All UL Listed receptacles, including hospital grade receptacles, must comply with applicable construction and performance requirements in UL 498, the Standard for Safety for Attachment Plugs and Receptacles.
In addition to complying with the general use receptacle Listing requirements, hospital grade receptacles incorporate
additional construction features and are subjected to additional performance requirements. These include grounding reliability, assembly integrity, strength and durability tests.
Hospital grade receptacles include the same markings that appear on general use receptacles, and also include “Hospital Grade” or “Hosp. Grade”, typically on the back of the receptacle where visible during installation. A Green Dot is provided on the receptacle face where it is visible after installation with a cover plate secured.