Rikkitic:
It is dangerous to make assumptions based only on your own experience. Our old farmhouse is fused (old-fashioned wire fuses) at 15 amps for powerpoint circuits. It is never a good idea to run a total load close to the fused maximum, especially in an old place like this. I certainly would not want to try maxing it out.
why? a 15amp fuse should be put in to protect the devices and wiring from failing before they fail.
if they would fail at 15amps then you need to install a smaller fuse. and that's half the problem with fuse wire is you can put what ever you like in there with out to much hassle.