From what i've seen of French cookers/stoves sold here they're wirable for either 230V or 400V. I think the way they actually work is to split the elements over different phases they're actually 230V but different parts of the cooker will be supplied by different phases sharing out the load.
Our hob for example came with a full 5-wire lead on it and if you're connecting it in Ireland to 220/230V you simply connect all of the lives together using a specially supplied junction box (3 X lives on a bus bar) to a single 220V live. So at the very most all it's doing is shifting each plate/group of plates to different phases.
