Delve no more! Sorry about the formatting, but below is the table from EN 60669-1of test current and conductor size for each current rating
Rated current A Test current A Nominal cross-sectional area of conductors mm2
1 1,5 0,5
2 3 0,75
4 5 1,0
6 8 1,5
10 13,5 2,5
16 20 4,0
20 25 4,0
25 32 6,0
32 38 10,0
40 46 16,0
45 51 16
50 57,5 16
63 75 25,0
Rated current A Test current A Nominal cross-sectional area of conductors mm2
1 1,5 0,5
2 3 0,75
4 5 1,0
6 8 1,5
10 13,5 2,5
16 20 4,0
20 25 4,0
25 32 6,0
32 38 10,0
40 46 16,0
45 51 16
50 57,5 16
63 75 25,0