UL has announced a revision of the standard for access control system units. UL 294 can be purchased on the UL website.
“These requirements apply to the construction, performance, and operation of physical access control equipment and/or systems intended to regulate or control:
a) Entry into and/or exit from a controlled area, protected area or a restricted area or
b) Access to or the use of a device(s) by electrical, electronic or mechanical means.”
*Description from the UL website.