Actually, the length of the wire doesn't matter when determining the
proper
size fuse. It's not the resistance of the wire that's the issue, but
rather
the resistance per unit length (or, even more accurately, resistance per
unit surface area). This is because ultimately we're dealing with heat
dissipation as the factor governing what a wire can handle.

Wait a sec MZ. The length of a given wire WOULD effect voltage, right?
Longer runs cause larger losses of voltage. So, if you had a very long run
and your voltage dropped considerably, wouldn't you need more amperage to
maintain a given wattage (Ohm's law)? So, length of wire WOULD effect
amperage. Is my reasoning flawed?

MOSFET