Why is there a 0.75 mm² size?

The other sizes are logical enough:

1.0 , 1.5 , 2.5 , 4.0, 6.0, 10, 16, 25.....

Each size is about 60% larger than the previous. It is just a mathematical series rounded off. The same series is used for fuse sizes and a lot of other things. (10, 13, 16, 20, 25, 32, 40, 50, 63, 80, 100A)

There shouldn't be a 0.75 mm² size: To fit the series it should either be 0.6 mm² or 1.0 mm².

Why not just drop it?

[This message has been edited by C-H (edited 07-25-2003).]