Most of the actuators I work on are 24v class 2. No need for disco.
I do not see the fact that it is class 2 as the determining factor.
Disconnect switches are not only to keep us from getting shocks but also to keep us from getting caught in moving parts.
Many 24 volt damper motors can provide enough torque to amputate a finger.
I would like to believe that raider1 has the answer with 422.31 (A) but I am really not sure.