Pre-made electrical linear actuators likely include non-legal motors. They would have to be modified to operate with one or more of the legal motors listed in R32.
If you are using a lead screw, acme screw, or ball screw, without a motor, It should be legal provided you drive it with a legal motor and no other rules are violated.
NOTE: This is my interpretation of the rules and is not official. The only way to get an official answer is via the
Q&A system.