Thanks for the link! It looks like there's another important safety feature: the center of the output side of the transformers is connected to ground --> this

Thanks for the link! It looks like there's another important safety feature: the center of the output side of the transformers is connected to ground --> this means that you have two phases that both have only 55V to ground. I imagine that accidentally touching an exposed wire with a voltage difference of 55V is a lot less dangerous than 230V. I love HN. You learn new stuff every day.