I'm not sure about the rules in other countries, but definitely here in Oz, there must be normally some externally accessible switch that will cut the power - in case of fire, etc. Usually the meter must be externally accessible too.

I do however have a friend that had a nutter acquaintance, who thought it funny to regularly pull out all her fuses. She checked, and had all the fuses replaced by circuit breakers, including the main, and as far as I know all of them were put on the inside of the wall, leaving only the meter on the outside.

I still say "ELCB".... :-)