Assuming it is a TT system it is dangerous, as others have said - all circuits need to be RCD protected in a TT system (it is very very difficult to achieve a low enough EFLI for an MCB to disconnect in time hence the reliance on RCDs).
How old is the CU, when was it installed and who installed it? Were they qualified? Do you have the relevent paperwork to go with it?
As RF says, a picture of the CU with the cover off will help too.
How old is the CU, when was it installed and who installed it? Were they qualified? Do you have the relevent paperwork to go with it?
As RF says, a picture of the CU with the cover off will help too.