An arrangement is provided for alternatively providing a 3-phase or a 1-phase power stream. In an embodiment, the arrangement includes a 3-phase power source including a first, a second and a third power source output terminal; a switching section adapted to selectively provide, from the three power source output terminals of the 3-phase power source, either: a 3-phase power stream at three arrangement output terminals or a 1-phase power stream at two arrangement output terminals, different from the three arrangement output terminals.