@Steven: maybe you need to look at this stuff a little differently, and (instead of looking for, and relying upon, equipment markings) teach your students to be able to work out "Class" for themselves.
We could also ask (especially in the context of the situation you describe):- does "Class" matter overly much anyway? When it comes to testing, and working on the kit, what practical difference does it make?
The time may well be better spent getting the guys au fait
with the electrical safety tester of choice (if any). Or better still (and the way I would approach things), getting them able to understand and carry out valid electrical safety tests without
an automatic EST - but rather using Common or Garden test equipment (Meggars, multimeters, and what-have-you) - plus (as has been mentioned a few times earlier in the thread) the importance of visual inspection (not to mention opening up the mains plug, checking for a decent earth, and the correct value of fuse).
Then get them used to carrying out EST on "everything* in the room" (ward, clinic, theatre, wherever) regardless of what Class it may be, or indeed "who else" might be "responsible" for it (no-one, if my own experiences are anything to go by). I would suggest that you need to instill in them the "Biomed Ethos", and the idea of the Biomed being the Custodian of Electrical Safety in the hospital. In other words (and as some may remember me saying many times in the past):- someone has to give a [censored]!
By the way, I am very familiar with the type of scenario you're faced with out there, and it's one of the reasons that I always advocate what we might call a "generic" approach to biomed work. Or if you like, a consistent
approach to PM etc.
regardless of manufacture (or indeed, what the manufacturer says - if anything; which may not really be applicable "out there" anyway). Let's be honest, the need is to get properly conducted PM etc.
up and running in the first place. The "niceties" (the minutiae
of electrical safety, and comparing risks to patients from this or that equipment, and all the rest) can always be developed later (if at all).
* Everything with a mains plug, that is.