This is important, because as you add more and more electronics to your circuit the breaker must increase in size. Some of these puppies have really small wires, and if you've upped the circuit breaker to cover all the items it powers, you could still have a fire.My "electronics" breaker powers up one of these :
ST Blade Fuse Block - 6 Circuits with Negative Bus and Cover - Blue Sea Systems
Then the individual items have a smaller fuse, each : chartplotter, NMEA 2000 network, MFD, etc. I still have some room for expansion, too.
Makes for much neater wiring than running each item back to the breaker box, separately.
Plus, if one device develops a fault, it won't take out everything.
While I prefer breakers there is nothing wrong with a fused panel instead. ABYC certainly has no issue with fuses.Well it's clear that there are lots of ways to wire it, but I prefer to follow best practice and ABYC rules.
Those best practices are :
Not to run wires directly to the battery.
Use at least 16 gauge tinned cable, preferably boat cable with an outer sheath.
The device should be connected to a re-settable breaker, not a fuse, sized to protect the wiring.
A fuse inline, as well, is acceptable and desirable.
Older boats weren't built with bad wiring, they get there one bodge at a time.