Defintely 230/400Y, but "ungrounded" could mean both a TT system and a IT system. The former, which is the norm in France, has the neutral grounded at the transformer only and uses the soil as ground conductor. That is, the ground wire goes to an earth rod only. Requires an RCD/GFCI to work, but you shouldn't need to worry about that since it is on the incoming service.
If it is an IT system, it is a truly ungrounded system. Again, you will need an RCD, which again shouldn't be your problem. There is something you need to worry about and that is ensuring that your system can handle the higher fault voltage. In case of a fault somewhere (inside or outside your system), you can have 400V to ground in case of a second fault in your system. This will affect e.g. the selection of circuit breakers.
Although I find it unlikely that it is an IT (ungrounded) system, such are sometimes used in industries where you want to continue running equipment despite ground fault.
I recommend that you ask them if it is a TT, TN or IT system.
European conductor colours are being changed at the moment. If this isn't going in tomorrow, the best bet is the new colour code:
N - Light blue
PE - Green/Yellow
L1- Brown
L2- Black
L3- Grey
But if you use the old, no worry. It should be good until 2006.
[This message has been edited by C-H (edited 08-12-2003).]
