1.5mm or 2.5mm wire?

The heavier cable will be more robust and perhaps more resistant to corrosion simply because there is more meat in it.
Fusing is an interesting question. If you compare witha car of say 20 years ago. I am not up to date on modern cars perhaps the same. The cable for the starter current is not fused. It is short and well supported to minimise chances of touching a negative. (body or engine of the car so much more susceptible). We don't often get electrical fires in cars considering the number of cars around.
All other cicrcuits are protected by a fuse (high current) then smaller fuses for low current small wires.
I have always wondered at the wisdom of individual fuses (circuit breakers) for individual items in a boat. The theory being that it if one device takes out it's fuse then only that system is affected.
I think likely hood of fuse failure is so remote and the ease of replacing that one fuse can cover a range of services. ie all lights on one fuse. Or in my case everything on one fuse.
This is pratical if you use heavier wire ie 15 amp rating with 15 amp fuse so the fuse can carry everythinng operating at once. Anyway that is my theory. good luck olewill
 
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