If it were up to me, I would try to utilize
"defensive engineering" so as to mitigate
any liability that you can.
It would probably be best to devise your
label, and if the end consumer deems it
necessary they can add their labels and
inform the operators of your equipment
on the proper isolation procedure. Your
label protects you (designer) to a certain
extent if something catastrophic were to
bappen.
In these days liability problems come up
more frequently ( than in my opinion should )
So try to look at this as legal preventive
maintenance.
JR