MOTM

I am hooking up a Power One supply and I plugged a three prong AC cable into 
the wall to measure what connector was hot and what was neutral. Just to double 
check, a short while later I plugged in another three prong AC cable to refresh 
my memory only to find hot and neutral swapped. I tried about 10 other three 
prong cables and it looks like I have just one where hot and neutral are 
swapped. I realize that perhaps this might not be overly important, but I've 
been assuming that the hot single would be fused. Are there no standards here 
at all?

-Elhardt