On Wednesday, 31 January 2018 18:49:50 UTC, ARW wrote:
The one that gets me are garage CU's that come with a RCD main switch
and 16A MCB and a 6A MCB. Why not a 20A MCB and a 6A MCB?

European influence where they use 16A sockets?

You would
normally run a 20A radial for the sockets from such a CU.

And preferably not have the lights on the same RCD in an area where where machiney may be used

Owain