conductor,
neutral wire).
The green / yellow wire is always the earth wire.
Example: Heater distribution box
Measuring between a phase and N yields a
measurement of approx. 230 V AC.
If the measurement is made between two phases,
the measurement is approx. 400 V AC.
230
Volt (AC)
L1 – N = approx. 230 V AC L1 – L2 = approx. 400 V AC
L2 – N = approx. 230 V AC L1 – L3 = approx. 400 V AC
L3 – N = approx. 230 V AC L2 – L3 = approx. 400 V AC
Example: Measurement between L1 - N