Thanks for reply.
Yes even the oldest of installations were 85A here in the UK. The more we use the more we pay.
But in Spain you contract for a certain rate (in this case 3.3 or 5.5 KW or 15 & 25 A). Then pay a charge which increases with the contracted rate. For a higher current I would have to pay the supplier for the cable and gear to be replaced and contract for a higher rate.
I did not realise it was a US board mainly because I confused ECN with ECA (Electrical contractors association).
However there may well be some well informed person who can give me an answer.
Thanks
Ted
