Hi Paul..Happy New Year!
Yup..I'm a bit too technically curious..but I only did it for my apprentice students!
Hey, I took a look at the hair dryers and hydro-massagers..and they have ALCI's on their cord ends..not "immersion detectors"..but I don't know how the ALCI's work, perhaps they are immersion detectors in disguise. Instructions say that you have to unplug the unit before resetting the ALCI. 'Don't know if you HAVE TO or if its just a recommendation.
So, what part of the States are you interested in?