Switzerland seems to be the only country with ranges that use 400V elements connected phase to phase, more modern ones with a neutral supplied for control and lighting circuits. All others (except commercial models) are 230V only internally and can be used with any combination providing these. New ranges are supplied with a bunch of copper jumpers and the installer has to make sure they are connected to match the existing supply. These terminals are typically L1, L2, L3, N, N, PE and have to be jumpered according to the present supply. For example a 230/400V install would jumper terminals 4 and 5 and connect them to the neutral wire, the others to the corresponding phases. 230V single phase operation: jumper the aforementioned as well as 1, 2 and 3 connecting them to the phase wire, et cetera.
Something tells me that warranty claims on ranges in Switzerland might be a bit higher than the norm with connection options like that. We are lucky to get DIY's to provide a strain-relief, connector, bushing, etc. for final connections to appliances. I don't even want to think of the thousands of improperly grounded ranges and dryers that are out there due to their thinking "a ground is a neutral and a neutral is a ground".
