Which electrical term refers to a structure with all openings equipped with fire doors?

The term "fire-rated building" correctly refers to a structure designed to contain fire and prevent its spread, with features that include all openings being equipped with fire doors. These fire doors are critical safety components, as they help to compartmentalize a building and protect occupants while allowing for safe egress during a fire event.

By utilizing fire-rated materials and construction techniques, such buildings meet specific fire-resistance ratings, which are essential for compliance with safety regulations. This classification indicates that the structure has been built to a standard that enhances the safety of its occupants and minimizes property damage in case of fire.

Other terms presented may refer to different concepts. For instance, a "protected structure" could imply a building that is safeguarded against specific hazards but does not necessarily convey that it has all the features that a fire-rated building has. "Concealed structure" generally denotes areas that may not be readily accessible or visible, possibly complicating fire safety. A "standalone building" typically describes a structure separate from others but does not pertain to fire safety specifics. Therefore, "fire-rated building" is the most accurate descriptor in this context.