3A fuse instead of 13A?

[dorsel]

Hello. I live in a new build house with a separate garage. The garage is connected to RCD in the house to a 16A circuit breaker. The cable from RCD leads to a 13A FCU and from there separately to a double socket and light switch. As it's radial circuit I was planning to add another socket off the existing one and add some lights. I noticed there is only a 3A fuse in the fuse box, should there be a 13A instead? I want to install tumble dryer in the garage and build a small workshop (no power hungry tools).

 

[westward10]

The 3A fuse is there to protect the current lighting. For additional power you connect from the non protected 3A fuse side.