Sorry about the hijacking of this thread, I do not normally rise to stupid comments and silly insults but as this is safety related and Jono appears to be encouraging a disregard for fuses and their ratings I feel obliged to step up to the table.
When you put you finger on a live part of an electrical system (during fault conditions) the current flows through your body down to earth and then straight back to the suppliers transformer (through the earth fault path)
The fault current then passes through the live conductor all the way back to the point of the fault, this circuit is called the fault path and its what generates your overload, which trips the MCB or blows the fuse.
Please take your time to read the link below, which clearly outlines the purpose of a fuse link
Fuses by the IET
I will not comment anymore on this subject.
PS Arc is not very good for thin materials, it tends to buckle it under the heat generated