------------------
line           |                |            /  
------Fuse-----|   what hour    |--Fuse-----/ --------------
               |                |            |
               |     meter      |            | main switch
               |                |            |
neutral        |                |            /
------Fuse-----|                |--Fuse-----/ --------------
               |                |
               ------------------
                       |
                       |------------------------------earthing
                      _|_
                      |||