Older houses have interesting wiring. I've even seen a 5A circuit (once) in a really old place, varnished cotton clad copper wire and other interesting stuff.
Also (in NL), a fire that had started in a junction box that somehow died out without becoming more serious. That was a pretty scary find in a house that I had just bought.
> Older houses have interesting wiring. I've even seen a 5A circuit (once) in a really old place, varnished cotton clad copper wire and other interesting stuff.
I've lived in a few older homes, and have experienced some of this firsthand. My current home has some of that wire with porcelain wire nuts in the older circuits. Previously we lived in an earlier place that still had a small amount of legacy knob-and-tube wiring. (Bare copper wire kept off joists with porcelain insulators of various sorts.)
Never had to deal with fuses, or sub-10A circuits. (But the utility of a 5A household circuit seems evident in an older world where the whole-house service might be 30 or 60A.)