Solid core wire is directional. The late Bob Crump
Hmm. Well, ok, I'm willing to accept their empirical findings, even though pretty much everyone in that thread admitted that the phenomenon was unexplainable.
Bob,
I suspect that your bottom line about orienting from source to load is correct, in situations where it makes a difference, but I don't think that your explanation is applicable to a fuse. The fuse has no idea, so to speak, of which direction power is flowing. All it "knows" is that a current is oscillating back and forth through it, in alternate directions. It dissipates (converts into heat) an EXTREMELY small amount of power itself, equal to the square of the rms value of that current times its own very small internal resistance, but it has no way of "knowing" where the source is and where the load is.
Regards,
-- Al