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Power supply from large plants and high-voltage lines in the public grid are three-phase, and substations for the supply of the 25 kV/50 Hz grid can connect to either of the phases, and are actually connected to different phases on purpose so that there is a balanced load. In contrast, the 16.7 Hz railway supply system is single-phase.

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Wed Oct 3rd, 2012 at 04:25:13 AM EST
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