Re: Fusing to the size of the wire....
You're looking for the 'ampacity' of the various AWG ratings. Try this...
Wire-Gauge Ampacity - Transwiki
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"