Radiomarelli RV109 scored

[enrico6v6]

Here in Italy actually mains voltage should be 230V 50Hz as European standard, resulting by the unification of continental 220V mains with UK 240V mains, but in many cases we still have the old 220V waiting the renewing of the transformers. Before 1970's there were a lot of different voltages in use depending of the energy providers, that usually were little local companies. 110, 125, 140, 160, 220 V were voltages in use, before television era in many zone mains frequency was 42 Hz instead of 50.
(Milan for example, 140V@42Hz)
Some zone still have 125V transformers and 230 V is obtained by two phases of 125, so there is not a neutral.